3 Calibration Procedures
86 Keysight 34420A Service Guide
1 mV and 10 mV Gain Verification (Optional)
This optional procedure checks the “full scale” gain for the 1 mV and 10 mV
ranges. Because of the low voltage levels used to verify these ranges and the
inherent inaccuracies of multifunction calibrators at these levels, a voltage divider
is used to check these ranges.
1 mV and 10 mV gain verification procedure
1 Set the meter to the following configuration:
Channel 1 input
7 ½ digits (100 PLC)
Filters OFF
2 Connect the calibrator, resistive divider, and meter as shown.
3 Measure or calculate the divider ratio.
These ranges can only be verified. The gain calibrations for these ranges
are derived from the calibrations on the 100mV, JV, and 10 V ranges.
Calibrator
Meter
Source +
Sense +
Source -
Sense -
1 k
1
Isothermal
environment
HI
LO
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