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

Re: MOT testing

Original poster: "Dale Nassar by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dnassar-at-i-55-dot-com>

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 variac
>while monitoring the voltage drop across the resistor. In this case 1 volt
>equals 1 ma.
>Maybe put two 1000ohm 100watt resistors in parallel to handle the wattage? 1
>volt should equal 2 ma.
>Rick W.
>Salt Lake City