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What are the essential requirements for a good calibration of the DATRON INSTRUMENTS 1061A?
To ensure the DATRON INSTRUMENTS 1061A meets its specification over the quoted temperature range, the following conditions should be met for a good calibration:
Temperature: The instrument should be calibrated at 23°C ±1°C. If this temperature cannot be maintained, consideration should be given to calibrating the instrument in its normal operating position and allowing plenty of room for ventilation.
Warm-up: It is essential that the instrument is fully temperature stabilized to achieve the best results from calibration. A warm-up period of at least 2 hours is recommended, during which time the main supply should not be removed even for short periods. If the covers have been removed, ensure they are correctly fitted and that the leaf contacts to the Earth and Guard Shields are in good shape.
Calibration Source: A useful calibration source should have an accuracy that is at least four times better than that of the instrument being calibrated. In most cases, the stability of the source is more important than its absolute accuracy, for example, during DC Voltage calibration. With some calibration sources, the output may take several seconds to settle to a final value. Therefore, unless a shorter settling time is assured, a period of 10 seconds is recommended before each calibration operation.
Guarding: It is preferable to arrange for the DVM to be calibrated with Local Guard selected. Furthermore, arrange for the ‘Lo’ terminal of the DVM to be at ‘Earth’ throughout and let the calibration source float. If a ‘Remote Guard’ connection is necessary, then these examples are shown in the Operating Manual.
How does the ‘AUTOCAL’ process work on the DATRON INSTRUMENTS 1061A?
The DATRON INSTRUMENTS 1061A ‘AUTOCAL’ process allows for a complete calibration of all AC and DC, Ohms and Current on every range to be carried out from the instrument’s own front panel. The process involves an internal non-volatile memory that stores calibration constants for each function and range, as determined when the instrument takes a series of 16 readings of the applied calibration source. Internally, each of the readings is divided by one-sixteenth of a digit, and when the average is taken, the instrument is able to resolve to better than one least significant digit displayed.
Access to the non-volatile memory is gained using a key inserted into the rear panel. When calibration is complete, the key is removed, thereby preventing accidental or unauthorized use of the calibration routine.
How do I perform an ‘AUTOCAL’ on the DATRON INSTRUMENTS 1061A?
To perform the ‘AUTOCAL’ process, follow this procedure outline:
1. Select the ‘FUNCTION’ and ‘RANGE’ to be calibrated and cancel any ‘MODE’ or ‘COMPUTE’ buttons.
2. Insert the key into the ‘CALIBRATE ENABLE’ keyswitch on the rear panel and turn to the ‘CAL’ position. (The ‘cal’ legend will be displayed on the front panel.)
3. If the instrument is fitted with Option 50 IEEE Bus, set the rear panel address switch to 31, i.e., all 1’s.
4. Connect the calibration source to the input terminals and operate the keys in the tables in the following pages. When a ‘CALIBRATE’ button is operated, its associated L.E.D. indicator will light and extinguish when the calibration operation is executed.
5. When all calibration is complete, turn the keyswitch to ‘RUN’ and remove the key.
What are the functions of the five ‘AUTOCAL’ keys on the DATRON INSTRUMENTS 1061A?
The DATRON INSTRUMENTS 1061A has five ‘AUTOCAL’ keys with the following functions:
‘Zero’: This takes account of offsets in the instrument and in the calibration source.
‘Gain’: This sets a scaling factor for each range and function.
‘Ib’: This nulls the input bias current of the DC Voltage measurement circuitry to around 10pA. Therefore, it has a significant effect on the low DC Voltage ranges and high resistance Ohms ranges. It can be operated as often as required and independently of other calibration operations. It will be seen that successive operations of ‘Ib’ approach the final nulled value of current iteratively.
‘AcHf’: This flattens the response of the A.C. amplifier used for AC voltage measurement. It should only be used when a full calibration (i.e. ‘Zero’, ‘Gain’, and ‘AcHf’) is carried out. As with ‘Ib’, the calibration action is iterative and requires several operations of the key to complete.
‘Lin’: This is an important calibration operation as it optimizes the basic linearity of the internal measurement circuitry used for all ranges and functions. It must be used before any DC Voltage or Ohms calibration is carried out.
What does ‘Error 4’ indicate during calibration of the DATRON INSTRUMENTS 1061A?
If ‘Error 4’ is displayed during calibration of the DATRON INSTRUMENTS 1061A, it indicates that the calibration source deviates too far from the calibration span of the instrument. Under these circumstances, the calibration memory is not updated, and the instrument goes into ‘Hold’ with the calibration button and calibration key LED remaining on.
In the case of ‘Zero’, ‘Gain’, or ‘AcHf’, the Calibration Source should be checked, and the same ‘CALIBRATE’ key pressed again. If ‘Error 4’ follows any release of any ‘CALIBRATE’ key, this indicates a possible instrument failure. If ‘Error 4’ follows ‘Ib’ or ‘Lin’ or persistently appears following ‘Zero’, ‘Gain’, or ‘AcHf’, then an instrument failure may have occurred.
