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anandchy
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Join Date: Dec 2010
Posts: 15

Analog Electrical Measuring Meters

06/20/2013 2:17 PM

On elctrical measuring meters some symbols are written.I understand the symbols for Moving coil and moving Iron.Also ac and DC symbols can easily be understood. But some symbols like "inverted T" , symbol of star in which 2 is written within, symbol of one sine wave and 1 written near it, Symbol of 3 sine wave and 1 written near it, and square wave symbol meaning is hard to understand. Kindly help.

Also please help in knowing where moving iron and where moving coil meters are used.
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redfred
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#1

Re: ANALOG ELECTRICAL MEASURING METERS.

06/20/2013 2:27 PM

It would help us if you identified the meter by manufacturer and model number, where these symbols are found on the meter, or provided us a picture of the meter with the symbols. Telling us only what you do not understand does not help us help you.

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jack of all trades
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#2

Re: ANALOG ELECTRICAL MEASURING METERS.

06/20/2013 2:51 PM

Can you provide a photo?

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TonyS
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#3

Re: Analog Electrical Measuring Meters

06/20/2013 9:08 PM

Inverted T is a moving coil meter.

The 2 in the star is its voltage in KV withstand to earth.

Square wave is either peak to peak or average.

The others you will have to post pictures of, but I think they refer to √2 RMS and peak voltage.

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harley
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#4

Re: Analog Electrical Measuring Meters

06/21/2013 9:49 AM

I hate pictograms. I don't know what half the switches in my car do.
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Electroman
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#5

Re: Analog Electrical Measuring Meters

06/21/2013 12:22 PM

There are many different symbols that can be on the scale of an analogue meter.

The inverted 'T' shows that it has been designed to be mounted vertically;

A star with a number indicates the basic accuracy of the movement so the 2 would be for a movement with 2% accuracy.

The sine wave with a number next to it is to show that it has been calibrated with a pure sine wave with a crest factor of 1.

The square wave is a puzzle, are you sure its not a sign indicating resistance? Especially of a shunt resistor used to extend the range of the meter.

Best I can do with the information ~ John.

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