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What is the purpose of calibrating the DATRON INSTRUMENTS 1062?
The purpose of calibration on the DATRON INSTRUMENTS 1062 is to take account of any long-term drifts in the components of the instrument and to restore the accuracy, making it traceable to a known standard.
The period between calibrations depends upon the accuracy performance required from the instrument and for guidance, guaranteed accuracies for 24 hours, 90 days and 1 year are quoted.
What are the essential conditions for a good calibration on the DATRON INSTRUMENTS 1062?
For a good calibration of the DATRON INSTRUMENTS 1062, the following conditions are essential:
Temperature: So that the instrument can meet its specification over the quoted temperature range, the temperature environment should be stabilized at 23°C ± 1°C. In addition, temperature gradients around the instrument should be considered, therefore calibrate the instrument in its normal operating position and allow plenty of room for ventilation.
Warm up: It is essential that the instrument has fully temperature stabilized if the best results from calibration are to be achieved. Therefore, at least a 2 hour warm up period is recommended, during which time the line supply to the console should not be removed, even for a short period. In addition, if the covers have been removed, make certain that they are correctly fitted and that the leaf contacts to the Earth and Guard Shields are in good shape.
Calibration Source: To perform a useful calibration the accuracy of the source should always be at least four times that of the instrument being calibrated. In most cases, examples of likely sources are given for each calibration function.
Guarding: It is preferable to arrange for the DVM to be ‘calibrated with Local Guard’ selection. Furthermore to 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 examples are shown in the Operating Manual.
How does the ‘AUTOCAL’ process work on the DATRON INSTRUMENTS 1062?
The Datron ‘AUTOCAL’ process on the DATRON INSTRUMENTS 1062 means that complete calibration of AC/DC, Ohms and Current on every range can be carried out from the instrument’s own front panel. In the process, an internal non-volatile memory 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 devided 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.
How do I perform an ‘AUTOCAL’ on the DATRON INSTRUMENTS 1062?
To perform an ‘AUTOCAL’ on your DATRON INSTRUMENTS 1062, follow this procedure:
1. Access to the non-volatile memory is gained using a key inserted into the rear panel. When calibration is complete, the key is removed, therefore preventing accidental or unauthorized use of the calibration routine.
2. Select the ‘FUNCTION’ and ‘RANGE’ to be calibrated and cancel any ‘MODE’ or ‘COMPUTE’ buttons.
3. 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.)
4. Connect the calibration source to the input terminals and operate the keys shown 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 do the ‘AUTOCAL’ keys on the DATRON INSTRUMENTS 1062 do?
The five ‘AUTOCAL’ keys on the DATRON INSTRUMENTS 1062 perform 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 only has a significant effect on the low DC Voltage ranges and high resistance Ohms ranges. It can be operated as often as is 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 optimises 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 an ‘Error 4’ message during calibration mean on the DATRON INSTRUMENTS 1062?
During calibration of the DATRON INSTRUMENTS 1062, if ‘Error 4’ is displayed, this indicates that the calibration source has deviated 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 calibration key LED remains on.
In the case of ‘Zero’, ‘Gain’ or ‘AcHf’ the Calibration Source should be checked and the same ‘CALIBRATE’ key repressed. The ‘Hold’ mode may be released at any time and the instrument will be free to run again. If ‘Error 4’ follows ‘Ib’ or ‘Lin’ or persistently appears following ‘Zero’, ‘Gain’ or ‘AcHf’, then an instrument failure may have occurred.
What is the procedure for DC Voltage Calibration on the DATRON INSTRUMENTS 1062?
The procedure in the table below is all that is necessary to completely ‘AUTOCAL’ the DC Voltage function. Steps 1 and 2 affect the accuracy on all ranges and should therefore be carried out even if just one range is being calibrated. On each range a ‘Zero’ and ‘Gain’ calibration is required for each polarity of input. The two ‘Zero’ calibrations are included to overcome a possible zero difference with the polarity setting of the DC calibration source.
Equipment Required:
• 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.
DC Voltage Calibration Table:
| 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 | +0.000mV | 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 [ ].
What is the procedure for Ohms Calibration on the DATRON INSTRUMENTS 1062?
The procedure in the table below is all that is necessary to completely ‘AUTOCAL’ the Ohms function. If just the Ohms or just one range of the Ohms is to be calibrated, then steps 1 and 2 in the DC Voltage Calibration table should be carried out first. Then on each Ohms range just a ‘Zero’ and ‘Gain’ calibration is required.
Equipment Required:
• ‘Zero’ Resistance Source: For accurate ‘Zero’ calibration on Ohms it is ESSENTIAL that a correctly connected zero source is used. Two arrangements are shown in the provided PDF for different ranges (10Ω to 100kΩ and 1MΩ and 10MΩ). It can be seen that 4 wire ‘0’ selection is recommended on all ranges.
