[Elecraft] Resistance Checks Advice
Francis Belliveau
f.belliveau at comcast.net
Sat Jul 2 15:02:52 EDT 2005
On: Saturday, July 02, 2005 2:42 PM
"tom.w3qs" <tom.w3qs at verizon.net>
> ...
> I had done the checking by probing with the common lead while the other
lead
> was grounded. I reversed the connections, and now all checks are within
> normal range. Many of the other checks are different, now, but they had
> been in-range before.
> ...
This error has been made before. Polarity of resistance checks do not
normally make a difference because you are probing a pure resistance.
Circuit checks are different because there are actually active components
that will act differently depending upon the polarity and magnitude of the
voltage applied by the DMM. This is also the reason that Auto-Ranging is
not recommended. Use the correct range for the expected reading and
readings will often look closer to what the manual indicates.
This comes up often enough that maybe there should be a builder's note in
the manual.
73,
Fran, KA4FRH
K2 s/n 314
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