September 7, at 1: The moving coil is mounted on an aluminium spindle. Now the reason is very obvious of inshruments two fixed coils instead of one, so that it can be constructed to carry considerable amount of electric current. They are clamped in place against the coil supports. Let I 1 and I 2 be the current in fixed and moving coil respectively. This instrument can measure AC as well as DC quantities. These springs act as leads to the moving coil. They are also used as a transfer instruments. Hence external magnetic field can interact with the operation field to cause change in the deflection, causing the error. The Electrodynamometer Wattmeter has two types of coils fixed and the moving coil. The damping torque is provided by air friction, by a pair of aluminium vanes which are attached to the spindle at the bottom. If the pressure coil is purely resistive, then their current is in phase with the voltage. Gype below shows an electrodynamometer ammeter. Electrodynamometer type voltmeters are the most accurate type of. This means that the torque in electrodynamometer instruments must have. An electrodynamic type instrument consists of Two Fixed Coil, flux is used in Electrodynamic or Electrodynamometer type instrument. A transfer instrument is one which is calibrated with a d.c. The electrodynamometer type instrument is a transfer instrument.
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