How do I perform a DC Voltage Calibration on the DATRON INSTRUMENTS 1061A?
To perform a DC Voltage Calibration on the DATRON INSTRUMENTS 1061A, you will need the following equipment:
• 1MΩ ‘Lin’ Source. This is a 1MΩ 5% resistor in parallel with a 1nF capacitor, shielded to reduce noise interference.
• 10MΩ ‘Ib’ Source. This is a 10MΩ 5% resistor in parallel with a 1nF capacitor, shielded to reduce noise interference.
• A DC Calibration Source. e.g. Datron 4000/4000A Autocal Standard.
Follow the steps in the table below to complete the ‘AUTOCAL’ for the DC Voltage function. On each range a ‘Zero’ and ‘Gain’ calibration is required. For each polarity of input, two ‘Zero’ calibrations and one ‘Gain’ calibration are included to overcome a possible zero offset in the DC calibration source.
| Step | Calibration Operation | Calibration Source Output | DVM Setting | ‘CALIBRATE’ Key | DVM Reading After Calibration | Remarks |
|---|---|---|---|---|---|---|
| 1 | Linearity | 1MΩ Lin Source | DC, 1 Filter(1) | ‘Lin’ | <10 digits (<100 digits) | This calibration step may take around 30 seconds to complete |
| 2 | Input Bias Current | 10MΩ Ib Source | DC, 1 | ‘Ib’ | <100 digits | Each subsequent operation of ‘Ib’ should approximately halve the DVM reading |
| 3 | 10V Range Zero | +0.0000V | DC, 10 | ‘Zero’ | ±0.0000V | |
| 4 | 10V Positive Full Range | +10.0000V | DC, 10 | ‘Gain’ | +10.0000V | |
| 5 | 10V Range Zero | -0.0000V | DC, 10 | ‘Zero’ | ±0.0000V | |
| 6 | 10V Negative Full Range | -10.0000V | DC, 10 | ‘Gain’ | -10.0000V | |
| 7 | 1V Range Zero | +0.00000V | DC, 1 | ‘Zero’ | ±0.00000V | |
| 8 | 1V Positive Full Range | +1.00000V | DC, 1 | ‘Gain’ | +1.00000V | |
| 9 | 1V Range Zero | -0.00000V | DC, 1 | ‘Zero’ | ±0.00000V | |
| 10 | 1V Negative Full Range | -1.00000V | DC, 1 | ‘Gain’ | -1.00000V | |
| 11 | .1V Range Zero | +0.000 mV | DC, .1 | ‘Zero’ | ±0.000mV ±1 digit | Wait for the reading to stabilize before operating ‘Zero’ |
| 12 | .1V Positive Full Range | +100.000mV | DC, .1 | ‘Gain’ | +100.000mV ±1 digit | |
| 13 | .1V Range Zero | -0.000mV | DC, .1 | ‘Zero’ | ±0.000mV ±1 digit | Wait for the reading to stabilize before operating ‘Zero’ |
| 14 | .1V Negative Full Range | -100.000mV | DC, .1 | ‘Gain’ | -100.000mV ±1 digit | |
| 15 | 100V Range Zero | +0.000V | DC, 100 | ‘Zero’ | ±0.000V | |
| 16 | 100V Positive Full Range | +100.000V | DC, 100 | ‘Gain’ | +100.000V | |
| 17 | 100V Range Zero | -0.000V | DC, 100 | ‘Zero’ | ±0.000V | |
| 18 | 100V Negative Full Range | -100.000V | DC, 100 | ‘Gain’ | -100.000V | |
| 19 | 1000V Range Zero | +0.00V | DC, 1000 | ‘Zero’ | +0.00V | |
| 20 | 1000V Positive Full Range | +1000.00V | DC, 1000 | ‘Gain’ | +1000.00V | Lethal voltages present. Increase calibration source in 100V steps if possible. |
| 21 | 1000V Range Zero | -0.00V | DC, 1000 | ‘Zero’ | ±0.00V | |
| 22 | 1000V Negative Full Range | -1000.00V | DC, 1000 | ‘Gain’ | -1000.00V | Lethal voltages present. Increase calibration source in 100V steps if possible. |
[1] For 1061A, Input Filter increases resolution by 1 digit – 1061A tolerance given in brackets ().
How do I perform an Ohms Calibration on the DATRON INSTRUMENTS 1061A?
The procedure in the table below is all that is necessary to completely ‘AUTOCAL’ the Ohms function on the DATRON INSTRUMENTS 1061A. For accurate ‘Zero’ calibration on Ohms, it is essential that a correctly connected zero source is used. Two arrangements are shown in Fig. 1.1; it can be seen that 4 wire ‘0’ selection is recommended on all ranges.
