[time-nuts] Ventilation of HP 58503A GPS time & frequency reference receiver

Pete Lancashire pete at petelancashire.com
Mon Dec 15 01:05:02 UTC 2014


And 'scope probes :-)
On Dec 14, 2014 12:59 PM, "Bob Camp" <kb8tq at n1k.org> wrote:

> Hi
>
>
> > On Dec 14, 2014, at 3:50 PM, Scott McGrath <scmcgrath at gmail.com> wrote:
> >
> > Much of the Malaysian Agilent gear uses this style of case with a
> wraparound bumper in place of the system II feet and feet are removed when
> gear is rack mounted.
> >
> > One of my best surplus buys ever was a huge crate of mixed mounting
> hardware feet / rack flanges etc I've been using that box o stuff for 10
> years
>
> Somewhere there’s a building full of gear all of which is missing it’s
> feet and bumpers …
>
> You are lucky to have found that box. In most cases they get tossed out
> with the trash. The same is true of many of the fancy i/o cables, they get
> put into the copper recycle pile and are gone…
>
> Bob
>
> >
> > Content by Scott
> > Typos by Siri
> >
> >> On Dec 14, 2014, at 3:09 PM, Bob Camp <kb8tq at n1k.org> wrote:
> >>
> >> Hi
> >>
> >> The desktop version (with handle) used the rubber “bumper” wrap around
> for feet. The bumpers got pulled when they were rack mounted. The ones that
> got put back on may or may not be identical to the originals. That’s a very
> normal part of the surplus process. The 100% correct HP original case on
> the box as HP built it did not use the clip on feet.
> >>
> >> The reason for this is pretty simple. The Z3801 / Z3805 came before the
> “instrument” versions of the same products. The internal case structure is
> same/ same. The instrument simply gets a gray sheet metal jacket that fits
> around the Z38xx box. That’s the way HP designed it. Since its just a
> jacket, it gets feet as part of the bumpers. Most of these (likely 99%) got
> rack mounted and the feet / bumpers were tossed. I have a *lot* of very
> legit surplus HP gear that did not come with feet or bumpers.
> >>
> >> Bob
> >>
> >>> On Dec 14, 2014, at 2:46 PM, Dr. David Kirkby (Kirkby Microwave Ltd) <
> drkirkby at kirkbymicrowave.co.uk> wrote:
> >>>
> >>> On 14 December 2014 at 19:32, Bob Camp <kb8tq at n1k.org> wrote:
> >>>
> >>>>> There are not the usual 3 holes underneath where feet go.
> >>>>
> >>>> I understand that they are different. The problem is the same though.
> Pulling a box in and out of a rack with feet or bumpers on it is a pain.
> They often get “lost” early in the instrument’s life. Often it’s a standard
> process on all gear as it comes into the facility.  All of the un-needed
> bits and pieces go into a big pile. When the feet (or whatever) are found
> later in life they may or may not be re-installed correctly. They might not
> even be the ones that came with the instrument.
> >>>>
> >>>> Bob
> >>>
> >>> I am not sure if you are following me. On most (all??) HP kit I have
> >>> seen, there are 3 holes at each corner of the bottom, where is
> >>> possible to fit feet if one is going to use it on a desktop, rather
> >>> than a rack. This unit does not have those holes, so it would be
> >>> impossible to fit the usual HP feet on it.
> >>>
> >>> Looking around, I have 15 bits of HP kit,  all of which have holes in
> >>> the corner for feet. But this 58503A, with the Chinese box, does not
> >>> have the holes. I don't know whether the 85053A is supposed to have
> >>> them, or whether this is just a flaw in the design of the counterfeit.
> >>>
> >>> Dave
> >>> _______________________________________________
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> >>
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