9-4A6 A
Which of the following is the best test procedure to isolate the source of distortion in the audio output of a receiver?
A. Use an oscilloscope to visually display AC signals on the output of each AF amplifier stage.
B. Use a spectrum analyzer to visually display the amplitude and frequency of each AF amplifier stage input.
C. Use a signal generator to inject a 1 KHz signal into the first AF amplifier stage and evaluate audio output.
D. Use a digital voltmeter to measure transistor bias voltages in each AF amplifier stage.
