Variac Build - Panel Meter
« on: February 16, 2018, 03:01:54 PM »
Hello friends,

I have been digging through some old threads but haven't been able to find the answers to my questions. Please forgive me if you've already answered this, but somehow I've missed it.

I'm building a variac for my test bench and have everything to complete the build save for a panel meter. I'm having trouble finding one that will work for what I want. Perhaps I'm just not thinking it through clearly.  It seems like anything that will be powered from the mains won't begin working until it sees about 80 VAC and other models  require some other voltage to operate.  Is there some other option that I'm missing? Can someone point me in the right direction?

Thanks in advance for your help.

Best,

Gus.
Cape Breton, NS
Canada


Brian Roth

Re: Variac Build - Panel Meter
« Reply #1 on: February 16, 2018, 07:54:56 PM »
I'm not understanding the question.  I have a DIY variac with AC voltage and current meters, and they were off-the-shelf many years ago...perhaps harder to find now.

Please elaborate....

Bri

Brian Roth Technical Services
Salina Kansas, home of the best vinyl on the planet!

http://www.BrianRoth.com
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Re: Variac Build - Panel Meter
« Reply #2 on: February 18, 2018, 08:12:57 PM »
I think I'm confused.

I don't understand what powers the meter.

This in the one I'm thinking about using - https://goo.gl/j8VVAK

I don't understand if it only turns on once it sees 80 VAC or if I'm missing something altogether.

Usually I don't feel this stupid.




shabtek

Re: Variac Build - Panel Meter
« Reply #3 on: February 18, 2018, 08:54:12 PM »
I did not look at that meters specs but assume it needs either an ac mains supply or some other low voltage ac or dc. Mains feeds the variac and the meter/ meter power supply. Get that before the variac, meter the output of the variac.
Ive only had analog meters on variacs, dont know how well that ammeter/ ct will work.

Consider fuses and ground/ground lift and a mains isolation transformer
"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ

Brian Roth

Re: Variac Build - Panel Meter
« Reply #4 on: February 18, 2018, 09:12:04 PM »
My hunch is that the AC mains powers the meter, and perhaps below 80 VAC the internal power supply poops out.

Like Shabtek, my DIY variac also uses two analog "wiggle needle" meters.

I think you need to keep looking around for different meter(s).

Bri

Brian Roth Technical Services
Salina Kansas, home of the best vinyl on the planet!

http://www.BrianRoth.com
recordingservicesandsupply.com/
www.qualityrecordpressings.com/
store.acousticsounds.com

Michael Tibes

Re: Variac Build - Panel Meter
« Reply #5 on: February 20, 2018, 03:18:07 PM »
My hunch is that the AC mains powers the meter, and perhaps below 80 VAC the internal power supply poops out.

Like Shabtek, my DIY variac also uses two analog "wiggle needle" meters.

I think you need to keep looking around for different meter(s).

Bri

I assume that the meters don't need any external power - if they are analog. In Germany I probably wouldn't attempt to diy such a device because they seem to pop up on ebay for very reasonable money. I bought one a long time ago with analog current and voltage meters which start from zero.

Michael