Question

explain the experiments set up to calibration voltmeter Or ammeter.
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Answer 1

Answer:

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$\bigstar\underline{\underline{calibration \: of \: voltmeter :- }}$

In the circuit, the most important component for the calibration process is a suitable stable DC voltage supply. This is because any fluctuations in supply voltage will cause an error in the voltmeter calibration thereby leading to an entire failure of the experiment. So standard voltage cell with stable terminal value is taken as a source and connected in parallel with voltmeter which needs to be calibrated. The two trim pots ‘RV1’ and ’RV2’are used for adjusting the voltage that is to appear across the voltmeter as shown in the figure.

A voltage ratio box is also connected in parallel with the voltmeter to divide the voltage across the voltmeter and get appropriate value suitable for connecting the potentiometer.

With the entire setup in place, we are ready for testing the accuracy of the voltmeter. So to start, just provide the power to the circuit to get a reading on the voltmeter and an unknown voltage at the voltage ratio box output. Now we will use a calibrated potentiometer to measure this unknown voltage.

After getting the potentiometer reading, check whether the potentiometer reading matches the voltmeter reading. Since potentiometer measures the true value of voltage, if the potentiometer reading does not match with the voltmeter reading, then a negative or positive error is indicated. And for correction, a calibration curve can be drawn with the help of the readings of voltmeter and potentiometer.

Also, for accuracy of measurements, it is necessary to measure voltages near the maximum range of the potentiometer as far as possible.

Explanation:

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- Tanvi.

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