Re: wierd MOT's

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <A123X-at-aol-dot-com>

I had suspected it might be something like that. Well for now I'll just 
assume the voltage rating on the MO capacitors is what the output voltage is 
which means my MOT's are a bit on the low output side but no matter since I 
have both a triggered gap and an async rotary that I'm going to try.

Mark


In a message dated 7/25/02 6:43:41 PM Eastern Daylight Time, tesla-at-pupman-dot-com 
writes:

<< I ran into something like what you are describing.  i wanted to
 test my 12kv/30ma nst with my meter without a hv probe. so, i thought like 
 you did... drop the voltage rather low and measure the output.
 however i received the same results that you did, unusually low output on 
 the secondary. i also tried using a AA battery and touching the primary 
 leads quickly. same results, lower expected voltage.
 
 FIRST... dont do that again, go buy a hv probe. analog meters are more 
 durable than digital, but if you go over the voltage range you'll toast any 
 meter.
 
 second... i suspect that the primary is designed to operate within a 
 specific voltage range. 12v is way below that im assuming. thus the field 
 strength of the primary wasn't strong enough to drive the secondary 
 efficiently. once you hit 60v, the voltage on the secondary likely 'took 
 off' and blew your meter.
 
 how about running the xfmr in reverse? 120vac to secondary, measure voltage 
 on primary? would the windings handle it? hmmm...
 
 standard meter -- 10 meg ohm impedance.
 120vac into secondary - (assuming mot has 2.4kv out, ratio is 20:1)
 120/20=6vac.  Apri=120/10^6 =12ua. Asec=12ua*20=240ua.
 secondary should handle at least 500ma-1000ma.
 
 this should work. am i correct?
 larry d. >>