HP 3467A (01) PDF MANUAL


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Title & Document Type: 3467A Logging Multimeter Operating and Service Manual
Manual Part Number: 03467-90000
Revision Date: March 1978
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OPERATING AND SERVICE MANUAL
LOGGING MULTIMETER
3467A
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HEWLETT tp PACKARD
1
OPERATING AND SERVICE MANUAL
3467A
LOGGING MULTIMETER
Serial Numbers 1821A00101 and ADDE
Revision A
IMPORTANT NOTICE
This loose lent manunt does not normally require a change site. All major change information lias been integrared into the manual by page revision. In eines where only minor changes are required, it change sheer may be supplied,
Ir the Serial Number of your instrument is lower than the one on this title page, the manunt contains revisions Diut do not apply to your instrument. Manual changes information given in the manual adapts it lo carlier in. struments,
al changes and delen (non a ele un set minute
Whiere practical, manual changes information is in tegrated into the text, parts list and schematic diagrams, Mamu) chanyes are denoted by a delta siun. An open John (1) or lettered delta (n)onn given page, refers to the corresponding backdating note on that pare. Manual changes not integrated into the manual ure denoted by il numbered della ) which refers to the Cresponding chan in the manual changes section (Section IX),
WARNING
To help minimize the possibility of electrical fire or shock hazurils, do not expose this instrument 10 ruin or <\'t'e'>$112 Moisture.
Manual Part No. 03467-90000 (Complete Manual Including Binder)
Microficlie Part No. 03467-90050
Copyrighi Hewlett-Packard Company 1978 P.O. Box 301, Loveland, Colorado, 80537 U.S.A.
Printed; March 1978
Ft
HEWLETT Packard
YA
1
SAFETY
This product has been resigned and testeu aturding in International Safor Me quirens. To ensure suferolion and 10) keep the product safe, the information, Will nions, and warnings in this momal must be hereder. Refer in Section 1lor general infor considerations applicable in this prosinci.
CERTIFICATION
Ilowloll-Purchard Company currifies i/ut ihis pro ' IN ils publisher specifications or the time of shipmen from olie fictory'. Hewler-Purkuri surilor certifies that its culibro rion measurements are truccable to ne United States National Bureau of Standards, no ille «Xot allowed by the Bureau's calibration durcilily, and in the enlibratim fucilities of her Imorialional Standards Organization members.
WARRANTY
This Hewigit-Packard product is warranted against defects in material and workmanship for a period of one year fron date of shipment, 'scept that in the case of certain components listed in Section l of this manual, the warranty shall be for the specified period. During the warranty period. Hewlett-Packard Company will, a les option, eller repair or replace products which prove to be detective
For warranty service or repair, this product must be returned toll service acility designated by-pr-. Ilowever, war ranty service for products installed by-lap- and certain other products designated by hip will be performed a buyer's facility at no charte within the lin-service travel aren, Ouiside-lip service travel areas, Warranty service will be pre formed a buyer's facility only non-up's prior agreement and Buyer shall pay lip's round trip Travel expenses,
.
for products returned to hip for warranty service, Buyer shall prepay shipping charges to whip-andlip-ball shipping churcs to retira the product to Buyer. However, Buyer shall pay all shipping charges, duties, and insen for products returned to hip- from another country,
LIMITATION OF WARRANTY
The foregoing warranty shall not apply :o) detects resulting from improper ur imdeunte maintenance by Buyer, Buyut-stopplied so ward or Interlacing, authorized modification or mistise, operation outside of thrownvironmental
povilications for the product, or improper sile preparation or maintenance.
NO. OTHER WARRANTY IS EXPRESSI:D OR IMPLIED. HE I:11-PACKARD SPECIFICALLY DISCLAIMS TII: IMPLIED WARRANTIES OF MERCHANTABILITY AND HITNI:SS FOR A PARTICULAR PURPOSE.
EXCLUSIVO REMI:DIES
TUE REMEDIIS PROVIDED TILREN ARI: BUYER'S SOLE AND EXCLUSIVE RI:NIE:DIES. HIT:WI:TI. PACKARD SHALI, NOT BE LIABLE FOR ANY DIRECT, INDIRI:CT, SPICIAL, INCIDENTAI., OR CONSE QUENTIAL DAMACILES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTIITRIDGAL THEORY.
ASSISTANCE
product maintenance ngrummis un orller (Womer (ISSÄStaice agremoil. Wie Wailable for llewWw-Puckurd muliers,
for any assister', comut pour leures !luwlen-Purhurd Sules and Service Ollie
denisses are provirkari wl the back of this numul.
11,378
717
SAFETY SUMMARY
The following goneral soloty procputions must be observed during all phases of tiperation, service, and repair of this Instrumont. Falluie to comply with these procautions or with specific warning elsewhere in this monual violato's safety standards of design, manufacture, and intended use of the instrument. Hewlett-Packard Company assuntos no linbility for the customer's failure to comply with those requirements.
GROUND THE INSTRUMENT. To minimize shock hozord, the instrument chossis and cobinet must be colinected to an olecrical ground. The instrument is equipped with a three.conductor ac power coble. The power cable must either be plugged into an approved three-contact electrical outlet or used with o three. contact to two-contact adapter with the grounding wire (groen) firmly connected to an electrical ground (safety ground) at the power outlet. The power jack and muting plug of the power cable meet Intornational Electrotechnical Commission (EC) sofety standards,
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE. Do not operate the instrument in the presence of flammable gases or fumes, Operation of any electrical Instruinunt in such an environment constitutes a uofinite nfety hazard.
've
KEEP AWAY FROM LIVE CIRCUITS. Operating personnel must not remove Instrument covers. Component replacenient and internal adjus:ments must be made by qualified maintenance personnel, Do not replace components with power cable connocted. Under certain conditions, dangerous volte sjos muy exist even with the power coble removed. To ovoid injuries, alwoys disconnect power and discharge circuits before touching them,
DO NOT SERVICE OR ADJUST ALONE. Do tiot attempt Internal service or adjustment unless another person, copablo of rendering first ald and resuscitation, is present.
DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT. Because of the danger of introducing additional ho.cords, do not install substitute parts or por form any unouthorized modification to the instrument. Return the instrument to a Hewlett. Packard Sales and Service Office for service and repair to ensure thot safety features are noin. toined.
DANGEROUS PROCEDURE WARNINGS,
Warnings, such as the example below, precede potentially dangerous procedures throughout this manual. Instructions contained in the warnings must be followed,
WARNING
Dangerous voltogos, capable of cousing death, are present in this instrument. Use ex. treme coution when handling, testing, and adjusting.
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General Definitions of Safety Symbols Used On Equipment
Instruction manual symlıl: the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect against damage to the instrument.
Inclientes dangerous voltuge (terminals fed from the Interior by voltage exceeding 1000 volts must be so marked).
OR
Protective conductor terminal. For protection against electrical shock in cose of a fault. Used with fiell wiring terminals to indi onto the terminal which must be connected to ground before I operating equipment,
Low-noise or noiseless, clean ground (unrth) terminal. Used forn,! siurn common), as well as proviiling protection agning electrical shock in ense of a fault. dterminni ninrked with this symbol must : he connected to found in the minner described in the installation (operating) manunt, and before operating the equipment,
TOR
l'rame ur elinssis terminal. A connection to the frame (chassis) of the quipment which normally includes all exposed metal struc tures,
Alternating current (power line).
Direct current (power line).
Alternating or direct current power line).
WARNING
The WARNING: slyn denotes a hazard. It calls attention to a pro cedure, practice, or the like, which, if not correctly performed or nelhered to), could result, personal injury,
CAUTION
The CAUTION sign denotes a hazard. It calls attention to an op trating procedure, practie, or the like, which is not correctly performed or adhered to, could result in camage to or destruction of purt or all of the product,
Model 3071
Table of Contents
TABLE GF CONTENTS
rri,...)
Swin
1. GINI:
RI INI ORMATION.,.... hal. trodd .... 1-3. Description....... 1.5. intim ...,,,, 1-7. Kangen.........
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iwis
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1:17. Switch Sultabile l'altre....... 1-18. Selectable (.1. Temperature
3.23
1:20. Selectable Dalla","10" Pinter
Omniter Clienation......... ...12 1.2. Spuiticiju ,,,..................1 12. Instrument d Nand
Identilianul,.,.,.,,..,,rrrrrrrr! 1-0, , OMS ,. rrrrrrrrrrrrrrrrrrr 1.28. Author'Supplier............1-5/1.0 1.,10), Acetsurie's Avilable....... Mw.1-5/1-11 1.2. Sutety consideration.... ........1-51100 1.3Subjun Inde......verore ... 15 -
50tm
3-57. Tema Resistante dal..............10 3-54). Uruute, ......................3-16 3,61), Temp Mein With Nath..., 1-16 1-012. DC Vollspelerstreme , ...........17 3.04. Produtute luluhanging).............17
-0,5. DCVWill Mar).................... 18 1.3.67. AC' Polk Alone..... ......IS 13.04. Proin (Au ging)............. 18 3.711, AO With Math............. ,,...);} 3.7.3. ResistaMUNICHINI...... ....!.-21 3.75. Docente (Nuorming)............21 3.76, hal Will Slithi... .*.78. Diwile Inving.
-SO!, Dunare ........ .-92. Sine Wol Merenu...........2
3.84. Procedure.
.........24 1.85. VIISI:D No Intl................25 3.87. ..............................20
.-S. Zeroing Alu 2012 01.01., ........20 } .4-11). Wat happens Wilken the Hunt
Cine Dow)......
...27
..........27 4.16. Opetune Chiechy.. ...........28 3.98, PO IS,,,,,
..28 -100, "Diply Toy"...,
1.3-2N ,1-102. "Printer len"..
24 .-)114. "Memors m o l Panel los......21) ..100. "Taction and Kanne Ties".,.,1.31.,
I-1198. *Digital lo"..............3.11.,1.,11 3-110, User's Indommation Cart.................
}
UTUP
Sertion
Maps 11. INSTALLATION ........
2-1. mirudlictiul........... 2.1. Initiatt inspection......... 2-5. Molter Keruienells, ....., 2.7. Powo Cinta Restplasten, ..., 2.). Citounding Requirement........... 2.12. Sunkirmesin! Resuirements, ..... 3-1.), Tonijuure..........core 2.14. Tunklity...orsmenorreostor 2:14. Instrumen Mounting..., 1:18. Rack Wounting, 2-21), Reptusine Papur....., 2-21. Repitchuping lur Shipment.
Birinin
I C
RITERII!
!
Sertim NII, OM:RATING INSTRUCTIONS......
3.1. inmoduction)....... 3.5. Süt ...... rosorrr.
o. Pult Routenica
iaper (heck........ .........2 .-12. Turn On Condition..................
-174. Display Lamiliarization...
17. Ile Lordin
Turciju ... 19-20), Ranking ,,....
21. Sulonging ......... 3.25. 1,17)...... .-27. Input Schutim, .. ,..
...5 ...30). Sean Seaking......
3.3.3. XY Wani...............
2. Mintet kimilitimation.........
...11 3-fill Printer Charlie Orientition.... .....12 3.5. Print Methods ............... ...-1.3 3.56 Temperature NerM en, ........8-1.5
Section
Page IV. III:ORY OF OPERATION................1
4.1. moduction.... ' . utlotional Deciprion...............1
POWI:R SUPPLY TUTORY 10. lower Suplies, ...... 1.9. Analog Supplies, .. 4.15. Digital Supplies........ .......
ANALOG TILORY 19, Sunnur.,,....
n itroeror.orrero ot-2.). "Scal" Sequencing..................5
25. The Ne t (cl, ...........6 1.26. 1. cum ersion Method...........17 25. We l'our deenen Intervals....,.0
5. Multiple contului..........., 7.,87, Volimeler................, 4-34). impul an Post Amplifiers H . AC Voltmeter...revermore
4. Ulumudur.......... +40. Omn Ganunt Suunat,
8 Ohm Comisiun..........., -51, Om Pruideliun.................11 *.55. Temperature Se n ..........12 14.00). ich...rrrrrrr...........,
Table of Contents
Nuest...071
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TABLE OF CONTENTS (Conti)
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1
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North
Hilde 18, 14.
40) nota d e ...........0.1 0.19. 110) Sual JUINDI 1.9
HO) 11/.......................... . :930), l'ull-Sirl WC Adjunt 19.01101
Jik) .......................00 2. Tull Sunil C AN IMI 1.4
20 hl ..., 11:22. I lliu l ') JUNI
".)1 ml 100 ml/..............6 lull Serie C JUNI 19.10
21 h ....................... 6.6 - How Drop Voltage W et
.8. li......... .............00 Sentjun
Dinge VII. RIPIACTABIL PARIS...............7.||
1.1. Introdu ........., ........7.1 7.1. Daluring Mountion.. 70. Von listesi linta....... 7. Mis Ches.......... 7.10), I Wuns c hlis...ii 7.12. Sulpitulo PAIS................?..
Sition
1:01. Impullid (101:2011.............19 -0.). Tr o r llybrid A4001).........1.1.
DIGITAL 1111ORI 5. Minutium ..................... 1.07. Isini Anel Abbesintiu...........11
av. Viim Muthia Huoni....... ...IS 4.7). Punset Boul.......... Li.... 6-73. Allophores......,
0 -80, RONIN........... ..... 1.8.3. 1/0) And Timing Bell......
...21 1.85, the input Diuin luteis,..... 1-87 the Law P et SCM .......
-'), lower Up Down Timing........ 1-95. Ill/'lime etc,............... 6-47. Volume Control I opk'.. .......... 1-0. Voltmeter Camal Chip WU).... 1.2.
101. Volimeler - Nicopol
! Imler littt.................... ... -104, Cock, .... 1.100. Display And Printa Cinem.......
