So I put dmm in amp mode, switch probe leads to 10 amps plug, current Xformers over the cord or just the hot wire? And if it is running 25 amps I would see 2.5 amps on my meter?
Sent from my Samsung GALAXY S5™, a Cricket 4G LTE smartphone
-------- Original message --------
From: David Speck <Dave@xxxxxxxxxxxxxxxx>
Date: 09/02/2015 23:13 (GMT-06:00)
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] Power factor correction
John,
Check out eBay for a current transformer. A 50:5 unit will multiply
your DMM readings by factor of 10. They should be available for under
$20 with some diligent looking.
Something like the following would work. (no connection to seller.)
http://www.ebay.com/itm/130895906892
Just be careful to never put current through the transformer (CT)
without having a load, like your DMM on its amperes setting, across the
CT terminals. When unloaded, a CT tries to put out infinite voltage
which may break down its internal windings.
Then, you can investigate which arrangement of PFC caps works best for you.
Dave
-----------------------------
I'm at the point I need to add some motor run caps, I'm thinking the
same that go on your ac units in the 40-50uf 330-440v variety unless
someone has a better suggestion. Looks like I will need around 150uf
per transformer I have 3 12/60 NST. Biggest question is do I run all 9
parallel or run about 3 strings of 3 to each? Would before or after the
EMI filters make a difference. Blowing 20 amp fuses on variac, don't
have a clamp meter and my dmm is only good to 10 amps inline. I was
going to add some and then start measuring the current? John Cooper
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