[time-nuts] HP 5065A questions

Magnus Danielson magnus at rubidium.dyndns.org
Thu Feb 5 21:11:54 UTC 2015


Joe,

Using the front panel, turn the knob and notate the readings for all 
locations, we can help you from there.

Cheers,
Magnus

On 02/05/2015 06:01 PM, Joe D'Elia wrote:
> Whilst mainly a voltnut I have often turned to this forum for answers on the
> telecom sourced rubidium oscillators and have two units that I use for
> keeping my counters honest. However recently I was browsing in the
> scrap/redundant shelves at a local calibration lab and came across an
> HP5065A carcass, no top and bottom cover, the right front handle had been
> sheared off, the chassis by the transformers was buckled and the lid of the
> physics package was also buckled and had a quarter inch gap around a third
> of the circumference. However it had a very nice HP10811 oscillator and the
> size of the physics package made it very tempting for a teardown. So I duly
> paid the £20 they wanted and took it home with no expectations that it
> worked. On powering it on there were signs of activity on the Circuit check
> meter so I left it for an hour and then went through the startup process and
> the lock light came on! Now I'm in a quandary as I hadn't intended to add it
> to my stock but I can't let such a beautiful piece of engineering be
> cannibalized. So to the point of this missive
>
> How do you tell the state of the Rubidium lamp in the 5065A? there is no
> mention of ageing in the manual and I'd like to know there is some life in
> the unit. It's a late 88 build and has spent the past twelve or so years
> since it's accident on a shelf.
>
> Secondly since I turned it on it's gone from being 3 millihertz below
> nominal to +24 millihertz. That's over six days and the rate of change is
> slowing down so I'm going to let it run until it's stable and then try the
> adjustment procedure. Before I do that should I try mending the Physics
> package lid so that it's sealed, could that be the cause of the drift?
>
> I look forward to your responses as I set out on this unintended journey.
>
> JoeD
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