> We are designing a few LED based products that are built around
> high-brightness LEDs and have a PIC, power supply components, heat
> sinks, generic electronics, etc.
>=20
> The prototypes seem to be performing well in our workplace, i.e. no
> extremes of temperature or humidity, no g-forces, no mishandling...
>=20
> We are seeking suggestions for DIY reliability and lifetime testing of
> these products, something like "Highly Accelerated Life Test" that we
> could do in our own location using easily available instruments. We'd
> like to do this initially at our end to catch the design flaws
> ourselves, before we send the products off to a test lab that does
this
> professionally (but cost more).
>=20
> Some examples:
> 1. Oven with a pan of water for temperature and humidity testing.
> 2. Oven and a refrigerator for temperature cycling.
> 3. Some kind of shaker for vibration analysis.

Te company I did my apprenticeship with had an oven that they used for
temperature testing, it had a heating element and used CO2 for cooling.
It was possible to get down to around -10C, possibly -20C (it is so long
ago I cannot remember the exact temp), using this.

For vibration the factory had a rotating weight driven by compressed
air. It seemed to be a commercial component used to vibrate hoppers and
the like for bulk powder etc. It was mounted onto a suitable frame by
our workshop, and someone found that they could get two modes of
vibration out of the system by hitting the frame just right - I assume
this happened to change the speed of rotation of the eccentric weight.
--=20
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--=20
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