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Greenthumbs

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Joined: 05/12/2008
Location: Australia
Posts: 40

Posted: 10:27am 28 Dec 2010

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Hi everyone,
I was wondering if anyone out there knows what the symbols on the front of analogue meters mean?
Is there a web page which explains them?
This is a maximum demand amp meter.
The markings 15min means the needle on the right is the average amps over 15min.
The red needle is the maximum amps ever recorded since reset and the needle in the curved windows is the current amp reading.

But I don't know what the other symbols mean.
I can not find any info on the symbols on the net so I was wondering if anyone else could help.

Regard
Damo

Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5116

Posted: 11:46am 28 Dec 2010

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I think this is a bi-metal strip meter. The symbol that looks like a black and white line on top of each other, bent up in the middle, could mean bi-metal. The symbol to the far left could be its heating element.

Bi-metal meters are common for measuring current where a fast response time isn't needed. Most 20 year plus old cars use them for their fuel/temp guage, which is why the guage take a few seconds to drop back when you turn the ignition off.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

Tinker

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Joined: 07/11/2007
Location: Australia
Posts: 1904

Posted: 02:01pm 28 Dec 2010

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Further to what Gizmo said, the symbol to the right of the bi-metal bit tells the meter is for AC, 3 phase, the upside down 'T' means its for vertical mounting only and the '2' inside the star says it has a 2KV test rating.

I have not come across bi metal meters for a long time, I might dig out my old text book I kept from technical college many years ago and refresh my memory

what all these symbols mean. Nowadays with digital meters so common the symbols on analogue meters are becoming ancient knowledge.
BTW, I think the '1.5' means the meters accuracy, 1.5% of full scale deflection.

Klaus

brucedownunder2
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Joined: 14/09/2005
Location: Australia
Posts: 1548

Posted: 08:52pm 28 Dec 2010

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Thanks Guys ,,,, I spent at least 1-2 hours yesterday on the internet and IRC trying to locate a explanation of these strange symbols. There seems to be lots of them ,maybe the manufacturers make up their own symbols years ago . Strange that none of these symbols are to be found on Google.

I got that nice meter reading yesterday variable power supply set around 11volts and a variable 5k Ohm trim pot ..Thanks Ross .

Bruce.

Bushboy

vasi

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Joined: 23/03/2007
Location: Romania
Posts: 1697

Posted: 10:17pm 28 Dec 2010

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brucedownunder2 said ... Strange that none of these symbols are to be found on Google. ...

Well, you can find them now

Good to know these things. Old technical agenda are gold.

Vasi

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Greenthumbs

Regular Member

Joined: 05/12/2008
Location: Australia
Posts: 40

Posted: 02:35am 29 Dec 2010

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Hmmm text books, now that is a good idea I have plenty of them in the back room. Hadn't thought of that. Once upon a time they did use paper to make books.

I shall retrieve them and look

Thanks Glenn and Klaus

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