Advanced Qualification · A-003 Measurements · A-003-004-009
What is the traditional way of verifying the accuracy of a crystal calibrator?
- ACompare the oscillator with your transmitter
- BUse a dip-meter to determine the oscillator's fundamental frequency
- CCompare the oscillator with your receiver
- DZero-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 is section A-003 of the Advanced exam: Measurements: meters, oscilloscopes, counters, signal generators, and what a reading actually tells you.
Drill A-003 — free, no account