6-107, Display Control (EDASI..... :1-112. Printer Conno ( 0) )........
1.114. Divplay Buitel.....
Lod. 27 -122. Top And Button Switch Busineb .....2 4.125.Pluto neboly..................28
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'-u.
1 TT
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Section V PRIORMIANO1: II:SIS.......
mrrrrrrr...] 5.1. Introduction..........................1 5.. Recommend aliyejmen........$.| 5.5. losting Multicha m ent,'.....? 5-7. Operation l'utilivilitol..............5.. 5.4), Pertum
..........iii....! 5.1). Continue Chak.................5..! 5.1.1. Toitluse Cariert WALLS
Tel.........................., 5-10, 1X Vulcler Autuh Isl..........5 5.1. AC VOICITARII ) lex.........6.00 5-24). In den let...........5-X 5.4. Ar Normal Sache Kejelion la...5.10
5.4. \ C omunione koje,sion .....11 : Sibh. Seine walition fent. ........5.1.1
SEVIIMI VISIRVIC..........ii.......... ......SI
S.J. J adu lt ......................! 8. Ilonal Swi Sudantims............! Xs. Selain CW I TIMP Luis...... 87. Suletin Mimer Chitilator
Origi D...................... 8.). Thenylpiju.................7 SI). Recen Surinam ..... SL. Iuli ,.,,..... NTS. The stille"................. 8-17. Memilih mombles ... NIS, Insti) ........
20. Impul lusim!................... 2.2. TuttoTVIVL ..................
2. Sinine Switches................. X , Supply Splitting........... .....8
. lip Sellisen lulub seal....) $ Imejeng Suites Tailures....... 8,8 modello The Dikililles.. 5 . Shum Ditly. Un .... ..1: 8.57; Display lent../.............. s... tot la ................ $71. Neno munt ' ..... 4.77. filt And Rape Best......... N . RUN' K.307* Dial Collerit.......
7.7777 77.777.
Sertion VI, VUSTNINIS...
01. Mo o n ......................! 03. Kuien ler..../... 1.5. Musie'll Selle.........0.1 0.7. Hyument Resmi................1 04-6). Alustonen Jumper Dan Doint
. L
...rrrrrrrrrr ........11.1 (1-11. Solenn Cil iun.... 01-1.. 7 Supply Adjustmem........ 0-14. Muut 7.XI) Adjustment....... ........ 0-15. Post Amp Zon
.. 0110.190,00) R USI, ....., 11-17. 10.00 VI SINI ....rer.
.......0.1
Surlioni IX. MANIPAL (TANGIS...................1
41. nu m ..................... !
APVIS
4. Suhler Imley
Nudel 34071
Tablo Colent
LIST OF ILLUSTRATIONS
Huurt i
Linie: 1,
-17
28RI
5
.
^
.
5.7.
..
Pirkt 2.1. Power Recipimetes.........
6-12. Ons Amel Temp configuration..........12 2.2.: stalling Thermal Panerio,
4.1.3. Ons Over ons Protection.............3 pont Panel Descriptio.
14. MIPU Archieviure............ 3.2. Line Voltage Switch Suiting.
1.13. Operating System Hlouchart......... 3.1. 0" Diyo mirorero,
410, Power Up Down Sequencing........... "01." Dim .rrrrrrrrrr
...... .17. Power-tail Suby Supply............ ,B5, Amaraming lyserts..... .............5 1-18. Volimeter Control al Block Dimorani...24 ..(1. 1: "" DATA" Printer Channel
..] }, 47, VJ JItf Ulttal Clip. - ... ... 4-35 Oiiemintion.........................12 4-20), Volume Control Chip Serial Omput .-7. "OL." in (30) A12 Riige). ........ .....15
Toin e n,.vermoorrrrrr.... .)-N Tempimte diensurements..., .......10 31. Latching Display Dalil.. ...............20 3.). DC Voluke Vestirements...., ......3-17
5.1.
Temperature Stuntment Actory Tin..., 3.10), Seisuring Regulation................
DC Volunteeruvurule, Test..............5.5 3.11. AC Voltage Mensurements,
5-). AC Volimeler Akvir) Test..............7 .-12. Determining Transformer Tun Rath....20
uhmmete Accuey Test.......... 1). Stage Guin Analysis...................... 5.5. AC' Normal Mode Rejesttun test......5-11 .!!!!, Resista Vesurements.......
5.0, AC Comun Node Reje.sion Test.........12 3.15, Dude Testing..........................24
Samner lotailun Test................. 14. MIX:) Mode Bierstents............1-25 0-1 Power-Drop Adjunct Test Point, .-7768 .3.17. Loering Tempemte Depaidency
7-1. livplocked View, Miscellaneous Harts.....7.14 Information on a Transistor Bius
Selecting CurFTINIP Unla...........81 Network...........................25 8.2. Selecting Printer (biancier Orientation.... 18. binlering lendirme als Reference, .........26
Printer Test Pan's...................8 3.14. Using and to liminal lad litur. ...3-26 . Changing The Print IDIODNI Resistori.1. .1.20). Self-Test Solunup, ...................... N-5. Remonine The l'rimler Assembly......... 3-1. Sample printer Test Results...........
Memory Ameront Panel Test ille ..22. Nemory and Pront Panel Test .........38)
No (umbinations)............. 18 ...
Sample Pmction and Kante TOS"
X-7. Junction All Rig lunt lonxe,........19 Results...irror...........11/.. 8.8. Tulementary Schematis, H-1 1-107A Black Diagram..........,irrm....I 8.), erromection Diyam.., ........1.8.10 1...: lostrument Management.................? 8-10). Analou Berrel, 9........., ...3/8-3 ... Deriving the 7 V Supply..................! 3.11. Procesor Bommel, 42........ .....6.1:8-10
SV Reference Supply.....
N.12. VO And Timing Board, A.........8-4,1/8-11 Input Senner Tunction Switching....5 8.1.1, lubentet (utol ngic, 14......,817/8-18 5-6), The Neustrenten (yule....... ........7 9-11. Display C arol, 10A5,0.......8.5),8-52 5-7, Aulu-Zero luopu V o n , ,....8 8-15. Printer Cumul. O AS, AP.......55/8-50
The Art-D) Concret Serlion........... 18 8-16. Front Home Sweet MOAT, *-* De Cinin Coulignations........ ........4
"O),(; 47.8................8.54/8.00) 1.10. AC Coin Continentan...... ..-..10) 8-17. Power Supplies 1/0 A1,1 .1..,8.(3/8.64
11 (10) Buch Din
ni..rrrrrrrrrr...,
. ......
LIST OF TABLES Tallic
Hipe Pole
PALE 1)
5.1. DC' Volimeter Aktury les limits.......5.61 ..),
Leite Resistance life ..................10 5.. AC Voltmeter Test Limils..............5.8 3-2. Chis Comariston........................19 5.5.: Ohmmeter Akturacy Test..............5.10 ...), Commonly used impedances and
6-1.' Recommended Adjustment liquipmeni....0.2 vociated in Kutere ........ 0-2.. 19.00) V--- Come dusement.........0.5 .3-4. 'N Junctions Charitulcriation..........
...3-23
7.1. Standard Abbreviations.......... 4.1. Junction Rely Drive (UI).
72. Cucle L.is Of Mantincturers......... #2 Salmer Kolny Drive(U2).. ..... Iro.ro
*-1.. LO Device Map And Mnemonic)..........3 Thermistor Resistance Versus Temporte
X-1-1. 10 Device Map Ant Mnemonies.........8 ture - N0)". To 150'................13 8-2. Recommend d Service liquipment........8-6
VIPU Internal conditions..............8 8.3. Interpreting Self-Test Iniluns..........8-10 5.1
Recommended Performance Test
St. 19 Roterence Designtur Alumnis..,8-20
8-5, R200' And R207* Mad Values......4-23/8-24 5.2. Temperature VeronICHI keturney
5.8.
...21
,72
Hi],
SECTION GENERAL INFORMATION
1.1. INTRODUCTION,
1-2 This section contains general Information concerning the I lewlett-Packard Model 3467A Logging Multimeter. Included are an instrument description, perilications, stip plemental characteristics, Instrument and manual identification, option and accessory descriptions, solety considerations, and some discussion on how to obtain further informa. tion on this versatile instrument
1.3. DESCRIPTION
1-4. The Hewlett-Packard Model 3467A is a versatile channel, tv ligil, function, print ing multimeter, The 34671 (referred to as LOGGING MULTIMETI:R) can be used for minual and/or automatic measurement logging on any combination of input channels. An mernal pacer-limer serves to initiate measurements and is presettable using the instruments manunl wiry lenture,
1.5. FUNCTIONS
1-6. The logging Multimeter functioris inelude DCV, ACV, OLINIS, and TEMPERATURE in both independent and mathi referenced modes. A uniqlo "WIX mode allows for temperature miçasurements on Channels 1 and 2, and DCV, ACV, or OHMS measurements on Channels 3 and t. Temperature measurements utilize an external thermistor of the following type:
Il. -lip- 0837-0167
b. YSI 44007
a fewal UUA 3551
'd. OMEGA VUA 3533
e, or equivalent 1.7. RANGES.
1-8. Ranging is automatic with a STEP pushbutton for up ranging and a HOLD pushbutton lor range holding. AV, pushbutton is provided for DCV and kl zeroing of up to 2 mV und 200 respectively on any input channel.
1.9. SCANNER
1-10. A four channel scanner multiplexes Inpuis one-at-11-time to the Loruine Muttimeler measurement cireuitry. All four input pairs are tTonting and scanning occurs in r: breuk. before-make scence.
Rek. A
dob
General Information
Model 3467A
1.11. PRINTER
1-12. A 16 Character/line thermal printer provides hard.copy of menuirement results and clapsed time, Printing can be both manually and timer muitiated. A roll of thermal papa provides approximately 5500 lines of printing (approximately 24 hours of continuous primi. ing).
1.17. SWITCHSELECTABLE FEATURES,
1.18. Solectable °C. OF Tomporoturo Units.
1-19. Temperature units are switch selectable between "Cor". The locuiny Mollimeter 15 shipped from the Instory with 'C ujits selected. Service trained personnel may refer lo Section VIII, "INTERNAL SWITCH SETTINGS" for information required to modify this,
1:20. Selectablo "Dotn" , "Text" Printer Character Orientation,
1-21. Primier character orientation is switch selectable between "DATA" or "TEXT" mode formnie,"DATA" mode printing is convenient for reading mesurement results from the printer without removing the inpe, TEXT" mode printing is convenient for performing long logging sequences with numerous measurements. The Logging Multimeter is shipped from the inclory with "DATA" printer character orientation selected, Reler lo Section III, "PRINTER CHARACTI:R ORIENTATION," for lurther explanation of the relative merits of "DATA" and "TEXT" Warneter orientations along with a sample of ench. Ser
vice trained personnel niny refer to Socrion VIII, "INTERNAL SWITCH SETTINOS" for I information required to modify the printer character orientation,
1:22. SPECIFICATIONS
1-23. Specifications are performante characteristics which are warranted. The specifica lions for the hipModul 34671 Logging Multimeter are listed in Table 1-1. These specillon llons provide the sandards or limits to which the Lorging Multimeter can be tested. Any changes in these specifications due to manufacturing changes, design, or traceability to the National Bureau of Standards will be covered in a manual change supplement or revised manual pages. These specilieations supercede any previously published,
1.24. INSTRUMENT AND MANUAL IDENTIFICATION,
1-25. Howe-jackard uses a two-section serial number. The first section (prelix) identifies a series of instruments. The last section (sulfix) identilles i particular instrument within the series. A letter between the prelix and the suffix identifies the couniry in which the insinti ment was manulmetured. The manual is kept up-to-date at all times by means of a change steel wliich is supplied with the manual. If the serial number of your instrument differs from die one on the title page of this mamal, refer to the change sheet supplied with the manual.
1.26, OPTIONS.
1-27, The options available for the Logging Multimeter are:
Optiua 908 Rack Flange Kit
• Option 910: Additional Operating and Service Manual
1-2
-.
-
..
Model 3467A
Cieneral Information
Table 1.1, Specifications.
.
.
DC VOLTMETER
OHMMETER
.
Runde
Range
Maximum Nuoding
Maximum Radi;
V " V 1 3400 V
Current Thmugh
Unkooki
Cuma
2007 V
11 fit
1147 1146177
1
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Cienernt information
Mode! 14671
Table 1.1. Specifications (Contd).
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FOUR-CHANNEL SCANNEN
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TEMPERATURE MEASUREMENT
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GENERAL INFORMATION Juoding Rate: Depwmson mutual lo ** 2 of!
in ver Operatim Temperatures Arctic Stomane Timppatore : 1.
without Dr Thermal Paper Storage Temperature: 10'6 to Bumidity: 5'1 BIL. +15°¢ + without
11. WI WIKI 150 to 30 with them . " Juon 100): 120 221 2.11)
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Cieneral (normalion
1:28. ACCESSORIES SUPPLIED.
1-29. The standard nciessories supplied with your longing Multimetr are:
• Thermal Printer Paper (I roll)
Thérnilsior (I)
Operating and Service Manual (1) . Operating Manual (1) . lixtender Boards (2)
• AC Power Cable (1)
Spare Channel Imput buses (2) Alternate Line Fuses (2)
i
SSORIES AVAILABLE.
1-31. The kwessories available for use with the logging Multimeter are:
ACCESSORY
wer.....
