[time-nuts] Thunderbolt oven / non-stable operating temperature

WB6BNQ wb6bnq at cox.net
Mon Dec 10 23:47:41 UTC 2012


That temperature sensor does have an effect on the final outcome as it is part of
the internal equation.  So buffering the ambient temperature is important.

You do not need to go crazy, but having it contained in a box with some small amount
of heat applied and maintained by some controlling mechanism would be a good way to
go.  The amount of heat depends upon what extremes your location experiences over
the day/week/year and the effective insulation of the container.  Ideally you would
want no temperature change, but, obviously, that is not practical, so a one degree
variance would be a reasonable goal.


Sarah White wrote:

> On 12/10/2012 6:10 PM, Arthur Dent wrote:
> > I believe that the high temperature alarm you see is triggered at 50 degrees
> > C.  If that is what you're seeing without artificially raising the temperature
> > of the Thunderbolt by insulating it so it can't radiate the heat, what I said
> > about replacing the chip is correct but if it is staying within a few degrees
> > over the course of  the day and is in the 40 degree C range without being
> > insulated, the DS1620 thermometer chip is o.k..
> My particular thunderbolt seems to be from 2004, so I guess that manual
> is at or around checked:
> ThunderBolt[tm] GPS Disciplined Clock User Guide Version 5.0
> 5.0 is a version of the manual published in 2003
> Table C.2.2 Environmental Specifications:
> Operating Temp: -0°C to +60°C
> Storage Temp: -40°C to +85°C
> ... so I guess I shouldn't worry about a few degrees of difference in
> the reported temp, especially considering that the sensor in question
> isn't on the OCXO itself.
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