Wednesday, December 18, 2013

Classification of Measuring Instruments

       Electrical measuring instruments are mainly classified as:
a) Indicating Instruments      b) Recording Instruments    c) Integrating Instruments

a) Indicating Instruments: These instruments make use of a dial and pointer for showing or indicating magnitude of unknown quantity. The examples are ammeters, voltmeter etc.
b) Recording Instruments: These instruments give a continuous record of the given electrical quantity which is being measured over a specific period.
       The examples are various types of recorders. In such recording instruments, the reading are recorded by drawing the graph. The pointer of such instruments is provided with a marker i.e. pen or pencil, which moves on graph paper as per the reading. The X-Y plotters is the best example of such an instrument.
c) Integrating Instruments: These instruments measure the total quantity of electricity delivered over period of time. For example a household energymeter registers number of revolutions made by the disc to give the total energy delivered, with the help of counting mechanism consisting of dials and pointers.

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