You will need a set of resistance standards from 10Ω to 10MΩ in decades. It is essential that 10Ω to 100kΩ standards are 4 terminal devices. e.g. Datron 4000/4000A Autocal Standard with Option 20.
| Step | Calibration Operation | Calibration Source | DVM Setting | ‘CALIBRATE’ Key | DVM Reading After Calibration | Remarks |
|---|---|---|---|---|---|---|
| 1 | 10Ω Range Zero | 4 wire zero | kΩ, 4 wire, 10Ω | ‘Zero’ | ±0.000Ω ±1 digit | Wait for the reading to stabilize before operating ‘Zero’ |
| 2 | 10Ω Full Range | 10Ω [1] Standard Resistor | kΩ, 4 wire, 10Ω | ‘Gain’ | 10.000Ω ±1 digit | |
| 3 | .1kΩ Range Zero | 4 wire zero | kΩ, 4 wire, .1 | ‘Zero’ | ±0.000Ω | |
| 4 | .1kΩ Full Range | 100Ω [1] Standard Resistor | kΩ, 4 wire, .1 | ‘Gain’ | 100.000Ω | |
| 5 | 1kΩ Range Zero | 4 wire zero | kΩ, 4 wire, 1 | ‘Zero’ | ±0.0000kΩ | |
| 6 | 1kΩ Full Range | 1kΩ [1] Standard Resistor | kΩ, 4 wire, 1 | ‘Gain’ | 1.00000kΩ | |
| 7 | 10kΩ Range Zero | 4 wire zero | kΩ, 4 wire, 10 | ‘Zero’ | ±0.0000kΩ | |
| 8 | 10kΩ Full Range | 10kΩ [1] Standard Resistor | kΩ, 4 wire, 10 | ‘Gain’ | 10.0000kΩ | |
| 9 | 100kΩ Range Zero | 4 wire zero | kΩ, 4 wire, 100 | ‘Zero’ | ±0.000kΩ | |
| 10 | 100kΩ Full Range | 100kΩ [1] Standard Resistor | kΩ, 4 wire, 100 | ‘Gain’ | 100.000kΩ | |
| 11 | 1000kΩ Range Zero | 4 wire zero | kΩ, 4 wire, 1000 Input Filter(2) | ‘Zero’ | ±0.00kΩ (±0.000kΩ) | |
| 12 | 1000kΩ Full Range | 1000kΩ [1] Standard Resistor | kΩ, 4 wire, 1000 Input Filter(2) | ‘Gain’ | 1000.00kΩ ±5 digits (1000.000kΩ) (±10 digits) | |
| 13 | 10MΩ Range Zero | 4 wire zero | kΩ, 4 wire, 10MΩ Input Filter(2) | ‘Zero’ | ±0.000MΩ (±0.0000MΩ) | |
| 14 | 10MΩ Full Range | 10MΩ [1] Standard Resistor | kΩ, 4 wire, 10MΩ Input Filter(2) | ‘Gain’ | 10.000MΩ ±5 digits (10.0000MΩ) (±50 digits) |
[1] – With Standard Resistor sources it may be useful to use the ‘KEYBOARD’ method of calibration – see section 1.7
[2] – For 1061A, Input Filter increases resolution by 1 digit, so 1061A figures are given in brackets ().
How do I perform an AC Voltage Calibration on a DATRON INSTRUMENTS 1061A with Option 12?
To perform an AC Voltage Calibration on the DATRON INSTRUMENTS 1061A with Option 12, you will need a copper shorting link and an AC calibration source, such as the Datron 4200 Autocal AC Standard. The procedure below is necessary to completely ‘AUTOCAL’ the AC voltage function. On each range, a ‘Zero’, ‘Gain’, and ‘AcHf’ calibration is required. To reduce the effect of noise at low input levels, AC zero calibration is carried out with a 0.1% Range; and for 100mV Range zero (steps 1 & 2 of the table), Guard is connected to Lo using a copper shorting link.
