Hi guys,
I am going to pull it apart this weekend and do some more exploring. Hope to
get some pictures for reference.
I think I will make up some extender cables so I can operate the CBT
assembly away from the main chassis. That should make things a bit easier to
look at.
Thanks,
Tom
----- Original Message -----
From: "J. L. Trantham" <[email protected]>
To: "'Discussion of precise time and frequency measurement'"
<[email protected]>
Sent: Wednesday, October 02, 2013 10:07 AM
Subject: Re: [time-nuts] FTS 4060 Cesium Time & Frequency Standard, Datum
Tom,
I defer to Bert on these issues. He is the one that shepherded me through
the learning curve about the HP units.
I have a couple of HP 5061A's with FTS tubes and I agree with Bert that they
seem to 'work better' than the HP tubes. However, I would think that the
ion pump current would at least 'move the meter' when the unit is turned on
for the first time after a week or two off. If it failed to move the meter
at all, I would be suspicious of a dead HV supply or a shorted tube. I know
first-hand that the HP tubes can be shorted but I don't know whether that
has been seen with FTS tubes.
Do you have any pictures of the interior of the unit? Is there a manual to
be had?
Joe
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of [email protected]
Sent: Wednesday, October 02, 2013 8:20 AM
To: [email protected]
Subject: Re: [time-nuts] FTS 4060 Cesium Time & Frequency Standard, Datum
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,
[email protected] 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 <[email protected]> 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 <[email protected]> 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"
<[email protected]>
> To: "Discussion of precise time and frequency measurement" <
[email protected]>
> 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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