Hi Lon, hello to all members.
In 1995 the art of temperature control was a good bit more advanced,
and a bi-metal thermostat would not be stable enough These ovens have a
semiconductor temperature control; so I would suspect a shorted
transistor.
These failures in OCXO are not that rare, and that is why there are
thermal safety fuses. And please don't defeat them !
73 from Claude VA2 HDD
Le 02/06/2022 13:55, K5jv via time-nuts a écrit :
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I was recently evolved in a discussion about the HP 58503 option 001
display. The general idea is that there is some command to tune the
display on or off. A few ideas were offered but no one had anything
except "they heard about it." I have found nothing on the subject
from old HP literature. Comments would be appreciated. I am not
talking about turning the power off to the DC/DC converter.
On a different subject: A couple of month back I got some strong
criticism about suggesting that the oven in the Z3801A was a potential
source of problems. I just got another Z3801A in for repair. Same
symptoms as before; appears to turn on normally but after a while
goes into holdover and stay there, same LH flat lines. Once again
the problem turned out to be the oven. It was unusually hot to the
touch. Changing the oven solved the problem. Now my question. I
have never opened one of these oven, so have no real idea exactly what
is inside. I would suspect that one of the oven's thermostats is
stuck in the "on" position. Since it is a "double oven", there could
be two thermostats? If these are mechanical contacts, as one might
expect fro the 1995 era, can they be cleaned or replaced? Comments
from anyone who has actually seen inside one of these ovens would be
appreciated.
73 de Lon, K5JV
281-795-1335
[a96323c7-47c0-46b2-8018-f039618476d5]
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