ORDER
-lip- 50361-20093 -lip. *HIGA
Bail Handle Kiti Rear Standort live and Power Cord
Wrap kit Rack Mounting Kit Additional Thermal Printer Paper (6 rulls) Additional Thermistors (1) Additional Operating & Service Manual (1) ruditiomul Operating Manual :
Additionnt Extender Board (1) Additional AC Power Cable (1) Additional Channel Input Fuse (1)
- p. 5061-(0)60 -lin- 820451 -lip- 4441.1A
lip (13467-4000 -1.)- 03467-4001 -hin. 5000-0019 - Ip- 8120-1348 -hip- 2110-0093
1.32. SAFETY CONSIDERATIONS.
1-3.3. The logging Multimeter is u solelyiklas I instrument (provided with a protective carth terminal). The instrument ond mamat should be reviewed for safety symbols and in structions before operation, is
11-34. SUBJECT INDEX.
1-35. This monual contains an alphubciierl subject index located in Appendix A. Refer to this index when information on a particular subject matter is desired.
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Model 34671
Installation
SECTION II INSTALLATION
2-1. INTRODUCTION.
2-2. This section contains information and instructions for the installation and shipping of the Logging Multimeter, Included are initial inspection procedures, power and grounding requirements, environmental information, instrument mounting information, thermal paper Installation Instructions, and instruction for repucking the instrument for shipment.
23. INITIAL INSPECTION,
2-4. This instrument was carefully inspected both mechanicolly and electrically before ship ment. It should be trec olmars or scratches and in rerlede electrical order upon receipt. The paper wall should contain a roll op-lip- thermal paper. Basic operation can be checked using the operator's chechs at the end of Section III. Il sliere is damage or deficiency, sce the warranty inside the front of this manual.
2.5. POWER REQUIREMENTS.
2-6, The Logging Multimeter requires a power source of 100, 120, 220, or 240 Vac, + 5% - 10%, 4810 440 Hz single phase. Power consumiption is less than 25 walls.
2-7. POWER CORDS AND RECEPTACLES,
2-8. Figure 2-1 illustrates the plug can configurations that are available to provide ac power to the Logging Multimeter. The-hn- purt number shown directly below each plug cap draw. ing is the part number for the power cord set equipped with the appropriate maling plug lor that receptacle. The appropriate power cord should be provided with each instrument. However, it different power cord set is required, noully the nearest -lip- Sales and Service Ollice and a replacement cord will be provided.
NOTE
Check locul electrical codes for proper plug (altachment cap) seless rion in your arca.
2-9. GROUNDING REQUIREMENT.
2-10. To proiect operating personnel, the National Electrical Manufacturers' Association (NF IA) recommends that the instrument cabinet be grounded, The -lip- Model 3467A Logging Multimeter is equipped with a three-conductor power cabk which, wlien plugged into an appropriate receptacle, grounds the instrument.
2-11. To preserve the protection reature when operating from a two-contact outlet, use a three-prong adaptor and connect the green pigtail on the adaptor to power line ground.
Installation
Modul 3.1071
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2-12. ENVIRONMENTAL REQUIREMENTS.
2.13. Temperatura,
Operating Temperature
0'c10+50°C (+32'PIO + 122'1)
Storage Temperature Without
Thermal Paper
-40°C 10 + 55°C (-40710 +1,31"}:)
-0°C 10 +30°C (-40°F 10 + 95"}-)
Stornle Temperature Wius
Thermal Paper
-10°C 10 * 30°C (-40°F to +95'1:)
Thermal Paper Storage
Temperature
2-14. Humidity
Humidily Without Thermal Paper
+15°C 10 +40*C @ 4500 RIT
Humidity With Thermal Paper
+15°C 10+30°C
009 RH
WARNING
To help minimine the possibility' of clectrical line' or shock lacurds, do not
c i his instrument to ruin or exces Moisture'.
2-15. Thermal Paper, To preserve and prolong your thermal paper, hvold expositre !!) 'N cessive humidity or heat, loncelone, ammonia or other organic compounds, or lo excessive direct suulliylit or arthlictul light sources, Store spare paper in a box or other appropriate con tainer, l'rinicdnpes from the louring Multimeter will last 30 days or more without inding it properly handled and stored,
2-2
+

--...-...-..-.-.
Model 3407A.
Installation
CAUTION
Use only Hewlett-Packard Iliermal paper with Pari Ninter 8204511 1o avoid damage lo the Lossing Multimeter primor (sembly.
2016. INSTRUMENT MOUNTING,
2-17. The Losing Mulumeter is shipped with plastic feet and tilt stand ready for use as it bench instrument. For additional in ormation regarding mounting Cressories, relor in the Hewlett-Packard unaloy,
2-10. Rack Mounting.
2-19, The Loggly Mullimeler enuinct is an -hip-system II mull-ruck width module and can be ruck-mounted using the muck-mount accessory (5001-0060) provided that suflicient rear support is available. Additional Information on rack mounting is provided with the mic cessory,
2-20. REPLACING PAPER.
To replace the paper roll in your Logging Mulumcler proceed as follows:
a. Open the paper well door and remove the empty core,
b. Berore inserting the new roll of paper inio the Logging Multimeter, discard the lirsi turn to ensure tlmt no glue, tape, or other foreign matter in on the imper.
6. Cut or fear the edge of the paper to provide a clean, smooth edge.
II wou
+
--
d. Temporarily place the paper roll inlo the paper well door and guide the lending edge of the paper into the slot at the rear top of the paper well. Reter to Figure 2-2 or the illustration on the inside of the paper well door.
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Figure 2-2. Installing Thernial Paper.
Depress the LINE switch to turn the logging Multimeter on, and press the PAPER ADV pushbutton until the leading edge of paper becomes visible beneath the clear plastie lear bur,
2-3
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T
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Operating Instructions,
Mode 34671
Installation
Model 3467A
1. Insert the roll of paper into the paper well and close the paper well door.
2:21. REPACKAGING FOR SHIPMENT
2-22, le following paragraphs contain a general guide for repackaging the Louring Multimeter for shipment. If you liave any questions, contact your nearest-ip-Sales and Ser. vice Office, Allri or-h»- Sales and Service Office locations is provided at the renr of this manul lor convenience.
NOTE:
i te instrumen is to be shipped to Ilower-Packard for service or repair, alluch a mug to the instron idlending the owner und indicating the service or repair ! complished. Include a sam ple of the logging Malimeler "Prinser Test" or other sample prin il printer service is required. Include the model number and Jull serial number of the instrument. in any corespondence, iden rify the instrument by model munher and full serial nmber.
2-23. Pince instrument in original container with appropriate packing material and sent withi strong tape or metal bands. Il original container is not available, one can be purchased from your nearest -hin. Sales and Service Office,
2-24. Il original container is not to be used, proceed as follows:
al. Wrap instrument in heavy paper or plastic before placing in an inner container.
b. Place packing material around all sides of Instrument and protect front panel with cardboard strips,
C', Place instrument und inner container in a heavy carton or wooden box and seal with strong inpe or metal bands.
2-
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Opening Instructly15
Model 34671
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DESCRIPTION
1 Line On/Oil Pushbutton.
Pirograph 3-8.
9 Channel 4 Math Rolerance Input
Paragraph 3-29.
2
10
Tinier Select Pushbutions.
Paragraph 3.50.
Inputs/Select Pushbuttons,
Paragraph 3-27
3 Poper Advonco Pushbutton.
Paragraph 2-20.
11 Moth Select Pushbuttons.
Porograph 3-33
4
Timer Stort Pushbutton.
Parograplı 3.50.
12 Function Select Pushbuttons.
Porograph 3-17.
5 Manual Print Pushbutton,
Purograph 3.49.
13 Ronge Pushbutions.
Porograph 3.20.
6
14
Thermal Prinţur.
Paragraph 3.43.
V,12 Pushbution,
Paragraph 3-26.
7 User's Intormotion Cord.
Parograph 3.110.
15 Multimeter Annunciators.
Paragraph 3-14.
16
8 Channels 1.3 Input Terminals.
Puragraph 3-27
Display
Porogtoph 3.14
Figure 3.1. Front Panel Description.
3.0
Model 3.1671
Operating Instructus
SECTION III OPERATING INSTRUCTIONS
3.1. INTRODUCTION.
3.2. This section contains instructions and hints for operating the Loung Multimet Operating procedures are discussed for selecting input channel 110king Temperature, DC Vullinge, AC Voltage, Olus, und Mixed Mode masurements; making stored and routime main rerere le measurements and performing aimer controlled measurement locuinu.
3-3. Before reudby the remainder of this section, l'
alliarize yoursell while the loving Multimeter frone panel controls as alicy appear in figure 3-1. The larging Multimeter in controlled by pushbuttons organized into function blocks". The limelionat blocks are:
function and Ranger controls including X Y Ainth) Inpuis/Seluri controls Printer controls (includinų timer)
3.4. A logical approach to operating the Longine Multimeter is to ask the following ques. lons:
- PUNCTION - RANGE
"What type of measurement is to be made?" "What range ol' values is expected?" "Is a direct nonsurement desired or is a minti operation necessary?** "How many different mensutrements are to be miadu?" *Is a record of the results necessary?"
-
X,Y NATUI
- INI'UTS/SELICT -- PRINTER
Once these questions have been answered within the capabilities of the Locuing Multimeter, front panel control ettings are delined. The resininder of this section is outlined to increase familiarity will ile unique logrmy Mullimeter features and their application.
3.5. SET UP.
3.6. Power Requirements,
3.7, Botone collecting lime power the Lorring Sulimiet, utily that the AG MORE
Ielie's the intunen poner l'equiries, Ill. vlame the nel lim Sulinge witches which are located above the line cured Ithach, I love witches in their appropriate things are shown in ligne,...
3-1
Operating Instructions
Model 3.671
I
on
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11.11.
Figure 3.2. Line Voltage Switch Sutting.
3.8. Alter verliying to the available source matches the long Multimeter voltage se img, connect the AC power cord and clepresytle I.INE" Switch. Tlie Lupying Multimeter is ready for use,
CAUTIONS
Failure in correctly wilah ile Logging' Multimeter's wimary voliage senting to the wilable source result in dominio ille Instrument
3.9. Popor Check
3-10), Il printed results are desired, check to be sure the paper will comenins suflicient hier mal paper. The paper replacement procedure is described in Sevilon 1. "INSTALLATION". One roll of thermal paper provides approximately 5500 lines (approx Imately 2 hours of continuous printing).
3-11. "Op Display, Altempting to print when there is no paper will produce an "0" Hisplay is shown in Figure 3.3. This display will occur onch time a primi in allumind by a Paper Advance, Manual Print, timui Pri:ht, or Sell Test
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Figure 3-3, "OP" Olsplay,
3.2
: Model 3467A
Operating Instructions
The printer will no run or
empt to print
at the therm
paper supply is replenished,
3.12Turn On Condition,
3-1.3. The Logging Multimeler Initin Turn-on condition with no pushbuttons selected is in Attornnging DCV; up to several seconds may be required for a display to appear. The display is the stored math refcruce which is 50 to +1.CXX)0 upon Turn-On, indicatul by the Y annunciator. Using and changing the stored math rerrence is described inter in this sec ton as part of "XY MATIT". The stored reference is always displayed in any function (cx cupt II:ST) when 110 liannels are selected or the blue Y pushbutton is deprissed. Select Chamel i lor the following descriptions,
3.14. DISPLAY FAMILIARIZATION.
3-15, Mensurement results are displayed on the live section L.DD rendout while current in Strumen lunction, Matlı Operations, and Scanner Status are anunciat d on the function ally grouped annunciators. The scanner status animuneintors indienia she channel displayed.
7A LOGGING MULTIMETER ETT PACKARD
--- FUNCTION
SCAN STATUSI
1.11
3-10, "OI.Display, The "OL." display shown in Figure 3-4 occurs when the Loguing Multimelor impul is overloaded or overranged. The positioning of the decimai point in Nimes what range was overloaded. This display will allow uceur when a math resuli exceeils
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Figure 3.4. "OL" Display,
3.17. THE LOGGING MULTIMETER FUNCTIONS,
3:18. The Logging Multimeler has lour basic measurement functlons, In addition, a com binational or Mix mode allows for simultaneous lemperature and DCV, ACV, or kn measurements. The non-treasurement "TEST" function includes a lour part operator's check routine and a circult exercise for use in servicing the Loving Multimeter
3-3
Opernting Instructions
Model 3:07A
3-19. The front panel Itinetion pushbuttons and their le are:
TEMA
FUNCTION--- - AV V hn
TEST
..
Hills
Tomiporotuto DC Voltage - AC Voltage Resistanco
"Mix Modo
If
HHH+ +
Sell-Test
3-20, RANGING
RANGE HOLD STEP
3-21. "The Loving Multimeter (mi be manually up-rmed ur ranneheld when the HOI.D pushbutton is seleciul (clepressed), Pressing the STEP pushbullon will then siep all channels selected lu the next higher range or turn over to the lowest rappellatrendy on Ilie highest ranke, Manuni runke control in this manner I NOT possible in the following conditions:
1. lor X: Y Mat Operations,
b. For TUMP function measuremenis.
e In the Alix mode,
The Logging Multimeter will alway's autorage lor these meistrements,
3.22. Autoranging.
3,23. in the alloranking mode, the loving Multimeler upranues at an absolute Koint of 1799. This produces an UTORINGING I/YSTERS/5, Hlguru 3-5 shows the aforanging points for DC voltage measurements. Autoringing in other logging Multimeter functions is sinilor
NOTE:
I
The prande und wirang poims muy vary in the KN and Imerions slepending on storoil offset vurdes,
:
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.
Modd34671
Operating Instructions
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Figuro 3.5. Autoronging Hystorsis.
3-24. LAN Range Memory, The Logging Multimelor remembers the last range on cicli chiam. nel and trys that mige lirst on subscqueni mensurements. Last range memory oueurs en when the shimmel has been desclected for one or more scon cycles, the Range pushbuttons operalt on all currently selected channels, Upranging with all channels selected will upranes all channels, Upranying with only one channel selected will uprange only that channel.
