Which of the following measurements cannot be made with the help of a frequency counter?
- A. Fundamental frequency of input signal
- B. Frequency components of the input signal at least up to third harmonic
- C. Time interval between two pulses
- D. Pulse width
Answer: B. Frequency components of the input signal at least up to third harmonic
Explanation: Frequency counters measure frequency, time intervals, and pulse widths, but cannot measure individual harmonic spectral components.