Forum: Projekte & Code Transistortester AVR


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von Klaus R. (klaus2)


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...ich hab deine Daten per AVR mk2 geflasht aber es passierte nix. Egal, 
denn immerhin läuft es nun bei mir ja auch komplett und das war das 
höhere Ziel - Danke, KH!

Klaus.

von MisterGNZ (Gast)


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Hi everyone !, I have two nippon capacitors 10000 microfarad 63v, I 
measure with the conponent tester, the first is correct, the second 
measure: 33.01 millifarad (33000 microfarad), but its printed value is 
10000 microfarad, ???????????? help!!!

von Marcel D. (derri)


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MisterGNZ schrieb:
> Hi everyone !, I have two nippon capacitors 10000 microfarad 63v, I
> measure with the conponent tester, the first is correct, the second
> measure: 33.01 millifarad (33000 microfarad) …

The capacitor showing the larger value might be leaking, so the tester 
needs more charge pulses to reach the reference voltage level (see 
chapter 5.3.2 of the user manual).

Are you shure to have connected the two capacitors using the same 
polarity (- on the lower number test pin)?

Have they been discharged completely? Note that even after a short 
cicuit with a resistor such a large capacitor may restore a residual 
voltage between its terminals when the short is removed. This memory 
effect might influence your measurement.

Greetings, derri

von MisterGNZ (Gast)


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Hi Derry, thanks for the explanation.
the capacitors are new with esr .01, maybe it is the component tester, 
which has reading problems on large capacities

von Ben (Gast)


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MisterGNZ schrieb:

> ... maybe it is the component tester,
> which has reading problems on large capacities

Did you build the tester yourself or did you buy it?
Once i had the same error, and it was due to R11, I had made a mistake 
in the Assembly and had soldered a wrong Resistor.
With me, also with larger Capacitor values too high values were 
indicated.
In about every fifth Measurement a large Capacitor was correctly 
displayed.
R11 must have a value of 10k (look at the Schematic).
When i soldered the 10k resistor, everything was measured correctly.
Would be worth a look.

von Leon T. (ltumm)


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I had the same problem on 3 builds 1 2200 uF read as about 6850 uF. 
After trying everything it seems to be the capacitor, I tried another 
capacitor and it reads correct, both were new and bought together. Best 
way is to try a lot of other capacitors and check if a few or a lot of 
capacitors read much higher. If you have access to a bought capacitor 
meter you could check the capacitor on that.

von Klaus R. (klaus2)


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...habe mal versch gebrauchte Elkos von 3300 - 10000uF gemessen mit Pin 
1 + 3 (also C-Mess-Mode!). Alle passen 1A. Tester ist der umgebaute LCR 
T4.

EDIT: I measured several used elkos from 3300...10000 with dedicated (!) 
C-measure-mode on pin 1&3 and all are in spec...tester is the modded LCR 
T4 from above discussion.

Klaus.

: Bearbeitet durch User
von MisterGNZ (Gast)


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I noticed that the 10000 microfarad condenser, if I shake it, moves 
inside, it seems that it hits the walls as if the liquid inside it has 
dried, the good one does not move. capacitor to throw away?

von Klaus R. (klaus2)


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...you can check it with an voltage source, resistor and measure time 
until 66% of supplied voltage, its an e-fcn and then calculate C from 
known R, t & V. The basic way :) But if the other C is always good very 
likely the other C is bad - even if I do not really understand, why it 
displays a much HIGHER cap.

Klaus.

von MisterGNZ (Gast)


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maybe they sold me fake nippon capacitors

von MisterGNZ (Gast)


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Hi Klaus R. I gave 13v voltage to the capacitor, I had to disconnect 
because it heated a lot, new never used, the tester component works very 
well

von Klaus R. (klaus2)


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...take it appart to se whats inside :) So, yes, its very likely fake.

Klaus.

von MisterGNZ (Gast)


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Hi Klaus R. I opened it, look at pictures

von Marcel D. (derri)


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MisterGNZ schrieb:
> maybe they sold me fake nippon capacitors

Hi,

Searching the net I found < 
https://www.chemi-con.co.jp/products/relatedfiles/capacitor/catalog/KMHN-e.PDF 
> on the manufacturers site. There you find the exact dimensions of your 
caps. This could be a clue to determine a fake.

As of your pictures, they seem to show the original type, but your 
specimens might well be a few years old. The remaining capacity is 
largely dependent on storage conditions and duration, but could never 
increase to the triple value of the original. So the device measured as 
33.000 uF is (was) surely defective.

The fact that the cap heated up with only 13 Volts across shows that 
there was something seriously wrong with it. In general, old chem-caps 
may need reforming after very long storage durations, but then you must 
use a series resistor of a few hundred Ohms to limit the leakage 
current, and the voltage should correspond to the maximum operating 
voltage of the device (63V in your case). After several hours, maybe 
even days, the leakage current should drop to normal values. If this is 
the case, you can still use the device. If it keeps on leaking strongly, 
it is definitely dead and you should dispose of it.

I hope this helps,

derri

von MisterGNZ (Gast)


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Hi Klaus R. I threw it immediately, in order not to have unpleasant 
situations, I also have 4 RIFA18000 microfarad 35v capacitors, they too 
have wrong measurements, but they work, I also have 2 ROE 10000 
microfarad 50v, the measurement is ok, all new never used. I think when 
a capacitor moves inside, it is to be thrown away, do you agree?

von Marcel D. (derri)


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MisterGNZ schrieb:
> I think when
> a capacitor moves inside, it is to be thrown away, do you agree?

Yes, I do!

von Zhq S. (zhqsoft)


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How to modify the auto exit waiting time under the menu interface? Now 
it takes 1400 seconds. It's too long. I didn't find the relevant 
settings in the source code.

von Klaus R. (klaus2)


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...not in makefile and not in config.h?

Klaus.

von Zhq S. (zhqsoft)


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新制作了一只M644晶体管测试仪,大家来看看吧
https://oshwhub.com/zhqsoft/M644-TransistorTester

von Horst O. (obelix2007)


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Zhq S. schrieb:
> 新制作了一只M644晶体管测试仪,大家来看看吧
> https://oshwhub.com/zhqsoft/M644-TransistorTester

... ein neuer, gut ausgestatteter Clone im Anmarsch?

Gruß Horst

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