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 … Read more
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 … Read more
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 … Read more
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 … Read more
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 … Read more
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 … Read more
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 … Read more
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 … Read more