TYPES OF INSTRUMENTS USED AS AMMETER AND VOLTMETER WITH DIFFERENT NATURE OF SUPPLY

PMMC (Permanent magnet moving coil)

• Only used for DC

Moving iron { measures only rms value }

• used for AC & DC

Electro - dynamo meter

• used to measure both AC & DC . These instrument same calibration - transfer instrument.

Hot wire (measure rms value)

• used for both AC & DC

Thermocouple (measure rms value)

• used for both AC & DC

Induction type instrument

• used for AC only

Electrostatic instrument (measure Voltage only)

• both AC & DC

Rectifier type instrument

• measure Average value

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