[time-nuts] Trimble Tbolt temperature

[Taka Kamiya]

I have two Nortel version of Tbolt.  I see 1/100c increment in one and 1c increment in the other.  I also have PRS-10 that shows millions of degrees every now and then.  In neither case, nothing else other than display seem to be affected.  I have no inferno in lab.  I mentioned this to LH author.  I was informed LH will display the data given and not edit that in any way.  I can sort of agree with this, as if it filtered out what seem to be impossible numbers, real glitch will also not be seen.  (but million degrees gives whole new meaning to atomic time keeping....???)

--------------------------------------- 
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
 

    On Tuesday, December 3, 2019, 9:44:22 PM EST, Tom Van Baak <tvb at leapsecond.com> 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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