| Step | Calibration Operation | Calibration Source Output | DVM Setting | ‘CALIBRATE’ Key | DVM Reading After Calibration | Remarks |
|---|---|---|---|---|---|---|
| 1 | DC coupled AC Zero | 0.100mV 500Hz (short Guard to Lo) | AC,DC,.1 | ‘Zero’ | 0.100mV ±10 digits | Set ‘Local Guard’. Do not set filter in. Wait for reading to stabilize before operating ‘Zero’ |
| 2 | .1V Range Zero | Short Hi to Lo & Guard | AC,.1 | Check only | <=100 digits | |
| 3 | 1V Range Zero | 0.00100V 500Hz | AC,1 | ‘Zero’ | 0.00100V ±1 digit | |
| 4 | 10V Range Zero | 0.0100V 500Hz | AC,10 | ‘Zero’ | 0.010,0V ±1 digit | |
| 5 | 100V Range Zero | 0.100V 500Hz | AC,100 | ‘Zero’ | 0.100V ±1 digit | |
| 6 | 1000V Range Zero | 1.00V 500Hz | AC,1000 | ‘Zero’ | 1.00V ±1 digit | |
| 7 | 10V Full Range LF | 10V rms 500Hz | AC,10 | ‘Gain’ | 10.00,0V ±1 digit | |
| 8 | 10V Full Range HF | 10V rms 30kHz | AC,10 | ‘AcHf’ | 10.00,0V ±10 digits | |
| 9 | 1V Full Range LF | 1V rms 500Hz | AC,1 | ‘Gain’ | 1.000,00V ±1 digit | |
| 10 | 1V Full Range HF | 1V rms 30kHz | AC,1 | ‘AcHf’ | 1.000,00V ±10 digits | |
| 11 | .1V Full Range LF | .1V rms 500Hz | AC,.1 | ‘Gain’ | 100.000mV ±2 digits | |
| 12 | .1V Full Range HF | .1V rms 30kHz | AC,.1 | ‘AcHf’ | 100.000mV ±10 digits | |
| 13 | 100V Full Range LF | 100V rms 500Hz | AC,100 | ‘Gain’ | 100.00V ±1 digit | |
| 14 | 100V Full Range HF | 100V rms 30kHz | AC,100 | ‘AcHf’ | 100.00V ±10 digits | |
| 15 | 1000V LF Range Gain | 500V rms 500Hz | AC,1000 ‘KEYBOARD 500V’ then ‘Gain’ | 500.00V ±1 digit | Lethal voltage present – increase calibration source in 100V steps if possible. DO NOT EXCEED 75kHz. | |
| 16 | 1000V HF Range Gain | 500V rms 20kHz | AC,1000 ‘KEYBOARD 500V’ ‘AcHf’ | 500.00V ±15 digits | Lethal voltage present – increase calibration source in 100V steps if possible. DO NOT EXCEED 25kHz. |
How do I perform a DC Current Calibration on the DATRON INSTRUMENTS 1061A?
To perform a DC Current Calibration on the DATRON INSTRUMENTS 1061A (if Option 12 is fitted), you will need a DC Current calibration source, such as the Datron 4000/4000A Autocal Standard with Option 20. The procedure in the table below is necessary to completely ‘AUTOCAL’ the DC Current function. If just the DC Current or just one range of DC Current is to be calibrated, start at step 11 or 14 of the DC Voltage Calibration table, which should be carried out first. Then on each range, just a ‘Zero’ and ‘Gain’ calibration is required.
| Step | Calibration Operation | Calibration Source Output | DVM Setting | ‘CALIBRATE’ Key | DVM Reading After Calibration | Remarks |
|---|---|---|---|---|---|---|
| 1 | .1mA Range Zero | 0.000µA | DC,I,.1 | ‘Zero’ | ±0.000µA ±1 digit | Do not select ‘Input filter’ |
| 2 | .1mA Full Range | +100.000µA | DC,I,.1 | ‘Gain’ | +100.000µA ±2 digits | |
| 3 | 1mA Range Zero | 0.00000mA | DC,I,1 | ‘Zero’ | ±0.00000mA ±1 digit | |
| 4 | 1mA Full Range | +1.00000mA | DC,I,1 | ‘Gain’ | +1.00000mA ±1 digit | |
| 5 | 10mA Range Zero | 0.0000mA | DC,I,10 | ‘Zero’ | ±0.0000mA ±1 digit | |
| 6 | 10mA Full Range | +10.0000mA | DC,I,10 | ‘Gain’ | +10.0000mA | |
| 7 | 100mA Range Zero | 0.000mA | DC,I,100 | ‘Zero’ | ±0.000mA | |
| 8 | 100mA Full Range | +100.000mA | DC,I,100 | ‘Gain’ | +100.000mA | |
| 9 | 1000mA Range Zero | 0.00mA | DC,I,1000 | ‘Zero’ | ±0.00mA | |
| 10 | 1000mA Full Range | +1000.00mA | DC,I,1000 | ‘Gain’ | +1000.00mA |
How do I perform an AC Current Calibration on the DATRON INSTRUMENTS 1061A?
To perform an AC Current Calibration on the DATRON INSTRUMENTS 1061A (in conjunction with Option 10), you will need an AC Current calibration source at 1kHz, such as the Datron 4200 Autocal AC Standard with option 30. The procedure in the table below will completely ‘AUTOCAL’ the AC Current function. If only the AC Current or just one range is to be calibrated, then steps 1, 2, 11, and 12 of the Option 10 AC Voltage Calibration table must be carried out first. Then on each range, just a ‘Zero’ and ‘Gain’ calibration is required.
