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Which instrument has the highest frequency range with accuracy within reasonable limits?

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Which instrument has the highest frequency range with accuracy within reasonable limits?
  • APMMC
  • BMoving iron
  • CElectrodynamometer
  • DRectifier
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Rectifier instrument has the highest frequency range with accuracy within reasonable limits. These instruments are nothing but permanent magnet moving coil instruments used in conjunction with rectifying device for AC measurements (current and voltage) from about 20 Hz to 20 kHz.