Bob wrote:
The strange temperature chip in the later TBolts isn't much of an
issue. The chip is poorly located for temperature control. It only
seems to impact the plots on Lady Heather. Trimble wasn't bothered
enough by it to patch the firmware.
My experience is consistent with this.
Michael wrote:
I'm still not entirely sure this is a good idea though, seems like a
low-temp oven for the whole tbolt would be better if you want
thermal stability.
Precisely because it is not clear that holding the backplate of a
Tbolt at a constant temperature is the best way to keep the
I had a thunderbolt that displayed a temperature reading of -54.99°C, which
I was pretty sure wasn't correct. ;-) Apparently the reference in the DS1620
chip either shorted or opened so this D revision chip was outputting its
lowest possible reading. I replaced it with a C revision chip that
I have a Tbolt (labeled Rev. E, 5/31/05) that seems to be working
properly, except for the
temperature display in Lady Heather. When I start the program the
display will come up
typically showing the temperature as a straight line at 39.749981C
and DAC voltage is -0.073xxx.
The temperature
Hello Maury,
A Lady Heather screen grab would be helpful in understanding the issue.
How is the power supply doing ?
I once had a flakey power supply that gave me abnormal readings.
Stan, W1LE Cape Cod
msproul wrote:
I have a Tbolt (labeled Rev. E, 5/31/05) that seems to be working
It sounds like you have a Tbolt with the newer rev E (or greater) temp sensor
chip... which is not totally compatible with the tbolt firmware. Dallas
Semiconductor changed the DS1620 chip design and made it so the Tbolt cannot do
high resolution temperature readings.
It sounds like you have a Tbolt with the newer rev E (or greater) temp
sensor chip... which is not totally compatible with the tbolt firmware.
Dallas Semiconductor changed the DS1620 chip design and made it so the Tbolt
cannot do high resolution temperature readings.
Hi,
I've been lurking on this list for a long time but now it's time to unlurk.
I don't remember if it's appropriate to introduce oneself on this
list, but I'll do it anyways. :)
I've been tinkering with electronics for some thirty odd years now -
mostly just as a hobby but also occasionally
@febo.com
Subject: [time-nuts] Thunderbolt temperature measuring
Hi,
I've been lurking on this list for a long time but now it's time to unlurk.
I don't remember if it's appropriate to introduce oneself on this list, but
I'll do it anyways. :)
I've been tinkering with electronics for some thirty odd
Engstrom
Sent: 26 July 2009 19:14
To: time-nuts@febo.com
Subject: [time-nuts] Thunderbolt temperature measuring
Hi,
I've been lurking on this list for a long time but now it's time to unlurk.
I don't remember if it's appropriate to introduce oneself on this list, but
I'll do it anyways. :)
I've
Mat,
I think the purpose of the DS1620 is to integrate the ambient temperature into
the equation used by the T-bolt. I suspect that the ovenized internal
oscillator
has its own temperature control. That being the case, then it would be
counterproductive to couple the DS1620 to the oscillators
Hi Mats,
welcome!
As you are working already with a wired interface, I think
you don't risk anything when trying it - you can not really lose anything,
I think you may have a problem to see a difference because
the missing reference.measurements. I do not expect a EMC problem,
but it's as
From my poking and prodding, I think the temperature sensor serves two
purposes. First as an environmental alarm. Second as compensation for
temperature effects on the system as a whole. As such, you want it near
where it was. Sticking it on the oscillator would mask a lot of the ambient
configuration.
Didier
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Mark Sims
Sent: Sunday, July 26, 2009 5:37 PM
To: time-nuts@febo.com
Subject: [time-nuts] Thunderbolt temperature measuring
From my poking and prodding, I think
I have one of the Trimble Z3801 look-alikes. It only seems to report
its temperature in half-degree steps, but I left it running for
nearly 27 hours, and saw a couple of 1-second 1 degree spikes during
that time - see attached graph. Could this be the same thing you are
seeing with your real
I set up my ThunderBolt data logger to flag temperature spikes. Over a 10 hour
run last night it caught five of them (TOW magnitude):
104416 0.097 deg
104898 0.022 deg
115715 0.087 deg
135298 0.098 deg
138564 0.041 deg
Mark Sims wrote:
I set up my ThunderBolt data logger to flag temperature spikes. Over a 10
hour run last night it caught five of them (TOW magnitude):
104416 0.097 deg
104898 0.022 deg
115715 0.087 deg
135298 0.098 deg
138564 0.041 deg
Yes indeed, those are spikes... and rather big ones at that. They may seem
small, but they occur over a one second period. Normally I do not see more
than 1 millidegree of change over that time interval. These spikes are 20 to
100 times that. After the spike, the temperature reading
On Mon, Jul 14, 2008 at 9:44 AM, Dan Rae [EMAIL PROTECTED] wrote:
This is a spike? Surely this kind of tiny temperature variation on
the unit's board somewhere outside the oven does not have a lot of
relevance or effect on anything inside the oven where it is all
happening. And what is the
Looking back through some old logs with my New and Improved Spike Finder (tm),
it appears that spikes seem to occur, on average, around every 2-3 hours and
their effect shows up in the data for around 20 seconds... so figure on 1 part
in 500 of the temperature data is corrupted by their
My own gut feeling is that it is a glitch making its way through one of the
power supplies. Its decay looks like it could be capacitive... Pr thermal.
