3 Calibration Procedures
84 Keysight 34420A Service Guide
Gain Verification
This procedure is used to check the “full scale” reading calibration of the meter.
Verification checks are only performed for those functions, channels, and ranges
with unique gain calibration constants.
Gain Verification Procedure
1 Set the meter to the following configuration:
7 ½ digits (100 PLC)
Filters OFF
2 Read “Test Considerations” on page 78.
3 Connect a multifunction calibrator to the meter's input terminals using the low
thermal input cable provided (Keysight PN 34102A). Ensure the connector
coupling nut is properly tightened.
4 Allow 5 minutes for the input connections to temperature stabilize.
5 Select each function and range on the meter in the order shown in the table on
the next page. At each function and range apply a full scale (input with the
multifunction calibrator. Compare each measurement result to the test limits
shown in the table.
The 1 mV and 10 mV gain verification is an optional verification test (see
page 86). These range gains are internally derived from the 1OOmV, 1V,
and 1OV range calibrations.
Table 3-2 Gain Verification Procedure
± Error From Full Scale
Step# Calibrator Output Function/Channel Range 24 hours 90day 1 year
1 100mV Voltage/ Channel 1 100 mV 1.8 µV 3.4 µV 4.4 µV
2 1 V Voltage/ Channel 1 1 V 13 µV 29 µV 39 µV
Q 3 10 V Voltage/ Channel 1 10 V 30 µV 240 µV 340 µV
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