Digital Muti Meter.pdf

 What id DMM?
 Block Diagram.
 Specification of DMM.
 Measurement of Resistance, Voltage & current By using DMM.
 Types of DMM.
 Advantages, Dis-Advantages & Application.
 Q-A Section.
 References

1. DEPARTMENTOFELECTRICAL ENGINEERING
Subject Name:-Electrical Measurement & Instrumentations
Group no. :-09
Self learning activity
Topic :Digital Multi-Meter

2. index
What id DMM?
Block Diagram.
Specification of DMM.
Measurement of Resistance, Voltage &
current By using DMM.
Types of DMM.
Advantages, Dis-Advantages &
Application.
Q-A Section.
References

6. Block Diagram

12. Types of Digital Multimeters
Clamp Multimeter
Itisatypeofdigitalmultimeterinwhich
onecanonlymeasuretheflow
ofelectricity.Ithasatypeofclamp
featureinitasthenamesuggestsit.This
clampiscapableofmeasuringthe
currentflowwhenthetwoprobsget
connectedtothevoltage. Whereas,the
electricpowercanbecalculatedbyusing
itbymultiplyingthecurrentflowwith
thevoltage.

13. Fluke Multimeter
Itisatypeofdigitalmultimeterwhichisused
forseveralpurposeswhichconsistsofabig
displayandisgenerallyusedtocalculatethe
voltageaswellastheresistance.Sometimes
anadvancedversionofitisalsousedto
calculatethedutycycle,temperature,
humidity,frequency,pressure,andmanymore
electricalparameters.Thisisnotused
commonlyasithasmanyfeaturesinitand
onlyprofessionalscanuseitwithease.Italso
helpsinadjustingdifferenttypesofelectrical
parameters.Itisprotectedbyatransient
voltage.

14. AutoRangingMultimeter
Itisatypeofdigitalmultimeterwhichis
quitesimpleandexpensivecomparedto
anyothertypeofdigitalmultimeter.Itis
mainlyusedtocalculateallthe
parametersandpropertiesofanelectronic
device. Itconsistsofaknobinitsmiddle
whichisusedtocalculatetheparameters.
Itisgenerallyusedbythosewhoarenot
professionalorelectricians.Itiscapable
ofcalculatingoneelectricalpropertyor
parameteratatime.

16. Disadvantages
Digital values sometimes fluctuate rapidly
until the reading stabilizes, making them more
difficult to read.
It may take longer for values to “settle” in
some applications, slowing work.
Digital multimeters are more susceptible to
external noise.

17. Applications
ItisusedtomeasureACandDCvoltageandcurrent.
Itisalsousedtomeasureresistance.
Itisalsousedtocheckthediodes.
Itisalsousedtomeasurethefrequencyaswellasthe
capacitanceofanelectronicdevice.
Itisalsousedtotestbatteries,
switches,lightbulbs,andoutlets.
Itisalsousedtodetermineanyfaultspresentintheelectric
circuit.
Itisusedtomeasurethetimeandfrequencyoftheelectronic
device.
Itisalsousedtocheckthetemperatureoftheelectronicdevice.

19. Questions&Answers
Que1)Whichtypeoferrorispresentinamultimeter?
Ans.Thetypeoferrorwhichispresentinamultimeterisanormalmodeerror.
Que2)HowmanytypesofDigitalMultimetersarethere?
Ans.TherearemainlyThreetypesofDigitalMultimeterswhichareClamp
multimeters,Flukemultimeters&AutoRangingMultimeter.
Que3)WhatisthemostcommontypeofDigitalmultimeterused?
Ans.Themostcommontypeofmultimeterusedistheflukemultimeter.
Que4)Whichisabetterdigitaloranalogmultimeter?
Ans.Thedigitalmultimeterisbetterthantheanalogmultimeterastheyaremore
accurate.

20. References:
StephenA.Dyer,WileySurveyofInstrumentationandMeasurement,John
Wiley&Sons,2004ISBN0471221651,pp.277–281.
"DigitalMultimeterMeasurementFundamentals".NationalInstruments.
Retrieved26January2008.
KeysightTechnologies.
"Keysight3458A DigitalMultimeterData
Sheet"(PDF).KeysightTechnologies.Archived(PDF)fromtheoriginalon
9October2022. Retrieved31July2014.
FlukeManufacturing.
"LoggingandanalyzingeventswithFlukeView
FormsSoftware"(PDF). Archived(PDF)fromtheoriginalon9October
2022. Retrieved28January2007.