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In Reply to: RE: a warning posted by RayP on December 03, 2016 at 04:33:53
Thanks for the warning, I will be sure to do that. I think my flukes are not really "true rms" even though they say so right on the front. I just hooked up one of the units to a variac, put a 12sn7 on the output for a load and put my fluke on it as well to see what I would get. The newer fluke, the 179 read about 300 mVac. The older fluke, the 79III read 1.5 vac. I am going to give my scope a try next and see if I get anywhere near the 12vac I was expecting. I am going to have to by the right sized cap as well, don't seem to have one lying around.
One last question (for now : ) at least). My unit has both diodes on one side of the caps. Does it make any difference which pair of diodes I hook up too? Thanks!
Edits: 12/03/16Follow Ups:
Vinnie, the Fluke manual for the 179 gives accuracy for ACV 45Hz to 500Hz is 1% and 500Hz to 1kHz is 2%. They don't give any figures beyond 1kHz for accuracy. It is standard practice to measure higher frequencies with a scope.
That explains it, but see my new post above. I am still floundering. Thanks.
Edits: 12/03/16
The positive connection with the orange wire.
The negative connection with the blue wire.
On my units there are two diodes on each side that form a bridge. They are connected at the edge and you should be able to use either of them to solder your wire to.
ray
You should raise the output freq
Great photos! Thanks!
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