When the resistance between the box terminals is at least four times
the resistance of the power leads, you will deliver four times the
power to the box as to the power leads.
Start with a cold check on the two resistance values - the part that
gets hotter will get higher in resistance.
Brian Whatcott?? Altus OK
On 10/30/2014 4:00 PM, Andrew Aurigema
eosraptor@... [VacuumX] wrote:
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Dave,
I have a 280 amp resistive heater box ( Leskers ) that I
have tried to make glow several times.? It always ends after a
few seconds with the wiring getting very hot.?
My 5kw welding transformer can put out the amps ( about
1000 amp at 5 vac ) but I cant seem to get it thru the chamber
wall without melting power transfer cables.? I have a 3/4 inch
dia copper rod high amperage pass thru ( that came with the
chamber ) and have 3 each 3/8" stranded copper wire cables
running from the pass thru to the little tantalum box. Only
one cable is shown in the picture but now there are 3 of them.
?
I just cant make that box glow red before the power cables
do. ?
?? ?
?
So I am thinking of switching to plasma sputtering like the
big boys do. ?
The big transformer works fine for driving the 36 emitters
around the chamber ( 4 at a time ) so laying down aluminum is
no problem.? It is putting down the overcoat that I cant seem
to get started on. ?
So do you have any suggestions on how to make the tantalum
box glow red or where to get a plasma system cost effectively
???
Drew in sunny Florida
