For measuring current at high frequency we should use_______________?
Correct answer: C. thermocouple instrument
- A. moving iron instrument
- B. electrostatic instrument
- C. thermocouple instrument
- D. none of the above
Explanation
A thermocouple instrument is suitable for high-frequency current because its thermal action responds to the heating effect and can indicate the effective value over a wide frequency range. Moving-iron instruments are more affected by frequency and waveform limitations.
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