[time-nuts] Trimble Tbolt temperature

[Tom Van Baak]

Most TBolt measure board temperature to about 1/100th C resolution. This 
is the correct behavior. Some TBolt report temperatures that seem to 
step in 1 C increments, or they report a constant -55 C, or they glitch 
once in a while. These are bugs.

You can replace the DS1620 chip if you want. It's perhaps best to locate 
the 20-year old version of the chip. There are lots of threads about 
this in the archive.

The DS1620, working or not, has no effect on the performance of a 
running TBolt. So I've never bothered replacing any of mine. It may have 
a slight effect on extended holdover performance. It's a long story and 
I'm not sure if anyone has actually verified or quantified this.

Here's additional info about the TBolt & DS1620; it's more complex than 
you think:

"Strange temperature peak"
https://lists.febo.com/pipermail/time-nuts_lists.febo.com/2011-May/039188.html 


"Trimble Thunderbolt GPSDO Temperature Sensor Details"
http://leapsecond.com/pages/tbolt-1620/

"Dallas state machine glitch"
https://www.digitemp.com/docs/ds1820-report.pdf

/tvb


On 12/3/2019 1:47 AM, Christophe Huygens wrote:
> Hi all,
>
> I am back on time-nuts after many moons.
>
> Lady heather shows constant -55deg C for my Tbolt.
>
> all else seems to function fine (is in a constant T environment, sort of)
>
> Any thoughts....
>
> br and thanks
>
> Xtof
>
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