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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