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Author Topic: esr MEASUREMENT  (Read 7160 times)
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arash_tah
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« on: November 06, 2009, 09:57:35 21:57 »

Hi everybody
I am looking for a way to measure ESR of electrolit capacirors . As you know in designing switching power supply ESR of output capacitor play very important role in stability of the system because we need to adjust the parameter of the compesator based on the circuitry parameters on mysterious parameter is ESR. Almot non of the capacitor manufacturers do not tell any thing in this regard.
Is there any Idea to help me ?
 Please share
THANX
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borberk
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« Reply #1 on: November 06, 2009, 11:45:20 23:45 »

ESR is resistor connected in series with capacitor it is it's internal parasitic komponent. To measure only resistive part of total impedance you need AC current generator and synchronous detector which is sinchronized to this generator or in phase with it. Measured voltage is proportional to ESR and current amplitude.
If detector is in quadrature with generator then you measure voltage drop on capacitive part of impedance. Knowing the current amplitude and the frequency od generator it is easy to determine capacitance.
This is only one of measuring methods but most simple for realisation. Example circuits you can find in Elektor Magazine.
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DarkClover
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Still alive...


« Reply #2 on: November 07, 2009, 01:41:51 01:41 »

This could be helpful to you:

http://www.emcesd.com/tt020100.htm
http://www.mwrf.com/Articles/Index.cfm?Ad=1&ArticleID=5450
http://www.siliconchip.com.au/cms/A_103805/article.html (scroll down to the ESR-Meter)

Link collection about capacitors (+ESR Meter):
http://www.emil.matei.ro/links2.php
« Last Edit: November 07, 2009, 01:45:16 01:45 by DarkClover » Logged

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rmmrmm
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« Reply #3 on: November 07, 2009, 02:57:48 14:57 »

Look at this web page :
http://members.shaw.ca/swstuff/esrmeter.html

I made it 2 years ago and works really good .
I made comparisons with a comercial model and the differences are minimal.
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arash_tah
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« Reply #4 on: November 07, 2009, 03:36:48 15:36 »

Good idea but I want to measure the ESR of electrolit capacitors these circuits apply AC voltage to capacitor so they are not suitable for polar capacirors
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Malcolm
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« Reply #5 on: November 07, 2009, 04:47:46 16:47 »

ESR Meters Projects

DOWNLOAD:-

http://rapidshare.de/files/48647131/ESR_Meter--Projects.rar.html
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borberk
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« Reply #6 on: November 07, 2009, 06:38:59 18:38 »

arash_tah, you don't have to be afraid of AC signal on capacitors. It's amplitude is very much lower than breakdown voltage in reverse polarisation it's amplitude is only about 10-20mV. Malcolm gave you examples from Elektor.
 
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rmmrmm
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« Reply #7 on: November 07, 2009, 11:37:36 23:37 »

arash_tah , All meters use the same technique, beside is very cheap, only need a old needle multimeter ( 50 micro amper scale  and make a small external printed circuit board .
I tried others circuits before , and this was the best.
You wil find diferences betwen good and bad capacitors inmediately .
Dont waste time with complicated circuits , this one is good enough
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arash_tah
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« Reply #8 on: November 08, 2009, 05:24:17 17:24 »

Thanx
rmmrmm I dont want to disinguish between good and bad capacitors! My  main aim of this project is to measure the value of the ESR as accurate as possible because I need this value for seting the parameter of the compensator


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tAhm1D
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« Reply #9 on: November 08, 2009, 06:42:31 18:42 »

Hi arash_tah,
Low ESR capacitor is a must for smps circuits and reasons are amply known to you all. I tried to build ESR Meter and build also by taking schematics from Internet but the performance was not satisfactory. Since for smps circuit, I require accurate readings, I collected one Meter from Portugal,costs 50 Euro. It is very reliable and working perfectly for last one year without any hinderence. You can try it if you feel like.

It is made by one Mr.Vitor Manuel and the address is:
Rua de Mocambique L16 R/C ESQ.
2955-162 Pinhal Novo
Portugal.
 I have forgotten the name of the website. You can find it from the net.

