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Chapter: Measurements and Instrumentation - Electrical and Electronics Instruments

Principle and Types of Analog and Digital Voltmeters

Basically an electrical indicating instrument is divided into two types. They are i) Analog instruments ii) Digital Instruments.

Principle And Types Of Analog And Digital Voltmeters

 

Ø Basically an electrical indicating instrument is divided into two types. They are

i) Analog instruments

ii)      Digital Instruments.

 

Ø       Analog instruments are nothing but its output is the deflection of pointer, which is proportional to its input.

 

Ø       Digital Instruments are its output is in decimal form.

 

Ø       Analog ammeters and voltmeters are classed together as there are no fundamental differences in their operating principles.

 

Ø       The action of all ammeters and voltmeters, with the exception of electrostatic type of instruments, depends upon a deflecting torque produced by an electric current.

 

Ø       In an ammeter this torque is produced by a current to be measured or by a definite fraction of it.

 

Ø       In a voltmeter this torque is produced by a current which is proportional to the voltage to be measured.

 

Ø       Thus all analog voltmeters and ammeters are essentially current measuring devices.

 

The essential requirements of a measuring instrument are

 

(i)      That its introduction into the circuit, where measurements are to be made, does not alter the circuit conditions ;

 

(ii)   The power consumed by them for their operation is small.

 

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