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
<[email protected]> 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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