Calibration Procedures 3
Keysight 34420A Service Guide 87
4 Set the calibrator to fixed range (2.2 Volt range on range lock) and O Volt
output.
5 Null the reading on the meter.
6 Set the calibrator to 1 Volt output. Adjust the calibrator output from nominal
by the divider ratio to produce a 1 mV input to the meter.
7 Verify the meter reading against the table below.
8 Repeat step 4 through step 7 using the calibrator 11 Volt range and applying a
10 V output to produce a 10 mV input on the meter.
Step 4, step 5 and step 6 should be performed quickly to minimize
thermal offsets.
You should repeat step 4 through step 8 several times and average the
results to reduce the effects of measurement noise.
Table 3-3 1 mV and 10 mV gain verification procedure
± Error From Full Scale
Function/Channel Range 24 hour 90day 1 year
Voltage/ Channel 1 1 mV 45nV 60 nV 70 nV
Voltage/ Channel 1 10mV 270nV 420 nV 530nV
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