Exam Question
(a) Sketch, the circuit diagram of an instrument used for measuring electrical insulation resistance. (8)
(b) Describe the circuit diagram sketched in (a), explaining how it operates when measuring electrical insulation resistance. (8)
Class 4 (4th Engineer)
MET
📅 Apr 2025
Reference Answer
### (a) Circuit Diagram of an Insulation Resistance Tester (Megger)
A diagram is required to illustrate the internal circuitry of a hand-cranked insulation resistance tester, commonly known as a Megger. The key components to be shown are:
1. **DC Generator:** A hand-cranked high-voltage DC generator (typically 500V or 1000V).
2. **Permanent Magnet:** Provides the magnetic field for the meter movement.
A diagram is required to illustrate the internal circuitry of a hand-cranked insulation resistance tester, commonly known as a Megger. The key components to be shown are:
1. **DC Generator:** A hand-cranked high-voltage DC generator (typically 500V or 1000V).
2. **Permanent Magnet:** Provides the magnetic field for the meter movement.
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