Discussion
The error of an instrument is normally given as percentage of :
Answer: B
Instrument error is normally given as a percentage of Full scale value.
Manufacturers specify accuracy as a percentage of full-scale deflection, because the absolute error of a meter is roughly constant over its range. A consequence is that readings near the bottom of the scale have a much larger relative error, which is why one chooses a range where the reading falls in the upper part of the scale.
Quoting error relative to the measured value would make it vary with each reading; mean and RMS values are properties of signals, not the basis of an accuracy specification.
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