Altair-what do I do first

"( note: don't use a variac on a switcher supply! )" Why not? We do it all the time, for checking what the low and high voltage cut-off point of a switcher is. We also vary the frequency all over the place. I don't know switchers in general, but ours suddenly start switching as the voltage hits 90V on the up-test, and about the same on the down-test. It may not be *useful* do to so for testing the device, but it won't cause any damage in any of the number of supplies we've tested. --John -----Original Message----- From: cctalk-admin(a)classiccmp.org [mailto:cctalk-admin@classiccmp.org]On Behalf Of Dwight K. Elvey Sent: Wednesday, September 25, 2002 18:16 To: cctalk(a)classiccmp.org Subject: RE: Altair-what do I do first [ snip] ( note: don't use a variac on a switcher supply! ) Later Dwight