Chris,
Thanks for the reply. I have made just such a mod to one of my 58503's.
It was in a discussion of this
mod that the idea arose that HP had built in such a command. But, no one
had actual knowledge of such
this hidden command. It was most probably just wishful thinking. Thanks
again
I'm not aware of any command to turn off the display - I haven't seen it in
the manual, but I think that it might use the same display interface as the
53131A counter. For that unit I've added a two pole switch that allows me
to turn off the anode and filament voltages to the display when I'm not
Am 2022-06-02 19:55, schrieb K5jv via time-nuts:
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
Lon, K5JV said:
> Comments from anyone who has actually seen inside one of these ovens would be
> appreciated.
http://www.realhamradio.com/GPS-oven-journey.htm
--
For lots of info on the Z3801A start here:
http://www.realhamradio.com/GPS_Frequency_Standard.htm
(Time sink warning.)
--
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,
Hi
Both control loops in the 3801 OCXO’s are thermistor based. If the outside loop
goes nuts, the device might survive. If the inside loop shorts out, the normal
result is a melt down of the OCXO innards.
Bob
> On Jun 2, 2022, at 9:55 AM, K5jv via time-nuts
> wrote:
>
> I was recently
