Fluke 1732 Calibration Manual page 31

Additional Errors:
Influence by galvanic connection of sources
Type of Influence
Common Mode [1]
Voltage difference [2]
[1] Common Mode Voltage VCM = Voltage difference between LO potentials of AUX1 and AUX2
[2] Voltage difference Vdiff = difference of voltages VAUX1-VAUX2 with connected LO terminals
1. Connect the 4-pin connectors AUX 1 + (pin 1) to the 8846A INPUT HI.
2. Connect the 4-pin connectors AUX 1 – (pin 2) to the 8846A INPUT LO.
3. Connect the 173x AUX Adapter box AUX 1 + and AUX 2 + to the calibrator Normal HI
4. Connect the 173x AUX Adapter box AUX 1 – and AUX 2 – to the calibrator Normal LO.
5. Set the 8846A to DC V.
6. Apply the voltages in Table 17.
7. Verify that the AUX 1 readings are between the limits.
8. After the values are checked for AUX 1, move the 4-pin connectors leads to AUX 2; Pin 3 to the 8846A
INPUT HI; pin 4 connected to the 8846A INPUT LO.
9. Apply the voltages in Table 17. Verify that the AUX 2 readings are between the limits.
Table 17. AUX Input Adapter Verification
Calibrator Out DC Volts
100.000
500.000
990.000
The limit values account for input loading of a 10 MΩ input on the DMM compared to
2.92 MΩ impedance of the 173x Logger. The effective scale factor changes from
1000:1 to 741.01:1. The error on the output of the Auxiliary Input Adapter is
±(0.7 % + 270 μV).
10. When finished, set the calibrator to Standby.
173x Auxiliary Input Adapter Verification (1732/1734/1736/1738 Only)
Typical additional errors for measurements on galvanic-connected sources
2x Divider Inputs Divider Input/Direct Input
AUX1 or AUX2 AUX1 & AUX2
1000 V CAT III 1000 V CAT III
Input Input
1.5 % of VCM 3 % of VCM
0.7 % of Vdiff 1.5 % of Vdiff
Nominal Output Vdc
Aux Adapter
0.13495
0.67475
1.33601
Note
AUX1 or AUX2
max 30 V to
ground Input
30 ppm of VCM
15 ppm of Vdiff
Lower Limit Vdc
0.13374 0.13617
0.66976 0.67975
1.32639 1.34564
Logger/Monitor
2x Direct Inputs
AUX1 or AUX2
max 30 V to ground
Input
0.15 % of VCM
0.15 % of Vdiff
Upper Limit Vdc
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