| Step | Calibration Operation | Calibration Source Output | DVM Setting | ‘CALIBRATE’ Key | DVM Reading After Calibration | Remarks |
|---|---|---|---|---|---|---|
| 1 | DC coupled AC Zero | No connections to DVM input terminals | I,DC,AC,.1 | ‘Zero’ | 0.00µA ±5 digits | Do not select ‘Input filter’ |
| 2 | .1mA Range Zero | “ | I,AC,.1 | Check only | <±100 digits | Cancel DC coupled |
| 3 | 1mA Range Zero | “ | I,DC,AC,1 | ‘Zero’ | 00000mA ±5 digits | |
| 4 | 10mA Range Zero | “ | I,DC,AC,10 | ‘Zero’ | 0.0000mA ±5 digits | |
| 5 | 100mA Range Zero | “ | I,DC,AC,100 | ‘Zero’ | 0.000mA ±5 digits | |
| 6 | 1000mA Range Zero | “ | I,DC,AC,1000 | ‘Zero’ | 0.00mA ±5 digits | |
| 7 | .1mA Full Range | 100µA, 1kHz | I,DC,AC,.1 | ‘Gain’ | 100.000µA ±10 digits | |
| 8 | 1mA Full Range | 1mA, 1kHz | I,DC,AC,1 | ‘Gain’ | 1.00000mA ±10 digits | |
| 9 | 10mA Full Range | 10mA, 1kHz | I,DC,AC,10 | ‘Gain’ | 10.0000mA ±10 digits | |
| 10 | 100mA Full Range | 100mA, 1kHz | I,DC,AC,100 | ‘Gain’ | 100.000mA ±10 digits | |
| 11 | 1000mA Full Range | 1A, 1kHz | I,DC,AC,1000 | ‘Gain’ | 1000.00mA ±10 digits |
How do I use the ‘KEYBOARD’ for calibration on the DATRON INSTRUMENTS 1061A?
The ‘KEYBOARD’ method of calibration on the DATRON INSTRUMENTS 1061A is useful when a calibration source, although set to a nominal value, has known errors. In this situation, the known value of the calibration source can be entered into the DVM before the ‘AUTOCAL’ process is executed. This process is functional for a source of magnitude between 20% and 120% of the range selected, but it should be noted that an equal magnitude source error at calibration at the lower percentage end of range produces a higher percentage calibration error.
When using the ‘KEYBOARD’ method with Negative DC Voltage calibration sources, it is important NOT to enter a negative sign with the keyed-in source value. The instrument can determine the polarity of the source and update the appropriate calibration memory location.
Calibration Example using ‘KEYBOARD’
The example shown in the table below uses ‘KEYBOARD’ to calibrate the 1000V AC LF Range Gain at 500V (step 15 of the AC Voltage Calibration table for Option 12).
| Step | Calibration Operation | Calibration Source | DMM Setting | ‘CALIBRATE’ Key | DMM Reading After Calibration | Remarks |
|---|---|---|---|---|---|---|
| 1 | 1000V Range Zero | 1.00V rms 500Hz | AC,1000 | ‘Zero’ | 1.00V ±1 digit | |
| 2 | Set and Enter Source Value | 500.00V rms 500Hz | ‘KEYBOARD’ then 5,0,0,·,0,0 | 0 then +500.00 | Lethal voltage present. Increase Calibration Source in 100V steps if possible | |
| 3 | 1000V AC LF Range Gain Calibration | As above | ‘Gain’ | 500.00V ±1 digit |
How do I perform an ‘AUTOCAL’ over the bus (IEEE Bus) with the DATRON INSTRUMENTS 1061A?
All calibration procedures covered in this manual for the DATRON INSTRUMENTS 1061A can be carried out remotely using Option 50, the IEEE Bus. The five calibration keys are replaced by five bus instructions, and these are used instead of the ‘CALIBRATE’ keys listed in the calibration tables.
An example of a program listing for the same calibration operation assuming an HP9825 controller is as follows:
0: dim D$[15]
1: clr 728
2: wrt 728,”F3R3Q1W1=”
3: ø->$
4: wrt 728,”G0=”
5: on 7,”srq”
6: eir 7,128
7: if bit (,”01XXXXXX”S) ->jmp -1
8: dsp “Apply 1V & CONTINUE”
9: ø->$;stp
10: wrt 728,”G1=”
11: oni 7,”srq”
12: eir 7,128
13: if bit(,”01XXXXXX”S) ->jmp -1
14: wrt 728,”T0W0=”
15: lcl 728
16: stp
17: “srq”:rds(728)->S
18: red 728,D$
19: iret
*7717
Calibration Example using the Bus
| Step | Calibration Operation | Calibration Source | DVM Setting | Bus Controller Instruction | DVM Reading After Calibration | Remarks |
|---|---|---|---|---|---|---|
| 1 | Set DVM to known state | — | In Remote State | ‘Device Clear’ | — | Program DVM to predetermined state A0C0DXDF3M0N0Q0R3W1S0T0Y0Z0 |
| 2 | Set DVM to DCV, 1V Range, and prepare for calibration | +0.00000V | Calibration key to ‘CAL’ | ‘F3R3Q1W1=’ | — | Program DVM to Function DC V(F3) Range V (R3) SRO Mode 1 (Q1) Enable Cal. (W1) |
| 3 | 1V Range Zero | +0.00000V | In Remote State | ‘G0=’ | ±.00000V | Program ‘Zero’ cal., SRQ indicates when calibration operation completed |
| 4 | 1V Positive Full Range | +1.00000V | In Remote State | ‘G1=’ | +1.00000V | Program ‘Gain’ cal., SRQ indicates when calibration operation completed |
| 5 | Set DVM to Internal Trigger, Disable Cal. | — | In Remote State | ‘T0W0=’ | — | Program DVM to Internal Trigger (T0), Disable Cal. (W0) |
| 6 | — | In Local State, Calibration key to ‘RUN’ | ‘Local’ | — | DVM in normal mode, free-running |
How do I change the line voltage on the DATRON INSTRUMENTS 1061A?