• 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.
Ohms Calibration Table:
| 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’ | ±0.0000Ω | Wait for the reading to stabilize before operating ‘Zero’ |
| 2 | 10Ω Full Range | 10Ω [1] Standard Resistor | kΩ, 4 wire, 10Ω | ‘Gain’ | 10.0000Ω ±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’ | ±0.0000MΩ (±0.00000MΩ) | |
| 14 | 10MΩ Full Range | 10MΩ [1] Standard Resistor | kΩ, 4 wire, 10MΩ Input Filter(2) | ‘Gain’ | 10.0000MΩ ±5 digits (10.00000MΩ) (±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 ( ).
What is the procedure for AC Voltage Calibration (Option 10) on the DATRON INSTRUMENTS 1062?
The procedure in the table below is all that is necessary to completely ‘AUTOCAL’ the AC voltage function. On each range just a ‘Zero’, ‘Gain’ and ‘AcHf’ calibration is required.
Equipment Required:
• A copper shorting link and an AC calibration source e.g. Datron 4200 Autocal AC Standard.
AC Voltage Calibration Table (Option 10 Only):
| Step | Calibration Operation | Calibration Source Output | DVM Setting | ‘CALIBRATE’ Key | DVM Reading After Calibration | Remarks |
|---|---|---|---|---|---|---|
| 1 | DC coupled AC Zero | Copper Shorting link | AC,DC,.1 | ‘Zero’ | 0.000mV ±3 digits | Set ‘Local Guard’. Do not set ‘Input filter’. Wait for reading to stabilize before operating ‘Zero’ |
| 2 | .1V Range Zero | Copper Shorting link | AC, .1 | Check only | <100 digits | |
| 3 | 1V Range Zero | Copper Shorting link | AC, 1 | ‘Zero’ | 0.0000V ±1 digit | |
| 4 | 10V Range Zero | Copper Shorting link | AC, 10 | ‘Zero’ | 0.0000V ±1 digit | |
| 5 | 100V Range Zero | Copper Shorting link | AC, 100 | ‘Zero’ | 0.000V ±1 digit | |
| 6 | 1000V Range Zero | Copper Shorting link | AC, 1000 | ‘Zero’ | 0.00V ±1 digit | |
| 7 | 10V Full Range LF | 10V rms 500 Hz | AC, 10 Input filter | ‘Gain’ | 10.0000V ±1 digit | Select ‘Input filter’ for remaining steps |
| 8 | 10V Full Range HF | 10V rms 30 kHz | AC, 10 Input filter | ‘AcHf’ | 10.0000V ±5 digits | |
| 9 | 1V Full Range LF | 1V rms 500Hz | AC, 1 Input filter | ‘Gain’ | 1.00000V ±1 digit | |
| 10 | 1V Full Range HF | 1V rms 30 kHz | AC, 1 Input filter | ‘AcHf’ | 1.00000V ±5 digits | |
| 11 | .1V Full Range LF | .1V rms 500 Hz | AC, .1 Input filter | ‘Gain’ | 100.000mV ±2 digits | |
| 12 | .1V Full Range HF | .1V rms 30 kHz | AC, .1 Input filter | ‘AcHf’ | 100.000mV ±5 digits | |
| 13 | 100V Full Range LF | 100V rms 500 Hz | AC, 100 Input filter | ‘Gain’ | 100.00V ±1 digit | |
| 14 | 100V Full Range HF | 100V rms 30 kHz | AC, 100 Input filter | ‘AcHf’ | 100.00V ±5 digits | |
| 15 | 1000V Full Range LF | 1000V rms 500 Hz | AC, 1000 Input filter | ‘Gain’ | 1000.00V ±1 digit | Lethal voltage present. Increase calibration source in 100V steps if possible. |
| 16 | 1000V Full Range HF | 1000V rms 20kHz | AC, 1000 Input filter | ‘AcHf’ | 1000.00V ±5 digits | Lethal voltage present. Increase calibration source in 100V steps if possible. DO NOT EXCEED 25 kHz. |
What is the procedure for DC Current Calibration on the DATRON INSTRUMENTS 1062?
The procedure in the table below shows all that is necessary to completely ‘AUTOCAL’ the DC Current function. If just the DC Current or just one range of the DC Current is to be calibrated, then step 11 or 14 of the DC Voltage Calibration table should be carried out first. Then on each current range just a ‘Zero’ and ‘Gain’ calibration is required.
Equipment Required:
• A DC Current calibration source. e.g. Datron 4000/4000A Autocal Standard with Option 20.
