In which of the situations listed will a...

Question 1 / 270705eccefa4bacbc34ba4d4840c

Question 1 of 270705eccefa4bacbc34ba4d4840c

In which of the situations listed will a megohmmeter give the most accurate readings?

Question 1 of 27070

In which of the situations listed will a megohmmeter give the most accurate readings?

🔍 Key Concepts

• Insulation resistance testing principles for electric motors and generators • Effect of temperature and moisture on insulation resistance readings • Why equipment is often de-energized and grounded before using a megohmmeter

💭 Think About

• When is the insulation in the most stable, undisturbed condition: during operation, during discharge, just before restart, or after some period of being shut down? • How does residual charge or static electricity in the windings affect a megohmmeter reading? • Why might grounding time before testing matter for accuracy and safety?

✅ Before You Answer

• Confirm that the equipment should be de-energized for a proper megohmmeter test • Consider whether any stored or static charges might still be present in the windings during each option • Think about how much time is needed for the machine to cool, normalize, and safely discharge before measuring insulation resistance

Question 1 of 27070

In which of the situations listed will a megohmmeter give the most accurate readings?

While the machine is in operation.

While the machine is discharging static electricity.

Immediately prior to restarting the machine.

When the machine has been shut down and grounded for a period of 15 minutes.

Question 1 / 270705eccefa4bacbc34ba4d4840c

Question 1 of 270705eccefa4bacbc34ba4d4840c

In which of the situations listed will a megohmmeter give the most accurate readings?

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Question 1 of 27070

In which of the situations listed will a megohmmeter give the most accurate readings?