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Moving Iron Vane Movement
VOLTMETERS

Electrical Science Volume 4 of 4
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METER MOVEMENTS Test Instruments & Measuring Devices Summary Meter movements are summarized below. Meter Movement Summary D’Arsonval - A DC moving coil movement where the moving coil is suspended between the poles of a permanent magnet restrained by helical springs, and the measured  current  flowing  through  the  moving  coil  produces  a  torque  on  the attached pointer proportional to the current. Electrodynamometer  -  The  moving  coil  and  attached  pointer  are  suspended between  and connected  in  series  with  the two  stationary  field  coils so  that  the same current flows through each.  A measured current flowing through the three coils in either direction causes a magnetic repulsion between the field coils and the moving coil.   The magnetic repulsion exerts a force against the spring and provides a measurement of either DC or AC current. Moving  iron  vane  -  The  moving  iron  vane  meter  operates  on  the  principle  of magnetic repulsion between like poles.   The measured current flows through a field  coil  which  induces  a  like  magnetic  field  into  a  fixed  and  moving  vane causing  the  moving  vane  to  deflect  a  pointer  in  proportion  to  the  current  or voltage applied to the coil. ES-14 Page 4 Rev. 0







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