[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [TCML] Variac



Hey Jay...

Analog volt meters are pleantiful, Check out your local industrial supply center, if you do online shopping, check out Digikey,Mouser, Newark... Depending on face size, expect to spend between 15 - 50$

As far as the amp meter, there are 2 methods of measuring amperage. 1 way is to have a meter with a shunt rated for the voltage and amperage range. The shunt is a precision "resistor" which attaches to the meter and reduces the voltage going to the meter. Shunts are rated for specific amounts of current, for example 0-5A, 0-20A, 0-50A....

The second way to consider is the current transformer type. This uses a "circular" transformer which sends voltage to the amp meter. How it works is that the hot lead is placed thru the transformer and when current runs thru that wire the transformer picks up the current and creates a voltage in the outputs of the transformer thus sending the voltage to the amp meter. Altho this method is a bit more accurate and less prone to damage as compared to the shunt type, they are a bit more expensive... C.T. type meters are rated in a ratio value, meaning that the current transformer is matched to the amp meter for the intended amperage range.

Scot D



jhowson4@xxxxxxxxxxx wrote:

Hey guys anyone know where i could get a analog panel mount volt meter and an ammeter that would work well with my 0-140    20 amp variac

looked all over the web and i cant really find any rated for a high power like that.

thanks Jay H.
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla


_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla