ESR Reading - Electronic Circuits Projects Diagrams Free

Gregory · 28th April 2008, 09:55 PM

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 · 29th April 2008, 02:07 AM

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

ronsimpson · 29th April 2008, 02:38 AM

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 · 29th April 2008, 03:19 AM

US is short for unservicable meaning not working.

killivolt · 29th April 2008, 03:22 AM

I thought I saw a big discussion on this earlier.

(I must be on drugs.

) ?

28th April 2008, 09:55 PM	#1 (permalink)
Gregory Experienced Member Join Date: Nov 2003 Posts: 125	ESR Reading 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

29th April 2008, 03:22 AM	#5 (permalink)
killivolt Experienced Member Join Date: Mar 2008 Location: U.S. Posts: 309	What the I thought I saw a big discussion on this earlier. (I must be on drugs. ) ? __________________ Truthiness Monkeys : Obedience, Ignorance, Fear.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Latest
capacitance meter related question	whiz115	General Electronics Chat	17	8th April 2008 10:48 AM
reading an oscilloscope	Fenris	General Electronics Chat	4	24th March 2008 12:08 PM
IDE HDD reading sector	v1r05	Micro Controllers	5	27th January 2008 09:49 PM
rms reading	mpj111	General Electronics Chat	3	10th July 2006 12:37 PM
Specifications Applied	Caltech	General Electronics Chat	1	25th December 2003 05:00 PM

29th April 2008, 02:07 AM	#2 (permalink)
positronicle New Member Join Date: Aug 2007 Location: Hot Springs Posts: 22	In my experience, high ESR = bad cap. I'm not familiar with what you are referring to by "US".

29th April 2008, 02:38 AM	#3 (permalink)
ronsimpson Experienced Member Join Date: Apr 2007 Location: Loveland, CO USA Posts: 373	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.

29th April 2008, 03:19 AM	#4 (permalink)
Gregory Experienced Member Join Date: Nov 2003 Posts: 125	US is short for unservicable meaning not working.