Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I think the words "30 year old cap" answer your question.
Really? Even though the ESR is 2x better (and still in the good range) on the "30 year old cap"?
I got a cap kit with 7 caps in it. One new cap was bad and 3 new caps had worse ESR ratings than the ones on the board. If I just installed the kit blindly, I could be worse off than I am now!
I am just trying to understand when to follow the ESR meter and when to follow other factors.
Thanks!
That is not really true. Capacitance is a measure of total charge that a capacitor will hold. ESR is a model of how the part can deliver current. It's not a perfect analogy, but think of one like the size of a gas-tank and the other like the delivery hose. They're different measures and one can look fine while the other is inadequate.If it's capacitance is still what it should be then there's absolutely no point replacing it as far as I'm concerned.
Install the new one it if the capacitor is causing a failure on your circuit board. Otherwise don't obsess about it. Yes ESR is a good indication of the health of the capacitor but:If I have a 30 year old cap whose ESR is half of the one I just purchased, should I install the new one?
Really? Even though the ESR is 2x better (and still in the good range) on the "30 year old cap"?
I got a cap kit with 7 caps in it. One new cap was bad and 3 new caps had worse ESR ratings than the ones on the board. If I just installed the kit blindly, I could be worse off than I am now!
I am just trying to understand when to follow the ESR meter and when to follow other factors.
Thanks!
I'm perfectly aware of that..That is not really true. Capacitance is a measure of total charge that a capacitor will hold. ESR is a model of how the part can deliver current. It's not a perfect analogy, but think of one like the size of a gas-tank and the other like the delivery hose. They're different measures and one can look fine while the other is inadequate.
Location Value ESR New ESR
======== ==== === =======
C1 (Vid) 470/16 0.17 0.21
C25 10/16 6.0 1.0 (10/63)
C1 470/16 0.19 (BAD)
C20 22/35 5.8 1.0
C21 220/25 87 0.25
C22 100/16 0.78 0.56 (100/25)
C44 10/16 5.3 1.0 (10/63)
Holy shit!....C21....ESR = 87
Edward