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| A quick teardown of Capasitor Wizard ESR Meter, a few pictures. |
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| Jay_Diddy_B:
Hi, This is interesting reading. It tells you how to repair the Capacitor Wizard: http://www.midwestdevices.com/_pdfs/Sbullit8.pdf Here is a picture showing part of the board, component side: http://howardelectronics.com/ieinc/images/Capwizsavr%201.jpg There is another picture here: https://www.howardelectronics.com/ieinc/CapSVR%20Install%20Instructions.pdf This patent describes the protection circuit: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=%22Capacitor+Wizard%22&OS="Capacitor+Wizard"&RS="Capacitor+Wizard" If you want an ESR meter with really good protection, build the ESR meter adapter described in this thread: https://www.eevblog.com/forum/projects/esr-meter-adapter-design-and-construction/msg341177/#msg341177 Regards, Jay_Diddy_B |
| The Electrician:
I wonder if the "CapSVR" add-on kit is just the transformer/diode arrangement described in the patent. |
| ErikTheNorwegian:
--- Quote from: The Electrician on March 12, 2014, 11:18:52 pm ---It is claimed that the Capacitor Wizard applies a sine wave to the DUT: http://midwestdevices.com/_pdfs/Tnote3.pdf Erik, would you connect a capacitor that's not too big, say a 10 uF electrolytic, to the capacitor wizard and look at the waveform across the cap with a scope to verify if it's really a sine wave? --- End quote --- The Capacitor Wizard model CAP-1B had a rather "bursty" sinus 102,8 KHz. 3,2 mV and the Electronic Design Specialist EDS-88A CapAnalyzer II had the same "noisy" more triangle than sinus 124KHz ant 3 mV. Se if i can get some pictures taken if its of interest, but really nothing to see. The reason i bought the CAP-1B from Capacitor wizard, is that the "wand" (Probes are way better to use on some cards than the tweeter with thin copper contacts) on the EDS-88A is way better. Lock at the pictures. The tweezers is ok on small boards where you have to/can use it with one hand. But if there is a lot of corrosion, lacquer etc. on the board, the sharp probes of the CAP-1B is the best, but i have to use both hands. Fluke AC72 Alligator Clip Set fits right on, and makes it easy to connect onto a capacitor if necessary. I must say that both testers do what they claim, easy and very quick. I enjoy the different beeps of the EDS-88A when fast going over a ex mainboard on a computer, don’t need to look at the meter, if good or bad. But if in doubt, the table has to be searched and you have to read the table for info. That takes time. And the automatic discharging that the CAP-1B don’t have is a big plus on some jobs. The CAP-1B, has a meter that is clearly marked BAD - COMPAERE - GOOD and is quicker to read. So i guess, both meters has its + and -. Some like the mother, some the daughter and nerds are hands on, as we say here in Norway! There is a place for both on my bench. (Instruments that is!) |
| Jay_Diddy_B:
--- Quote from: The Electrician on March 13, 2014, 04:15:17 pm ---I wonder if the "CapSVR" add-on kit is just the transformer/diode arrangement described in the patent. --- End quote --- From the photographs I believe that it does. It is the circuit from the patent plus a coupling capacitor in series with the transformer primary. The idea is for large voltage the diodes conduct and the current in the two windings cancel. For small signals the diodes do not conduct and it behaves like a transformer. I am not sure how well it works. Jay_Diddy_B |
| The Electrician:
--- Quote from: Jay_Diddy_B on March 13, 2014, 11:17:54 pm ---I am not sure how well it works. Jay_Diddy_B --- End quote --- The patent says the transformer has to resonate at the frequency which is applied to the DUT, and then it works well. |
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