Multimeter Final
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MULTIMETERMULTIMETERMansoor Asif Mansoor Asif
EE 701EE 701
1National University of Sciences & Technology
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Scheme of Scheme of presentationpresentation
• Introduction• Parts of Multimeter• Function of each part• Operation • Uses of Multimeter
2National University of Sciences & Technology
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IntroductionIntroduction
• Donald Macadie in 1920• Avometer• Analog Multimeter ,Digital
Multimeter or Bench top Multimeter
• AMM ,DMM,BTM• US$10-US$5000• ACWEEC
3National University of Sciences & Technology
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IntroductionIntroduction
4National University of Sciences & Technology
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Parts of MultimeterParts of Multimeter
• Meter scale (AMM)• Liquid crystal display(DMM/BTM)• Pointer adjust(AMM)• Selector function range• Test probes• Battery
5National University of Sciences & Technology
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6National University of Sciences & Technology
Parts of MultimeterParts of Multimeter
Test probes
LCD
Selector function range
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Pointer adjust
7National University of Sciences & Technology
Parts of MultimeterParts of Multimeter
Analog Multimeter
Meter scale
Selector function range
Common terminalVΩ terminal
Amps terminal
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Title
8National University of Sciences & Technology
Function of partsFunction of parts
• Meter scale takes the pointer reading
• LCD shows the reading in digits• Pointer adjust fixes the pointer
position and remove error• Selector function range selects
the quantity we want to measure• Test probes help us connecting to
device we want to test
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9National University of Sciences & Technology
Parts of MultimeterParts of Multimeter
Test probes
LCD
Selector function range
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OperationOperation
Principle of Multimeter• Electromagnetism • Force on a current carrying
conductor
Working • Select the desired quantity by
selector range• Connect the two needles of probe
with circuit National University of Sciences &
Technology 10
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OperationOperation
• τ=NIBAcosα • Deflecting couple =NIBA• Restoring torque=cθ• Deflecting torque=restoring
couple• I=cθ/BAN• “I” depends on “θ” directly
National University of Sciences & Technology 11
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OperationOperation
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UsesUses
It is used to measure• Voltage in volts.• Current in amperes• Resistance in ohms• Capacitance in farads• Conductance in Siemens• Continuity of circuit
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QUESTIONS?