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11-09-2017, 11:02 AM

[b] [/b]Hi am munna i would like to get details on pmmc diffination in hindi pdf .

jaseela123d · 11-09-2017, 12:01 PM

The permanent magnet mobile coil instrument or PMMC type instrument uses two permanent magnets to create a stationary magnetic field. These types of instruments are only used to measure DC quantities, as if applying AC current to this type of instrument, the direction of the current will be inverted during the negative half cycle and, therefore, the direction of the pair gives the mean value of the zero torque. The pointer does not deviate due to the high frequency of its average position showing zero reading. However, you can measure the direct current very accurately.

Let's move on to the constructions of permanent magnet mobile coil instruments. We will see the construction of these types of instruments in five parts and are described below:

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