[time-nuts] Cesium tube ion pumps

aceamusements at mchsi.com aceamusements at mchsi.com
Wed Dec 3 23:27:45 UTC 2008


Corby,

AT what point would be approp to call symmetricom and complain about defective
tube?I still have 2 years on the 5 yr warranty left, but how do u explain this
(defect),,(I assume it will just keep rising and eventually ruin the tube within
a few yrs?)last I checked they wanted about 28k for a new tube.

the unit with high perf tube has 5 yr warr from date of manuf. and cost 59k new.


----------------------  Original Message:  ---------------------
From:    Corby Dawson <cdelect at juno.com>
To:      time-nuts at febo.com
Subject: [time-nuts] Cesium tube ion pumps
Date:    Wed, 3 Dec 2008 22:11:16 +0000

> David,
> 
> The long storage is not the cause. Extended operation of the ion pump
> causes the "whiskers" to grow. They can give rise to field emission
> leakage currents.
> 
> This manifests as a raised ion pump current but does not inhibit proper
> operation unless the current gets too high.
> 
> I don't remember at what current a 5071A will shut down at but I can take
> a look in the manual.
> 
> Corby
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