Which of the following instruments is used to test the earth resistance of an earthing system?
Megger
The correct answer is a Megger.
A Megger is a type of insulation resistance tester specifically designed to measure high resistances, including the earth resistance of an earthing system. It applies a high voltage to the system and measures the resulting current to calculate the resistance. Unlike multimeters or clamp meters, which measure lower resistances and currents, a Megger is built to handle the high impedance typically encountered in earth resistance measurements. An oscilloscope displays waveforms and is not suitable for resistance measurement. Therefore, the Megger is the only instrument listed appropriate for testing earth resistance.
In summary:
- Megger: Used for measuring high resistances, ideal for earth resistance testing.
- Clamp meter: Measures AC/DC current and voltage.
- Multimeter: Measures voltage, current, and resistance (but not typically high resistances like those found in earth grounds).
- Oscilloscope: Displays waveforms, not suitable for resistance measurement.
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