What is the purpose of a frequency meter?

• A. Measures insulation resistance
• B. Displays electrical waveforms
• C. Measures the frequency of an AC signal
• D. Checks resistance in a circuit

Answer: (C)

A frequency meter is specifically designed to measure the frequency of an alternating current (AC) signal. Frequency, which is expressed in hertz (Hz), indicates how many cycles occur in one second. This measurement is crucial in various applications, including verifying the operational frequency of generators and ensuring that equipment operates at the desired frequency for optimal performance.

Unlike other instruments that measure different electrical properties, the frequency meter focuses solely on the frequency aspect of AC signals. For instance, it does not assess insulation resistance or circuit resistance, nor does it display the shape or characteristics of electrical waveforms. Its unique function makes it an essential tool in diagnosing and troubleshooting electrical systems where frequency is a critical parameter.