2014-07-16 23:29 GMT-03:00 Jon Elson <el...@pico-systems.com>: > Sometimes a deteriorated cap is plainly obvious, sometimes there > is no visible sign at all. You could charge the cap to some > voltage and > observe the rate at which it drains. For 1800 uF, with a 10 > K resistor, > the voltage should fall at an exponential rate such that it > reaches > 36% of the initial value in one time constant. One time > constant > would be .0018F * 10K Ohms = 18 seconds. So, if you charged > it to 10 V, in 18 seconds it should fall to 3.6 V. If it > falls to > zero in a couple seconds, that is a clear indication the cap is > dead! Sometimes, they can develop high internal series > resistance, > so another test is to charge it to 10 V or so, and then > short the > cap with a bit of wire. If there is no spark at all, it > would indicate > high series resistance. >
It's good to know that. I'm taking them to a friend of my brother that has bought a capacitor tester so may that tells me if they're ok or not. Also, it's not hard for me to try what you described so I'll do that too. Even if the problem are the caps or not, it's nice how much one can learn from these circumstances :). Thank you Jon. -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck Code Sight - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
