Calibration Procedures 3
Keysight 34420A Service Guide 99
Gain Calibration
The meter stores new gain correction constants each time this procedure is
followed. The gain constants are calculated from calibration values entered and
from measurements made automatically by the meter.
The 1 mV and 10 mV ranges use an internally derived gain constant and do not
have a separate gain calibration. The 1 mV and 10 mV gain constants are based
upon measurements performed during the 100 mV, 1 V and 10 V gain calibrations.
Channel 1 gain is used for both channel 1 and channel 2. No separate channel 2
gain constants are stored.
Gain Adjustment Considerations
– The zero calibration procedure must have been recently performed before
beginning these gain adjustment procedures.
– When performing the 4-wire ohms gain adjustment, new gain constants are
also stored for the 2-wire ohms gain constants.
– Gain adjustments can be made with calibrator input values that are within 0.9
to 1.1 of Full Scale.
Gain Calibration Procedure
Perform the adjustments for each function only in the order shown.
1 Read “Test Considerations” on page 78.
2 Set the meter to the following configuration for each function, channel, and
range in Table 3-4:
7 1/2 digits (100 PLC)
Null OFF
Filters OFF
It is recommended that the calibration procedure be followed in the order
given here. If you are performing adjustments for an individual function,
perform the adjustments ONLY in the order shown.
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