Discussion
A rectifier instrument's scale is calibrated using a form factor of
Answer: A
Correct answer: 1.11 for a sinusoidal waveform
The rectifier instrument responds to the average of the rectified waveform, but the scale is wanted in rms, so it is marked using the form factor of a sinusoid: \[ \frac{\mathrm{rms}}{\mathrm{mean}} = \frac{0.707}{0.637} = 1.11. \] The calibration is therefore correct only for the waveform it assumes.
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