Calibration Procedures 3
Keysight 34420A Service Guide 81
Zero Offset Verification
This procedure verifies the zero performance of the meter. Verification checks are
only performed for those functions and ranges with unique zero calibration
constants. A low thermal 4-wire shorting plug is applied to the input of the meter
for these checks.
Zero Offset Verification Procedure
1 Set the meter to the following configuration for each function, channel, and
range in the table on the next page:
7 ½ digits (100 PLC)
Filters OFF
2 Read “Test Considerations” on page 78.
3 Apply the low thermal 4-wire shorting plug (Keysight PN 34103A) to the
meter's input terminal. Ensure the connector coupling nut is properly
tightened.
4 Allow 5 minutes for the thermal shorting plug and input connector to
temperature stabilize.
5 Select each function and range in the order shown in the table on the next
page. Compare each measurement result to the test limits shown in the table.
– Zero offset calibration using a multifunction calibrator is NOT possible.
– Use only the low thermal 4-wire shorting plug provided.
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