[Elecraft] K1 RF Board - Resistance Checks

[Joseph M. Durnal]

It is a DMM - sorry.  $3 hamfest special, no brand, but it says model
DM-301 on it!

Thanks - you've sort of answered my question about the waiting about a
second to get a reading too.

73 de Joseph Durnal NE3R

On Jan 30, 2008 2:44 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:
> Joseph,
>
> You said you were using a VOM to measure resistance, and that may be your
> problem.  Many VOMs use a battery voltage when measuring resistance that is
> high enough to turn on solid state devices and can even destroy them.
>
> Use a DMM for better results.  Even the $5 to $10 ones perpetually 'on sale'
> at Harbor Freight Tools will give good results - cheap DMMs are accurate,
> they do take more time for the readings to settle down than the expensive
> ones, but if you wait about a second, they will tell you the correct story.
>
> 73,
> Don W3FPR
>
> Joseph M. Durnal wrote:
>
> Well that is a big help! Thanks. At least this time I know how to
> count the
> pins on an IC, when I built the Filter board, I didn't but
> assumed I did and
> was very confused.
>
> Pin 3 starts at about 20k for a second or less then
> jumps to well over 50k.
>
>
> Thanks & 73 de Joseph Durnal NE3R
>
> On Jan 30, 2008
> 2:09 PM, Strode, Carl R <Carl_R_Strode at rl.gov> wrote:
>
>
>
> U4 pin 4 reads only 0.4 ohms - I think I have a problem here, but I have no
> idea what it could be, the manual said it should be > 50k.
> The schematic
> seems to show it as a ground.
>
> You should be checking U4 Pin 3
> Pin 4 is
> indeed ground.
>
>
> Carl Strode
> WA7CS
>
>
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