Extra exam question E4A01
Subelement E4, AMATEUR PRACTICES· Group E4A
Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope?
- A.Sampling rate of the analog-to-digital converter (correct answer)
- B.Analog-to-digital converter reference frequency
- C.Q of the circuit
- D.All these choices are correct
WhyThe highest frequency signal a digital oscilloscope can accurately display is limited by the sampling rate of its analog-to-digital converter. A digital oscilloscope can only accurately reconstruct signal content up to a fraction of its analog-to-digital converter's sampling rate, since the Nyquist limit ties the highest correctly displayed frequency directly to how fast the converter samples the incoming waveform, answer A. The ADC's reference voltage sets amplitude range rather than frequency limits, and circuit Q describes a resonant circuit's selectivity, not an oscilloscope's own frequency ceiling.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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