Discussion
Which receiver measurement requires a calibrated signal generator?
Answer: B
Sensitivity is quoted as the input level needed for a stated output signal-to-noise ratio, so a generator of known output is essential. Audio power needs a load and a voltmeter. Loudspeaker impedance needs a bridge. And idle current needs only an ammeter. Measurements that reference an input level always require a calibrated source, which is why the signal generator is the central instrument on a receiver bench.
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