Dc crompton potentiometer pdf3/10/2024 ![]() ![]() The standard resistance is connected in series with the ammeter which is to be calibrated. The figure below shows the circuit for the calibration of the ammeter. The negative and positive error occurs in the readings of the voltmeter if the readings of the potentiometer and the voltmeter are not equal. ![]() The potentiometer measures the maximum possible value of voltages. The accurate value of the voltmeter is determined by measuring the value of the voltage to the maximum possible range of the potentiometer. The voltage ratio box is used to step-down the voltage to a suitable value. The circuit requires two rheostats, one for controlling the voltage and another for adjustment. The circuit for the calibration of the voltmeter is shown in the figure below.
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