RE: [TCML] NST Measurements

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

I have a HV probe for my DMM, and a 100 ma analog panel meter. I measured several 15/30 Franceformer NST's and if I recall, I always got really close to 15 kV with no load. When the NST's were dead shorted through the ammeter, I got really close to the rated current. So it appears you get 15 kV at zero ma, and 30 ma at 0 kV.

Adam


--- On Thu, 1/22/09, Lau, Gary <Gary.Lau@xxxxxx> wrote:

> From: Lau, Gary <Gary.Lau@xxxxxx>
> Subject: RE: [TCML] NST Measurements
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Thursday, January 22, 2009, 8:09 AM
> Maybe the question I really want to ask is - under what
> conditions will a 15/30 NST deliver 15kV AND 30mA?  Is that
> even possible?  I would have assumed that with a
> "proper" load, Vload would be 15kV and would draw
> 30mA.  Could it be that the open circuit voltage really is
> supposed to be something much higher but settles down to
> 15kV under load?  
> 
> You mention that "30mA would drop the voltage very low
> ".  If that's true, then we should never be able to
> draw anything close to the faceplate-rated power from an
> NST.  Have you measured this?  Or does the faceplate VA
> rating reflect just what is being pulled from the wall, with
> much or most of that being dissipated as I2R losses in the
> core?
> 
> Sorry for all the question marks, but it appears that our
> understanding of NST's is not as good as we had assumed.
> 
> Regards, Gary Lau
> MA, USA
> 



      
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