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Re: MOT Voltage Doubler Fault in your theory



(There are transformers that are rated 3 kV which put out about 1.5 kV
RMS, and 4 kV rated transformers which put out a nominal 2.1 kV RMS.)

<SNIP

NO, Dave !!! That isnīt true (at least not for germany and the MOT
below).

I actually measured a 2.3kV-at-700mA (rated) MOT and it puts out 2300 volts
!!

The type was a Gardner U.K. type with 220 v input. At 110V input my
meter read
1175 volts (aprox half) at 175v input it read 1835 volts. At full input
(230v)
it smoked my meter. My last reading (before it went zappp and smoked
rose) was
around 2100 volts. Max allowable input was 1500 volts... so my fault).

If your theory was true I would have been able to put in 230V and my
meter
should have read somewhere around 1650V and stayed
alive................. But
it didnīt!!!



Oh, yes... it was a direct RMS reading meter.....

BTW: How did you come about that a 4kV xformer would have only 2.1kV
RMS. This
would be a 3kV rated xformer. A 4kV rated xformer would have 2800 volts
RMS.

Right out of the Global catalog. Actually I probably should not have
used the word "rated"
for the 3 K and 4 K labels, that is how they are listed. Of the four
"replacement" transformers
in common use, two are 3000 volt (nominal 1.5 kV, usually measures less,
but if it happens to be
an OEM transformer it may measure more) one is vertical, the other is
horizontal. Dito for the 4000 volt.
The MOT that I have here on my desk is made by Advance Transformer
company. Cat. number
09-104-1B. Acording to the manufacturers specs it is supposed to put out
2.1 Kv at 500ma. It has a label
on it that reads Warning 4000 volts. Its actual measured output is 1875
volts at 125 going in. (standard DMM,
not true RMS reading.) Rating is for nominal 117 volts. Out here in the
country, we have 125 out of the wall.
In town we get 120. I have seen some transformers that may be close to
what you have in some older commercial equipment. Now days they use the
same parts in the commercial stuff as they do in the domestic
appliances.
BTW this is not my "theory". Just the way the appliance industry does
business in the good ol' USA.

[ wouldn't it be nice if you could really get 2800 volts out of a
microwave transformer?]


Later,
deano


coiler greets from germany,
Reinhard