[sdiy] temperature testing

[matt holland]

Sorry, I neglected to mention the important step of opening the fridge door
;)

On Thu, May 11, 2017 at 11:25 AM, Dave Magnuson <abide at dmdrafting.com>
wrote:

> Hi Matt,
>
>
>
> I bet unplugging a refrigerator would probably work in theory.   But I
> don’t think the problem will be too fast of a temp change; it should be
> insulated well enough that it might occur fairly slowly … perhaps annoying
> so ;)
>
>
>
> Dave
>
>
>
> *From:* Synth-diy [mailto:synth-diy-bounces at synth-diy.org] *On Behalf Of *matt
> holland
> *Sent:* Thursday, May 11, 2017 2:05 PM
> *To:* Neil Johnson
> *Cc:* *SYNTH DIY
> *Subject:* Re: [sdiy] temperature testing
>
>
>
> Perfect, thanks Neil. I guess "Incubator" is the magic search term.
> definitely hobby budget! Hopefully I can find an equivalent in the states.
> So I'm guessing your process with the incubator is manually stepping up the
> temperature with a stabilizing period in between, with the thermocouple for
> the accurate temperature readout? Is the superglue for the thermocouple?
>
>
>
> I like the fridge idea for single point measurement. What would be the
> downside to say, unplugging the fridge and taking measurements while it
> warms up to ambient? Temp changing too fast to be sure the data is accurate?
>
>
>
> Multiple thermocouples... to be certain you aren't being misled by
> hotspots on the PCB?
>
>
>
> thx,
>
> mh
>
>
>
>
>
>
>
>
>
> On Thu, May 11, 2017 at 2:13 AM, Neil Johnson <neil.johnson71 at gmail.com>
> wrote:
>
> Hi Matt,
>
> > searched a bit through the archives and didn't find anything so... how do
> > you all go about testing your circuits over temperature? i imagine
> there's a
> > decent amount of dust cleaner and hair dryers involved but i'm hoping
> some
> > of you have some recommendations for something resembling a hobbyist
> budget
> > temp chamber to make things a bit more objective and repeatable.
>
> I use a Gallenkamp "economy incubator size 1" that I picked up on ebay
> for very little.  It's quite large, but gives a stable temperature
> environment.  It only heats, so that's anything above ambient.  It
> doesn't have a fan, which for some tests can cause problems (air flow
> cooling) and for home use it's good enough.
>
> I also have a fridge in the same room, which is mainly used for
> keeping beer cool, although it can also be used for single-point low
> temperature tests (about 4 Celsius).  For anything inbetween I need to
> wait for winter....
>
> Oh, and to do this properly you need a bunch of thermocouples,
> superglue, and a means of recording the temperature against the other
> parameters you're measuring.  At work we use an Agilent 34970A and
> relay cards to monitor 5-6 points on the unit under test.
>
> Cheers,
> Neil
> --
> http://www.njohnson.co.uk
>
>
>
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