[time-nuts] 5061a tech question

sebastian stolp sebastianstolp at gmx.net
Wed Feb 8 10:29:49 EST 2006

hello chuck,
thank you for your mail - i went right into the shop for those 0,8 fuses.
the thing works properly (on the quartz for the time being), the cesium 
has to be treated as the clock has been in a warehouse for years not being 
used. i have to restore the vacuum first and i'm looking for the device to 
do that. i believe it's the little hp degausser. sometimes one comes up on 

your'e still on my list to nag about the oscilloquartz 3210 thats in your 
posession. if i can't tempt you moneywise, perhaps you might be interested 
in a swap: i have a oscilloquartz/sercel eudics 3200 digital cesium 
frequency standard with 3 manuals (on in english) and software.
maybe youre interested...

here's some introduction on what i do with the cesium equipment:

Sebastian Stolp.
A collection of high precision clocks

I started this collection in the late 1990s with a passion for the first 
electronic clocks from Patek Philippe in scientific equipment 19’’ racks 
and table cases. Equipment like this at the time provided exact time for 
e.g. banks, insurance companies or train stations and airports worldwide. 
These clocks are a breed apart from what the middle-of-the-road watch- or 
clock collector would consider, or manage to get hold of. They were 
already old-tech by the time cheap radio controlled devices were mass-
produced that could easily outperform the pateks on every level of 
precision and synchronisation.
These early electronic Patek clocks are the founding part of the 
collection, that has expanded since.

Today, the collection reaches into the field of rubidium- and cesium 
frequency standards and clocks, such as Hewlett Packard early rubidiums 
and cesiums,  the HP 5065a, and the HP 5061A/B
As it is a swiss collection it will also focus on swiss cesium frequency 
standards from oscilloquartz, former Ebauches, Neuchatel. this includes 
early models like the OSA 3200 and the OSA 3210, but also quartz standards 
(OSA 2200), because they played a important role in meeting the 
synchronisation requirements of the upcoming telecom industry of the early 

best regards,

> --- Ursprüngliche Nachricht ---
> Von: "Chuck Norton" <chuck at frequencystandards.com>
> An: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Betreff: Re: [time-nuts] 5061a tech question
> Datum: Tue, 31 Jan 2006 15:47:46 -0700
> Hi Sebastian:
>     The ones made in the eighties used a 0.8 amp fuse for the 230 volt
> setting.
> I know Manuals Plus has a web site and carry a lot of manuals. Don't 
> if
> they have this one or not. To get the most accurate manual, you should
> look
> look for one that covers the first 4 digits of your units serial 
> This is called the series number. All HP manuals have this listed on the
> inside, usually on the first or second page. If you get a manual that
> covers
> a higher series than yours, it will have backdating information in it. 
> you get one lower, it can be quite a bit different from the one you 
> They made a LOT of revisions on these and quite a few different manuals.
> Chuck
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> time-nuts at febo.com
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