Prior to taking a resistance reading with an...

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Question 1 of 205eccefa3bacbc34ba4d47f5f

Prior to taking a resistance reading with an analog volt-ohm-milliammeter, the 'zero' setting must be adjusted. After clipping the two leads together, you find the adjustment knob will not return the pointer to 'zero'. What is this most likely an indication of?

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🔍 Key Concepts

• Analog ohm meter operation – how the internal battery is used to drive current through the leads when measuring resistance • Zeroing procedure on the ohms scale – what you are actually adjusting when you short the test leads and set to zero • Typical symptoms of weak meter batteries vs. mechanical faults

💭 Think About

• When the leads are clipped together (shorted), what resistance should the meter see, and what should the pointer do if everything is healthy? • Which component inside an analog ohm meter provides the power for the resistance measurement, and what happens to its performance as that component ages? • If the zero-adjust knob itself were faulty, how would that differ from a situation where there simply isn’t enough internal power to drive the pointer all the way to zero?

✅ Before You Answer

• Verify which choices relate to internal power source issues versus mechanical adjustment issues. • Think about which problem is most common and specifically causes the pointer to not reach zero with leads shorted, even though the meter movement is otherwise normal on voltage or current ranges. • Consider what you would check or replace first in the field before condemning the meter movement or the adjustment knob.

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