Vibrating Reed Mechanical Resonance Type Frequency Meter

The vibrating reed type frequency meters or mechanical resonance type frequency meter indicate the supply frequency of the circuit directly and are very much convenient for most practical purposes.   The vibrating reed frequency meter is a very simple instrument and has got an advantage of giving reading free from errors due to change in …

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Range Extension of Ammeters | Voltmeters

There is no fundamental difference in the operating principles of ammeters and voltmeters. Both are current operated devices (except electrostatic type voltmeters) i.e. deflecting torque is produced when current flows through their operating coils.   In an ammeter, the deflecting torque is produced by the current to be measured or by a definite fraction of …

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