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
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
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