To change the line voltage on your DATRON INSTRUMENTS 1061A, follow these steps. The instrument is factory set to 50Hz, 205V to 255V supplies unless Option 80, 81, or 82 is specified. This information is carried on the instrument identification label located on the rear panel. Alteration to a different line voltage/line frequency may necessitate an instrument recalibration.
1. Disconnect power and all signal input/output leads.
2. Locate the link(s) connecting the split primary on the printed circuit board in front of the toroidal line transformer, Fig. 2.1 and Drawing No. 400295.
3. 115V Operation – Remove LK1 (link 1) and fit LK2 and LK3.
4. 230V Operation – Remove links LK2 and LK3, and fit LK1.
5. Amend instrument identification label.
6. Replace fuse with 160mA anti-surge (230V) or 300mA anti-surge (115V).
7. Carry out the Specification Verification tests and recalibrate if necessary.
NOTE: Link(s) should be 22 SWG Tin.Cu wire with rubber sleeving.
How do I change the line frequency on the DATRON INSTRUMENTS 1061A?
To change the line frequency on your DATRON INSTRUMENTS 1061A, follow these steps:
1. Disconnect power and all signal input/output leads.
2. Remove the top cover.
3. 400Hz Operation – Remove link LK5 and fit LK21 on the Digital assembly, Drawing No. 400329.
4. 50/60Hz Operation – Remove link LK21 and fit LK5 on the Digital assembly, Drawing No. 400329.
NOTE: Place instrument into HOLD. Adjust L2 (Digital assembly) so that TP28 is 1.05V ±0.03V with respect to digital common (TP28). This signal contains about 200mV peak-to-peak high frequency noise.
5. Amend instrument identification label.
6. Replace the top cover.
7. Carry out the Specification Verification tests and recalibrate if necessary.
How do I replace the battery in the DATRON INSTRUMENTS 1061A?
The battery should be replaced on or before the date indicated on the rear panel instrument identification label. To retain the calibration memory, the instrument must be powered on during replacement. Therefore, great care should be taken due to voltages up to 260 volts being present inside the instrument.
1. Remove top cover and locate battery on the Digital assembly.
2. Power on instrument.
3. Desolder battery at end of tags and remove from clip. Replace with new battery (Datron Part No. 920019) positive terminal to resistor.
4. Replace top cover.
5. Amend instrument identification label (Current date + 5 years).
6. Carry out the Specification Verification tests and recalibrate if necessary.
What is the post-repair procedure for the Basic DC Instrument of the DATRON INSTRUMENTS 1061A?
After a repair to the Basic DC Instrument of the DATRON INSTRUMENTS 1061A, follow this procedure. Note that up to 260 volts is present inside the instrument. Personal contact with these points may result in injury.
Equipment Requirements:
• 4½ digit Digital Voltmeter e.g. Datron 1041
• Variable 15V, 1 Amp DC supply
• 5mV/Div Oscilloscope e.g. Telequipment D83
• 1MΩ,5%, resistor in parallel with 1nF capacitor
• 10MΩ,5%, resistor in parallel with 10nF capacitor
• DC Voltage Calibrator, e.g. Datron 4000/4000A Autocal Standard.
Procedure:
Power Supplies
1. Turn instrument on and allow 5 minutes warm-up period.
2. Connect DVM Hi to TP8 and Lo to TP28 on the Digital assembly. Adjust R2 on the Rear (Power Supply) pcb assembly to give +5.100V ±25mV.
3. Connect DVM Hi to TP1 and Lo to TP28 on the Analog assembly. Adjust R7 on the Rear (Power Supply) pcb assembly to give +15.000V ±15mV.
4. Connect DVM Hi to TP2 and Lo to TP28 on the Analog assembly. Adjust R12 on the Rear (Power Supply) pcb assembly to give -15.000V ±15mV.
Digital Assembly
5. Switch the instrument off and disconnect the power lead.
6. Isolate the Digital Board by removing the connectors along the centre panel (J1-J5).
7. Connect variable 5V supply and DVM Hi to TP8, Lo to TP28. Reduce supply to 4.950V ±10mV.
8. Set R83 fully clockwise. Connect oscilloscope to TP28 and monitor M57 pin 40. Turn R83 anti-clockwise until TP30 undergoes a high to low transition (or begins to pulse low).
