[time-nuts] FTS 4060 Cesium Time & Frequency Standard, Datum

[EWKehren at aol.com]

Your observations are tru for HP tubes but not FTS. I see FTS tubes after 2 
 years pump down in 20 minutes.
Bert Kehren
 
 
In a message dated 10/2/2013 9:17:07 A.M. Eastern Daylight Time,  
paulswedb at gmail.com writes:

Boy is  this good advice thats why I turn Frankenstein 9$125 flea market
special)on  every quarter check that it works etc. The ion pump being 0 is
the place to  start looking as Joe says 0 is very very hard to believe in
the types of C  units we get. Usually they have gas and the needle pegs or
is quite high  stopping the unit from starting.
So do basic troubleshooting first. All  voltages RF....
Many of us here have experience with the HPs so the FTS may  not have the
places to take a look and see whats going on that  the  HPs have.
Regards
Paul


On Wed, Oct 2, 2013 at 7:28 AM, Bob  Camp <lists at rtty.us> wrote:

> Hi
>
> Welcome to  the reason a lot of us don't have running Cs standards.
>
> There  is a very basic wear out mechanism with Cs. Once it's moved from 
one
>  end of the tube to the other, the tube is dead. There is no practical  
way
> to rebuild the tubes. Running one will simply wear out the tube.  They 
are a
> very expensive toy to keep working.
>
>  Bob
>
> On Oct 1, 2013, at 9:53 PM, Tom Miller  <tmiller at skylinenet.net> wrote:
>
> > Update.
>  >
> > I received the FTS 4060 unit and guess what - it does not  work.
> >
> > So a few questions to the experts on this  list-
> >
> > 1)  How can I verify that the CBT is in  fact bad? Is there any easy way
> to confirm the high voltage supplies  are working short of pulling the CBT
> assembly out and making direct HV  measurements? How about the other tube
> functions? There is no beam  activity on meter 3 and the ion pump voltage 
is
> 0.
>  >
> > 2)  If it is a bad tube (likely), is there any way it  can be rebuilt?
> Does anyone do such a thing?
> >
> >  3)  Is there any source for used tubes?
> >
> >  4)  If this is a dead end, is there any value in the rest of the  unit?
> This one has the display clock and the 5 MHz and 100 kHz  options.
> >
> > Or should I just bury it in the back yard  and lick my wounds?
> >
> >
> > Regards,
>  > Tom
> >
> >
> > ----- Original Message -----  From: "Tom Miller" 
<tmiller at skylinenet.net>
> > To: "Discussion  of precise time and frequency measurement" <
>  time-nuts at febo.com>
> > Sent: Tuesday, September 24, 2013 7:10  PM
> > Subject: [time-nuts] FTS 4060 Cesium Time & Frequency  Standard, Datum
> >
> >
> > While we are on Cs  standards, is there technical information (service
> > manual)  available for the Datum FTS 4060 Cesium Time & Frequency 
Standard
>  > and its options?
> >
> > Thank you,
> >  Tom
> >
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