Discussion
A spectrum analyser is an instrument used for :
Answer: B
A spectrum analyser is used for identifying dominant frequencies and harmonics.
A spectrum analyser displays signal amplitude against frequency, so it shows the frequency components of a signal: the fundamental, its harmonics, spurious signals and the noise floor.
Visualising the time variation of a waveform is the job of an oscilloscope. A spectrum analyser displays the noise floor but does not introduce it. Impedance is measured with an impedance analyser or LCR meter.
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