Question
Which of the following factors most affects the accuracy of a frequency counter?
Answer Options
- A) Input attenuator accuracy
- B) Time base accuracy
- C) Decade divider accuracy
- D) Temperature coefficient of the logic
Correct Answer: B
Explanation
A frequency counter measures the frequency of an incoming signal by counting the number of cycles that occur within a fixed, very precise period of time. This fixed period is generated by the counter’s internal reference oscillator, known as the time base.
The most critical factor affecting the accuracy of the frequency measurement is the stability and precision of this time base accuracy. If the time base is off by a small fraction (e.g., a few parts per million), the resulting frequency measurement will be off by that same fraction, regardless of how accurate the digital counting circuits themselves are. Modern counters use high-quality crystal oscillators, often temperature-compensated (TCXO) or oven-controlled (OCXO), to ensure a highly accurate time base.
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