The ability to measure the low level signals in the presence of the power frequency at high levels especially at the lower test frequencies is difficult. The circuit below is a power filter that works with a 10X scope probe and 1MΩ oscilloscope input; it is designed to attenuate the power line frequency. This circuit will need to be calibrated or characterized to determine the insertion loss across the frequency range of the test. Note that using other than a 10X probe and 1MΩ input will yield different performance – calibrate your filter and observe component ratings – caution, high voltage circuit.
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Posted in: Did You Know? MIL-STD-461G