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Question What is Normal Mode Noise? Solution Normal mode noise can occur as a result of common mode, electrostatic, or electromagnetic noise finding its way to the signal. In most cases, the noise is related to ac power lines. If so, it appears as a 50 Hz or 60 Hz sine wave added to the dc voltage that we want to measure. A filter can be used to reduce 50 Hz or 60 Hz noise, but the slow response of the filter will slow down the measurements speed. Filters also inject some errors of their own. TIP: The best way to eliminate power line noise is with an integrating voltmeter. The noise signal is integrated out with only minimal loss of speed.