Resistance Checks on pg. 45 (K3)

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Resistance Checks on pg. 45 (K3)

Lane-2
Hi,

I hope this is the right place for this post, although I'm sure it's
not because its kind of a dumb question.

I've been assembling a K3 and I'm up to the point for doing resistance
checks in the assembly manual on pg. 44. And yet I know nothing about
resistance checks (or electronics).

I'm worried about the 1st check where I'm supposed to check the 12VDC
IN connectors on the rear panel. I bought a Fluke 117 DMM, switched it
to the Ohm sign, its set to auto ranging, then I put the black pin in
the black 12V connecter of the K3, put red on red (made sure the pins
are touching metal in the connectors) and I'm not seeing anything
(just 0L on the display of my DMM). And I've also stepped through the
manual range settings as well, but to no avail.

However the following checks on pg. 45 showed me some numbers. I can't
tell if they're good numbers yet as I'm trying to figure out the
decimal places and if they match what the manual says, but at least
there I'm seeing numbers.

So I was afraid to plug it in and do the initial power check.

Can anyone comment? Much appreciated.
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Re: Resistance Checks on pg. 45 (K3)

Don Wilhelm-4
Shane,

Let me try to help.  I have repeated part of the paragraph from page 44
of the manual:

"The resistance should be greater than 3K ohms. It may be much higher,
depending
upon which way you connect the leads. Your DMM may indicate the value is
so high it is out of the range of the instrument and as it does when in
ohms mode and the probes are not touching anything. If you are not sure,
refer to your DMM instruction manual to interpret the reading"

So you say your meter reads "OL" - whilch I would expect to mean
"Overload" which would likely mean a value that is higher than the range
the meter can read (consult your DMM manual to verify that).

The K3 instruction indicates that possibly the resistance may be so high
it is out of the range your meter is able to read - so I think that is
OK - assuming "OL" for your meter means greater than the range available.

Again check the manual for your DMM to properly interpret its readings.

If I had no further information, I would think you are OK to move
forward - but do know how your DMM displays overload conditions to be
certain - that information should be in your DMM manual.

73,
Don W3FPR

On 7/20/2011 9:27 PM, Shane wrote:

> Hi,
>
> I hope this is the right place for this post, although I'm sure it's
> not because its kind of a dumb question.
>
> I've been assembling a K3 and I'm up to the point for doing resistance
> checks in the assembly manual on pg. 44. And yet I know nothing about
> resistance checks (or electronics).
>
> I'm worried about the 1st check where I'm supposed to check the 12VDC
> IN connectors on the rear panel. I bought a Fluke 117 DMM, switched it
> to the Ohm sign, its set to auto ranging, then I put the black pin in
> the black 12V connecter of the K3, put red on red (made sure the pins
> are touching metal in the connectors) and I'm not seeing anything
> (just 0L on the display of my DMM). And I've also stepped through the
> manual range settings as well, but to no avail.
>
> However the following checks on pg. 45 showed me some numbers. I can't
> tell if they're good numbers yet as I'm trying to figure out the
> decimal places and if they match what the manual says, but at least
> there I'm seeing numbers.
>
> So I was afraid to plug it in and do the initial power check.
>
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Re: Resistance Checks on pg. 45 (K3)

Craig Smith


I have a functioning K3 here and also a Fluke 115, which is quite similar to the 117.

On the ohms range the meter reads OL.  On the Kohms range it reads about 4 Kohms.  

I think Don is right and it is OK to proceed.  If your reading was substantially LESS than 4 K I would be concerned.

73 Craig AC0DS


>
>
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Re: Resistance Checks on pg. 45 (K3)

AC7AC
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Re: Resistance Checks on pg. 45 (K3)

Lane-2
Thanks all. That was my crash course in resistance checking. The smoke
test went fine and the lights were fun to look at.
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Re: Resistance Checks on pg. 45 (K3)

KD3RF
In reply to this post by Lane-2
Hi Shane:

First, congratulations on acquiring and successfully putting together your K3.  You could not have chosen a better radio!

The guys here have given you some good advice, but I'd like to suggest one more thing if you haven't already done so, which is to join a local club and get yourself an Elmer -- an advisor -- who can teach you some basic electronics, how to use your test instruments, etc.

The ARRL ( www.ARRL.org ) is a good place to start, and specifically you can go to this page on their website to find a club nearby. ( http://www.arrl.org/find-a-club )

Be advised that different clubs have different areas of interest... some are repeater clubs, others are focused on contesting, and others are general interest / more diverse.

There are plenty of technically oriented members in these clubs and I'm sure you will find someone who will be more than happy to guide you along the way.

Best of luck to you and enjoy your K3.

73 de Andy, KD3RF / VE2DXY