Performance Verification Tests 4
Keysight 3458A Calibration Manual 75
10 After all OHMF gain tests have been performed, calculate and record in the
column provided, the difference (absolute value) between the transfer
standard DMM reading and the unit under test reading for each of the test
points.
11 If any of the differences calculated are beyond the specified limits, refer to
Chapter 3, “Adjustment Procedures” to make adjustments.
12 Disconnect the resistance standard from the 3458A input terminals.
61 MW 1 MW
7
[a]
10 MW 10 MW
[a] NOTE: At 10 MW, leakage current from the Sense leads introduce additional uncertainty in the measurement. This
uncertainty, however, is accounted for in the published performance test limit. For best accuracy and consistency
across calibration sites and environments, Test 7 can be performed using a 2-wire ohms measurement. The
performance test limit remains the same for both 4-wire and 2-wire measurements of 10 MW.
Table 4-6 OHMF gain performance tests
OHMF gain test number Source and DMM range Source output
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