3.25. IV, 62 ZERO.
No
3.26. The Logging Mulimeter in pushbutton can be used 10 zero individual Channels with up lo 2 mV or DC orice or 200 or lend resistance, Whion in the ap proprinte om Vorkin Munction, offsets are subiraciud directly from (or added to) the measurements (helore math) and are retained after changing function to eliminate the need for zeroing channels again (providing they are not allered in the intermediate function). Instrument turn-on (main reset) seis channel xeroes lo 0.
NOTI
There is a separate correction factor which wulomatically compen Sales for herhal resistance,
3.27. INPUT SELECTION.
3-28. Any combination of the Loruiny Multimeier's four input channels may be selected via the inputs/Select pushbutions. Measurements are made in a step-and-mensure sequence and only one channel is closed at a time, AIL HI/LO lines are fuse protected 1 3/8 amperes,
3-29, Channel 4 can be used as the fourthi measurement channel with no mat selected, oras Die X: Y math reference channel with math selected. This means there is a maximum of 3 channels available with math.
3-5
.
---
----.....
Operating Instructions
Model J4671
VII RIMI...
INPUTS/SELECT ...
QC Q
360V PEAK 350V PEAK360V PEAK
2
LIII
CAUTION
To woi possibile lamage to the LORRIN Multimeter circuitry, the Input voltage Verween any two lerminals and herwcen any terminal 10) ground not exceerd 1 350 V IDC + peak /10).
.lilli
.
3:30. Scnn Soquonoing.
..
1-31, When the timer is oll, the Lugging Multimeier will soon the schuid channels in a 14-1- 2- ) Sequence and in a free running onlion. The scat, will skin channels which are not selected. The seren status annunciators iudiente the channel displayed a mny instant.
|
|
3-32. There is one exception to this, Wien using Chamel as the main reference measure ment, the sean status anmincintor will remain lil at all times as an indtention that this is nie math reference. The main reference is always annunciated by the Scan Saus "for "Y" annunciators when math is selected.
I
3:33. X:Y MATH.
Will Ill. i
3-34. The Loving Mluliimeier can perform math operations on channel measurements with respect to a measured () or stored (Y) reference by selecting the approprinte X: Y Mint) pushbutton. The Logging Muliimeter month operations and symbology are:
.
THT+
- X Y MATH
.
OFF
dB
510
****
**
O O OOOR
14
ENIN
3.6
3-7
- Result - Reference
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แune 2 input + 1), tit}tly (
twisd1:1 A *
limple:
111 111 1111111111111 (141( 111 112.141] กาแt.l11117 11 +1 (114 1151 11ttttisat1 18 ลบกุมน tits.sdt; v.1.1:11 11.1.
(4 "x)
"
11(
1.11st
118. 1d()
VLOH lopott
$110111011111111 1111111.300()
Modul 21671
The DIVIDE (RATIO) operation produces a monstrum result which is the division of the channel mensuenient by the reference,
Lixample: P. V Pimetion Channel 2 Input: Comunel Input:
10,000V 4.%)V
Primon:
+.290 21 + 2.0
09:00191
- Reference
liesult
20 logo
The DIICIDI:1. operation produces a mensurement result which Is the decibel level of the channel mensurement with respect to the reference,
Lexmmple:
TV Punction Cimmel 2 inpuls + 10,000V Channel : + 4.990V
1 2
4 .990 V .0402 UB 001CIBO
- Reference - Result
3-35, All math operations are performed with respect to a slored or measured Channel + reference value, There are four distinct methods for ubraining # Y reference value 115 Follows:
3-36. First Tum-01. Turning on thic Logging Multimeter mitalizes the stored YH reference value to +1.0000.
NOTE
Remember that "/"when performing A and Ana mail operations,
Ils), it is insert for BV mcusurements,
3-37, Secund: Renl-Time Referenciny, Selecting (depressing) the Channel # pushbutton esinblishes the current Channel mcusurement as the stored reference value. This value is updated each scan cycle when a new Channel 4 measurement is taken. The "*" Scan status annunciator remains it when real-time referencing, The Y reference measurement is not displayed but is primed along with the measurement results. The X Y MATI «xamples show real-time referenced mathi.
3-38. Third: Measured Reference, Deselecting releusing) the Clunnet ut pushbutton establisfies the ful Channel measurement as the stored reference value, The "t" scam status annunclator will extinguish and they scan status anhuncutor will remain lit, In dienting the muth reference is now a slored value.
3-8
Model 31671
Operating Instructions
3-39, Buurthe Manilly butered Reference, the stored reference yalile may be manually allered in an appropriile function and mange by depressing the blue Y puslibulion. This displays the previous stored reference value or "CH II Channel is currently selected, (Chnunelt is the reference in this case, it must be dusclected It continue will manual cury), This also converts the reminuing XIY Math puslibullons to momentary contact s'viteles which can be used to stop the display digiis to the desired value, Pushbullons are dedicated lo digits and the decimal point location necording to the blue characters undermentl). These quence lollowed by such pushbution is:
...... ------que.. -- XY MATH--- OFTA
STO
ON 11
SH
701131
410101111110
21
ENL
.
I
.
I
-
i
.
LL
.
L
.
Wit
ه
-
-
- د
- 1
2
2
2
R
*
blando tu
-
ب
ن
5
5
ا و

-
م
Cava
= =
- ร
.
-
=
- M ontcmplynum LIMW
N IKI met pret
Planty penent a TEMPY,
Alam --- V only
3-40. The baste procedure for entering n manli reference is to:
it, tanier the manual entry mode - Remember lo deselesi Channel 11
b. Select the approprinte logging Multimeter Munction,
6. Step the display to the desired matli reference value and range.
d. Store the reference by lenving the manual entry mode
Rev.A
3.4
Operating listructions
Mode) ,1.1071
3.-oil. Here are a low pointers concerning manually entering moth references:
Hirst
the
"X " mode math is possibile un Chamel somly, since Chanell rolerance and only Channel 3 has the same iniis,
Second
ully entering i reference, the
If Chali inadvertently selected after
m entered reference will be lost,
Thirdi
Rulerendes remain vid unill unted loy any of the lour ichid described here,
411110:1
Stored temperature references are not converted when the degrees selection is changed,
biftli
keep in mind lint imath results are normalized I 1 IV, or I kn. Uwie mit approprinie range when wering relorences to yold luss of resolution on the Neisurenet result, Choose a ranye which results in > 1, IV, or I kn measurement results,
EXAMPIL: Mulliply Channel 2 Mleasurements by 1.500)
V lunction * XY Mathi Channel 2 Input: 12.3.15 my
DISPLAY ANNUNC. INTOR ON
INCORRICT
Suured y Reference
(XIOS'I +
Printou: YP
1.500 MY
10100100
LUSS or result time lomVon V multipliention and IV normaliail
llon
BETTER
Storud Y Reference
+1.501))
Printout: yy 11.5040
V
101701gu
Loss or resolution in result dare lo mv.V multiplication and IV hor mialization
3.10
Mladiel 3467A
Operating lystructions
DEST
Slored Y Reference:
+ 1500)
Y
Printomi Yt + 1500.
2: +19,51
001JI10
V
-
Correct results to 3 decithal places. mV units interred.
Sixth
-
The polarity sun is ignored for manually entered references in the - V MMC ton, Only maxnimes are considered.
3:42. PRINTER FAMILIARIZATION,
TY
-
33. The thermal printer may be used to print manually or timer ini. iluted measurement results, The printer format is shipped from the fue Tory will "DATA" orientation as follows:
SEC
E PRINTER MIN X3
XG
XIO
üb ööö
TIMER -
PAPER ADY
MAN PRINT
START
P
untero
IR: PXXXXXXUUU 13: " X X X X X X UUU 12: P XXXX X X UUU I P XXX XXX UUU
H H M M: SS
Where HH = Hours elapsed
MMK - Minutes clapsed
Seconds clapsed
E manual print
Indicutor or blank for time!
print RE Hi Channel +
or Y: stored reference P = Blank
or.
or it XXXXXX : Measurement result
with decimal point UUU Three character
math and units Iuld
3-1!
Operating Instructions
Model 307A
3.44. Printer Charactor Orientation,
3-45, "DATA" orientation is convenient for reading measurement results from the prinier withion removing the tape since chiructers are printed right side-up. This format is assumed Iliroughout all Illustrations in this manual unless otherwise specified, 3-46. "TEXT" orientation is an alternate format for the Logging Multimeter printer. This orientation is:
HH:MM: SS 11: " X X X X X X UUU 12: P XXX XXX UUU 13; P X X X X X X UUU IR: P X X X X X X UUU
where the characters represent the same information as in the "DATA" mode. "TEX:"" orientation is convenient for performing long logging sequences with numerous measurements, since the resulting tape is in chronological 1-2-3-4 order okurumu.ed Irom the printer.
i 3-7. Decide upon a desired forn a briore beginning a louring sequence with the Loreing
Multimeter. Figure 3-u shows an actual sample of both "DATA" and "TEXT" mot prin i ting. Service trained personnel my reler lo the procedure for changing the primer cureter
orientation in Section VIII, "INTERNAL SWITCH SETTINGS". Notice that Chamel measurement results are printed last, although this channel is measured first in the schein quence,
"DATA" Example
"TEXT" Exomple
DY
1649)
Ito
OA
Topus move
41 +1.6793 kg 3: +1.6939 KQ 21 +1,6830 kn 1+1.6995 KO
00:00:16 Hi +1.6792 ka 31 +1.6940 KO 2: +1.6930 KO T: +1.6833 KO
00:00:01
3: +1.6941 KQ 2: +1.6882 KO
KA
11 +1.6872
00:00:18 4: +1.6799 KO
KO
Z: +1.69"
hO
2+1.686. 11 +1.6671 KB
99130:05
+
to G GT
+
.
+
Figure 3.6. "TEXT" VS "DATA" Printer Character Orientation.
3-12
-
Model 34671
Operating Instructions
3:40. Print Methods.
3-4), Maunt Print, l'essin ile "MAN PRINT" pushbution C:11:50s the printer to print a blank line followed by measurement results from the currently selected channels. Mensure ment results printed due to a Danimal print are ndiented by at lundimy " "charcier, A M ul print does nojalleci Ulemier, but dues print onpsed time Ilille timer is oll even
when in Channels are currently selected,
3-50). Timed Print. l'imer intervals of 1 second to 3 hours can be selecicd vin ide timer pushbuttons. The actual maximum measurement rate depenas on the number of channels, the function, and the amount of ranging to and scale of each measureinent. In some cases Nie selected time interval may be shorter than the:Ime required to completely measure all the Selected chamels. In this case the Loguine Multimeter mesures as fast as the above cond llons allow, Selecting a new ime interval does not modiiy impsed time which is printed along with channel measurement results, Belveel sean cycles the logging ulimeter ellers kl "WAIT" inte during which the WAIT annunciator is lit. During "WAIT" the Lorging Mulrimeter will monitor the lirst channel in the NCO) Neylence. Channel 4 Is skipped in.X:Y math is selected, Aimed print with no channels selected only prints clapsed lite rund the Y stored reference ir Xiy math is used.
Example Tliner intervals
10 Seconds
1 CH
SIC
NIIV
30 Minutes
SEC
MIN
cu
| Secondi (Ietault)
3-51. The timer may be preset by using the manual entry feature of'l!18 Lugging Multimeter, Turning on the timer while in manu enery Murpis the displayed value as the limer preset and starts the timer. The most siunilicant digit display ( 1) and all decimal points alte ig nored when entering the iimer preset. The lort is:
XIII MM
Where X - Ignored overrange dicit
HH = Hours digits (MOD 24) MM = Minutos digits (MOD 60) with carry)
The lours digits are NIOD 24 meaning that 31 is subtracted from them upon storage unila number from Olo 23 is reached ,nd taken as the hours preset, The minutes digits are MOD 60 with a carry into hours (example: 02300 presets the timer to 00:00:00). It is best just lo always enter the hours ind minutes in a conventional manner. Presenting the timer destroy's the previous matl: reference vabata, substituig instead the timer preset value. The manually entered reference must be re-iltered aner presenting the timer,
Rey, A
...
Operating Instructions
Model 3467A
Example: Lop the change in de voltage or some poin, or points from a reference voltage (sily + 25V) und preset the timer 1o 12:34. The procedure for this is:
linter ile mnun entry mode.
Select the desired function.
7 461A LOXOTG Malti
HOT TALNO
Step the display to the desired timer presct us Ing the X:Y math pushbuttons.
NOTE
-
--
..
-.
-
..v
.
VI
-
USTA.)
IGNATED
The least significam digit cumor de incremented while in ille TEMP Suction,
Turn the timer on lo) accept the entered preset and start the timer.
Suurt
ETA IOGGIT,
TTC AND
IL FINE TEH
+
Step the display to the desired math reference using the X:Y Math pushbutions. This must be done even if the desired reference is 1.0XX00 since presenting the timer made it 1.2.34
1
1.) † 25.00
th - ,..
! }
-
-
-
-
-
-
-
-
-
Store the displayed value at the entered reference by relensing the Y pushbutton.
g. Select s math, the desired timier interval, and impul selections (1, 2. or 3 only).
NOTE
fuilure to re-enter ille desired math noforence after pr
I minute intervals (no channels)
(10:02:00
-
00:02:32 00:03:00
Power line Interrupted Arhiis elapsed time Louying continues
3-93. Turning the logging Multimeter line switch off will discharge the low-post memory relention power supply and upon turn-on reset the stored matli constant, references, and timer preser. Removing the line voltage in any other manor (line cord, master switch, dle.) will result in memory retention.
3.94. TEST.
- FUNCTION EV V kn
TEMP
TEST
15
3-45. The Logginy Multimeter TEST Cimetion can be used to perform any combination or 5 Self-Test routines, The Sull-Testing capability is divided into a four-pari operator's check and one servicing aid. Selecting the TEST pushbutton pinces the Logging Multimeter in the lest mode defined by the positioning of the "IN PUTS/SUI.LCI" pushbutic as in Huure 3-20.
