multimeter final

MULTIMETERMULTIMETERMansoor Asif Mansoor Asif

EE 701EE 701

1National University of Sciences & Technology

Scheme of Scheme of presentationpresentation

• Introduction• Parts of Multimeter• Function of each part• Operation • Uses of Multimeter


IntroductionIntroduction

• Donald Macadie in 1920• Avometer• Analog Multimeter ,Digital

Multimeter or Bench top Multimeter

• AMM ,DMM,BTM• US$10-US$5000• ACWEEC


IntroductionIntroduction


http://en.wikipedia.org/wiki/File:Benchtop_multimeter.jpg

Parts of MultimeterParts of Multimeter

• Meter scale (AMM)• Liquid crystal display(DMM/BTM)• Pointer adjust(AMM)• Selector function range• Test probes• Battery




Test probes

LCD

Selector function range

Pointer adjust



Analog Multimeter

Meter scale


Common terminalVΩ terminal

Amps terminal

Title


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



Test probes

LCD


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

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

OperationOperation


UsesUses

It is used to measure• Voltage in volts.• Current in amperes• Resistance in ohms• Capacitance in farads• Conductance in Siemens• Continuity of circuit



QUESTIONS?

multimeter final

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