[Test-Equipment] Repair HP410B (triax cable request)

[Robert Myers]

You say you 'may' need to refurbish the cable.  But you might want to see if
you can salvage the original cable.  

It has a rectangular molded polystyrene piece -- molded right on to it at
the end that is housed within that bottom metal plate -- that gray bottom
plate that covers the place where all the cables are soldered to the female
receptacles that are mounted on, and go through to the top of the upper
phenolic piece.   It is to provide a countering torque that will be required
during (the necessary) external portion of the cable's manoeuvring.  It is
to ensure no rotation beyond the entry point plug-in/out module.

Now, that same metal cover plate has sort of semi-circular holes in it that
'grip' the various exiting cables good and tight at that exit point --
tighter as the metal plate is tightened down against the phenolic top
portion of the small cable junction enclosure (the cable 'plug-in/out
module,' of the main HP-410B unit).  This also, is to prevent the user's
manoeuvring of the cables (during measurements) from causing a turning of
the cables within the plate/ phenolic enclosure that makes up that removable
'plug in unit' at the bottom of the HP-410B.  Turning inside would quickly
break the solder connections - as you can imagine).  But it alone, is not
enough to prevent turning of the triaxial AC/RF probe's cable - it needs
more.

The already mentioned rectangular molded piece is the additional measure
used to stop the triaxial cable from rotating (under the metal cover, that
is) and thus loosening, and eventually breaking the solder connection.  That
is the only cable with that molded piece.  It is required on that cable in
particular (and not the others) because that cable is stiff-'ish' and
turning it to measure something can easily translate into a high torque at
the solder point.  I the case of the cable, the tight exiting hole on the
metal cover are not sufficient.

If you open it up you will see what I mean.

Regards,
--- Rob
VE3JQL


-----Original Message-----
From: Test-Equipment [mailto:test-equipment-bounces at mailman.qth.net] On
Behalf Of David DiGiacomo
Sent: September-25-14 1:02 PM
Cc: Test Equipment
Subject: Re: [Test-Equipment] Repair HP410B (triax cable request)

On Thu, Sep 25, 2014 at 9:39 AM, Barry <n4buq at knology.net> wrote:
> I have an HP410B I'm going to refurbish.  As part of that process, I may
need to replace the triax cable that feeds the AC probe.
>
> I think Belden 9222 is a possibility; however, I don't find that online in
anything less than 100 ft. spools and at more than $1 per foot, that ends up
a bit cost-prohibitive.  Anyone happen to have any of that for sale (by the
foot)?  I think the original cable is about 4 feet long.


Would this work?

http://www.ebay.com/itm/36-Trompeter-P1A3T10PDB-36-Cable-Assembly-Triax-TRC-
50-1-BNC-M-TRC-M-NOS-/311087878350
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