[time-nuts] PRS-45 Cs Standard

Bob Camp kb8tq at n1k.org
Fri Dec 5 21:14:24 EST 2014


Hi

What counts is running hours. There is no way to know how many running hours the gizmo has just from looking at the manufacturing date. It could have been constant service the whole time. It might have just sat on a spares shelf. Another pretty good bet is that it was a sales demo unit that saw intermittent use over the time period. If there are no (obvious) asset tags or company property stickers on it, the sales demo bumps up the list a bit. 

Bob

> On Dec 5, 2014, at 8:37 PM, Bob Stewart <bob at evoria.net> wrote:
> 
> Hi Magnus,
> I'll certainly do that, but I'm waiting to pull the panels until I know that it works.  I don't want a finger pointing at me saying I broke it.  The reason I posed the question was that I'm wondering if this thing, at 11 1/2 years old, is on it's last dying legs.  But, I suppose I won't find that out until it's powered up and I can download the status string.  What will I be looking for?  I think I've read something about ion pump current from past posts about rehabilitating an old Cs standard.  I'll have to go back through that thread.
> 
> Bob
> 
>      From: Magnus Danielson <magnus at rubidium.dyndns.org>
> To: time-nuts at febo.com 
> Cc: magnus at rubidium.se 
> Sent: Friday, December 5, 2014 6:10 PM
> Subject: Re: [time-nuts] PRS-45 Cs Standard
> 
> Bob,
> 
> Do open up and take a look. Do take photos. Do share. :)
> 
> Bet the bottom plate is a good start.
> 
> Cheers,
> Magnus
> 
> On 12/05/2014 10:31 PM, Bob Stewart wrote:
>> Hi Magnus,
>> It came in today.  Looks good from the outside.  No obviously bad smells, but I can't power it up, as my PSU hasn't come in yet.
>> 
>> There is a paper Datum tag dated 6/2/03 on the outside.  Looking through the vent holes, I can see a Datum Cesium Beam Tube assembly Model Number 7613A/077, Part Number 74514-110.  I can see that the back two panels have been removed and replaced, but nothing obvious has been done on the inside.  There are two SMB connectors on the main board that don't have anything plugged in, but there's nothing obvious that they'd connect to.  Does any of that tell me something that I don't want to know?  It's going to be a long wait till Monday.  =)
>> 
>> Bob
>> 
>>         From: Magnus Danielson <magnus at rubidium.dyndns.org>
>>   To: time-nuts at febo.com
>> Cc: magnus at rubidium.se
>>   Sent: Wednesday, December 3, 2014 1:38 PM
>>   Subject: Re: [time-nuts] PRS-45 Cs Standard
>> 
>> Hi Bob,
>> 
>> The manual is in your inbox.
>> It also describes a DS1 interface, which should be interesting to know
>> what the odd telecom signals is about. :)
>> 
>> Cheers,
>> Magnus
>> 
>> 
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