3-27
IN
Operating Instructions
Madet 34671
THUIS/SILIC
..
t
Qi Q10
.
.
t'le it
is
1
GI
b- .- (
PALOMill. il., 11011CH,
(Splitu. HE
Figure 3-20. Self-Test Selections,
3.96. Operator's Checks.
3-97. The four pait onerulur's, chick portion of SEIKTIST is convenient method of veri lying the basic operational capability of the Loruine Muliiniciar as part of an incoming in spection or operator's check. Although this check will produce a high confidence level that the Loguing Multimeter is basically functioning properly, it should not be tied as any in dication that the instrument medis published specifications. Users who desire to test the Logging Multimeter against speellicoliosis sliould complete the performance tests given in Section V, "PERFORMANCE TESTS", Interpretiuni in operational critication Failure is discussed in detail in Section VIII where Sell Test resulle 'I por siderable insiyits into the maitre ind unuses of logging Multimeter mallustions.
3.98. Procedure.
Test
3-99. Depress the test pushbutton to enter the Sell Testinctio. The Inpuis/Select pushbutions can then be set to perform the desired lot or less. The following pragraplis describe ench test,
3-100. "Display Tost".
. 1
1 2
1 3
2 4
3-10). This test begins with an initial 'dISP"display. The display will then allernie twice from all display segments and annuncluirs "ON" (4 seconds) to all display scenients and annunciators "OIP" (2 seconds). You should scrutinize the display for missing scymerits or annunclaints,
3-28
Model 3467A
Operating Instructions
3-102. "Printer Tost"
3-103. This test will print the Louny Multimeters character sc, 'Ille print should resenibile one of those illustrated in ligure 3-21. Check the primi lor such things als
al. Consisteni lime lengti, b. Consistent line spacing, c. Correct line position. d. Presence of dois.
NOTE:
...
---
Wake sure the Blue Y pushbutton is Hot Selected for this lost or the printer will not print,
"DATA Orlenintion
"TEXT" Orientation
MUD%CFOL
- DVYNK 0123456789
70-3.970P**
WIU - 682967€ZIO
Figuro 3.21, Samplo "Printer Tost" Rusulis.
3.104. "Memory and Front Panel Tost"
3-105. This lost will display an allentson-Letting "17" ll the low-power memory is operating properly and a "Lr II non. Aller that, a unique anunciater display will occur
Ach of the logging Multimeter pushbutions that you press. You can compare the display you receive to those shown in Figure 3-22 lor cich pushbutton.
3.24
Operating
siructions
Model 3:07A
Stork
PUSH TO SELECT PUSHBUTTONS Pushbution Annuncilors
SEC
MOMENTARY CONTACT FUSHBUTTONS
Pushbutton Annunciators
PAPER ADV
2,4
NIN
MANT PRINT
MY
mv
3,4 lignoro 1 & 21
XG
SIE
1,2,4
X10
1,2,3
KI)
1,2
KOLO
Voit
30.1.2
ENT
Louve Solected for Momentarius
-.,1,3
UB
48,2.3
-End
u.
L-
S
--
-
-
.
.-
-
-
Figuru 3.22. Memory and Front Panc: Tost,
3-30
Model 3.67A
Operating Instructions
3,100. "Function and nongo Tost".
3-107. This last will stop the digital sectiil of the luguing Multimeter tironuh wory villa mange in the V, -V, and a fun will, the prinier generales o print similar a ONU those in Ruure 3:23. Check the prime lor such things as:
1. The corrust functions, b. The current mines,
NOTI
If the wet pushbuton is rlepnusserl, ruging is displayed but ne
Manted.
"DATA" Orlonintion
"TEXT" Orlantation
9000
W
41 +00.00
+ 0.000
3cccccccc
0000th 8000 h 8000 000'8 + the 3000 0008 0000
-
OS
y 08.0 MV !0.900 MO
+ 000. O + 10.00 kn
+ 7.300 KO #7 + 0300 ko
0.00 0
OH 2000 t OM 9.000 Uy Q000 to 0 000 h 090000' + ih U 000J + itt
Figure 3:23. Samplo "Function and Range Tast" husults,
3-10B. "Digital Test".
!
!
1
2
3
!
3-104, This is the front panel entry method to the Signa l ysis (S-1) routines. These routies are useful as service nids for the locking Multimeter, Usur Digital Testos by wr. vice trnined personnel is de ribed in detail in Section VIII, "SERVICI", the 1071 OPIRATING AND SERVICE MANUAI..
3.110. USER'S INFORMATION CARD.
3-111. Auser's information circe is provided at the bottom of the laring Multimeter runt panel. This card is easily accessed and contains al summary of operating information in characteristics when quick information is needed.
Rev.A
3..
...
SECTION IV THEORY OF OPERATION
I willi Li
4.1. INTRODUCTION
1-2. Ibis section contains the Theory of Operation for the longing Multimeter. A line tional description of the Louny Multimeler is followed by lower Supply Theory toy supya wy), Amoy Theory (by function), and Digital 'l'heory (hy hourd). Intorn 11on on the input Hybrid (AU201) and interntor Hybrid (AQU601) is presented with the Annoy Theory. Il formation on the Volimeler Cumirol Chip (AHUI) and Microprocessor (1 201) in presented in the D in Theory,
Jhil
.
4.3. FUNCTIONAL DESCRIPTION,
l
.-
f. The Loguing Multimeter milies a pour channel reed relny seuner to muliplex input signals to the analog portion of the instrument. The analog front and is a signal conversion and processing block thui lumerions as a guin programmable input-To-DC converter. The
non-to-digital cojinerier employs a Dunl-Slope Iniceration process to convert the DC voling!!!o dlulta in urmation. All the heart of the instrument is an 8-bit Microprocessor (MPU), whidli, llorough a resident control program, circus ille selection of impalerminals, Range, and Function; and supervises the display, ithio and annunciation outputs. The con. Trol ROM XOSO contains the instrument Self-Test (wcluding Sigmune mlysis, SA) and mnih routines. A generalized instrument block diagram is shown in ligure.l.
.1
-ULUI.
1
'H
'A
'.
+
;
|
!-4...
!
Figure 4.1, 3467A Block Diagram.
! !
ue li
Resi
1
Y
TL
-
2
--
11EGRATOR OUTPUT - OURING MEASUREMENT CYCLE
KEY POINTS
MUID
UIG
;
littu
til N-U19
HOLD
Jiu-DONT
0-70X)r ]

IU
-
INSTRUMENT RESET AND INSTALIZE
ON
-
++
DC 120ny AND 700r.)
ACY IONER RANGES) > ACY
Owws TOM
START OF OPERATING SYSTEM

DCTERINC FUNCTION, RANGE. EIC CLOSE PROPER CHANNEL IF SELECTED
STAR! OF MEASUREMENT CYCLE
AUTO-ZERO INTERVAL
TAC
+DCY 101HER RANGCGI -DCV 1200V AND 200mVI
Ruti-UP INTERVAL
HOLD (POLARITY DETECT INTERVAL
FIXIC Wt | into the - Irori - --- ICOM--D
INPUT
imo
RUN-001N INTERVAL
-
-
-
-
-
-
-
- .
-
- -
-
-
.
.
-
-.
DIGI LATCHING
DATA TRANSER
TRIAL TRANSFER
LSD,
START OF OATA TRANSFER COUNTER CLOCK'S DISALLED
CCNPARATOR -
L50 DATA LAICHED NSOS COUNTERS ISOLATED
CLOCK DISABLE
------------
m
--
---
CLOC,
j ENABLED AGAIN
LSD TRANSFER
K-
O.
-
'SO DATA TRANSFERRED TO BUFFER ANO SERIALLY OUTPUT NEW FUNCTION AND RANCE. CON, HOL LSO OATA OUTPUT
11!
LSD CLOCK LOOKIMI
ST
MEASUREMENT CALCULATIONS AND
INTERNAL DEVICE MANAGEMENT
rum
NSD'S CLOCK [Okt
4 PTH+mor +
MICROPROCESSOR INSTRUMENT MANAGEMENT
ROUTINES
-
UPDATE
PPIMI
SCAN
FOR CHANNEL
INITIA IZE+ INSTRUMENTI
1
MICROPROCESSOR INSTRUYENT MANAGEMENT ROUTINES
PERFORM
IF
--DSPLAY FESUL! NECESSAKY A
TAKE READING
FERFORM - OFFSET CALCULATIONS
line movie
CHECK FOR UEFL Cap
STATUS
-
-
2-
**NECESSARY
ELASPEO PIME
1 - 2 - 3 -
I
NOT" I
"STAT
"STAT" I
"SCAN"
"SCAN"
I
"READ"
|
"OFFS"
I
"OVER"
I "MATA" I
"DISP.
I
ENT
34671-27
SELF-EST PERFORNED HERE, RETURNS TO O
-OR WAHUAL ENTRY REQUESTED. JUMPS TO "ENT"
Figuta.. Instrument Manauement,
4.2 Rey, A
in
l.
Muse! 34074
Theuty: 0 Operation
1-5. ure -2 divides the logeing Multimeter control process into separate Alivroprocesor directed instrument management routines, Notice that liese romines com bine lojroduce the instrument's Operating System, which is responsible for all the control processc's previously mentioned. lollulll and refer to this ligure as necessary tliroughout the runwinder of this section to relnie information on imis management routine level
POWER SUPPLY THEORY
4.0. POWER SUPPLIES,
1.7. The Login Multimeter power supplies are located on ile A9 Annoy Bourd and Illu Al Digital Moller Board, We shall refer to the A9 supplies as Inalog Supplies and ile Al Supplies ira Digital Supplies through this mamal.
4.0. Anolog Suppllus,
1.). Secondary voltage from lime Transformer Tils Pull-wave rectified by CR903hirongi CR906 arranged as a bridze. Pliering by C902-trougli-0905 provides | 12 voli
regulated supplies al approximately 55 m2,
-10), it 7 Volt Supply, The +12 V unregulated voliage is used as a soline for the + 7 voll precision regulator, U900. The output of U900(6) is adjustable by changing the reference sample vin R917. Lowering the resistance or R917 raise the output voltage, R910 provides current limiting al approximately 55 m. This supply is used by all other power supplies,
4-11, -7 Voli Supply. The7 V regulated supply is the reference for this supply and the .12 V unregulated voluge is the source, U901 is configured as at .XI inverting amplifier to derive the - 7 voll output from the + 7 volt input, Q902 is the current driver which is led by Ilie-12 V source supply. Higure 13 a simplified Illustration of the -7 V supply derivation,
4.12. -2,05 Volt Supply. This supply is volinee divided froin ile-7 V supply by R91 and 1915. It supplies the backgme blus voltage is the input diybrid (A9U201), the Integrator Ilyorld (A9U401, and the Voltmeter Control Chip (AHUI).
14"
Figure 4-3. Variving The -7 V Supply.
TOD!!!
In
li
i
Theory of Operation
Model 3071
#-13. +5 Y Reference Supply. The +5 V reference supply is a precision zeher regulated power supply, CR500 is the +9,95 reference zener which is volinye divided by Rin and R516 in the feedback path of operation ampliler U50X). This is shown in Figure 1-4. The ON AMP is a high open-loop gain, low oupa impedance amplilier which efterlively reduces variations in the vollge divided ollpul dite to londing. The result is a highly stable low oui. put Impedance reference.
4.1.4. The course R adjustment is done all the factory and unless the reference rener (CR500)) Is replaced. R502 will be sufficient to adjust the relirence supply, The 15 V reference supply adjustment is described in detail in Section V, ADJUSTMENTS".
iii iii
I.
}
4-
1iIf
20..
iii
kbcok Witt
.
CO
2107
1
:1.
1.
it
i
15 AN:51.
ACAS
.
Figure 4.4. 5 V Reference Supply.
4-15. Digital Supplies.
i
14-16. Secondary voltage from line transformer Ti is l-Wave reciitted by CRI, CR2, CR5 and CRO. This provides a +8 Vunregulated source for the constant current display drivers on AS and the digital supplies. It also provides el S V unregunted supply for ATUI.
-17. +5,05 Volt Digital Supply. Q2 is the series pass element for this supply, Riis it cur. reni sensing resistor which sets the 1.21 ampere current limit value when wciplied and led back to the base of the pass transistor by R2, Ry, and UPA. The output current cum he calculated by measuring the voltage neross RI. Regulation all 15.05 volts is achieved with UIA. The input + 5.05 V is voliage divided by Round R7 from the + 7 V upply,
|| || TF01 IMET MUUT "
4-18. +4,8 Volt Printer Supply.Qil is the series bass element in this supply, RIO is il cur rent sensing resistor which sets the 670 ma average current limit value when weighted and damped by RII, R12, and CIO, and led back to the base of the pass transistor by UID). The
7.
Rev. A
PPV17'4+
INY
-
-
-, Y
Y
-W
---
-
..-
-.-
-
.-
.-
-.
..
-.
I
Muud on
I beurs on petition
damping increnses the response time of the current limit loop so that large instancous printer current demands 012-3 amperes con be met while limiting the steady-state output current to approximately 670 ma. Regulation or +,8 V is achieved withi U2B. ihe input +4,8 V IS voliage divided by R15 and RIO from the +7 V supply,
ANALOG THEORY
4.19. SCANNER.
4-20. The Logging Multimeter boas lour separate llouting input terminal pairs, Ench pair (channel) is switched to the analog function relays through a lour channel reiny scanner wider MPU control. The Senner and Function relay input arrangement is shown in Figure 4-5. 4-21, Relays K5 through K8 switch the seleciod input terminals to the appropriate function amlog inpui, K9 reconfigures the input amplifier lo place the input terminals in the feed back path of the input amplifier for the kn and TEMP functions. K9 uso connects the ohms Overvoltage and diode protection circuitry into the locdback path of the input amplifier.
