2.5mm DC power plug ?

[Clint Sprague]

I'm drawing a blank on this question, even though I
have seen
the answer somewhere before.
 
I have a 2.5mm DC female coaxial power plug moled on a
cord.  One of the leads on the cord has a white line
... does this white line designate the center pin on
the plug?  12VDC needs to be on the center pin, so I
need to make sure I install the power pole connectors
on the power souce end correctly.

Thanks again for your replies,

73,
Clint - WS1V

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[John Lonigro]

Clint:
The while line might designate the positive lead, but why guess?  The
best way to check is with an ohmmeter.  The lead that measures 0 ohms
with the outer barrel would be the negative lead.  You can check the
inner connector while you are at it, to make sure there are no opens or
shorts anywhere.

John AA0VE

Clint Sprague wrote:

>
>I have a 2.5mm DC female coaxial power plug moled on a
>cord.  One of the leads on the cord has a white line
>... does this white line designate the center pin on
>the plug?  12VDC needs to be on the center pin, so I
>need to make sure I install the power pole connectors
>on the power souce end correctly.
>
>  
>

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[David F. Reed]

Clint,

you can either assume you are right (which I believe you are), or you
can very easily test it.

I recommend testing, in case you have an open or short at the plug; a
simple ohm meter test, or continuity tester (honker?) could save some
trouble down the road.
If an ohm meter is unavailable, just a simple series circuit would
suffice to determine the properties of interest.

73 de Dave, W5SV

Clint Sprague wrote:

>I'm drawing a blank on this question, even though I
>have seen
>the answer somewhere before.
>
>I have a 2.5mm DC female coaxial power plug moled on a
>cord.  One of the leads on the cord has a white line
>... does this white line designate the center pin on
>the plug?  12VDC needs to be on the center pin, so I
>need to make sure I install the power pole connectors
>on the power souce end correctly.
>
>Thanks again for your replies,
>
>73,
>Clint - WS1V
>

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[Bill Steffey NY9H]

i hate to think how many times I've had to pull out the
ohmmeter...  to test these frequently wired non-standard... with the
hot on the shell....

This year already I have blown up an infared headphone base station,
because of that ... even after I made the measurement , then grabbed
the wrong cable !!!!!

  it's another reason to have a meter in the drawer next to you....

bill

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