Measurement
Potentiometer and Q-Meter
Potentiometer
Questions mapped to Potentiometer under Potentiometer and Q-Meter.
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IncorrectA dc potentiometer is designed to measure up to about 2V with a slide wire of 300 mm. A standard cell of EMF 1.18 V obtains balance at 600 mm. A test cell is seen to obtain balance at 680 mm. The EMF of the test cell is
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Sign in to UnlockFigure shows the input attenuator of a multimeter. The meter reads full scale with 12V at M, with the range switch at position ‘q’. What is the required voltage at M to obtain full-scale deflection with the range switch at position‘s’?
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Sign in to UnlockA 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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Sign in to UnlockIn d.c. potentiometer measurements, a second reading is often taken after reversing the polarities of the d.c. supply and the unknown voltage, and the average of the two reading is taken. This is with a view to eliminate the effects of
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