Operational Verification Tests 2
Keysight 3458A Calibration Manual 31
4-wire ohms function gain test
The following procedure verifies the gain of the ohms function. The 10 kW point is
used for internal electronic calibration using ACAL. The procedure requires
alternately connecting the transfer standard DMM and then the 3458A under test
to the resistance verification standard as described in the Chapter 4 section titled
General test procedure.
1 Connect the resistance standard to the transfer standard DMM 4-wire ohms
front input terminals.
2 Set the Terminals switch of both DMMs to the Front position.
3 Set the range of the transfer standard DMM to 10 kW (function = OHMF).
4 Set the range of the 3458A under test to 10 kW (function = OHMF).
5 Set the resistance standard to 10 kW.
6 Execute Trig from the front panel two times and read the value of the
resistance standard as measured with the transfer standard DMM and record
this reading in the “Transfer standard reading” column of the ohms gain
operational test card.
7 Remove the connection between the transfer standard DMM and the
resistance standard.
8 Connect the resistance standard to the 4-wire ohms input terminals of the
3458A under test.
9 Execute Trig from the front panel 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 4-wire ohms function gain operational test card.
10 Calculate and record in the column provided, the difference (absolute value)
between the transfer standard DMM reading and the unit under test reading
for the test.
11 If the difference calculated is greater than the specified limits, refer to
Chapter 3, "Adjustment Procedures", to make adjustments.
12 Disconnect the resistance standard from the 3458A input terminals.
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