9. Remove variable supply and reconnect items disconnected in steps 5 and 6. Disconnect the oscilloscope. Switch on the instrument.
10. Connect DVM Hi to battery positive terminal, Low to TP28. Check battery voltage is >2.5 volts.
11. Disconnect DVM and connect oscilloscope Hi to TP29, Lo to TP28. Adjust R11 so that the pulses occur every 5ms ± 0.5ms.
12. Place instrument into HOLD. Connect oscilloscope Hi to TP7. Adjust L2 to give a stable 1.05±0.03V.
Analog Assembly (DC Isolator Section)
16. Centralize R150 and R160.
17. Select 0.1V range DC with FILTER out. Apply a 10MΩ resistor between instrument Hi and Lo. Connect DVM Hi to TL8, Lo to TP20. Adjust FSV R152 with a small trim resistor (50ppm/°C) for a reading of <10mV, using R159 for fine adjustment.
18. Apply a short circuit across the input terminals and adjust R150 for a reading of <50µV at TP13.
19. Connect DVM Hi to TP33 and adjust R160 for a reading of <20µV.
20. Repeat steps 17 to 19 until readings are within specified limits.
21. Re-apply 10MΩ resistor across the input terminals. Note the reading on the front panel display (-A). Note the ambient temperature (+X°C). Place the instrument in a temperature controlled oven at approx 50°C without top cover and with power on. Leave the instrument for at least 1 hour then note the reading on the display (-B) and the temperature of the oven (+Y°C). Compute (B-A)/(Y-X) = Drift/°C. Remove instrument from oven and allow to stabilize, with power on ‘excellent for one hour’. If the drift was >10 digits/°C proceed to (xi). If drift was in excess of 10 digits/°C R151 must be adjusted. If the drift was positive turn R151 clockwise, if negative turn R151 anti-clockwise. Repeat from (i). Solder in R152, with a clean soldering iron.
22. Solder in R152, with instrument turned off.
Analog Assembly (A-D Converter)
23. Select 100V range and apply short circuit between Hi and Lo. Connect DVM Hi to TP7 or TP8, Lo to TP20. If reading is +6.42V ±0.03V proceed to step 25.
24. Switch off instrument and make positive reference links B & C, if cut i.e. the links alongside TP7. Switch on instrument and measure voltages on TP7 once again. Consult Fig. 4.1 and cut links as indicated. Repeat step 23.
25. Connect DVM Hi to TP8. If reading is -6.42V ± 0.03V proceed to step 27.
26. Switch off instrument and make negative reference links A to C, if cut i.e. the links alongside TP8 once again. Consult Fig. 4.1 and cut links as indicated. Repeat Step 25.
27. Select HOLD. Connect DVM Hi to TP9. Select correct R15 value for FSV ±1V or R16 to give a reading of 0V ± 2mV. Solder in resistor.
28. Deselect HOLD and disconnect DVM. Select 1000V range and apply +19mV. Connect oscilloscope Lo to TP21, Hi to TP5. Adjust R20 for noisy waveform at zero point.
29. Remove oscilloscope. Replace covers but do not replace screws. Select 1V, DC, filter out and apply 1MΩ across input terminals. Turn rear panel keyswitch to CAL mode and select Lin.
30. Select 1V range and apply 10MΩ across input terminals until display reads less than 50 digits.
31. Select 10V range, FILTER and apply short copper link across input terminals. Select ZERO.
32. Apply +10 volts and select GAIN. Repeat until display reads +10.0000 ± ½ digit.
33. Apply +19 volts. If the display reads within the limits +18.9990 to +19.0001, proceed to step 35.
34. Calculate E = (19 – displayed reading)/2. Re-apply +10 volts and adjust R23 for a displayed reading of 10 + E. Repeat steps 33-34 until both readings are within the limits indicated.
35. Turn rear panel keyswitch to RUN mode.
What is the post-repair procedure for the Ohms Assembly of the DATRON INSTRUMENTS 1061A?
After a repair to the Ohms Assembly of the DATRON INSTRUMENTS 1061A, follow this procedure:
Equipment Required:
• 5½ digit DVM e.g. Datron 1065, or 1061.
• 10 Megohm 5% resistor in parallel with a 10nF capacitor, e.g. Datron Part No. 400392.
• Copper shorting links, and a short wire link.
Procedure:
1. Select 10 kohm range, 4-wire. Connect I- to Ohms Guard, I+ to Hi, and 10 Megohm resistor between Hi and Lo.
2. Connect DVM Hi to TP4, Lo to TP1 and adjust R26 (bias current) for a reading of Zero ± 300µV.
3. Disconnect the 10 Megohm resistor, and connect a copper shorting link in its place between Hi and Lo.
4. Transfer DVM Hi from TP4 to TP14, and adjust R27 (Q10 offset) for Zero ± 50µV. N.B. Ensure that the DVM used for measurement is correctly zeroed!
