Re: O.T. Question for John T

Posted by John T on August 04, 2006 at 10:48:39 from (66.244.90.5):

In Reply to: O.T. Question for John T posted by Karl Hamson on August 04, 2006 at 07:57:54:

Karl, EXCELLENT explanations from IH with which I totally agree. Heres another take on your question.

OKAY, I can tell you how to test a condensor with an old fashioned analog swinging needle type ohmmeter which will tell if its DEFINITELY BAD HOWEVER IT WONT TELL IF ITS GOOD>>>>>>>>> i.e. just cuz it passes, it could still be bad and you really need a regular capacitance tester to tell the full story.

Place an analog ohmmeter (like my old Simpson 260 or RCA WV38A etc) on the R x 1 scale,,,,,first discharge the condensor by temporarily jumping its leads/case together, then attach the ohmmeter and it should read like an open circuit of infinity ohms. If not say it reads a few or even several hundred ohms, its bad/shorted.

Nest again discharge it, place the meter on the R x 10000 scale, attach it across the meter and it should initially swing over towards a short circuit reading as the condensor charges up but then shortly "kick back" over to open near infinity ohms once its charged. If it dont it BAD.

A condensor to DC is initially a short circuit as its charging up but once charged its like an open circuit to DC passing no more current as the charges are built up opposite on the opposing plates.

Caution about sticking just any old condensor on there as if its NOT the correct capaciatnce rating (usually something in the microfarads range) the points will burn up quicker and/or the spark will be weaker. The coil will still fire with NO or a bad open condensor like IH told ya but the spark will be weaker. IH raised another good point in that if sized correctly the points build up evenly on both sides since the initial inrush of electrons from the coil in one direction (like when points open) is balanced by the return current flow when the points close and the condensor discharges.

Electrons have mass ya knowa and flow/arc across the points and into n out of the condensor which is like a big open unfilled bank just sittin there waiting to absorb some of the inrush of electrons when the points open. The electron inrush is from the coils inductance and the magnetic energy stored and when the points open current reallllllllllyyyyyyyyyy wants to keep flowing somewhere and would arc a bunch across the points BUT FOR the big open unfilled electron bank condensor sittin there screaming come in here come in here lol that way theres less arcing at the points n they dont burn up so soon.

I appreciate your kind words of thanks. When I was a young kid my grandfather n uncles n neighbors allllllllll helped me so I figure now that Im older its payback time and I enjoy helping others. I give electrical seminars at several of the national John Deere shows and used to write for the Green Magazine, its a fun hobby in my semi retirement years.

Yall take care n God Bles now,

John T Nordhoff in Indiana

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