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Types of Instruments

Types of Electrical Measuring Instruments

September 10, 2019February 5, 2019

Absolute Instrument Secondary Instrument Indicating Instrument Recording Instrument Integrating Instrument We use various types of electrical measuring instruments in electrical engineering and science fields. We primarily categorize these measuring instruments as the absolute instruments and …

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Permanent Magnet Moving Coil Instrument (PMMC)

July 2, 2019February 8, 2019

This is a variation of moving coil instruments. There are two types of moving coil instrument. One is permanent magnet moving coil instrument and another is dynamometer type instrument. We will discuss in this article …

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Moving Iron Instrument Working Principle and Errors

July 2, 2019February 7, 2019

Working of Moving Iron Instrument A current-carrying coil always produces magnetic flux around it. If we place a piece of soft iron nearer to a current carrying coil it will attract the iron piece. Instead …

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Induction Type Instrument Working Principle and Types

September 12, 2019February 11, 2019

We use induction type instrument for AC measurement only. This is because the induction phenomenon only occurs in AC. An induction instrument has multiuse. For example, we use the instruments as ammeters, voltmeters, wattmeters, and …

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Dynamometer Type Instrument and its Working Principle

September 12, 2019February 10, 2019

The basic working principle of a dynamometer type instrument is somewhat similar to that of a permanent magnet moving coil instrument. The only difference is that here instead of using permanent magnet we use a …

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Rectifier Type Instrument Construction and Advantages

August 24, 2019June 26, 2019

A rectifier type instrument measures alternating electrical signal by means of D.C measuring instrument. As the name implies, this instrument first rectifies an A.C signal to D.C then measures. Although it measures the rectified A.C …

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Hot Wire Instrument Construction and Working

July 2, 2019February 9, 2019

Working Principle of Hot Wire Instrument The working principle of a hot wire instrument is quite simple. We can well understand if we look into the constructional details of that instrument. Here we fix one …

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Thermocouple Instrument Working and Construction

July 6, 2019June 25, 2019

In the thermocouple instrument, we join two wires of two different materials together. Hence, there will be two junctions. If the temperature of these two junctions is different, there will be a current circulating through …

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