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Which instrument produces frequency domain information?

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Which instrument produces frequency domain information?

(a) Oscilloscope

(b) Spectrum analyzer

(c) Frequency divider

(d) Beam analyzer

I have been asked this question in examination.

This interesting question is from Fourier Theory in chapter Fundamentals of Electronics of Avionics

1 Answer

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Right option is (b) Spectrum analyzer

To explain: The test instrument for producing a frequency-domain display is the spectrum analyzer. Like the oscilloscope, the spectrum analyzer uses a cathode-ray tube for display, but the horizontal sweep axis is calibrated in hertz and the vertical axis is calibrated in volts or power units or decibels.

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