4.2.2 Set the reference divider controls as follows:
Std Cell Circuit switch to Open
Input Voltage switch to 100
Output Voltage switch to 100
Standard Cell Voltage Dials to Calibrated Value of DC
Transfer Standard
4.2.3 Set the controls on both null detectors as follows:
Operate–zero switch to Zero
Range switch to 10 mV
4.2.4 Connect the equipment as shown in figure 2.
4.2.5 Set operate–zero switch of both null detectors I and II to OPR, then adjust the zero control of each null
detector to obtain a null indication on the 10 V range as follows:
NOTE
To isolate, offset, and/or minimize unwanted voltage pick up, mainly thermoelectric voltages,
which may contribute to false indications, the null detectors shall be zeroed in the
operate–condition.
4.2.5.1 Lift and connect each positive () or Hi terminal of each voltage source (TI, Fluke 731A, and 332A or
332B) to each of its output negative (–) or Lo terminal.
4.2.5.2 Set the reference divider standard cell circuit switch to locked.
4.2.5.3 Adjust the zero control of each null detector for a zero (null) indication; then, set the null detectors
operate–zero switch to zero.
NAVAIR 17–20AQ–70
6
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