Analog And Digital Meter Instruments And Differences

What is Analog and Digital Instruments 

Today instru­ments are made using two types of tech­niques to mea­sure elec­tri­cal quan­ti­ties such as volt­age and cur­rent two types of instru­ments they were Ana­log And Dig­i­tal Meter Instruments

1.Analog Instruments

Analog and Digital Instruments
Ana­log meter

Ana­log Instru­ment refers to the quan­ti­ty of elec­tri­cal quan­ti­ties to be mea­sured by mov­ing the asso­ci­at­ed point­er over a scale by the mech­a­nism of a mechan­i­cal meter. That is, the quan­ti­ty mea­sured accord­ing to the deflect­ed posi­tion of the point­er (anal­o­gous to deflec­tion) is calculated 

This tool is packed with phys­i­cal com­po­nents such as mag­net, spin­dle, point­er, spring so that its shape is large 

These types of instru­ments are not very accu­rate and con­sume more pow­er com­pared to ana­log meters. Again, if there are small changes in this type of instru­ment, there is a par­al­lax error. There­fore dig­i­tal instru­ments are used where high accu­ra­cy is required 


  • Lack of accuracy 
  • Res­o­lu­tion is low 
  • par­allex error

2.Digital Instruments

Analog And Digital Meter Instruments
Dig­i­tal meter

A dig­i­tal instru­ment is an elec­tron­ic cir­cuit that uses elec­tri­cal com­po­nents such as ICs to sen­sor quan­ti­ties, mea­sure and mea­sure them, and dis­play them as dis­crete num­bers, ie dig­its, on asso­ci­at­ed dis­play devices 

This type of meter does not have any mechan­i­cal sys­tem. All instru­ments are made up of sol­id state devices. It is small in size as it does not have any phys­i­cal tools like point­er or magnet 

Advantages Of Digital Instruments 

  • Mea­sures are avail­able direct­ly because human error is low 
  • Its dimen­sions are mea­sured in dec­i­mal num­bers This fea­ture is not avail­able on ana­log meters 
  • The high­er the input imped­ance in dig­i­tal meters, the low­er the load­ing effect 
  • Its out­put is in dig­i­tal num­bers so it can be fed direct­ly to mem­o­ry devices such as tapes and printers 
  • Dig­i­tal instru­ments, like ana­log meters, con­sume less power 
  • Mea­sur­able dimen­sions of dig­i­tal meters are mea­sured in less time but ana­log meters take longer 
  • Read­ings are tak­en very quick­ly on the dig­i­tal meter

Comparison between analog and digital instruments 

SI.NoDig­i­tal instrumentAna­log instrument
1Dis­played by mea­sured quan­ti­ty numbersIs defined on a scale by the deflec­tion of a mea­sured pointer
2High accu­ra­cyLow accu­ra­cy
3Does not cause a load­ing effect for the | cir­cuit to be measuredCaus­ing a load­ing effect on the cir­cuit to be measured
4No obser­va­tion errorsObser­va­tion error is high
5Range is highLow range
6High cost­lyLow cost
7Read­ings are storedNot stored a readings
8High res­o­lu­tionLow res­o­lu­tion
9High Speed of readingLow speed of reading
10No read­ing errorRead­ing error is high
11Used in any positionOnly one posi­tion to be used
Com­par­i­son between ana­log and dig­i­tal instruments 

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