[time-nuts] Thunderbolt oven / non-stable operating temperature
golgarfrincham at yahoo.com
Mon Dec 10 22:41:37 UTC 2012
>I feel like shouldn't need to fuss with ambient conditions this heavily
>for an OCXO, and find myself researching construction / design for a DIY
>outer-oven to wrap the thunderbolt in.
>Anyone have experience with non-stable temperature on a trimble thunderbolt?"
The temperature you see is not from the OCXO but from the thermometer chip
near the RS-232 connector. The DS1620 is probably at fault and the rest of the
Thunderbolt is operating as it should. I've see a lot of Thunderbolts and the most
common failure mode of the non E revision DS1620 thermometer is for them to
display -55 degrees C although it could just have erratic output like yours. The
erratic temperature that it is reporting could cause the processor to try to
compensate for the erratic jumps and cause the Thunderbolt output to be less
stable. The DS1620 should be replaced.
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