keep the heat sensing very close to the heating to avoid thermal control
oscillation ! a thermal time constant is large and no to easy to deal
with it
73
Alex
On 7/3/2014 6:35 PM, Angus wrote:
Hi Bert,
I am thinking about testing a heat pipe on a fan cooled setup I use.
The first temp controlled chassis I did used a peltier and works very
well, but was a lot more work to do and is much more power hungry.
The main problem I find is not the temp controller itself, but rather
the change in the temperature across the chassis as the ambient
changes. However good the temp controller is, it only controls a
single point, but other points further away from the sensing
thermistor can vary a lot.
I noticed you posted a picture of a heat pipe cooler a couple of weeks
ago - did you happen to compare the temperature across the unit with
direct fan cooling and the heat pipe cooler, or with different heat
pipes?
Angus.
On Sat, 28 Jun 2014 12:37:37 -0400 (EDT), you wrote:
Will someone beside us use heat pipe. Would love to have an impendent
input. What does it take to get a test going. Scott has done a lot of work, how
about some one else step up to the plate. There are a lot of time nuts out
there with the 5680A,many for the first time will have a very good
reference and some of our experts with proper equipment can make a big
difference.
Bert Kehren
In a message dated 6/28/2014 12:20:12 P.M. Eastern Daylight Time,
newell+timen...@n5tnl.com writes:
At 04:32 AM 6/28/2014, wb6bnq wrote:
monitoring process ? In other words have you traced out the
connections to see what is driving the pin you think is the temperature
input ?
No. I've only traced back from the ADC input to the voltage divider.
The next big question is have you monitored the frequency and its
stability, externally, to observe what effects are taking place when
you disable this input to the A/D ?
I have not.
That sounds complicated and messy but may be easier than it
appears. An appropriate container would be:
It does sound messy. I don't think I'm willing to dunk one of my units.
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