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Old 7th June 2013, 11:27 PM   #41
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Join Date: Mar 2007
Location: California
I ordered one of these testers from Ebay seller "frank-studio*". Shipping to USA (California) took about 1 week via China Post, which is good compared to other shipments I have received from China using the Post. The item was packed reasonably well.

I downloaded the "instructions" from post #10 in this thread, which seemed to be more of an assembly guide but did give some info on conducting tests, and limitations. It's a useful read.

I did a few comparisons of passive component measurements with other equipment that I own. I cannot say that the other equipment is well calibrated enough to be a "reference" but the comparisons should be useful if nothing else.

RESISTORS:
compared with measurements from a B&K 2830 4-digit multimeter:
carbon 5%: TESTER: 17.49k; B&K: 17.32k
carbon 5%: TESTER: 6.21k; B&K: 6.16k
carbon 5%: TESTER: 8.93k; B&K: 8.86k
51k MF 1%: TESTER: 51.26k; B&K: 50.9k
1M MF 1%: TESTER: 1003k; B&K: 993k


CAPACITORS:
compared with measurements done using a Smith and Larson Woofer Tester 2, version 4
10nF ceramic: TESTER: 9.37n; S&L: 9.47n
1uF Alu Electro: TESTER: 2.25u; S&L: 1.12u
10uF Alu Electro: TESTER: 10.23u; S&L: 7.70u
22uF Alu Electro: TESTER: 22.71u; S&L: 13.8u
100uF Alu Electro: TESTER: 101.8u; S&L: 66.7u
6800pF 5% WIMA FKP4: TESTER: 6.71n; S&L: 7.03n
22nF 1% Vishay MKP1837: TESTER: 21.67n; S&L: 22.95n
470nF 2% PP: TESTER: 466n; S&L: 488n
8uF Solen 400V PP cap: TESTER: 7.96u; S&L: 8.16u


Some interesting results. Unfortunately I don't have equipment that is sufficiently new to be well calibrated, and I don't have very tight tolerance references either. What I found was that:
  • For resistors, the TESTER and my old bench meter seem to be in good agreement, with some offset (likely the old meter!).
  • For capacitors, it looks like the TESTER is better than my S&L at measuring capacitors. This is not easy to say for sure, because for the 1% and 2% caps the values are close for both units. But the results for the 1, 10, and 100uF aluminum electrolytic caps seems to be way off for the S&L.

For the low cost of the TESTER, this seems like a great piece of gear to have. It's small, lightweight, and portable. I really like that the TESTER gives me the ESR of the caps when I test them. I would love to see more careful testing of its accuracy and precision, but I don't have the capability to do this kind of investigation. All in all, I am very glad to have this in my toolbox!

-Charlie
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Old 8th June 2013, 07:07 AM   #42
neskor is offline neskor  Serbia
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is it possible to do in circuit ESR measurment?
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Old 10th June 2013, 12:23 PM   #43
The Dastardly Dad of Three
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Nope .... not with this little gadget
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Old 11th June 2013, 04:20 PM   #44
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Join Date: Jun 2013
Could you give more feddback on the ESR Tester with 4mm Sockets? Emardee, anyone?
Does it worth the money?
I am thinking to buy one of those too and would like to have more information from you.
Thanks.
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Old 8th July 2013, 08:48 PM   #45
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Join Date: May 2013
Thumbs down TT tester: Is a 12 volt battery OK?

I purchased the Chinese version from eBay My World - frank-studio* via ebay.I have a couple questions.

I have mounted it in a small plastic case where I do not have enough room for a 9V battery inside. I can mount the battery outside the case, but I wonder if this circuit can be powered by a small A23 type 12 volt battery? It would physically mount inside the case OK. In other words, is there sufficient regulation built in to offset the extra 3 volts?
Additionally, when the circuit is activated without any device connected to it, it indicates 32pf residual capacitance. This may be the result of extending the on-board terminals to banana terminals and a transistor socket for more convenient test connections. This is a bit of a concern when measuring small value capacitors? Can this be compensated for or nulled out in some way?Your attention is appreciated.
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Old 12th July 2013, 03:38 AM   #46
The Dastardly Dad of Three
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There is a calibration procedure outlined in the document in post 10. That will sort you out I would have thought.
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Old 21st July 2013, 12:11 AM   #47
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Join Date: May 2013
Default Calibration proceedure for capacity?

I downloaded the .pdf file and read it. I see references to "auto-calibration" and all kinds of dialog and graphs about calibrating caps, but do not see how to engage it. It reads like something that has to be done from a computer in software. Can you offer any more insight?
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Old 19th August 2013, 07:22 AM   #48
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Join Date: Aug 2013
Hello.
Newbie here.

I ordered this tester few months ago. It was very usefull and easy to use. I found some bad capacitors with that.

Maybe i have damaged it by testing accidentally some charged capacitor, because now it not work at all. When i push the test button all looks ok. It shows battery voltage on the first line, and "Testing" on the second line. After few seconds display shows "Cell". Same thing is the test terminals shorted or open. Is there anything to do with my little experience?

Thanks in advance.
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Old 21st August 2013, 01:18 PM   #49
The Dastardly Dad of Three
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It sounds to me that it's dead ....
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Old 23rd August 2013, 12:47 AM   #50
RNMarsh is offline RNMarsh  United States
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Location: 2457 Cascade Trail; Cool, CA. 95614
Yes, you probabaly damaged it with a charged cap. In any cap tester you need to discharge the cap before testing it.
Sorry, you found out the hard way.

-RNM
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