or (fill in the blank)
I'm using the brick power supply povided and it is possible that they generate
transients, or poorly react to normal
I have both a red-box unit with the single input power supply (internally it
has a ATT DC-DC converter brick and lots of filtering stuff) and two of the
three-supply units. All of them show the same temperature glitches. I have
had one running off of a Tektronix PS-503A linear lab supply and
Looking back through some old logs with my New and Improved Spike
Finder (tm), it appears that spikes seem to occur, on average, around
every 2-3 hours and their effect shows up in the data for around 20
seconds... so figure on 1 part in 500 of the temperature data is
corrupted by their
The nature of the spikes are that they show an instantaneous impulse 100mV rise
in the temperature readings between two 1 second samples. The rise exists for
one sample then decays over around 20 seconds. There is no way that any CPU
(or bus) activity can generate a heat pulse that would
From: Mark Sims [EMAIL PROTECTED]
Subject: Re: [time-nuts] Thunderbolt - temperature
Date: Fri, 11 Jul 2008 21:23:20 +
Message-ID: [EMAIL PROTECTED]
The temperature is the electronics temperature. When I put the cover on my
red-boxed unit, the temperature went up about 8 C. This would
Magnus Danielson wrote:
The temperature is the electronics temperature. When I put the cover on my
red-boxed unit, the temperature went up about 8 C. This would not have
happened if them temp was inside the thermostatically controlled oven.
The temperature in the oven would also
I suspect that the fluctuation is some sort of noise or software glitch (but
one of my systems is powered by a very nice linear supply so probably not power
related).
What is strange is the decay. If it was a noise glitch, one would expect it
to last one sample. But, it decays back to the
I too am seeing them - four or five events during a 24 hour time period. Below
are 50 temp readings before and after an event.
32.82
32.82
32.82
32.82
32.82
32.82
32.82
32.82
32.82
32.83
32.92
32.91
32.90
32.89
32.89
32.88
32.87
32.87
32.87
32.86
32.86
32.85
32.85
32.85
32.85
32.84
32.84
32.84
Hello,
I have a question regarding the temperature reading in the Thunderbolt Monitor
program of the Trimble Thunderbolt GPSDO. Is this the temperature of the board
or the temperature of the crystal?
Related to this: does it help to put the Thunderbolt in an isolated box or is
this an
The temperature is the electronics temperature. When I put the cover on my
red-boxed unit, the temperature went up about 8 C. This would not have
happened if them temp was inside the thermostatically controlled oven.
, so minimizing the ambient variations has
got to be a good thing.
Didier KO4BB
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Patrick Reynaert
Sent: Friday, July 11, 2008 1:22 PM
To: time-nuts@febo.com
Subject: [time-nuts] Thunderbolt - temperature
My Thunerbolt is sitting on the floor. It is covered by an upside down
cardboard box. This added mayby 1 C to the temperature reading. It hovers
around 40C (when my unit in the red metal box was open, it was around 32C).
My temperature plot typically shows a sine wave shape with around
At 03:37 PM 7/11/2008, Didier Juges wrote:
On the other hand, I think it would be very well advised to place the unit
in a quiet area with minimal temperature changes, like you would do to keep
a good bottle of wine.
I knew that putting my Z8301 in the wine locker in the garage was a
good idea.
A strange anomaly shows up occasionally in the temperature plot. You
occasionally see a 100 millidegree instantaneous positive spike in the
data. The temperature then decays over 30 seconds back to the
original curve. This occurs on all of my units. They are all
different revisions with
In a message dated 12/07/2008 00:14:13 GMT Daylight Time, [EMAIL PROTECTED]
writes:
when my unit in the red metal box was open, it was around 32C
--
I'm intrigued by this and similar earlier references.
I've only seen Thunderbolts in gold coloured aluminium boxes, where did
You can see a picture of the red box unit in the Thunderbolt data sheet:
http://trl.trimble.com/docushare/dsweb/Get/Document-10015/
I got mine off of Ebay. It has a builit in telecom style power supply that
takes from 32-72 volts. It came with a input power cable that ored two input
supplies
In a message dated 12/07/2008 01:01:27 GMT Daylight Time, [EMAIL PROTECTED]
writes:
You can see a picture of the red box unit in the Thunderbolt data sheet:
_http://trl.trimble.com/docushare/dsweb/Get/Document-10015/_
(http://trl.trimble.com/docushare/dsweb/Get/Document-10015/)
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