Power factor correction power supplies has not been a BIG problem with my
OLD recycled equipment.
I tried to Cover that case in my end note,
With switchers, turn the variact to normal and use the other safety features
and a big enough light bulb to keep from blowing it all up if something is
wrong.
ws
*****************
Poul-Henning Kamp phk at phk.freebsd.dk
In message "WarrenS" writes:
I don't plug ANYTHING new to me, directly into the line the first time I
try
it.
(especially if it had a blown fuse)
Here is the solution that I use for a universal, general purpose, tester
for
Old (and new) equipment.
That procedure is fine for linear power-supplies, but not resonably
modern switch-modes. In particular, anything that has PFC correction
is not going to respond too well to variable voltage like that.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
***************
I don't plug ANYTHING new to me, directly into the line the first time I
try
it.
(especially if it had a blown fuse)
Here is the solution that I use for a universal, general purpose, tester
for
Old (and new) equipment.
This is a great tool that can be used for trouble things that draw too
much
current, has shorts, for reforming caps, Testing line voltage sensitivity
etc, etc.
First time powered up test equipment is powered from:
1) A line voltage rate light bulb in series, starting with a low wattage
and
working your way up.
The light bulb acts Nonlinear variable dropping resistor, which act like a
current limit and will limit the max current to a safe value but still
have
minimum effect at lower currents due to it's Hi TC.
2) The voltage to the Light bulb comes which from adjustable variact.
The voltage rise and the Time at each voltage setting is a learned
function
and depends on what is being tested.
If you're in a hurry, set it to the nominal line output and flip the
switch.
The rest of the stuff will still provide protection.
3) The Variact is plugged into a KillAwatt meter
Used to constantly monitor the power, If it shows too much power is being
used, ... Well don't let it do that..
4) The Kill-a-W is plugged into a solatron 1 to 1 line regulating
transformer.
My Line regulating Solitron has the very desirable built in characteristic
that it goes into a saturation mode that limits the max output power if
overloaded
If not overloaded, it outputs a constant voltage.
5) Have a few resetable and/or standard fuses in there to be over safe.
The proper use of the variact's output voltage has a learning curve,
because
equipment with switchers behave differently than things with linearly
supplies
ws
*****************
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