On 2018/02/02 1:19 AM, Phil Allison wrote:
wrote:

------------------------

Actually the ESR meter was correct.


** The good reading was **misleading** you ****ing moron.


Actually I saw the 100 ohms and assumed that means bad.

I read too fast and thought too slow. You could have worded it
differently and I wouldn't have missed part of it.


** The Bob Parker ESR meter has an auto-ranging, two digit display that over flows above 99 ohms. It shows ESR values from 0.01 ohms to 99 ohms. The black button zeros the reading before measurements and also cycles the meter on and off.

http://i44.photobucket.com/albums/f9...SCF0045-86.jpg

The "good" 22uF, 500V electros showed readings close to 1.5 ohms while the "bad" ones were completely open. In reality, 2 of the 3 "good" electros were just about to fail open circuit.

Electro caps normally dry out and go high ESR fairly slowly, ones that test perfect one day and go DEAD the next are not playing fair.



..... Phil


I use (and sell) Bob's ESR meter kit (over 600 sold since 1999). The
only improvement I can suggest is to use a regular fixed range digital
ohm-meter in parallel with the leads to be sure the low reading isn't
actually a shorted component.

The meter is might also be useful for evaluating lead acid (and other)
batteries... UPS batteries for example - leave a pair of wires connected
to the battery (hanging out of the case) and check the ESR of the
battery once in a while.

John :-#)#

--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."