Question 167Electricity & Electronics - 1st Asst/Chief

70% to pass

Prior to using an analog multimeter set up as an ohmmeter, the leads are purposely shorted together. Which of the following actions should be taken if, when adjusting to 'zero' ohms, the indicating needle cannot be returned to 'zero' on the scale?

AThe test reading should be added to each final reading.
BThe lead clips should be replaced.
CThe test reading should be subtracted from each final reading.
DThe batteries should be replaced.
AI Explanation

The correct answer is D) The batteries should be replaced. When using an analog multimeter set up as an ohmmeter, the leads are purposely shorted together to adjust the meter to read '0' ohms on the scale. If the indicating needle cannot be returned to '0' when the leads are shorted, it indicates that the battery in the multimeter is low and needs to be replaced. This is because the internal resistance of a weak battery can prevent the ohmmeter from accurately reading '0' ohms when the leads are shorted. The other answer choices are incorrect because they do not address the root cause of the issue, which is a low battery. Adjusting the readings or replacing the lead clips will not resolve the problem if the battery is the source of the issue.

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