In message <20190712203821.5ddb6406...@ip-64-139-1-69.sjc.megapath.net>, Hal Mu
rray writes:
>Shipping a TEC cooler could get interesting. You need to get rid of the heat
>somehow. Cooling fins on a package would be interesting.
They have ways of dealing with freight like that
Hi
Ok, if it’s a “heat only” design, how about a dewar flask? They aren’t the most
rugged items
out there so some sort of padded enclosure would be needed. The real question
is:
Does a “single end” design impact your ability to use the resistor? Put another
way - do you need
to hit both ends
On Fri, 12 Jul 2019 at 22:02, Hal Murray wrote:
>
> drkir...@kirkbymicrowave.co.uk said:
> > If it could run from a few NiMH cells for 48 hours, that would give the
> > option of shipping it. I don't know if that's going over the top, but it
> > would be an interesting exercise.
>
> Shipping a
Hi
The “thermoelectrc chamber” in that paper *is* the gizmo. There is / was a
better paper
diving into the unit in a bit more detail. Even that did not get down to issues
like the controller,
the driver, or the power consumption. Indeed one wonders if there is a giant
heatsink and fan
on the
Figure 5 in http://www.wenzel.com/wp-content/uploads/Sub-pico-Multiplier.pdf
??
Bruce
> On 13 July 2019 at 05:23 Bob kb8tq wrote:
>
>
> Hi
>
> If you do go the TEC route, plan on a fairly big power source :). There is a
> Wenzel doc on doing a TEC based enclosure using a couple of die cast
>
Hi
Airlines tend to have issues with various battery types as well. Not clear
what the rules are on “powered up in the hold” are. My guess is that ground
transportation gets the nod pretty quickly.
TEC’s are good for some limited temperature delta and then you need to go to
cascaded “layers”
And if you are not in a well air conditioned room
Gilles.
Envoyé de mon iPad
> Le 12 juil. 2019 à 18:12, Javier Herrero a écrit :
>
> Hello,
>
> A TEC is good if you want to maintain the resistors at 25ºC, that seems the
> zero TC point for some precision low TCR resistors (for example,
drkir...@kirkbymicrowave.co.uk said:
>> If you do go the TEC route, plan on a fairly big power source :).
> I'm particularly keen to avoid the requirement for high power, as I was
> thinking to make this in such a way it can be shipped and powered up all the
> time. If it could run from a few
On Fri, 12 Jul 2019 at 20:02, Bob kb8tq wrote:
> Hi
> If you do go the TEC route, plan on a fairly big power source :). There is
> a
> Wenzel doc on doing a TEC based enclosure using a couple of die cast
> boxes. The pictures don’t show what they used to drive the beast so part
> of
> it would
Hi
If you do go the TEC route, plan on a fairly big power source :). There is a
Wenzel doc on doing a TEC based enclosure using a couple of die cast
boxes. The pictures don’t show what they used to drive the beast so part of
it would still be up to you. My search skills and their web site are
Hello,
A TEC is good if you want to maintain the resistors at 25ºC, that seems
the zero TC point for some precision low TCR resistors (for example, the
Vishay VFCP or VSMP series)
Regards,
Javier
On 12/7/19 10:06, Dr. David Kirkby wrote:
On Fri, 12 Jul 2019 at 08:07, Bernd Neubig wrote:
In message
, "Dr. David Kirkby" writes:
>I partially read the paper mentioned. I note that the authors used a thermo
>electric cooler (TEC) as they wanted get low temperatures.
Cooling GigaOhm resistors makes sense, Johnson/Nyquist noise is
proportional to the product of absolute
Dave wrote:
>I have recently assembled some reasonably low temperature coefficient (5
ppm/deg C) resistors in a reasonably well insulated box to try to make a
resistor that should be stable over short time periods to allow it to be
used as a transfer standard. But I am seriously >considering
On Fri, 12 Jul 2019 at 06:03, Perry Sandeen via time-nuts <
time-nuts@lists.febo.com> wrote:
> Yo Bubba Dudes!,
> This may not be too germain to the present discussion of temperature
> controllers but if anyone is interested I have a PDF copy of:
> A versatile thermoelectric temperature
Thanks Perry for that offer. I think the PDF is available several places
on the web, including the author's own website:
https://www.its.caltech.edu/~atomic/publist/tempcontroller.pdf
In addition there's a "comment on" the paper here:
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