[time-nuts] AC Connector On HP 5061B

Jeffrey Okamitsu w3kl at w3kl.com
Fri Oct 3 12:35:03 EDT 2008


Scott.  Yes, I'm working on acquiring a DA.  I'm also considering homebrewing one.  I've been watching the thread on the NIST design.
 
Jeff

Jeffrey K. Okamitsu, PhD, MBA
+1-609-638-5402

--- On Fri, 10/3/08, Scott McGrath <scmcgrath at gmail.com> wrote:

From: Scott McGrath <scmcgrath at gmail.com>
Subject: Re: [time-nuts] AC Connector On HP 5061B
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Date: Friday, October 3, 2008, 10:09 AM

You need one other piece of gear then.   A dIstribution amplifier if
you do not already have one - they come up pretty frequently on ebay
and there is a thread on building the NIST reference design ongoing
the thread title is "homebrew 13 dBm distribution amplifier based on
NIST design 5 to 100 MHz"

On the DA you will want to ensure all your output cables are of
identical length as this will ensure that all signals are in phase at
the timebase input(s).   It's a small thing really a fraction of a
picosecond but it's there and easily compensated for.


On Thu, Oct 2, 2008 at 3:04 PM, Jeffrey Okamitsu <w3kl at w3kl.com> wrote:
> Scott.  Thanks for the information.  Tsuchiya-san provided the part number
for the connector and I have already ordered one from Powell.
>
> I am looking forward to getting the unit up and running and providing a
stable 10 MHz from which I will lock all of my frequency sensitive test
equipment. (spectrum analyzer, network analyzer, synthesized signal generator,
and frequency counter).
>
>
> Jeffrey K. Okamitsu, PhD, MBA
> +1-609-638-5402
>
> --- On Thu, 10/2/08, Scott McGrath <scmcgrath at gmail.com> wrote:
>
> From: Scott McGrath <scmcgrath at gmail.com>
> Subject: Re: [time-nuts] AC Connector On HP 5061B
> To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
> Date: Thursday, October 2, 2008, 2:11 PM
>
> No I bought a 5061A a few weeks before unfortunately it has issues
> some of which are traceable to improper packing.   I'm surprised you
> did not buy the power cord (i did) on ebay.   The Cannon connectors
> are expensive but they can be had from Powell Electronics here in
> Massachusetts.
>
> I think someone here knows the part #
>
> The reason Parts are Unobtainium is Agilent sold the Time and
> Frequency divsion to Symmetricom and while some parts stock is still
> available from Agilent most of the people have moved on plus the 5061
> is a 20+ year old design and it was superceded by the microprocessor
> controlled 5071A which is an even better Cs device which is a couple
> of orders of magnitude better than our 5061x's.    On the other hand
> the 5061 is approachable by someone with a well equipped lab.
>
> But still we own devices which at one time were the exclusive domain
> of Govenments, national laboratories and aerospace firms.
>
> Welcome to the club!
>
> On Thu, Oct 2, 2008 at 11:09 AM, Jeffrey Okamitsu <w3kl at w3kl.com>
wrote:
>> Scott, Tom.  Thanks for your input.  I am sure the unit was working
before
> hand.  I will probably pop the top cover off and have a look.
>>
>> The schematic helps.  Thanks.
>>
>> Yes, this was the one on e-bay.  Was I bidding against you?
>>
>> Jeff
>>
>> Jeffrey K. Okamitsu, PhD, MBA
>> +1-609-638-5402
>>
>> --- On Thu, 10/2/08, Scott McGrath <scmcgrath at gmail.com> wrote:
>>
>> From: Scott McGrath <scmcgrath at gmail.com>
>> Subject: Re: [time-nuts] AC Connector On HP 5061B
>> To: "Tom Van Baak" <tvb at leapsecond.com>,
"Discussion
> of precise time and frequency measurement" <time-nuts at febo.com>
>> Date: Thursday, October 2, 2008, 10:29 AM
>>
>> 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
>>
>>
>
http://www.home.agilent.com/agilent/facet.jspx?cc=US&lc=eng&t=80091.k.3&no=150
>>
>> 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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