[Elecraft] Fwd: K3 Assembly Resistance Check is low

[Brian F. Wruble]

OK, I read the archives.  The consensus seems to be that DMM's can have
inaccurate measurements in this circuit.  I powered up, and no smoke.
 Everything lights up like it is supposed to.  Onward!

Brian


*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278







---------- Forwarded message ----------
From: Brian F. Wruble <bwruble at gmail.com>
Date: Sat, May 18, 2013 at 1:25 PM
Subject: K3 Assembly Resistance Check is low
To: Elecraft Reflector <elecraft at mailman.qth.net>


My K3 fails the test on page 45 of the assembly manual.  The resistance
from a pin on U12 to ground is 447 ohms.  One of you asked a question ...
was the reading the same with the leads reversed?  The answer is no, that
reading is about 4.5 kohms, and it acts like the meter is charging a
capacitor in that direction.  It takes a long time for the meter reading to
settle down.

I put a fresh battery in the Fluke DMM, and I also tested a batch of 5%
tolerance 1/4 watt carbon resistors I had.  They all read a little low,
none read high, but none were low outside the 5% tolerance.

So, my reading of U12 to ground is 10% low.  The manual is pretty clear
that the resistance must be >500 ohms.

What is my next step?

Thanks.

Brian W3BW


*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278