Different Types of Measuring Instruments According to Principle of Working
The principle of working of all measuring instruments depends upon the various effects of electric current or voltage. The instruments generally classified according to effects utilized in their operation is given below in table
S.No | Effect | Type of Instrument | Suitable for Supply | Instrument utilising the effect |
1 | Magnetic effect | Moving-iron type | d.c. and a.c. | Ammeter, Voltmeter |
2 | Electrodynamic effect | Permanent moving coil type and dynamo-meter | d.c. only , d.c. and a.c. | Ammeter, voltmeter and Ammeter, voltmeter, wattmeter |
3 | Electro-magnetic induction effect | Induction type | a.c. only | Ammeter, voltmeter, wattmeter, energy meter |
4 | Thermal effect | Hot-wire type | d.c. and a.c. | Ammeter, voltmeter |
5 | Chemical effect | Electrolytic meter type | d.c. only | Ampere-hour meter |
6 | Electrostatic effect | Electrostatic type | d.c. and a.c. | Voltmeters only |
The above table represents the different types of instruments according to principle of working.
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