[time-nuts] AC Connector On HP 5061B

Scott McGrath scmcgrath at gmail.com
Thu Oct 2 10:29:25 EDT 2008

Was this the pretty one on Ebay?  - you really, really need to open it
up at least to ensure nothing came adrift in shipping, I'll second Tom
on the sheer coolness of the 5061B but also remember most of the
components in a Cesium beam fall under the category of "Unobtainium"
so you will want to ensure everything is as it should be.

You will want to follow the preoperation checklist which can be found here


On Thu, Oct 2, 2008 at 9:56 AM, Tom Van Baak <tvb at leapsecond.com> wrote:
>> I recently acquired an HP 5061B (Options 3 and 4). The system
>> came without an AC cable.
>> I can easily make a replacement cable for the system. However,
>> I need to know the pin assignments. I can open the unit to look,
>> but if someone has the answer it would save me the hassle.
> You just got a 5061B and you don't want to open it? It is so cool
> looking inside, how can you resist?
> See the pin assignments in the 5061 manual:
> http://www.leapsecond.com/museum/hp5061a/5061a.pdf
> But, NEVER, make a power cord for something as precious as a
> 5061 without actually checking pins from the inside. On some
> models 5065/5061 that I have HP switched the pin assignments.
> See, for example,
> http://www.leapsecond.com/museum/hp5065a/conn.htm
>> Each of the pins on the jack at are assigned a letter. "G", "A", and "B" (I think).
>> "G" is ground as it is connected to chassis (confirmed with am ohmmeter).
>> Does anyone know which of the other two pins is AC hot and which is AC neutral?
> The other way to check it is pull the fuse and measure which pin
> is connected to the ends of the fuse holder.
> /tvb
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