DC Current Calibration Table:
| 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 | 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’ | ±0.0000mA ±1 digit | |
| 4 | 1mA Full Range | +1.00000mA | DC, I, 1 | ‘Gain’ | +1.0000mA ±1 digit | |
| 5 | 10mA Range Zero | 0.0000mA | DC, I, 10 | ‘Zero’ | ±0.0000mA | |
| 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 |
What is the procedure for AC Current Calibration on the DATRON INSTRUMENTS 1062?
The procedure in the table below shows all that is required to completely ‘AUTOCAL’ the AC Current function. If just the AC Current or just one range of AC Current is to be calibrated, then steps 1, 2, 11 & 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.
Equipment Required:
• An AC Current calibration source at 1kHz. e.g. Datron 4200 Autocal AC Standard with option 30.
AC Current Calibration Table:
| 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 | 1A Full Range | 1A, 1kHz | I, DC, AC, 1000 | ‘Gain’ | 1000.00mA ±10 digits |
How do I use the ‘KEYBOARD’ method for calibration on the DATRON INSTRUMENTS 1062?
The ‘KEYBOARD’ method of calibration on the DATRON INSTRUMENTS 1062 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. The process is functional for a source with a magnitude of between 20% and 120% of the range selected, but it should be noted that an equal magnitude source error calibrated at the lower percentage end of range produces a higher percentage calibration error. The ‘KEYBOARD’ method operates for both the ‘Gain’ and ‘AcHf’ calibrations.
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 can I perform an ‘AUTOCAL’ over the bus on my DATRON INSTRUMENTS 1062?
To perform an ‘AUTOCAL’ on the DATRON INSTRUMENTS 1062 over the bus (e.g., IEEE Bus), the five calibration keys are replaced by five bus instructions. All other aspects of the calibration procedure, as listed in the calibration tables, remain the same.
When a bus calibration is required the address switch must be set to the address number assigned to the DVM in the system. More details of calibration with the bus are included in Section 1.8.
Example Program using the Bus:
The following program listing for the same calibration operation assuming an HP9825 controller is as follows:
0: dim D$[15]
1: clr 728
2: wrt 728,”F3R3Q1W1=”
3: G$→S
4: wrt 728,”G0=”
5: on 7,”srq”
6: eir 7,128
7: if bit (,”01XXXXXX”)S
8: dsp “Apply 1V & CONTINUE”
9: G1→S; sto
10: wrt 728,”G1=”
11: oni 7,”srq”
12: eir 7,128
13: if bit(,”01XXXXXX”)S
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 A0C0DXF3M0N0Q0R3W1S0T0 |
| 2 | Set DVM to DCV, 1V Range, and prepare for calibration | +0.00000V | Calibration key to ‘CAL’ | ‘F3R3Q1W1-‘ | — | Program DVM to Function DC (F3) Range 1V (R3) SRQ 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. | — | — | ‘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 my DATRON INSTRUMENTS 1062?
The DATRON INSTRUMENTS 1062 is set to 50Hz, 205V to 255V supplies unless Option 80, 81 or 82 is specified. To change the line voltage/line frequency may necessitate an instrument recalibration.
To change the line voltage, follow these steps:
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.
3. 230V Operation: Remove link LK1 and fit LK2 and LK3.
4. 115V Operation: Remove links LK2 and LK3, and fit LK1.
5. Amend instrument identification label.
6. Replace fuses with 160mA anti-surge (230V) or 300mA anti-surge (115V).
7. Carry out the Specification Verification tests and recalibrate if necessary.
How do I change the line frequency on my DATRON INSTRUMENTS 1062?
To change the line frequency of your DATRON INSTRUMENTS 1062, 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 and LK6 on the Digital assembly, Drawing No. 400329.
5. Place instrument into HOLD. Adjust L2 (Digital assembly) so that TP28 is 1.05V ±0.03V with respect to digital common (TP28).
NOTE: This signal contains about 200mV peak-to-peak high frequency noise.
6. Amend instrument identification label.
7. Replace the top cover.
8. Carry out the Specification Verification tests and recalibrate if necessary.
How do I replace the battery in my DATRON INSTRUMENTS 1062?
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 must 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 up instrument.
3. Desolder battery at end of tags and remove from clip.
4. Clip in with new battery (Datron Part No. 920019) positive terminal to resistor.
5. Replace top cover.
6. Amend instrument identification label (Current date + 5 years).
7. Carry out the Specification Verification tests and recalibrate if necessary.
What are the post-repair adjustment procedures for the Basic DC Instrument of the DATRON INSTRUMENTS 1062?
After a repair, the following adjustments should be made for the Basic DC Instrument components of the DATRON INSTRUMENTS 1062.
Equipment Requirements:
• 4½ digit Digital Voltmeter e.g. Datron 1041
• Variable 15V, 1A line 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 ±.25V.
3. Connect DVM Hi to TP1 and Lo to TP29 on the Analog assembly. Adjust R7 on the Rear (Power Supply) pcb assembly to give +15.000V ±.15V.
