ELECTRO dynamometer type instrument:The magnetic field produced by the FIXED coils in the Electro dynamometer type instruments is weaker than in other types of instruments such as PMMC. It is nearly 0.005 to 0.006 Wb/m2. In d.c. measurements even the EARTH's magnetic field may affect the readings. Thus it is NECESSARY to shield an ELECTRODYNAMOMETER type instrument from the effect of stray magnetic fields.The stray magnetic field is around 0.0005 Wb/m2, which has a significant effect in the case of an electrodynamometer type instrument.Air cored electrodynamometer type instruments are protected against external magnetic fields by enclosing them in a casing of high permeability alloy.This shunts external magnetic fields around the instrument mechanism and minimizes their effects on the indication.

"> ELECTRO dynamometer type instrument:The magnetic field produced by the FIXED coils in the Electro dynamometer type instruments is weaker than in other types of instruments such as PMMC. It is nearly 0.005 to 0.006 Wb/m2. In d.c. measurements even the EARTH's magnetic field may affect the readings. Thus it is NECESSARY to shield an ELECTRODYNAMOMETER type instrument from the effect of stray magnetic fields.The stray magnetic field is around 0.0005 Wb/m2, which has a significant effect in the case of an electrodynamometer type instrument.Air cored electrodynamometer type instruments are protected against external magnetic fields by enclosing them in a casing of high permeability alloy.This shunts external magnetic fields around the instrument mechanism and minimizes their effects on the indication.

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Electro dynamometer type of instruments are enclosed in a casing made up of high permeability material to:

Electrical Engineering Indicating Instruments in Electrical Engineering . 7 months ago

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Shielding of ELECTRO dynamometer type instrument:The magnetic field produced by the FIXED coils in the Electro dynamometer type instruments is weaker than in other types of instruments such as PMMC. It is nearly 0.005 to 0.006 Wb/m2. In d.c. measurements even the EARTH's magnetic field may affect the readings. Thus it is NECESSARY to shield an ELECTRODYNAMOMETER type instrument from the effect of stray magnetic fields.The stray magnetic field is around 0.0005 Wb/m2, which has a significant effect in the case of an electrodynamometer type instrument.Air cored electrodynamometer type instruments are protected against external magnetic fields by enclosing them in a casing of high permeability alloy.This shunts external magnetic fields around the instrument mechanism and minimizes their effects on the indication.

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Posted on 15 Nov 2024, this text provides information on Electrical Engineering related to Indicating Instruments in Electrical Engineering. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.

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