Cap reformation question
cclist at sydex.com
Tue Dec 6 18:47:08 CST 2005
On 12/6/2005 at 7:03 PM Scott Stevens wrote:
>I would recommend using a high quality Constant Current/Constant
>Voltage bench supply. These have a 'current' and a 'voltage' knob
>on them and two meters (someetimes one switchable meter). The
>procedure I use is to set the voltage to the level that you want
>the capacitor to reach while disconnected. Then turn the current
>limiting way down and connect the capacitor. Monitor the current
>while turning it up slowly and leave it at some comfortable low
>level so the cap can form up. This process limits the current
>while the cap forms up. You can watch the voltage meter, which
>should climb up to what you had it set at, if the cap is any good.
Wouldn't this amount to the same thing as putting a hefty resistor in
series with a variac-controlled power supply with a voltmeter on the supply
side? Start low--the resistor limits the current--crank the variac up bit
by bit until the desired voltage is reached. A fuse isn't a bad idea
either, in case the dielectric just plain fails.
It's worked for me. And my power supply isn't anything more than a
transformer connected to the variac followed by a full-wave bridge
rectifier--no filtering needed.
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