[time-nuts] PRS-45 Cs Standard

[EWKehren at aol.com]

Provided the unit works one simple way to get an idea as to the health of  
the tube is  to insert a plain multi meter in the 200 mV position. That  
inserts a 10 M resistor in series and you can calculate beam current.
Bert Kehren
 
 
In a message dated 12/5/2014 8:38:07 P.M. Eastern Standard Time,  
bob at evoria.net writes:

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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