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Q#1 Potentiometer and Q-Meter GATE EE 1997 MSQ +2 marks -0 marks

A 0–1000 micro ampere microammeter guaranteed to be 0.1% accurate needs to be calibrated using a 1.0 V d.c. potentiometer. Draw the circuit diagram and find the value of the standard resistance used and the least count of the potentiometer.

The absolute minimum required value of the standard series resistance () to leverage the full-scale range of the potentiometer is exactly .

To successfully resolve the instrument's guaranteed accuracy step, the least count of the potentiometer must be at least .

If a standard resistance of  is used instead, the voltage drop across it at full-scale current will exceed the maximum voltage range of the potentiometer.

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