Re: OBIT Test Problem (reformatted) (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 22 Oct 2007 17:47:30 EDT
From: FIFTYGUY@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: OBIT Test Problem (reformatted) (fwd)

 
In a message dated 10/22/07 5:20:56 P.M. Eastern Daylight Time,  
tesla@xxxxxxxxxx writes:

> I  was running  some tests today on a 10 kV, 23 mA OBIT I picked up for  
$1.00
> at a yard  sale.
>
> First I powered it with 0  to ~140 V on the HV side and  read the LV  side. 
I
> then  multiplied both readings by 100 which I  thought would give me   
fairly
> representative response curve for the   transformer.
>
> I then applied 0 to ~ 60 V on the low voltage  side  and read the  HV side 
with 
> my trusty Triplett  630-A meter, which  has a built in 0-6000 VAC  scale ,  
and
> compared the results to the  first test. NOT EVEN  CLOSE!
> (See results below) what am I   missing?


 
    Just a guess?
 
    That Triplett is an older analog VOM? From what I  gleaned from a Web 
search, it has around a  5k to 10k Ohms/Volt sensitivity  on the AC Volts 
settings? Could the OBIT be such a high-impedance source that  your meter is "pulling 
it down" at the lower voltage settings? 
    Maybe re-check with a good digital? Second opinion,  if nothing else...
 
-Phil LaBudde
 
Center for the Advanced Study of Ballistic  Improbabilities



************************************** See what's new at http://www.aol.com