Open Source ESR Tester (Looking for, don't have)
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From: Matthew Smith on 9 Apr 2005 03:28 Hi All I'm sure that the Peak unit (and others) discussed recently are very nice, but could anyone point me to an open source ESR tester, or at least the principles required to build one. For one, I want to save money but at the same time, I really like to make my own kit where practical. Yes, I could go Google, but sometimes it's nice to get real recommendations from real people ;-) Cheers Matthew Smith South Australia
From: mike on 9 Apr 2005 03:41 Matthew Smith wrote: > Hi All > > I'm sure that the Peak unit (and others) discussed recently are very > nice, but could anyone point me to an open source ESR tester, or at > least the principles required to build one. > > For one, I want to save money but at the same time, I really like to > make my own kit where practical. > > Yes, I could go Google, but sometimes it's nice to get real > recommendations from real people ;-) > > Cheers > > Matthew Smith > South Australia Use a time domain reflectometer. Just hook a scope to the cap and hit it with the fastest rise step you can muster. Keep it below half a volt amplitude so you don't turn on junctions. Stated another way, build your own TDR. If you know the source voltage and source impedance, you can easily calculate the ESR from the size of the initial step. You can also calculate ESL from the overshoot and capacitance from the time constant. Using this method, you know exactly what you're dealing with. You're not relying on some readout number that may or may not reflect what's really going on. mike -- Return address is VALID but some sites block emails with links. Delete this sig when replying. .. Wanted, PCMCIA SCSI Card for HP m820 CDRW. FS 500MHz Tek DSOscilloscope TDS540 Make Offer Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121 Wanted 12" LCD for Compaq Armada 7770MT. Bunch of stuff For Sale and Wanted at the link below. MAKE THE OBVIOUS CHANGES TO THE LINK ht<removethis>tp://www.geocities.com/SiliconValley/Monitor/4710/
From: Fastvale on 9 Apr 2005 09:30 > > For one, I want to save money but at the same time, I really like to > make my own kit where practical. > > Yes, I could go Google, but sometimes it's nice to get real > recommendations from real people ;-) > Matthew Smith > South Australia order it here: http://www.nuovaelettronica.it/it/pop/index.cfm?fb=scheda_kit&w.kit_id=4899 about 25 $ plus shipping. Absolutely performing!!!
From: Bill B on 9 Apr 2005 10:52 Matthew Smith wrote: > Hi All > > I'm sure that the Peak unit (and others) discussed recently are very > nice, but could anyone point me to an open source ESR tester, or at > least the principles required to build one. > > For one, I want to save money but at the same time, I really like to > make my own kit where practical. > > Yes, I could go Google, but sometimes it's nice to get real > recommendations from real people ;-) > > Cheers > > Matthew Smith > South Australia Here's about as cheap as you can get, provided you have a 'scope. I use mine quite a bit and have had pretty good success. Look here: http://octopus.freeyellow.com/99.html
From: Franc Zabkar on 9 Apr 2005 17:47 On Sat, 09 Apr 2005 16:58:10 +0930, Matthew Smith <usenet2005(a)spam.trace.yp.cx> put finger to keyboard and composed: >I'm sure that the Peak unit (and others) discussed recently are very >nice, but could anyone point me to an open source ESR tester, or at >least the principles required to build one. > >For one, I want to save money but at the same time, I really like to >make my own kit where practical. My local DSE store has Bob Parker's Mark I kit for ~AU$40. Only two left last time I checked. Otherwise try these: http://www.siliconchip.com.au/cms/A_103805/article.html http://www.siliconchip.com.au/cms/A_103243/article.html - Franc Zabkar -- Please remove one 's' from my address when replying by email.
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