4 Performance Verification Tests
74 Keysight 3458A Calibration Manual
4-wire ohms function gain test
The following is a step-by-step procedure for all test points that performance
verify gain of the ohms function. The procedure requires alternately connecting
the transfer standard DMM and then the 3458A under test to the resistance
verification source as described in the section titled General test procedure.
1 Connect the resistance standard to the transfer standard DMM 4-wire ohms
front input terminals.
2 Set the range of the transfer standard DMM as specified in Table 4-6.
3 Set the range of the 3458A under test as specified in Table 4-6.
4 Set the resistance standard to the ohms level specified in Table 4-6.
5 Execute Trig and read the output of the resistance standard as measured with
the transfer standard DMM and record this reading in the “Transfer standard
reading” column of the OHMS TESTS Test Card.
6 Remove the connection from the transfer standard DMM to the resistance
standard.
7 Connect the resistance standard to the front panel 4-wire ohms input
terminals of the 3458A under test.
8 Execute Trig two times and read the value as measured with the
3458A under test and record this value in the “Unit under test reading” column
of the OHMS TESTS Test Card.
9 Repeat steps 1 through 8 for each of the remaining resistance test points as
specified in Table 4-6.
Table 4-6 OHMF gain performance tests
OHMF gain test number Source and DMM range Source output
1 10 W 10 W
2 100 W 100 W
31 kW 1 kW
4 10 kW 10 kW
5 100 kW 100 kW
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