5. Repeat steps 1-4 until the readings are within the specified limits.
6. Connect Lo to Ohms Guard. Connect a shorting link between TP1 and TP3.
7. Transfer DVM Hi from TP14 to TP13, and check that the reading is zero ± 50µV. If reading > ±50µV, reselect FSV resistor R40 to bring the reading within limits. If reading > ±50µV, reselect FSV resistor R39 to bring the reading within limits. N.B R39 and R40 must each be at least 100 kilohms.
8. Remove the link from TP1 and TP3. Disconnect the DVM leads, and the connections from the front panel.
What is the post-repair procedure for the Option 12 AC Assembly on the DATRON INSTRUMENTS 1061A?
After a repair to the Option 12 AC Assembly of the DATRON INSTRUMENTS 1061A, follow this procedure. Note that reversible polarity should commence with the HF autocal storage voltage close to the center of its span. To check this, select the 100V AC range and measure the DC voltage at J1-11 with respect to TP8. It is between +4V and +6V. If it is necessary to clear the calibrator stores, if outside these limits, the cal stores should be cleared as described in para 4.3.1 operations (13), (14) and (15).
Equipment Required:
• 5mV/Div oscilloscope, e.g. Telequipment D83.
• 5½ digit DVM with Ohms, e.g. Datron 1065, 1061.
• DC calibrator, e.g. Datron 4000 or 4000A.
• AC calibrator, e.g. Datron 4200.
• Asymmetric signal, 1V RMS, Crest Factor 5:1 ±0.02%, reversible polarity.
Procedure:
AC Preamplifier Zero
1. Apply and remove 1V AC. Remove any AC from the input.
2. Select short circuit input. Select AC + DC, 100mV range and HOLD.
3. Connect DVM Lo to TP8, Hi to Test link K (TLK). Adjust R148 (bias current) for a reading of zero, ±140µV.
4. Select 100mV range AC, and check that the reading is zero, ±140µV. It may be necessary to re-adjust R148 to obtain this value. If so, recheck operation 3.
5. Select each range in turn, and check that the DVM reading is within ±70µV of zero (except 100mV range ±140µV).
Set up RMS Converter
6. Select 10V range. Adjust R119 (Rectifier zero) for the most negative (or least positive) reading on the display.
7. Connect DVM to TLH. Adjust R101 (linearity) for a reading of +1.1mV±10%.
8. Apply short circuit to the input. Guard to Lo and select AC + DC range. Apply 1V 500Hz and perform GAIN autocal. Apply +1V DC and note the displayed reading. Apply -1V DC and note the displayed reading. Repeat (13) to (15) until all readings are the same to within ±20 digits. Select 100V range AC, apply 100V, 50kHz and perform GAIN autocal. Apply 100V, 50kHz and adjust C82 for a display reading of 100.000V ±20 digits. Apply 100V, 100kHz and note the reading error. Adjust C79 to give 5 times the error in the same direction. Repeat (17) and (18) until the 50kHz and 100kHz readings are separated by less than 20 digits. Select 1V range, AC, apply 1V, 500kHz and perform GAIN autocal. Apply 1V, 50kHz and adjust C84 for a display reading of 1.00000V ±20 digits. Select 1V range AC, apply 1V, 500Hz, and with the DVM still connected to TLH. Remake links TLC-TLF. Then, without connecting to TLH, refer to Fig. 4.2 and cut test links (x) as appropriate to give a DVM reading of 3.157V ±0.010V.
Set up Crest Factor
21. Apply 1VRMS, +ve 5:1 Crest Factor signal. Adjust R61 (crest factor) for a display reading of 1.00000V ±30 digits.
22. Apply 1VRMS, -ve 5:1 Crest Factor signal. Check that the reading is 1.00000V ±30 digits.
23. Apply 1V, 500Hz, and perform GAIN Autocal. Repeat (21) and (22) and until crest factor readings are within limits.
Linearity Checks
24. Select 1V range, AC + DC. Apply 1V DC and perform GAIN Autocal.
25. Apply 1.9V DC and adjust R27 value (Factory Selected Value – FSV) for a display reading of 1.90000V ±6 digits (reducing R27 increases reading).
26. Repeat (24) and (25) until both correct.
27. Select 1V range AC. Apply in turn 1V, 100mV, 10mV, at 500Hz and check that display reading is correct to within ±10 digits of the input voltage.
28. Apply open circuit input, set CAL/RUN switch to RUN, press Test and check for a display of ‘PASS’.
Output Buffer Check
29. Select 1V range, AC + DC no filter. Apply 1V DC and set CAL switch to RUN. Use the ‘A-B’ computation mode to null out the reading: press STORE, B, then (A-B).
30. Select filter, and leave to settle for at least 30 seconds. Check that the displayed reading is within ±50 digits of zero.
31. Repeat (28).
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