Heavy Duty Equipment Technician Red Seal Exam Prep · Question
When using a digital multimeter to measure resistance, the circuit being tested must be:
Resistance measurements must always be performed on a de-energized circuit. Measuring resistance on an energized circuit can damage the multimeter or provide in
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Question: When using a digital multimeter to measure resistance, the circuit being tested must be:
Answer options: ✅ De-energized (power off)
- Fully energized (power on)
- Under maximum load
- Connected to a ground source
Correct answer: De-energized (power off)
Explanation: Resistance measurements must always be performed on a de-energized circuit. Measuring resistance on an energized circuit can damage the multimeter or provide inaccurate readings.
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