SCALPit
HEIDS
HiT 1.3
_
.
-
-
'
+
+ +
-
F
--
ut) AC in WALL WANTS
--
----
-
-
-
--
-
-
VILLA
-
--
-
--
+
.:
,14
-
-
-
-
1
-
.
..
.
H AUT IMTch
(L MIT EINE
.
- I
.
D)
T!
-
At Hall
;!!
-
.
* HDL
Figure 4-5. Input Sconner And Function Switching.
4-22 Relay decoding and coil drive is provided by A9U1 and A9U2. The truth tables for these l of to decoders are located in Tables 4-1 and 4-2. Encoded relay closing information is passed to AQUI and A9U2 from the instrument data bus by the RLY device latch on AH. A9QI drives K9 in the kill and TEMP functions, 4-23. "Scon" Sequencing.
1-24. Swimmier relays are closed prior to limetion rely's lo reduce tre currents due to the inherent los lo chassis alumnel mapacitados. Serinner relaw's ille cannet in it -|- --,
Rev. A
4-5
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Model 51071
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Table 4-1. Function Rolny Drive (U1),
Rolny
FE LODCC B Function
| 001V > 200 mv Ooilo
-OOOO
O
k02
K6 KG K8 K7 Nono
-
1 X
V 5200 my
None
X
X
|
FE
- Function Enoble (Low Truc).
LODC = 20 miV ond 200 mV DCV rangos control line from
AIU201.
Table 4-2. Sconner Rolay Drive (U2).
SE A
B
Rolny
OOO K4 01 KI 01 OK2 011 K3
1 x 1 x None
SE = Sconner Enoble
(Low Truc), 4.26. THE MEASUREMENT CYCLE.
4.26. A-TO-D Conversion Method,
1-27, The Dual-Slope Integration process is the method used by the long lultimeter to convert the analog inpui quantities to digital dan, Dual-Slope Integration methods are : herently insensitive to noise al power-line frequencies. The entire conversion is basically a tour step process, 4.28. The Four Moosurement Intervals,
4-29. Tlie four measurement intervals required for a fill conversion are:
AUTO-ZURO INTERVAI,
| - (CH) RUN-UN INTERVAI. cm) - 13 HOLD) INTE:RVAL.
RUN-DOWN INTERVAI.
The intervals are limed and controlled by the Voltmeter Control Chip AUI, which establishes liumerion, Range und interval conligurations with the input and integrator Hybrid switching circuits. Retur 1o ligure 4-6 throughout the following description of the Measurement Wycle
1-0
Modi 34674
Theory of Operation
1-30). Anti-Zeru. The concept behind the Auto-7.onu interval is essentially lo Current balance the summing junction of the fileumlor (AQU00)) for i 20 input condikon. The result osures that to current flows through the Integrator Capacitor (A4C000)) lor in beginning of the run-up intervni. The current balancing m eliminates RunUp errors die to Integrator online currents and inpui Amplifier ol'tst volumes.
-31, Refer to figure *-7. The reference current R, is switched to the simming junction of the integrator and a volpe.to-current liccback path is switched to the summing function from the Slope Amp output. The Auto-cro Capacitor (A2070))) stores the feedhack eur. rent as a charge which is the controlling input volinyloJPUT 49070)A, il voltage control led current source. The resulting Meedback current in Serves to ndjust the balancing current IK sitch that the integrator summing Junction is current loc, whileh menys no current flows through the integrator Capacitor. The concept, which is illustrated for the DCVUC tion is similar in other londtions, the only dirterences being inilie derinition of il/ero input condition for the volme funcions (DCVI ACV) This is at O V input to the Input
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Figure 4.G. The Measurement Cycle, AMP (inputs switched to ground). For the OLINIS and TEMP Minctions, the Ohm Zero line is switched in.
All
4-32. Run-Up (Refer to l'igure 4-8). During the Run-Up interval, ille inpui signal charges the incrutor Camcilor for a linud length of time. This requires that all inputs de processes into a DC voltage which can be used in Run-ilp as the charging Voltage: The Ohms Como verter and true RMIS AC Converter achieve this. The proportional DC voltage is application Run-Up resistor in the integrator llybrid for approximately 100 ms. The resulting charge oli A9C600 is proportional to the input. At the end of Run-Up the processed UC value in removed and the measurement cycle begins the old intcrval.
1-33, Fold, Thellold interval is lixed nt approximately 1.6 ms. During Hold the Voltmeter Control Chips Senses polarity sind sets the proper Ruil-Down (onligurations.
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Figure 4:0. The A-To-D Converter Section.
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Thicory Of Operation
Muusi 1071
To'y Of Oulun
4.37. DC VOLTMETER.
1.38. The viene processing on DC voltage plus comitions the menude of the input Voluge in within a 1.6991) voll minne mil the input of the the or. Ilie Import and Pos! Ampliler gun conl'ignation por all range of impul sultngos shown in Figure 1-).
IMANTiW,!'
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Figure 4.8. DC Gain Configurations, 4.33. Input and Post Amplifiers. 110. Cinin contigurations are .cl on these amplifiers through VIOS-LTET Wcling within de Inpur llybrid. The Input Amp is uw huise inverting amplit'ier which is nisu opentuel 110n-inverting in the 20 mVal 200 MV DC rues to further reciler hose, The Post Amin provides additional gain to properly scule the integrator impur. K7 ks cloned in the 2011: Vine 200 mV ranges and K5 is closed on the 2 V, 20) V, 200 V ime ,3.50 V ille's lo apply the input to the approprinte Input Amplinier lermimi.
4.41. AC VOLTMETER.
1-2. The signal processing on AC voltage impus conditions the mainitude of the impre voltare lo within a ti voli rango all the input of the Trilo-RAIS AC Converter (ADU ). The AC Converter supplies « DC output voltage m enintiently squivalent to the RMS value of hempul. Truc-RMS Converters have the inherent advantage of arturniely XIVCI ting even distorted simusoidal and non-sinusuklal waveforms into a DC voltage represet
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MINO RAISue of the input waterms. The volue omputisten in het lurthe Kun-up votime in the Run-up interval. The True RMS AC Converter MU'N Roll Tinert for input below 160X) collits and verlore romlines below the ville should be ob Halered movili,
J. Huta I-10illustrates the cuina istemal' sonlurations that condition the impul lor AC101) conversion by ille Truto-RAIS AC Converter. One the Consion to DC is made, Ille MET MIll Lytle is the mean the DCVMerlot,
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-15, Unknown resistances are measured by placing them in the Indbuch path of the imp Ampliler and yoteiny a how curt, drough the This results in XCompui ultere from the input Ampliller whileh is proporciona toile unknown resistance: Ksand Ky kon lipurile OUSIS Converter for the Oms-10-volla conversion. The feeliniu l'equires in
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4.48, Ohms Current Source,
+-17. Huuto. 11 fllustrates the Munction of the Omis current were in the O s contigerit tion. The input voltage to the low output impedance butter (UIC)) I slurinud rom the 15 voli rulerende by volta divider action. The divider produces a . Vnput for the 2001 range when A9RIO Mortel by A90100). In other
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Theory Of Option
put in 1 Foll. The MOS-1:1:1 W uling within the Impu llybriel applies the 5 V or IV relrenne (V ) 1 an Intern Il trimmed referente resistor. The other end of the retchenesistori minime all wirtunt ground due to the large open on aninolthe topu Amplifter. The result in OINS reference currently thereure V R Higue.-12 Illustrates the O scutent source and retirenee vale lor neli Olimineer muge, 1.10. Olims Culiyatsion.
fly. Durinu o Auto-on), the Obm Aulu.on line is switched in, thereby using the potential at I mine function of the impul Amplifier is
H ero Inpul condition". Dette woms Rund-Up, wice the input impedance of the pumpilier is altremely bigli, all ) the Ohms cuirten (1) tossthough the canner input lerminals and ille innown restance IR,) bet lehen. Misation develops an impul Amplilin oltu lugewiich is propor liunn in the known force, liqumtion Holives the relationship between the resultant DC voltage and the how to stance,
Pue":,5R, Vimion .. 1,50. The resultant DC voltme is within the proper ringe to be used as a Run-Up vollage during the Run-Up interval. Once the conversion to DC' is made, the measurement cycle is the same as the DCV and ACV Motions except that the Oluns reference voltage is used for Run-Down in place of the +5 V reference,
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4.61. Olimis Protection.
4-52. The (HMS circuitry is pruiceird Tromllle accidental application of large scanner ler mimni voliages by a diode protection mework and nu overvoltage protection circuit.
4-53. Dloste Protection. The diodde network protects the input Amplifier and OLINIS VIT rent source by limiting the voltage ni ile inverting input of the mur Amplifier io.7V LACR2010) in the negative direction and +1.2 V (CR201 & AUCR202) direction. Since this limits the "HI" Scanner input terminals lo near ground potentials, amouer scheme is nender lo Isolate the *** OW" scanner inpu terminals from the OHMS
circuity upon application of on excessive input voltage,
Theory of Operation
Modul 3.1074
TEMP
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Figure 4.12. Ohms onu Temp Configuration.
4.54. C! voltuge Protection. The overvolmake protection circuit is the second scheme. This circuit acts as a level sulcer for the input Amplifier as well as at higi-voliage burte between the "LOW" scanner Input Ierminal and the output of the Topel Amper bientally, the OHMS Overvoltage production circuli isolates the liput Amplifier from the non-limited "OW" Terminal for "1"-10:" \" volinyes extending approximately 4.7 volis. Ruler to l'igure -13, Under normal OHMS operation, A9Q205 is saturated and the output of the Input Amp is level shifted from the "LOW" termina). An excessive positive input voliage will drive the "LOW" icrminal lcgative and the output of the lupul Amplllier more negative. The collector of A90205 goes to iboul ground potential whilst reverse vinses AYCR220, the solution component for excessive positive input voilages, Mi excessive negative input voliage drives the "LOW" terminal positive and the output of the input Amplifier more nositive. A9Q295 (Uts-oft and in the solution component for eStussive neuntive Input: italges.
4:55. TEMPERATURE MEASUREMENTS.
4.56. Temperature jeasurements are milde with an exterou thermistor. Thermistors are temperatur: varying resistors with a high negative temperature coellicicul. The thermistor used by the locking Multimeter exhibits a 5k resistance at 25°C, The temperature of this thermistor is enduated from its rexistence by a two partomaritumie model. The models a mathematical descripului, of lieve the thermistor's resistan. Vitries as a junction /
temperature. Cuble-3 is it tabular listing of this relasionship
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Figura 4.13. Olms Overvoltage Protection.
Celsius or Fahrenheit temperature 4-58. The resulting Ohms nensurement is converted to by the linearization routine which fi performed in "TEMP" as part of the "MATH"nr
Toble 4-3. Thormistor Rosistance Vorsus Toniporsture 80" 19 +150°C.
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R Led resistance, R* Thermistor resistance of the measurement
Temperature Imom Table 1-3,
Worst case sensitivity at 150°C(270"1) 1. -,1065 C/O (6,8.398 1799). 4.00, HYBRIDS.
4.61. Input Hybrid (AQU201),
1-62. The input llybrid contains MOS-IDT switches and loser-irimmed resistors. Il serves its progammable gain and control switching for the Imput Amplilies stage, Finneilon, range, and measurement interval switching and ming nire controlled by codes from the Volimeter Control Chip (AHUI), which controls all measurement cycle functions and motoruying.
5:03. Integrator Hybrid (ASUGD ?).
4-64. The Interior Hybrid contains MOS-FET switches and lusci-krimad resistors. Il serves ils programmable gain and control switching for the post Amplifier silke. The lui
alor llybrid also switches the measurement "ycle current ecording to functivii, 1:111., and measurement interval codes from the Vollmeier Control Chin.
DIGITAL THEORY
4.65. INTRODUCTION.
4-60. The diflinijurtion of the Legging Mulawiter consists of the following cight bord!
1. Digital Moner Board, Al. b. Processor Board, A2 C, 1/0 and Timing Board, A3. d. Volimior Control logle Board, A4.
Display and Printer Control Board, A5, 1. Display Board, 16. X, Top Switch Board, 17. ), Bottom Sylch Board, A8.
and all associmied intercomicction.
4.67. Turms And Abbreviations,
4-68. The following terms appear in the Digital Thicory Sul-Suction:
ASM
- Algorithmic State Minchine,
1-11
Model 34671
Theory of Operation
DIT
-
A Binary Digi. Positive louic, higli true,
BYTE
- 8 Bits, Contents of a memory location.
DEVICE
Selectable lutch or buffor. Devices are treated as memory locations.
HEX
Abbreviations for hexidecimal (Base 16).
1/0
Transfer of data to or from memory (ROM, low power memory, or devices).
INTERRUPT
- Input stynal to the microprocessor used to request or
initinte special program scquente,
I.SD
Least signilicant digit. The fourth digit of this of 1/2 digit instrument.
MPU
- Microprocessing unft. The MC6802.
MSD(S)
Most significunt digit(s). The first 3 1/2 digits of this # 1/2 digit instrument.
NYIBLE
- 1/2 01 BYTE. 4 bits.
RAM
Random Aci CSS (READ/WRITE) memory,
ROM
– Rend only memory.
- low power memory supply voltage,
Vi
Veci
-- +5.05 volt digital supply voltage.
4.69. DIGITAL MOTHER BOARD.
4-70. This bourd, Al, contains the digital power supply circuitry, and all connectors and Jacks for interconnection between the logging Mulineter assemblies. Connection to the Analog Boord, A9, is vin iwo 16-pin din cables (W9-1 und W9-2).
