The basic difference between Analog & Digital Instrument is given below.

S.No. Aspects Analog Instrument Digital Instrument
 1.  Information form  As the position of pointer on a dial/scale  As a number
2.   Possibility of human error  Exists Does not exist 
3.   Best possible accuracy  0.25%  +0.005% or greater
4.   Resolution  one in several hundreds  one part in several hundred thousand
5.   Presence of moving parts  moving part involved  No moving part
6.   Construction simple, direct reading type, can perform in unfavourable conditions   involves electronics, proper environmental conditions are required
7.   Rate of change of parameter  By seeing needle movement  No knowledge of change
8.   Time required to observe reading  If exact reading is required operator takes more time to guess the approximate tenths of small division  Very fast
9.   Auxiliary power requirement  No requirement of auxiliary power.  Require auxiliary source of power
10.  Mobility Can be portable Staionary
11.  Examples speedometer of an automobile, fuel gauge, voltmeter, ammeter, thermometer, etc. Digital ammeters, voltmeters, etc.
Difference between Analog & Digital Instrument

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