7Measurement Tutorial
274 Keysight 34420A User’s Guide
Cabling and
connection
related
Common Mode
Rejection
Reduce the series resistance or common mode voltage. 279
Meter
related
Loading Errors
The meter’s input resistance is > 10 GW for 1 mV to 10 V
ranges, 10 MW for 100 volt range.
280
Input Bias Current
(Leakage Current)
The meter’s measuring circuitry exhibits approximately
30pA of input bias current for ambient temperatures from
0°C to 30°C. Bias current will change at temperatures
different than those at which the meter was calibrated.
281
Injected Current
A circuit may or may not be sensitive to injected current
depending on the topology of circuit being measured by
the voltmeter, the impedance level of the circuit, and the
common mode or normal mode rejection of the meter.
281
Error Source Correction Page
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