[time-nuts] Trimble Tbolt temperature

[Christophe Huygens]

Thanks all - if of no consequence, case closed.

On 04/12/19 03:03, Tom Van Baak wrote:
> 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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>
>
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