4. Connect DVM Hi to TP2 and Lo to TP20 on the Analog assembly. Adjust R12 on the Rear (Power Supply) pcb assembly to give -15.000V ±.15V.
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 4.750V ±.10V.
8. Set R63 fully clockwise. Connect oscilloscope Lo to TP28 and monitor M53 pin 40. Turn R63 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 TP28, Lo to TP28. Adjust scope trigger until the trace is triggered by the first pulse of each reading burst. 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. NOTE: This signal contains about 200mV peak to peak high frequency noise.
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. 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 the drift is in excess of 10 digits/°C R151 must be adjusted. If the drift was positive turn R151 anti-clockwise, if negative turn R151 anti-clockwise. Repeat from (i). Solder R151 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, 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 more. 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 reference value for FSV R11 or R15 to give a reading of 0V ± 1mV. 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 +18.9999 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 32-34 until both readings are within the limits indicated.
35. Turn rear panel keyswitch to RUN mode.
How do I perform the Ohms Assembly post-repair adjustments on the DATRON INSTRUMENTS 1062?
After a repair, the following adjustments should be made for the Ohms Assembly of the DATRON INSTRUMENTS 1062.
Equipment Required:
• 4½ digit DVM e.g. Datron 1060, 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 kilohm 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 is > +50μV, reselect FSV resistor R40 to bring the reading within limits. If reading is < -50μV, reselect FSV resistor R39 to bring the reading within limits. NB R39 and R40 must 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 setup procedure for the Option 10 AC Assembly on the DATRON INSTRUMENTS 1062?
After a repair, the following adjustments should be made for the Option 10 AC Assembly of the DATRON INSTRUMENTS 1062.
Equipment Required:
• 5mV/Div oscilloscope, e.g. Telequipment D83.
• 4½ digit DVM with Ohms, e.g. Datron 1060, 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:
1. Select AC 1000V range and HOLD. Short Hi to Lo. Connect DVM Hi to TL7, Lo to TP8 and note reading. Select 1V range and adjust R121 (bias current) to give same reading ±100μV.
2. Select 100mV range, AC + DC and adjust R112 (offset adjust) for an indication of zero ±50μV on the DVM.
3. Repeat steps 1. and 2. until readings are within the specified limits.
4. Select 10V range and HOLD. Connect oscilloscope Hi to TP5, Lo to TP8 and adjust R90 (rectifier zero) for maximum noise about zero. Remove the oscilloscope.
5. Connect DVM Hi to TP2, Lo to TP8 and adjust R75 (linearity) for an indication on the DVM of +3.157V ±0.01V.
6. Select AC, 1V range, FILTER and apply 1V 500Hz. Connect DVM Hi to TL5, Lo to TP8. If reading is +3.157V ±0.01V proceed to step 8.
7. Disconnect input signal and switch off instrument. Make link C TL1 to TL5 if open. Switch on instrument, reselect AC, 1V range, FILTER and apply 1V, 500Hz. Measure voltage on TL5. Consult Fig. 4.2 and cut links as indicated. Check voltage on TL5 is 3.157V ±0.01V. Remove the DVM.
8. Deselect HOLD and short circuit instrument Hi and Lo. Turn rear panel key switch to CAL mode and select ZERO. Repeat for all ranges.
9. Select 1V range, apply 1 volt (d.c.) and note reading (d.c.). Apply -1 volt (d.c.) and adjust R50 (d.c. turnover) for same display indication ±10 digits.
10. This part of the procedure must be performed with the high frequency compensation voltage, at J1-11/ TP7, at -5V ±0.2V. Select AC 100V range, FILTER and apply 100V, 500Hz. Select GAIN. Apply 100V, 50kHz and adjust C62 for a display of 100.000V ±20 digits.
11. Apply 1 volt 5:1 crest factor signal. Adjust R35 (crest factor) for a display of 1.00000V ±30 digits.
12. Open circuit input. Turn rear panel key switch to RUN. Select TEST and check for a display of PASS. Turn rear panel key switch to CAL.
13. Select 10V range and apply 10V, 50kHz. Check display is 10.0000V ±1200 digits. Check that the display can be calibrated to 10.0000 ±20 digits by less than 5 presses of the AC HF key.
14. Select 100mV range and apply 100mV, 50kHz. Check that display can be calibrated to 100.000mV ±20 digits by less than 5 presses of the AC HF key.
15. Select 1000V range and apply 1000V, 500Hz. Select GAIN.
16. Apply 1000V, 25kHz and check display is 1000.00V ±1200 digits. Check that display can be calibrated to 1000.00V ±20 digits by less than 5 presses of the AC HF key. Remove 1000V and turn rear panel key switch to RUN.
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