Radio Frequency Interference
Most voltage measuring instruments can generate false readings in the
presense 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 inteference.
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.
Torroid
Chapter 7 Measurement Tutorial
Measurement Techniques and Sources of Error
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