Transformer Question

[Harry Bissell]

Hi Rene (et al)

There are two possible problems with the ohmmeter...

1) The readings are usually really small... takes a good meter to read
them...
If you have "relative" measurement capability (Fluke 8050 etc...) then its
easier...

2) If you are reading some really big Iron  (many turns, lot of core... like
esp. TUBE power supplies....) and you use a meter with a substantial battery
(like an old Simpson
260....) when you "remove" test lead you can get knocked right on your @ss!!!
Think
 "how many volts" is applied times the number of turns and.... bingo.

I had to do it three times... once for a surprise, twice "was that a charged
cap??", three...
Oh now I get it... ignition coil effect !!!

H^) harry  (I survived....)

Rene Schmitz wrote:

> At 04:01 27.02.00 -0700, --M wrote:
> >    I started building a power supply, its a kit from Jameco. I am
> >trying to figure out which is the center tap? There are 3 wires red,
> >black and blue. I am kinda figuring its the blue one but I thought I
> >would look for some wisdom from you all.
> >
> >--M
> >
>
> Hi Mitch!
>
> I use an ohm-meter to figure this out usually. The center tap is the one
> which gives you approximately the same reading to either of the other two
> wires.
>
> Bye
>  René
>
> opinionsexpressedher   | uzs159 at uni-bonn.de
> einarethatofmyemploy   | http://www.uni-bonn.de/~uzs159
> erandnotofmyself....   | http://members.xoom.com/Rene_Schmitz
>
>
>
>