« Last Edit: November 09, 2009, 03:56:30 15:56 by tAhm1D » Logged
HackerNo.1
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« Reply #10 on: November 13, 2009, 05:39:05 17:39 »

hi all,
esr meter is an essential equipment for s.m.p.s. circuit for efficient and durable performance. But many of us are not putting sufficient importance to it and hence face different types of difficulties in practical field as in s.m.p.s. circuit, all the parts must be perfect and appropriate. And capacitors, specially Electrolytic type plays a vital role. For proper utilization of those low esr type capacitors in circuits, specially in s.m.p.s. type, esr measuring meter is a must. Lot of circuits are there in the Net, but self made meters don't provide correct readings all the time, which I find. Hence, tested meters are required. Can anybody found out any other  reliable meter? If yes, please spell out and after judging all I want to purchase one for me.
« Last Edit: November 13, 2009, 05:41:14 17:41 by HackerNo.1 » Logged
RFaddict
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« Reply #11 on: April 13, 2012, 04:42:29 04:42 »

From a capacitor designer (Cyril Bateman) one of the best articles about the capacitor's problems


http://ifile.it/h7v1ico
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pjmelect
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« Reply #12 on: April 14, 2012, 05:54:16 17:54 »

To measure the ESR of a capacitor accurately I use a 70Khz square wave of 100mV amplitude and apply it to the capacitor under test with a 4.7R resistor in series. You can then measure the voltage across the resistor which is proportional to the ESR. On low values of electrolytic capacitors you have to take into account the reactance of the capacitor but that is a simple matter. This method is as accurate as the meters and the 4.7 ohm resistor. I have designed a PIC circuit to do the tedious maths for you and give a direct read out of the ESR and I hope to publish it here within the year.
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cup58
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« Reply #13 on: September 09, 2012, 08:56:34 08:56 »

arash_tah:

For an in-depth explanation about capacitors and their measurement, I can recommend the series of articles written by Cyril Bateman published in the UK magazine Electronics World. I understand Mr. Bateman worked in the capacitor manufacturing industry, so he really knows what he says. In my opinion, these are the best articles about capacitors. If interested, you can download the 7 articles "Understanding capacitors" from here:

http://techdoc.kvindesland.no/radio/passivecomp/

Hope this helps you
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egstudio
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« Reply #14 on: October 21, 2012, 03:13:06 03:13 »

The link that I have loaded is referred to one of his projects, the TanD Meter, very difficult to find in Internet.
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sarah90
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« Reply #15 on: November 18, 2012, 06:51:27 18:51 »

There is a lot of projects that use a pc sound card for lcr measurement including esr. For example http://www.sillanumsoft.org/ZRLC.htm
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mitsos
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« Reply #16 on: December 28, 2015, 06:38:35 18:38 »

hi

in the link below
http://www.paullinebarger.net/DS/

you 'll find data for electrolytic (mainly) capacitors from many (mainly east) manufacturers.

regards
mitsos

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hosmis
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« Reply #17 on: December 28, 2015, 08:35:50 20:35 »

Easy and perfect
R-C-L -esr



http://www.hobbielektronika.hu/cikkek/lcm3_alkatresz_mero_muszer_-_kit_lehetoseg.html?pg=1
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crunx
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« Reply #18 on: December 28, 2015, 09:32:48 21:32 »

Maybe I'm a bit lazy as I didn't bother to build a meter myself, when having a similar need.

I rather used my time, energy and materials-purchasing budget to build other kind of gadgets. Therefore I bought this neat little meter:

http://www.ebay.com/itm/LCD1602-Transistor-Tester-ESR-Meter-Inductance-Capacitance-Resistance-/262206585624

The same device is sold by many others, too - this ad is just one example.

The device is a lot cheaper (USD 7.99, including postage) than its components in retail, and this little meter has done what I expected it to do - including sorting of a high pile of unmarked inductors and helped to identify a couple of strips of "inherited" SMD ceramics capacitors!
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perithess
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« Reply #19 on: January 03, 2016, 06:45:38 18:45 »

I can suggest this meter. http://www.deree.com.tw/de-5000.html
I have it and I am very satisfied of it.
You can measure esr at various frequencies on the capacitance and on resistance mode.
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dR-mR
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« Reply #20 on: January 05, 2016, 01:31:33 01:31 »

I have the same meter,  DEREE DE-5000
 nice meter it does the job
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lifeguard
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« Reply #21 on: August 08, 2016, 11:58:59 23:58 »

I just brought one of these: http://www.ebay.com/itm/Mega328-Transistor-Tester-Diode-Triode-Capacitance-ESR-Meter-MOS-PNP-NPN-L-C-R-/171285924831?hash=item27e16fcbdf:g:3qYAAOxy039TOjhy

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OscarH
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« Reply #22 on: August 09, 2016, 12:17:25 12:17 »

Not sure if same than mine, but it sucks having to 1/ switch-on and 2/wait 1/2 seconds boot time for each test to be run...
OH
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