Measurement Tutorial 7
Keysight 34420A User’s Guide 275
Radio Frequency Interference
Most voltage measuring instruments can generate false readings in the presence
of large high frequency fields. Possible sources of such fields could include radio,
television, communication transmitters, and portable telephones. The high
frequency energy can couple into the meter on the input leads or cables
connected to the rear of the instrument. Keeping the test leads and rear panel
cables as far removed as possible from high frequency sources will minimize the
RFI interference.
RFI emissions from the meter meet international standards. If your application is
extremely sensitive to RFI radiated from the meter, use a common mode choke in
the input cable as shown.
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