Hi Quick and dirty way to check the oven is to monitor current. It should start out near the max rated power and drop back after a few minutes.
Bob > On Nov 30, 2021, at 9:36 AM, Jared Cabot via time-nuts > <[email protected]> wrote: > > Ok, so I carefully dismantled the OCXO and I may have found the culprit... > The screws holding the two transistors to the metal body were both less than > finger tight! > Don't know how that happened, so they were cinched up to 5in-lbs with the > torque screwdriver as per the service manual, and I'll give the thing a test > once it's all back together. > I'll have a dig around to see if I can find a small thermocouple or similar > to see what the oven temperature is at now. > > Also, I noticed that a 2.0uF, 20% film capacitor in there is looking like > it's had a bit of heat-stroke. > It measures 2.119uF, 0.22ohm ESR, with a dissipation of 0.004 @ 40V, @ 1kHz, > so it seems to test ok. > Does this look like it needs to be replaced (picture link below)? I can't > find the same part on Digikey/Mouser, but it seems like Keysight have them as > 'orderable' status. > Details are as follows: P/N: 0160-4947 Part Description: Capacitor-Fixed 2uF > +-20PCT 50V polyester metallized THT > > https://i.imgur.com/aZ0KUD8.jpg > > Thanks! > Jared > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > > On Monday, November 29th, 2021 at 06:30, <[email protected]> wrote: > >> With that offset either the oven set point has changed or there has een a >> > >> component value shift in the oscillator circuit. >> > >> The easiest way to test is to stick in another 10811 if available. >> > >> You could also install one of the original 105 style oscillators if you >> > >> have one. >> > >> Cheers, >> > >> Corby >> > >> time-nuts mailing list -- [email protected] -- To unsubscribe send an >> email to [email protected] >> > >> To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send an > email to [email protected] > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
