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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Nice graph. When the transformer saturates the current wave flattens into a square-like wave, top and bottom, and the peak responding, RMS calibrated meters are in error. When the SCR controllers first sppeared, we had to use moving iron meters to get measurements. Same with CVT's Their capacitor drove the cores close to saturation. This is what I use now to get the form factor and catch inrush peaks:
Fluke33
The Tong testers are still being made by Columbia-google them. However they dont look exactly like mine. Btw dont be tempted to use an AC clamp meter on a circuit with DC or a large DC component. You will have great difficulty prying the jaws open after the core gets magnetized, very embarrasing if the power csnt be shut off!.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
This is normal, an usual 230volt MOT draws 2-4A unloaded and around 20-25A arcing/shorted. The circuit breaker takes some time to "heat up" thats why it doesnt trip instantly (I can draw 20amps from a 10A breaker for several tens of seconds before it goes).
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Hehe, I had this same thing with me today. I was reading my meter on PEAK hold, and it said 24A, and I was thinking to my self, I'm testing a MOT at 70V on a 8A variac, to make sure it works. How the heck do I get 24A out of a 8A fuse. Peaks.
But ya, as Dr. Kilovolt said, Takes time to heat. 15A breaker should never pop at 15A, I think 30A is usually 5-10 seconds?
Registered Member #2915
Joined: Fri Jun 11 2010, 10:41AM
Location: Malaysia!
Posts: 101
Thank you very much for your replies! I was just slightly concerned for the integrity of the breakers. but your replies have put my anxieties to rest, thanks again! Nice graph by the way! I shall retest the MOT soon... On a different note (I hope this isnt considered too off topic) My resonant setup, Using 1 MOT, Another MOT as ballast, and 4 MOCs draws a nicer 11Amps, with a much bigger arc (about 10") as well!! Im getting 1.5Amps out, 11A in As opposed to: 0.5A out 24A in, Its amazing what resonance can do! Measured with an ancient 30 year old 'Avo', as accurate as ever to this very day!
Registered Member #2915
Joined: Fri Jun 11 2010, 10:41AM
Location: Malaysia!
Posts: 101
WOW! I am stunned, that is the exact model I have! actually my dad (somehow) has 2! I find them incredibly useful, very difficult to break, unlike the digis we have today... I have retested my clampmeter on my 110Amp welder and the reading is Aprox. 115A so I guess The MOT is drawing 24A then... Well, I'm supprised!
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MOT Draws 24AMPS, Not blowing 13A fuse/Tripping breaker?
