Advanced Qualification · A-003 Measurements · A-003-003-009
Which two instruments are needed to measure FM receiver sensitivity for a 12 dB SINAD ratio (signal + noise + distortion over noise + distortion)?
- ARF signal generator with FM tone modulation and a deviation meter
- BOscilloscope and spectrum analyzer
- CReceiver noise bridge and total harmonic distortion analyser
- DCalibrated RF signal generator with FM tone modulation and total harmonic distortion (THD) analyzer
Correct answer: D — Calibrated RF signal generator with FM tone modulation and total harmonic distortion (THD) analyzer. From the official ISED question bank, verified word for word.
Why
To measure FM receiver sensitivity at a 12 dB SINAD ratio, you need a calibrated RF signal generator with FM tone modulation to inject a precise test signal and a total harmonic distortion (THD) analyzer to measure the combined noise and distortion relative to the signal. The full explanation — and one for every question — is in Pro.
Practise this section
Measurements is section A-003 of the Advanced exam: Measurements: meters, oscilloscopes, counters, signal generators, and what a reading actually tells you.
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