Hi, I'm unable to fully grasp the lifetime specifications of typical
COTS cesium standard physics packages, for both old and new designs.
For example, the documentation of an older HP standard specifies a shelf
life of two years if the ion pump is operated two or three times per
year, yet at th
Hi
The real questions are:
1) Over what period of time can you get a replacement under warranty.
2) How long on average is the tube likely to be useful.
There are numbers for each. It just depends on which one you are after.
Bob
> On Sep 29, 2016, at 8:07 AM, Ruslan Nabioullin wrote:
>
> H
On 09/29/2016 01:03 PM, Bob Camp wrote:
2) How long on average is the tube likely to be useful.
So you are implying that the package life is depleted at a roughly equal
rate regardless of whether the package is fully operating, has just the
pump operating, or is completely shut off?
-Ruslan
It depends on the beam tube There is a fixed amount of Cs in any given beam
tube this pool of Cs is consumed during operation.Once the Cs is depleted
the tube will no longer function.It's possible with intermittent use for
the tube to run for decades as long as vacuum maintenance is pe
I think there are two separate issues to consider:
1. Cesium depletion, which only occurs when the tube is operating with
cesium oven on, and high voltage at the other end; and
2. Tube vacuum and other physical aspects that may deteriorate over
time, whether or not the tube is operating. T
Ruslan,
Yes you can conserve tube life my operating in the Cs off mode (for 5061A
and B).
This mode still powers the ion pump and helps maintain the vacuum.
If the tube is exposed to high temperatures for a long period the Cesium
will slowly escape the oven assy. and reduce the life of the tube.
A
On 09/29/2016 01:50 PM, John Ackermann N8UR wrote:
2. Tube vacuum and other physical aspects that may deteriorate over
time, whether or not the tube is operating. The routine ion pumping
helps keep the vacuum up in storage, but is not as effective as the
continuous pumping that occurs during op
Hi
Are you interested in improving the likelihood of the unit working 30 years out
or of it
working 15 years out? The “operating” case will ultimately kill various parts
in the standard
that would not die sitting on the shelf. The pumping process *may* extend the
life of the tube…..
What the p
Hi
> On Sep 29, 2016, at 1:16 PM, Ruslan Nabioullin wrote:
>
> On 09/29/2016 01:03 PM, Bob Camp wrote:
>> 2) How long on average is the tube likely to be useful.
>
> So you are implying that the package life is depleted at a roughly equal rate
> regardless of whether the package is fully opera
On 09/29/2016 02:02 PM, Bob Camp wrote:
The “operating” case will ultimately kill various parts in the
standard that would not die sitting on the shelf.
Oh, really? I thought that cesium depletion is essentially the only
real killer.
-Ruslan
___
t
On 09/29/2016 11:45 AM, Scott McGrath wrote:
It depends on the beam tube There is a fixed amount of Cs in any
given beam tube this pool of Cs is consumed during operation.Once
the Cs is depleted the tube will no longer function.It's possible
with intermittent use for the tube to run for
Hi
If you operate the device continuously for 30 years, you *will* have other
parts in
it fail. The MTBF of the system (without the tube) is *not* infinite.
Bob
> On Sep 29, 2016, at 2:08 PM, Ruslan Nabioullin wrote:
>
> On 09/29/2016 02:02 PM, Bob Camp wrote:
>> The “operating” case will ul
The tubes were never intended to last 10 and more years. Bad for business.
The reality as time-nuts have discovered is that they do. What you have in
this group is an amazing knowledge of how to keep them ticking. Pun
intended.
The comment of raising the oven temp is exactly how I was able to get m
> 1. Cesium depletion, which only occurs when the tube is operating with
> cesium oven on, and high voltage at the other end; and
The Cs atoms need to be electrically neutral, so their depletion rate shouldn't
depend on the presence of HV, just the oven heater. State selection wouldn't
work on
Hi John,
I have a Datum FTS-5060 unit. Did you just open up the heater line to the
beam tube? I like the idea of conserving the Cs when pumping down the tube
for maintenance.
Regards,
Tom
- Original Message -
From: "John Miles"
To: "'Discussion of precise time and frequency measu
If I remember correctly, the oven power supply runs off of the same bus that
powers the rest of the unit, in the 5062C's case. It took a fair bit of
hacking to install the switch and make it do what I wanted. Not much besides
the ion pump and the OCXO remains active with the switch in the 'of
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