24. Which of the following is the best test procedure to isolate the source of distortion in the audio output of a receiver?

Use an oscilloscope to visually display AC signals on the output of each AF amplifier stage.
Use a spectrum analyzer to visually display the amplitude and frequency of each AF amplifier stage input.
Use a signal generator to inject a 1 KHz signal into the first AF amplifier stage and evaluate audio output.
Use a digital voltmeter to measure transistor bias voltages in each AF amplifier stage.

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