4 Performance Verification Tests
62 Keysight 3458A Calibration Manual
5 If any of the offset readings are greater than the limits specified on the DC
VOLTAGE TESTS Test Card, the instrument should be adjusted. Refer to
Chapter 3, “Adjustment Procedures”, to make adjustments.
6 Remove the short from the front panel terminals.
DC voltage function gain test
The following is a step-by-step procedure for all test points that verify gain of the
DC voltage function. The procedure requires alternately connecting the transfer
standard DMM and then the 3458A under test to the DC voltage source as
described in the general test description.
1 Set the output of the DC voltage source to standby/off and short the HI and
LO output terminals of the source using a shorting strap.
2 Connect the leads of a shielded low-thermal EMF cable from the source output
terminals to the Input HI and LO terminals of the transfer standard DMM.
3 Connect the Guard terminal of the voltage source to the guard terminal of the
DMM.
4 Set the range of the DMM to 100 mV. Wait five minutes for the DMM to
thermally stabilize.
5 Set MATH NULL on the transfer standard DMM.
6 Execute Trig SGL to trigger the NULL reading.
7 Remove the EMF cable leads from the DMM and connect them to the HI and
LO Input terminals 3458A under test. Connect the Guard terminal of the
voltage source to the guard terminal of the 3458A under test.
8 Set the range of the 3458A under test to 100 mV. Wait five minutes for the
3458A under test to thermally stabilize.
9 Set MATH NULL on the 3458A under test and execute Trig SGL to trigger the
NULL reading
10 REMOVE THE SHORTING STRAP FROM THE VOLTAGE SOURCE HI and LO
OUTPUT TERMINALS.
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