Differential Oscilloscope Measurements

A Primer on Differential Measurements, Types of Amplifiers, Applications, and Avoiding Common Errors

Simulated 4 mVp-p heartbeat waveform can not be measured in the presence of 500 mVp-p, 60 Hz common-mode noise, using a conventional oscilloscope probe (upper). A differential amplifier extracts the signal from the noise (lower).

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