I sent him the manual so that the serial readout of that digital cesium becomes easy and trivial.

Cheers,
Magnus

On 12/06/2014 10:56 AM, Bert Kehren via time-nuts wrote:
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,
b...@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  <mag...@rubidium.dyndns.org>
To: time-nuts@febo.com
Cc:  mag...@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 <mag...@rubidium.dyndns.org>
  To:  time-nuts@febo.com
Cc: mag...@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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