[time-nuts] HP 5065A rubidium lifetime

paul swed paulswedb at gmail.com
Sat Mar 20 00:14:22 UTC 2010


Corby,
Interesting on the melt down. Is there a reason to consider a second safety
device somehow?
I would hate to loose the 5065 because of a run away heater.


On Fri, Mar 19, 2010 at 5:10 PM, Corby Dawson <cdelect at juno.com> wrote:

> I have been repairing HP 5065A for over 20 years and have never had a
> failure due to "darkening"
>
> I did have one Efratom unit years ago that the lamp envelope had darkened
> so much it was unusable.
>
> Not sure if the is the "darkening" referred to?
>
> The "killer" 5065A failures are oven failures that melt the insides, and
> a bulb that has a very low output. (The bulb envelope is still nice and
> clear in these cases.)
>
> The bulb can be replaced with some Efratom ones with varying results.
>
> Also cell flooding can occur after long storage and/or storage in high
> temperatures.
>
> This is easily cured by applying 5VDC thru a 5ohm 10watt resistor to the
> TED (thermoelectric device) in the receiver for 6 days or so.
>
> Corby Dawson
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