[Elecraft] K3 assembly, resistance checks

[Ron D'Eau Claire]

Sounds like a meter issue Mike. All you're looking for there is a short
circuit or not. The values given are those that should be the least on
normally sees due to normal currents through the circuits, but there are a
lot of solid state junctions in the transistors and i.c.s. It sounds like
your meter is supplying enough voltage to start to turn some junctions "on"
so they draw more current resulting in a lower resistance, then your meter
switches ranges to one with less voltage and they again turn "off" and so
on. 

Try using a manually-selected fixed range and see how it acts. 

Ron AC7AC



-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Mike Markowski
Sent: Tuesday, August 03, 2010 7:57 PM
To: Elecraft
Subject: [Elecraft] K3 assembly, resistance checks

Hi all,

In the K3 Assembly Manual Rev L, I reached the point of doing resistance
checks on pages 44 and 45.  Of the 4 checks all are fine except for U12.
 Instead of getting a resistance reading on my digital meter, it never
settles down.  It cycles through a range of values up through the Mohm
range.

Does this sound like a meter issue or a problem?

Thanks for any advice,
Mike ab3ap

Readings:

Across 12 VDC IN: infinite (should be > 3 kohms)
R36/gnd: 240 ohms (> 150 ohms)
U13/gnd: 424 ohms (> 150 ohms)

U12/+5V leg: cycles through readings
U12/+12V leg: 240 ohms
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