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Important Information about Analog and Digital Instruments.
Electronics Voltmeters,Ammeters and Ohmmeters are use Amplifiers,Rectifiers and other ancillary 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. measurement 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 positioning 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 computers etc. for storage and future computations. 04)The power requirement of Digital Instruments are considerably less. For more details,please visit
http://elctronicsengineering.blogspot.com/ |
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