4.71. PROCESSOR BOARD
4.72. The Processor Board, A2, contains the instrument Microprocessor (MPU), ROM resident Operating Systen, Muster clock source, ir strumieni datu bus read/write comiroland bullers, and various ROM and device address select circuitry. The theory which applies to this board can best be dealt with by describing the instrument Microprocessor um.l generaliz ing the Operating System.
4-73. Device latches are mapped" into locations in memory by the device select lines and are actually troniedus memory locations by the MIPU. In other words, information is written lo them by storing at their location, and information is read from them by loading from their location. This is the Indierent method of inpui, Output in mapped processors sich als the one used in the Lugging i luleimeier,
-15
..
.
..
Thicory Of Operation
Modul 407A
11-74. Table 8-1A in Section VIII is a fold-out summary of I/O devices and strument ir..semonies. This table can be unfolded and left for reference throughout the remainder of This section. The complete map of MPU memory places on-board rond/write memory (RAM) 1 HEX addresses 00 Uhru 71, the Instrumeni Dara Bus and 1/0 Devices (for valid dana) a1 80 thru Ff, and KOM (for valid daan) at 2000-10-31:11. Mr Low Power Retention Memory is a 6H NYBILLE RAM (4 Bits wide) which is rend from a devlec address 1:5 and written to al device address 16.
4.76. Microprocessor,
4-70. The Microprocessor used in the Lording Mulimeler controls the instrument math operations, Internal data transfers, and all display and poult imetions, the specific unit used in this instrument is the Motorola MC6802 MPU.
4-77. The MC6802 is a monolithic 8-Bit parallel microprocessor which is a control oriented version of the popular MC6800. In addition to two 8-Bit fccumulators, three 16-Bit dedicated registers (index, stack, and program counter), and one 0-13it condition code register, the 0802 contains an internal clock generator/driver (externally driven at MHz In the Logging Multimeter) and 128 bytes of on-board RAM 4 HEX addresses 00100-10-0071, The architecture of the MC6802 is shown in Figurt 1-14,
*-73. The Microprocessor is supported by ! Ok byte RONI Operating System whileli
stablishes the instruineni's scan, ottici, rend, math, display, pred, and lost routines imler both m etal and iimer control. A brief description of the MPU signal lines and their operating conditions follows,
ADDRESS BUS (AJA
IP'U utilizes I address line's (A,A) for addressing memory and devices (uimer, primer, display, CIC.) As an As are used only in the "IT:ST" routine a Sirnature Amulyver start and sop control bits lised by the hip-50041 in a locking Multimeter service process,
DATA BUS (Do-D)
The MIPU darat bus consists al 8 bidirectional, Irinte lime's use for instirring lala
w/1te11 cevices and from control RONIS,
READ/WRITE (R/W)
The VIPU K/W line
unable devices when the NPU is reading liom tlum (chaped limo, status, NIE) I writing to tiem (print dalil, cisplay dati, ul.). Tlie normal wandby Nate of this time is Kad thight),
EL. ABI.E (E)
The.BU wable uitput line do control instamment dimint, This vign is curisci trom the AIPU imir Kloch eherator and is used as a master cloch (CK). and is IMIT Muline Wille
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Model 34071
Theory Of Operation
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TAL Vit 5 ------
CCR
CLOCK, Ati$ THUCTION DECODE Arif
CONTROL
ALU
CNALLE
L L
DISTRUCION
HEGISTER
1461A-19
L LLLLu
Figure 4-14. MPU Architecture.
RESET (RES)
ludu
The MIPU Reset input line is used to reset and start the MPU when it is stuck or a second is lost (refer to theory on 3). The RES line is also used to reset the MIU atter power-un
TON).
!!
Extol and Xtol
The MIPU has an internal clock generator which is driven at these wo terminals by x1 + M1L/ crystal controlled (Y) Uscillator,
1.!!
!
VALID MEMORY ADDRESS (VMA)
The MPU Vild Memory Address output line is used to enable devices when there is a valid address on the MPU address bus,
-17
LINTI IIII
.
------
-
Theory of Operation
Model 34671
INTERRUPT REQUEST (RO)
1
The MIPU Interrupt Request input line is used by the power drop detection circuitry to signal the MIPU when Vertalls below 1.83 volls (adjustable from 4.4V10 5.21V typicnt). Upon completion of is present task, the IRO line is recognized by the NIPU and the low power memory is isolated
LL
4-79, Interrupts. There are three interrupt conditions which will cause the MPU I enter pre-defined service routines, Talia tot lists the rouines by imerrupt condhion and provides brler descriptions of ench.
Table 4-4. MPU Interrupt Conditions.
Condition
Interrupt Type
Desciption
Turn on
Ruset (RES)
Restart Initialization Level Sensitive flow clours MPU,
positive edge begins testatt routine)
I III .
Power Down (Vcc * 4.83V)
Interrupt Request (TRO)
Interrupt is masked during RAM
updating 12 ms maximum) when
Vcc> .75 l, I ove Sensitive
1 Hz Time Bose Lust Reset (RES) or Stuck
Ty/o seconds have olupsud without a
timer toset {lost) or two timor tusets hove occured without an elapsed second stuck).
Hinta..
4.80. ROMs.
4-81. Ilie Logging Multimeter Control ROMYCwmhain the instrument operating system and Sull-Test programs, The Lorging Multimeter wey 2k Byre ROMS which are arranged as:
i
RONIO (U2) ILX LOCATIONS 2000 1 27111: ROM I (U3) TEX Loentions 3000 10 371117 RON ? (U13) TEX Locations 3800 10 371:1:
la
The address decoding enables the control ROM for valid memory audreyes then above wlion the MPU male line is high.
4-82. A flowelurled version of the logging Multimeter ROMI Operating System is given in Figure 1.15. The lowchart is provided as additional insight into the serTELS involved with controlling the loguing Multimetur. Notice that one is through the Jon Control 1.00p) ut curs for each completo measurement or mantintly incremented digit, also notice that the Sell Tess routine does not involve pissing through the entire Job Controllop,am that the "SCAN," "READ)," "O S" and "PRIN" routimes are shipped when a measurement in not required. The following paragraphs describe the instrument managemeni routines which are portrayed in Huure +1-2 und 4.15:
"INIT"
Initializes the logging Mallimeter hardware and RAM. This routine is performed atter in
#18
Rer. A
HO+,...
7
4
.
227
44
V
-III'YIT
,.
.
.
.
.
.
L"AL
)
Model 3461A
Theory of Operation
+
+ ?
Tu
I
-
--
-.
F
.Y
1:
..
TI
Figure 4.15. Operating System Flowchart.
sirument turn-on or upon a suck or lost microprocessor situation. It is not part of the Job Control Iwop of the operating system, meaning that it is not performed oncept on the above conditions,
"STAT"
(T1)
The status update routine is the beginning of the instruments Job Control 100). This routine Checks for iimer conditions such as elapsed scrund and solstimer status accordingly, It also checks the sea and volumeter front panel conditions to determine the IN Chan. mel, function, and range status to see the limber olmloy-lo digital conversions required for each measurement is determined here.
"TEST"
This routine checks for a selected liont panel "TEST" pushbutton. Il selected, the channel pushbutton sellings are checked to determine which of lives possible Sellest mocles in selected and the appropriate sell-Test rou is tien perlurmed. Il nou selected this routine ends with it check for the manual entry mode. Selection of the "Y" (Immun onry) push bution will branch the system to the "ENT" rouine as will the absence of a selected as nel.
Till
Desclection of the TEST front panel pushbution (selecting another function) returns the processor to the Job Control Loop entry point JCI..
Rev.
-19
TL. im
Theory of Operation
Model 34671
"SCAN"
This routine determines the next scanner and function relays to close, the closes them. Ir nothing lis changed the same renys are secured. limo channels are selected the routine will open all channels,
"READ"
(12)
This routine performs the required number of A-lo-D mensurement cycles and essentially
SSCs controllo the Voltmeter control Chin during much Collversion. Alter the last conver sion the digital data is transferred into the processors' on board RANI. More information on the transfer is included as part of the Voltmeter Control Logic description Inter in this site ton. Channel 4 measurements are stored in the location designaged lor the X:Y Math reference,
"OFFS" )
1T9)
In his and TEMP, this routine suhimicis + ohms from the measurement to compensate for resistance contriburlons by the high/low times and fuses. In the ko and TV functions, it checks if the "V, 1 ZERO" pushbutton was selected and il so stores the reading obtained in the "READ"routine as an ultet il it is less than 2011 or 2001V. Allerons are stored for the result itself. This results in the zero display which is observed when the display data RAM I louded in "DIS". Readings which are too large are not treated :5 ontsets, they are lunored.
"ENT"
Iliis routine is entered when the Y (manual entry) pushbution is depressed or no channels are selected, since both cases do not require a Scan or measurement cycle, the stored reference value is transferred to the display butter location in the Y manual entry pushbutton Is not depressieul. A depressed y manual entry pushbutton will ther:
11. Store "CID
into the display butter locatiunil Channel + is selected
OR
b. Modity the display buffer loci con according to monicntary codes (1.e. fueremest kl digit).
"DISP
This routine londs the display data RAM will the contents ofilie display butter location and enables the display. During some Self-Test routines the display bulter lountlonls empty times and no display occurs. Once londed and enabled the display control circuit will stan the display dan RAM on its ow),
"OVER"
This routine checks the "OI." bit which is received as mrt of the serial data transfer from the Voltmeter Conirol Chip during the READ" routine. This will result in formating an "OL." dispany in DISP" or "Ol," print in PRIN, Kendings and resuls are also com pared nunjust their allowable limits and similar It mutiny may resuli.
.
.20
CL.
Min. _
.
'
I.
'i.
. ---
-----
----
--..
Model 3467.4
Theory or Operation
"TEMP" IP/O "Moth")
This is the ohms to dogrce conversion routine based on a two part Logarithmic thermistor model.
"MATH"
This routine will perform the selected X:Y MATH Operation which was requested for the measurement, Amatlı result premier than I 19999 will result in formatting an "OL" dispiny In "DISP
"PRIN
This routine checks the timer status and printer control pushbutton settings to determine il'n print is required. l'rinier formaning is done with respect to the selected character orienta ljon, timer status, and type of print (timed or manual)... "OI." is then printed. An overlond measurement or result formats an "OL" print. Lack of printer paper formats the "OP" display,
4.83. IO AND TIMING BOARD.
4-84, The I/O and Timing Bonrd, A3, contains the input data bullers, low power memory, power up/down timing, and I Hz time base circuitry.
4:35. The Input Data Buffers.
4-80, The devlet-selectableratu buffers are used lo selectively load l'ront panel wilch intor mation and oilier signals (timer status, °C-F selection, c.) to the Microprocessor, AJUI IN the device select decoder for these tri-state devices,
4.37. The Low Power Menory.
4-88. The Low Power CMOS RAM (AJUI2) is a 64.block of memory lised to store the Logging Multimeter constants and instrument status, it is updated once during the control loop by addressing over the instrument data bus (FO) RAM is preserved in a low power standby state during a power-drop condition. Worst case power supply drain sets the 5 second liold specification,
4-89. Power Up/Down Timing.
7.40. The Power Up/Down Timing Circuit establishes the Instrument turli-01, power return, and power drop sugirices, Power drops are defined as a line yolinde condition sulti cient to drop the +5 volt cligital supplyio $4,83 volis, Relerlo Higure 4-16 throughout this description.
-91. Instrument Turn-On, Turn-0)11 moves the IRQ condition and provides the RES 11 lerrupt required to restart and initialize the Logging Muliimeier. The low power memory supply, V is discharged initially due lo the shorting action of the "LINE SWitch (
ASI) upon turn-oil,
Rey,
7-21
Theory Or Operation
Model 1 167A
.
----
--
-
H
.
***
TH,
. 11. -
4
AF
.
T
RATO II lol,
Figure 4-16. Power Up/Down Sequencing,
NOTE This assumes the "L.INE" switch was used to remove line vollege,
Hola 1 external master switchi. "MOK" is therefore low when checked during turn-on and a full restart occurs rather than a re-lond from low power RAM,
4-92. 10W Power Retention Supply, Yoni The low poner RAN rutenium supply is developed by a brit on AC1 when :NA goes low (approvimely mis alle Vis minches 1.83 vots), Tn. charging circuit for de Vistorage capacitor is shown in ligure 1-17.
---+
+-
+---
+-
-
-
-
-
- --
--
- - • •+
{
LT---
-... ---- P/0 A5 t on RAM STANDBY SUPPLY
E
-
t
w
.
.
.
-
-
A6 SIA
CRS
LIFF
R ?
27K BV ------ -
RIO 330K
TT HITT
330 ----- ------ Vc
--
c
)
...o
***
1220
DI STORAGE
LICIO
I... --- --- - CAPACITOR
RII 330K
ENA )
3461A-2
-
-
w
Figure 4.17. Power.Fou! Stonuby Supply.
7-22
Rey,
Model 3467A
Theory Or Operation
4-93, Power-Drop. Assuming the 4.83 V adjustment was properly made, a line ulitchi or drop-on below .83 V will cause IRQ 1o yo low, thus requesting interupit service from the MPU. This is done at 4.83 V becituse the MPU may be Dusy" for up to 2ms before notic ing the interrupt. Actually, the interrupt condition is Maskud for up to 2 15 17 management routines, The MPU must notice the interrupt before Ve drops 104,75 volts, The IRQ Interupt routine begins aller RAM updating is complete, II's essentinlly a wait loop whill V linds itsell the only remaining instrument supply or il power suurus (Glitch).
',
4.14. Power-Return. A return from a power drop will act similarly to a furn-on il Ve Pell below 2.25 V during the power-drop condition (V. is not shorted since the "LINE" Switch was not turned off), IT Ve remained 2 2.25 V hroughout the power-drop conditioni, "MOK is high when power returns and the still valid low power memory is copied into 6802 Mivory. The Logging Multimeter performs a Manual Print as an indication of the in terruption and londs clapsed time, alarm, ofisets, Jast ranges, and Channel 4 constants from the low-power RAM.
