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Difficulty: EasySpecialized Testers

An electronics technician needs to verify the insulation integrity of high-voltage motor windings to ensure there is no current leakage to ground. Which specialized test instrument is designed specifically to measure these extremely high resistance values?

  1. A
    Signal generator
  2. MegohmmeterAnswer
  3. C
    Logic probe
  4. D
    Frequency counter

Answer

Megohmmeter
A megohmmeter (commonly referred to as a megger) applies a high DC test voltage across an insulator or motor winding to measure resistance in the megohm range, making it the proper instrument for evaluating insulation integrity.

Step-by-Step Solution

1
Identify the diagnostic requirement in the scenario.
The task requires measuring extremely high resistance values and checking insulation integrity against breakdown under high voltage.
Standard multimeters operate with low test voltages (3 to 9 V3\text{ to }9\text{ V}) and cannot expose insulation breakdown that occurs under high operational potentials.
2
Select the specialized test instrument designed for high-voltage resistance and insulation testing.
A megohmmeter (megger) applies a high DC test voltage (250 to 1000 V250\text{ to }1000\text{ V}) to measure resistance in the megohm or gigohm range.
The megohmmeter is specifically built for insulation testing and detecting minute leakage currents.

Key Concept

Specialized Testers - Megohmmeter (Megger) Insulation Testing
Estimated Time:45s
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