All my bench testing has used the switcher.  The only difference is that the bench test uses a bench supply as the input to the switcher (25V @ 2A max) whereas the field units are connected to a battery bank (25V @ 2000A max :-)  So theoretically the switcher shouldn't be the issue.

Nonetheless, I now have the field unit powered by the same supply I used on the bench, same cable too :-)  One can't be too anal in removing variables when tracking these things down!


On 5/14/07, Dave Hylands <dhylands@gmail.com> wrote:
Hi Steve,

> I suppose I could connect the field unit to a bench supply to totally rule
> out the supply as an issue . . .

I think that would be wise. The particular product I was working with
was a DPAC Airborne wireless module, and while it only drew about 1/2
amp as measured by my multimeter, it could draw as much as 2A
instantaneous current. Trying to deal with the instantaneous current
supply was causing the DPAC unit to reset itself.

The DPAC unit would work flawlessly off my bench supply and I never
could get the switching regulators I had on hand to work with it.

Dave Hylands
Vancouver, BC, Canada

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