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100/100 JJ vs 100/100F&T Electrolytics scroll down and read bottom to top

97.95.43.235
Posted on July 26, 2016 at 15:40:13
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005


ESR is 1.4 ohms


Leakage is at 180ua after 3 min and dropping


THe other section is 4% DA


F&T is 101uf


This is the F&T at 13% DA.


This is the other section of the cap at 6% DA


Dielectric absorption is bad at 96%. Even tho the cap is NOS,when I reform it,it should fix the DA.


ESR is 2 ohm


leakahe resistance is 1.15m and climbing


453ua and it stated at 3.5ma but I snapped it at 453ua and was still dropping.I held it for 4 min to get to that point.


JJ cap 101mf
I want to mention a couple things.Electrolytics have much higher leakage than film caps by nature and one of the reasons for that is,they work under a stressed dielectric.When a lytic initially charges,leakage current is high by comparison but as the cap charges up,it starts to drop but very slowly. A film cap will stabilize in about 5 or 10 seconds but a lytic I had to hold the button down for 4 minutes and it was still dropping.Dielectric absorption is also higher on a lytic.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

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RE: 100/100 JJ vs 100/100F&T Electrolytics scroll down and read bottom to top, posted on July 27, 2016 at 13:46:52
Lee of Omaha
Dealer

Posts: 1800
Location: Omaha NE
Joined: September 8, 2006
 Mike,

First, thanks for doing and publishing the work on capacitors that you're doing. How about publishing the work when you're finished either here or on your own site? I would pay a few bucks for access to the finished work, which seems appropriate for the amount of time you're putting into it. I looked for that nice piece of test equipment you're using...they're not cheap!

Also, I wonder...if you bypass a 'lytic with either a silver mica or a paper in oil cap does it reduce the dissipation factor or have other measurable (not just audible) improvements?

Finally, are all the brown old "lumpy" capacitors silver mica? I was wondering where to get them, and the ones I see on eBay look like the ones I have a bunch of. Maybe I'm already set? Are all silver micas created equal or are there ones to seek and ones to avoid?

 

RE: 100/100 JJ vs 100/100F&T Electrolytics scroll down and read bottom to top, posted on July 27, 2016 at 22:40:58
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005



"I bought it on Ebay in a bid for 200 dollars about years 8 ago.When I got it,it had no power supply which is like a wall wart more or less,and no test leads.Sencore at the time wanted 36 dollars and I didn't buy it so I called them 4 years later and it was 78 dollars..THey also wanted 22 dollars for the test lead.It's only an 18vdc to 20vdc power supply so I found one off an old 19vdc 2.5 amp one off an HP printer and then I had to buy the cord for 25 dollars because it had that unique plug on it..The power supply for 78 dollars had one on it already as when it was 36 dollars but since I had an HP supply,I just bought the new cord off Ebay for 25 dollars.The test leads I bought for 7 dollars on Ebay.
When I hooked everything and started testing caps and inductors,everything worked great..What didn't work was the high voltage that you can dial up to 999vdc..I could dial it up to 999 but,the max it would put out was 25vdc.I could do every test but leakage current so I opened it up and trouble shot it and ended up replacing the two mosfets you see in the back standing up in the upper right hand corner next to each other. I crossed them to NTE and 24 dollar later it fixed the problem.I did have to tweak the voltage adjustment so it would match what I measured on the Fluke.If set it for 800vdc,it would 789vdc but a little adjustment in the manual put it dead on the money.

Lee,you don't have to pay me to test caps,It's my pleasure and I can post or email any info you want..I have most every common capacitor made other than Deulands..Name a cap and I can test it for you.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

RE: 100/100 JJ vs 100/100F&T Electrolytics scroll down and read bottom to top, posted on July 28, 2016 at 14:25:10
Lee of Omaha
Dealer

Posts: 1800
Location: Omaha NE
Joined: September 8, 2006
 Mike,

I wasn't exactly offering to pay you to test caps.

What I'd like to see is your completed work on measuring caps published. With the amount of work involved it seems proper that the rest of us should be willing to pay some nominal sum for access to what will be an unduplicated reference work that will help us decide what to install where in our equipment.

You charge for repairing and customizing equipment that others benefit from; don't feel shy about creating intellectual property that others benefit from and profiting from it (or at least getting something monetary from it).

 

RE: 100/100 JJ vs 100/100F&T Electrolytics scroll down and read bottom to top, posted on July 28, 2016 at 16:17:53
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005
 Lee
I understand what you are saying.I don't do this for a living.I actually teach college auto electronics and emissions this so was a hobby I turned into a little prosperous fun.I used to work for Westinghouse for nine years when I lived back east and then when I won custody of my daughter,I moved back to Michigan to be near family.In Michigan we don't have many electronics firms so I was able to do the next best thing and marry my two favorite hobbies,cars and electronics,after procuring an automotive electronics minor. The rest is history.

"What I'd like to see is your completed work on measuring caps published. With the amount of work involved it seems proper that the rest of us should be willing to pay some nominal sum for access to what will be an unduplicated reference work that will help us decide what to install where in our equipment."

I will gladly do that..The only reason I don't feel comfortable charging for it is because I have gotten so much free reciprocal information and many from your posts as well,that's why I don't feel compelled to charge for it.

Now if I had written a complete text that contained lots of pages,that might warrant some compensation but other than that,I would feel horrible charging you guys for info that we all share. That was very nice of you tho to suggest that time is worth something which it is.I just get too much pleasure in sharing and would have too much guilt.

For rebuilds,upgrades,and repairs,that's a different story.That I charge for.

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

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