Discussion
Which measurement would distinguish clipping from a genuine sine output?
Answer: C
A spectrum analyser shows the harmonics directly, and their level relative to the fundamental quantifies the distortion. A counter reads frequency regardless of waveform, a voltmeter gives amplitude, and an oscilloscope will show gross clipping but not the fraction of a per cent that matters in a good generator. Choosing the instrument that responds to the quantity in question, rather than the one nearest to hand, is what makes a measurement decisive.
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