4.95. 1 Hz Time Bose,
#26. The I Hauime baise circuit is n 6250 H2 clocked MOD 6250 asynchronous counter with partini reset feedback. The output of UIOA provides the 1 Hz time base. UIO B is us: as a Seconds trup, being reset upon turn-o! (PON) or after a successful clapsed time update,
The second sticcessive second interval without a timer reset (TRE) produces a RES inter rupe, meaning that one second was missed. The second successive dimer reset (TRD) withou an elapsed second also produces a RES Interrupt, meaning that the MIPU is lost, the MPU ROS line is level sensitive but the "INIT" routine begins alter this line goes high,
4.97. VOLTMETER CONTROL LOGIC,
4.98. The Voirmeier Control Logic, At, controls input and integrator Aplifier switching, measurement cycle timing, Run-Down counters, and serial output transfer timing to the Microprocessor. Tlie lenst significant digit is generated by a coupier external to the voltmeter control chip. This counter operates all ten times the clocking rate to obtain the required resolution. Refer to ligure 7-18 lo licin darily the following description.
4.98. Voltmeter Control Chip (A401).
4-100. The heart of this poriton of the instrument is the Volimeter Control Chy, Ul. This chip contains the 31: digit MSD counter, polarity sensing logic, output buffers, and Ilgorithmic Stale Machine (ASM) logic wl.ichi controls the autorunge, Mensurement cycle,
output timing, a functional block diagram of this chip is shown in Figure-19. A state diagram for the Voltmeier Control Chip is also given in this ligure.
4.101. Voltmieter - Microprocessor Interface,
192. The measurement wycle begins during the "READ"manuement routine when the Microprocessor writes to device VMC, resetting and cabling the winners and closing the Auto Zero loop. After approximately 100 counts, the MSD Counter is renet nunin and Voltmeter Control Chipsets the Run-Up interval and switching. Ilie Run Upclock (ROC) is aktive during Run-Up.
Key. A
2.23
.
-
Theory or Operntion
Model 3467A
.
.
.
.
luit
101
= --
.
ini { " 7111*+1)
Em
- M.
.
D.
.
Toim
liit:
...
D
PENC (KCS:11:
Bloc CHILEE
. *
-
-
---
---
i
Him. +.
.1-.
+
-
.
MK "
CELAS
-
--
V
Inf
-'
ciri
:
+
ICC
SP?I..
11.4t
L
17.
Figure 4-18. Voltmeter Control Logic Block Diagram,
-103. During the Ilol interval, the counters are reset and the polarity of the Run-Ups sense, kun-Down is then configured, during which the MSD's and L.SD counters run until it cumparator transition or overlevad occur. The comparator transition Hi (TO) on Figure 1-2 sops the counters by disabling the clock source, l'he I.SD transfer signal litchies the I.SD data into AHUIT and isolmics the VISD counter in the Voltmeter Control Chipa (17), The clock is re-enabled m (T8) and sed to shift the NISI) data to the output butter or the Volimeter Control Chin. The MISD) mid LSD counier daim is l'imally transferred to the Mileroprocessor, The NSD) dan is transferred serially out of 10D", Atiminy diagram for it simple measurement is shown in Figure 1-20. The I.SD data is transferred as a parallel.t-1Bit nybble to complete the data transrer a ('79).
4,104. Codes.
+-105, The function and range codes zenerated by the Volimdter Control Chip control the Input and Integrator Hybrid switching throughout the measurement Lyole and establish the Input and Post Amp gain tonigurations to provide an integrator input within the t1 V Colestraines,
1-24
Revis
Model 34671
Theory of Operation
IL
TILL
G0006cee
30.
Figure 4-10, 3407A Voltmotor Control Chlp,
_17:01.01.00.11.17.11.07.0.0.11.11.07.07.17.0.17.11.17.17.17.16. vt -
2 .
2
YLE
Funallon IFNI
Monge
ino:
FEN
01
20 mV 200 mV
2 V
010 000 001 01 111 110 100
20 V 200 V 350 V OL
200 mV i
2 V 20 V 200 V 250 V, OL
2000
2 k12 20 kB) 200 kn 2000 Kit
20 MW
"Som tot lep. **FNA I Blways "I".
Figure 420. Voltmeter Control Chir Sorint Output Timinu.
Revit
7.25
11011111200) 10 $10.11.1.
Model 1071
4.106. DISPLAY AND PRINTER CONTROL.
4.107. Display Control (PO A5).
#108. The Display Control Circuitry contains chciats of display data storage atrineal als 16 toit data s ining arrangement, segment and constant current cligit driver, and the Nessary cloch vireulir).
#109, Display Data RAM 1.cmdiny, Ilie display data RAM, UIG, is for iled with the current 8 BYTES ofronding me anuncio talist during the DISPmanagemeni rutine. This is Ilocomplished by clearing DATA US LINI: D7 and willing the display datu lo devlet
DSI 1 I... -Bil nybbles. 17 is then set and written agnitlu dlesice "DS"". This resets the display clock and connables the segment camper, U12.11 also allows the display scanner, U18, to wycle through display dan RAM adresses while duin is latched owl to the digit driver's (tis I WU-Bit nobles).
4-110). Display Scanning. Refer to ligure 1.21. The display clock establishes ile 0,25 111 display cycle and the two liching vienals per display cycle. The last old nybble is lelied arial the display sunner is ineremoniad, thus addressing the lirsin' mybbleur RAM through the quad 2-10-1 de selector, 1117. This datas Iniched and the display summer ipuin il cremented to provide se sekond new nybble (esseninully stop-akcieplota l'W doplay lyle).
4111. Display data is arranged by ement in the display data KAMI. Tliis means that line address contains the seement Informatics and the bit contains the digit information. The result in the cement "A" is lit on all appropriate digits, then segment "1", "cument "(", and so forth.
1,0 A5
---- --
15!!!; ;)
-
-
ull; DL:FIAT
-. -. • --
+
1.!
1!1!,
ir 1114
1!, .
SiH:13
111110}
tlar
UD
U
UU!
Tito !
titill
.
4
46
Figure 4.21. Latching Display Dota.
:
71
2
Mullet 3407A
Theory Of Operation
4.112, Printor Control (PO AG).
4-11.3. The printer control Circuitry contains the printer denet kateh. Motor direction decoding, timing counters, and a portion of the moor speed control loop.
4-114. Printer Dala. The 7 bits of printer thermal head dan and I bil of primer direction information is wrillen to the printer control latches (U1, U3 & UX) during the "PRIN subroutine. This is a complished by clearing DATA BUS LINE D7 and writing the printer data in device "PRI," The low D7 line dates the sample clock (SCI.) 10 the printer motor speed control circuit, thus establishing a forward motor direction. The printer motor speed control loop serve's lo regulate the printers forward speed through a simpled ENIE Icchinique.
4-115, Motor Speed Control. During Tl (refer lo schematic Olof "SC1.", the motor speed control loop is lohen and forward motor drive removed to allow the bitch I:NL: transient from the motor to die om. During T2, the printer motor LMT js Monik i dand compare 10) a lixed relorence to delerinize it the motor is too list. If the motor is too fast, she V iena from ille printer ilssembly is high, thus removing the WD motor drive signal whenever ile speed rises during T2. If the motor is too slow; the V, signal from the printer assembly in low, this applying IWI) drive cu the printer motor whenever motor speed drops during 12. The matural responseille molor to this intermittent drive/mo drive action of the TWD line Serves to create il constant motor speed.
4-116. Direction Decoding. There are two methods used to send the prinier home and illis i line-leed, Setting the direction bit 17 ind writing to device "PRT** establishes il revers molor direction which sends the thermal print heild home where the motor is briched by the **HOME:" switch flow at liomc). Suing the DRK"line (high at home). If the lieria prima liend is not in the home position (say, alior printing a line) and the revente direction code is not received perhaps il dropped bil), the U41 protettion timer automatically sets al reverse direction code atier waiting z1.3 ms for another "PRT**. This sends the thermal head home, preventing printer damage igninst the fir side of the primer wall upon il subiscattent printperation.
4-117. Primi Head Data Strobing. The "STP" signal generated by the printer ilssembly is Wied in modutaleve thermal print lend data iltal0 kiltrate. Tieduty cycle olinis signklin varied by the printer alisembly such that it is inver: 'ly proportional to the printer supply voltate, The Path is a uniform prin intensity, regardless of light power supply variations.
4-118. The print intensity resinor, RPN*, is factory selected to set the duty wete (W) of the "ST?}" signal for the proper print intensity, Selecting a new RI** value is explained in See Tion VIII, “SERVICE", however, the factory selected value provides the optimum print head life. The "SIB" signal duty wycle is approximately 70'+ !or the 7,8 V primer supply,
4.119. DISPLAY BOARD.
4-120. The Display Build, A0, is arranged its an & digit. 8 vegiment array: Five digits ille used for displaying measurement results leaving 3 digits for immunciating instrumental,
4.121. The "XV, ZERO" and "LINE" Switchie's alre il so on this board. The low-power tremory supply. V. is brought to A6 by W3 und is shorted to ground loy the "LINI" switch, SIA, when OHT. The Olnis/oro switchline, "07", lealen 16 by W3 und in coded on AS along with the other instrument momentary contact siche's,
Rein A
4.27
Thicory Of Operation
Model 3407A
4.122. TOP AND BOTTOM SWITCH BOARDS.
4-123. The top and bottom Switch Bunris, A7 and 18 respectively, contain the front panel pushbuttons used 10). Select the Lorg Multimeter linction, ringe, timer intervall, math mode, entered reference value, and printer control information.
4-124. All momentary contact switches ("STEP" and "XV, ZERO") are encoded on 18.A7 contains on isolation transformer used to isolate the out of paper switch (OOPS) on The Primier Assembly, Al, from the A7 board. A low-lo-chassis spark yap is included on 17 lo limit static build up.
4.125. PRINTER ASSEMBLY.
4-120. The Prinier Assembly AP, is a proprietary Hewlett-Packard Assembly. Thicory on this particular assembly is not presented liere,
4-28
Modul 1071
Performance Tesis
SECTION V PERFORMANCE TESTS
5.1. INTRODUCTION.
5.2. This section of the liritual contains recommended test procedures for verifying the Lupying Multimeter specifications as listed in Section 1. A performance test record is provid ed at the end of this section for your convenience in recording test results. The cost record may be reproduced without permission from Hewlett-Packard. All tests can be performed without access the interior of the instrume!it.
NOTE:
There is suficient Space Online performance est record for laping printed lost results. This reduces the allow of recording requiroul throughout the resting process.
5.3. RECOMMENDED TEST EQUIPMENT.
5.. The recommended equipment for these performance costs is listed in Table 5-1. Equin. ment that satistics or exceeds the required characteristics given in the table may be Substituted for the recommended models,
Table 5-1. Recommended Performance Test Equipment,
Instrument Type
Required Characleristics
Recomnianded Madel
AC Colibrator/ High Voltogo Amplifier
np. 745A/746A
Frequency: 20 Hz to 100 kHz. Qutput: 1 OmV lo 1000V Accuracy imid band); 0.100
DC Standard
Output: 1 mV to 1000 V Accurucy: + 0.0200
.hp. 740B W/11055B
Electronic Counter
Frequency: 50 and 60 Hz Accuracy: I 0.0140
-hp- 5300A/6302A
Resistor Decode Box
117, 101, 1000, 1k!), 100k und 1 MO steps Accuracy: 10.00590
Generol Radio MAI GR 1433.H
Resistors
100.6 .1; 6000 1100
Ik # 100 i Okn + 10, 10k + 0.0140 20,5210 Turn Potentiometer 10M 0.100 600N 100
p0811-1647 -hp.0757-1100 -hp- 0727.0751 -hp-0811-3234 hp 08111185 -hp. 2100-3484 -hp- 0698-8194 hp- 0757-1100
5-1
L
.
l li
::!
.
.
Performance Tenis
Model 34671
5.5. TESTING MULTI-CHANNEL INSTRUMENTS.
5-67. Testing all our channel for each pecification is not restry. Alter ivrilying com. tinuils Online Tour inpull channels the remaining performance Test need li perturned only on the channel iniuuled (enerally channel 3 with fills the main reference), Warstville Channels are listed where applicabile,
5.7. OPERATIONAL VERIFICATION,
5-8, The Operational Verilicntion is it shortened version of the lull performee . This verilication checks the most critical, changeable speellications and is useful for incoming in. spections where full testing may not be desired. An operillion) verification record is provided in the end of this section for your convenience in recording test results. This record my h eproduced withoui permission from Hewlett-Packard.
5.9. PERFORMANCE TESTS.
5-10. Logging Multimeter performance tesis are presented in the following order:
1. Continuity check b. Temperature measurement accuracy IES C DC voltmeier accuracy test d. AC voltmeter dicuracy test c. O meter accuracy test fi AC normal mode refuction list
. AC common mode rejection test II. Scanner Isolation test
5.11. Continuity Check.
5-12. This check is required to verify continuity from the channel input terminals to the Scanner common terminals. This allows the logging Multimeter performance tests to be per. formed only on a selected channel to reduce testing lima.
5-13. Procedure: (Perform also as part of Operational Verilicution).
.
!
a. Set the logging Multimeter lo the ha lunction, autorming,
b, Select all four channels,
C. Verify that the Lugging Multimeter overloads on all four channels. Amount print will obiain a record of this,
!! i 1 ii ii. ...
d. Short all four channel flipu Hi and 1.O terminats logether.
1.51. Amanual
0. Verily that the magnitude of the reading on all four channels are < print will obtain a record of this,
NOTE:
This verifies a channel resistance within 1.512 of the turn-on 01/07 01492. Negative turn-on rallies are possible.
5-2


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