During ECG machine calibration, what is the standard voltage signal used to check the sensitivity?
1 millivolt
Calibration of an ECG machine's sensitivity is routinely checked by applying a 1 millivolt standardisation signal; on a correctly calibrated machine this produces a 10 mm vertical deflection on the recording paper.
10, 5 or 2 mV would saturate or distort the amplifier — the universal calibration standard is 1 mV.
Hence, 1 millivolt.
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