ESR Reading

[Gregory]

When you test a cap with a ESR meter should the High resistance indicate thet the cap is US.
EG I have two 250 v 220uf electrolytic caps.
The ESR reading on one is 0.06
The other one is 0.19
Which one is US.
Greg

 

[positronicle]

In my experience, high ESR = bad cap. I'm not familiar with what you are referring to by "US".

 

[ronsimpson]

I just ran a search for 220uf 35volt capacitors. I used 35 volt because I know there are many different types of capacitors at that voltage. I found caps rated at 80mOhm, 150mOhm, 200mOhms, 720mOhm, 800mOhm, 840mOhm. Then there are some caps where the ESR are not states. (real high)

At 250 volts I found a small range of ESR.

ESR is generally not rated at +/-5% but more like +/-35%, or more. If if often rated as 0.1 ohm max, where typical is not stated.

 

[Gregory]

US is short for unservicable meaning not working.

 

[killivolt]

What the

I thought I saw a big discussion on this earlier.

(I must be on drugs. ) ?