Advanced Qualification · A-003 Measurements · A-003-004-009

What is the traditional way of verifying the accuracy of a crystal calibrator?

1. A Compare the oscillator with your transmitter
2. B Use a dip-meter to determine the oscillator's fundamental frequency
3. C Compare the oscillator with your receiver
4. D Zero-beat the crystal oscillator against standard frequency station such as WWV

Correct answer: D — Zero-beat the crystal oscillator against standard frequency station such as WWV. From the official ISED question bank, verified word for word.

Why

Zero-beating means adjusting your crystal oscillator until its signal matches a known standard like WWV so perfectly that no sound or "beat" is heard, proving your frequency is exact. The full explanation — and one for every question — is in Pro.

Practise this section

Measurements: meters, oscilloscopes, counters, signal generators, and what a reading actually tells you.

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