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Electronics Voltmeters,Ammeters and Ohmmeters are use Amplifires,Rectifires and other ansiliary circuit to produce a current proportional to the quantity
being measured.This current is measured by PMMC (Permanent magnetic moving Coil) instrument.
This is Analog type instrument.Now an Electronic Instruments are use Digital read out systems and in that case they are called "Digital Electronic
Instruments".Till then,the Analog type of instruments are in use because of the economic considerations.
Also Analog and Digital instruments must perform the same functions i.e. measurment of Voltage,Current,Power and Circuit Parameters.The principle
operation is different in each case.
Advantages of Digital Instruments:-
01)The Digital Instruments indicate the reading directly in Decimal numbers and therefore errors on account of human factors like due to parallax and
approximation are eliminated.
02)The reading may be carried to any number of significant figures by merely postioning the decimal point.
03)Since the output of Digital instruments are in Digital form,the output may be directly fed into memory devices like Tape Recorders,Printers and
Digital computors etc. for storage and future compatations.
04)The power requirment of Digital Instruments are considerably less.
For more details, visit http://elctronicsengineering.blogspot.com/
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| Author: Shinu 31 May 2008 | Member Level: Gold Points : 2 |
Thanks for the information
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