Measurement Tutorial 7
Keysight 34420A User’s Guide 281
Loading Errors Due to Input Bias Current (Leakage Current)
The semiconductor devices used in the input circuits of the meter have slight
leakage currents, called bias currents. The effect of the input bias current is an
loading error at the meter’s input terminals.
The leakage current will approximately double for every 10 °C temperature rise,
making the problem much more apparent at higher temperatures. You can adjust
the input bias current to remove these errors. The bias current is automatically
minimized during the zero calibration procedure (see Chapter 4 in the 34420A
Service Guide). You should perform the zero calibration procedure if you are
operating the meter at a temperature more than 5 °C from the calibration
temperature.
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