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CHAPTER 2DC AMMETER
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Dc Ammeter
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DC AMMETER
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The PMMC galvanometer constitutes the basicmovement of a
dc ammeter.
The coil winding of a basic movement is smalland light, so
it can carry only very small
currents. The PMMC can use to build an ammeter with
connected the shunt resistor and meter inparallel.
A low value resistor (shunt resistor) is used inC ammeter to
measure large current. !asicC ammeter
DC AMMETER
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BASIC DC AMMETER CIRCUIT(SINGLE RANGE DC AMMETER).
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DC Ammeter circuit.
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EQUATION
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A "mA meter movement withan internal resistance of
"##$ is to be converted intoa #%"## mA. Calculate thevalue of
shunt resistance
re&uired.
EXERCISE
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A 'ma Meter ith An nternal*esistance +f "## s To !e
Converted To # - "#maAmmeter. Calculate The /alue
+f The 0hunt *esistance*e&uired.
EXERCISE
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T+ *A123 C AMM3T3*
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MULTIRANGE AMMETER INDI!IDUAL SHUNT
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MULTIRANGE AMMETER
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m"t#em"tic"$ "%"$&'i' *"'ic+c "mmeter
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esign a two range dc miliammeter with a basic meter
having a resistance 4$ andfull scale de5ection for thecurrent of
'mA. The re&uired
ranges are # - "#mA and # -#mA.
EXERCISE
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esign a multirange ammeter toprovide an ammeter with acurrent
range of #%"mA, #%"#mA,#%#mA and #%"##mA. Ad6Arsonval movement with
aninternal resistance of "##$ andfull scale current of #7A is
used.
EXERCISE
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A8*T+1 09:1T
