Types of mechanical instruments
1)Active and passive instrument.
The instrument which
require external power for manupulation and measurement is generally known as a
active instrument.
eg.potentiometer.
The instrument which does
not require external power for manupulation and measurement is generally known
as a Passive instrument.
eg. Liquid level
measurement using fload and gear arrangement
2)Analog and digital instrument:
The analog instrument in
which the output can have an infinite
number of values within the range that the instrument is designed to
measure.eg.voltmeter
The Digital instrument in
which the output can have an finite
number of values within the range that the instrument is designed to
measure.eg.electronic speedmeter
3)Null type and deflection type instruments:
In the deflection type
instrument quantity being measure
displayed in terms of the amount of Pointers deflection Eg.pressure gauge.
In null type instrument
measurement is done on the basis of the pointer at the null position with a
fixed standard quantityeg.balance panal
4)Manual operated and automatic operated:
Manual operated
unatrument require the service of operator
eg:null type thermometer
potentiometer
automatic instrument does
not require the operated they are self operated
eg:mercury thermometer
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