Rich,
Work out the math for the resistance needed, the work out how many of
what wattage in series/parallel is needed. Then mount them on a good
insulator like glass epoxy PCB without the copper, or such, I think we
used a pice of formica. Clean out a 5 gallon pail very thoroughly and
fill with distilled water. Actually, you won't need to meet the full
wattage rating using this method. We used this at work for some very
beefy supplies to set the current limits on about 15 years ago and it
worked great. The resistor array still exists and is configured so as
to be able to change the series and parallel combinations, and we still
use it for all kinds of loads, (not RF, thugh) ;^)
73, Gerry K8GT.
Rich Dailey, N8UX (2) wrote:
Maybe just on the edge of being on topic...
I just repaired (I think) a 50 amp astron rack supply. I intend on using
it to power two hf rigs (SO2R) and accessories. However, I wish to
load it up
to about 30 amps to check ripple and regulation without sacrificing my
station if something is wrong.
Any ideas on what I could use to load it up for a test?
Tnx,
Rich, N8UX
PS - Yes, I know I'm sacrificing redundancy. But I need to trade it
for desk space! -hi.
------------------------------------------------------------------------
---------------------------------------------------------------
The world's top contesters battle it out in Finland!
THE OFFICIAL FILM of WRTC 2002 now on professional DVD and VHS!
http://home1.pacific.net.sg/~jamesb/
---------------------------------------------------------------
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
---------------------------------------------------------------
The world's top contesters battle it out in Finland!
THE OFFICIAL FILM of WRTC 2002 now on professional DVD and VHS!
http://home1.pacific.net.sg/~jamesb/
---------------------------------------------------------------
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
|