Re: 475 questions


Still great advice for later when I'm working on a DUT with a SMPS. :-)

On Thu, May 28, 2020 at 03:34 PM, <> wrote:

Excellent advice, Eric!

Now I'm glad I just put that incandescent bulb in series when I turned it on
the first time. Not that I have a variac (yet).


On Thu, May 28, 2020 at 12:53 PM, Eric wrote:

I would test the rectifiers the silicon is usually pretty resilient and
normally grossly fails "open or short". I have only run in to one transistor
so far that has "kind of" failed that one took a 576 to find it, was out of
fluke 5200A. However do NOT bring up a 400 series scope slowly on a variac.
The 400 series have switching power supplies they are not the linear
They can over current when the line voltage drops to low to regulate and can
be damaged. Slow up on a varic is ONLY good for linear power supplies.

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