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Re: MOT testing
Original poster: "PotLuck by way of Terry Fritz <twftesla-at-qwest-dot-net>" <potluck-at-xmission-dot-com>
A MOT can output much more than 30ma.
Let's suppose a particular MOT can output 1/3 amp.
.33 amps X 1000 ohms = 330 volts
330 volts X ..33 amps = 109 watts
If a MOT can output more than 333 ma then overheating will occur. Granted,
the test will be run a very short time but I have the resistors.
I simply want to know if the shunts work indentically as NSTs in that the
output can be heavily loaded on a MOT without damage. I was using the 15/30
NST as an example as to how I've been testing NSTs. Now I'd like to test the
MOTs I have for current capabilities.
Salt Lake City
----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
Sent: Sunday, May 26, 2002 10:47 PM
Subject: Re: MOT testing
> Original poster: "Dale Nassar by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> Why are you increasing the wattage--Is it for voltage reasons--It cant be
> because a 15/30 NST is overheating a 100W 1kOhm resistor. I have tested
> 15/30 NST's with a TINY 1/4 watt resistor!!!!
> From standard formulas:
> 30mA -at- 1000 Ohms (I*I*R) dissipates only 0.9 watt--a watt 1 resistor holds
> a 15/60 NST imposes 3.6 Watts.
> Looks like you need to go DOWN to 5W >>not UP to 200W<<
> --dale nassar
> At 09:10 PM 5/26/02 -0600, you wrote:
> >Original poster: "PotLuck by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> >Hi all,
> >Can a MOT be tested for current the same way an NST is tested?
> >I've tested my NSTs (15/60s and 15/30s) by connecting a 1000 ohm 100watt
> >resistor to one secondary then ramping up the primary voltage with a
> >while monitoring the voltage drop across the resistor. In this case 1
> >equals 1 ma.
> >Maybe put two 1000ohm 100watt resistors in parallel to handle the
> >volt should equal 2 ma.
> >Rick W.
> >Salt Lake City