This is because most of the AC voltages to be measured are in sinusoidal form. The scale calibrated in average reading voltmeter is in terms of RMS value. The average reading voltmeter measures the average value of the AC voltage. These are average reading, peak reading and true RMS reading AC voltmeter. There can be three types of AC voltmeters based on the type of measurement it provides. If the designing needs to be economical, then we should use multistage DC amplifier. The usage of the amplifier increases the cost of the circuit. The amplifier is a vital component because it amplifies the signal which got attenuated during the measurement procedure. On the contrary, if the multistage amplifier used is DC, then the rectifier should be used before it. If we are using multistage AC amplifier, then the rectifier circuit will be used after the amplifier. This depends on the type of amplifier used in AC voltmeter. The rectifier can be used before the multistage amplifier or after the amplifier. Then the final output of DC amplifier is given to the PMMC meter. The output of attenuator is given to rectifier which converts the AC voltage into pulsating DC voltage. The input to be measured is given to the attenuator circuit which performs the operation of selection of a particular range of voltage.
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