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#21 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,843
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![]() you take the readings as a whole.
if capacitance and esr look o.k. then v-los you think about, but it's more common with high v-loss to also have high capacitance - then you know the cap is fucked. best i'v seen was 3300uf caps reading over 9000 ![]() |
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#22 | |
master hoarder
Join Date: May 2008
City & State: VA (NoVA)
My Country: U.S.A.
Line Voltage: 120 VAC, 60 Hz
I'm a: Hobbyist Tech
Posts: 10,860
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![]() Quote:
![]() Well, these are probably good contenders: ![]() Rubycon MFZ 6.3V 2700 uF reading ~6300 uF And Sanyo WF 6.3V 1500 uF reading over 4000 uF |
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#23 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,843
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![]() an un-molested GM328A!!!
you need a rotary encoder and a faster crystal and a better regulator ![]() |
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#24 |
Member
Join Date: Feb 2021
City & State: Minsk
My Country: Belarus
Line Voltage: 230VAC 50Hz
I'm a: Knowledge Seeker
Posts: 53
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#25 | ||
master hoarder
Join Date: May 2008
City & State: VA (NoVA)
My Country: U.S.A.
Line Voltage: 120 VAC, 60 Hz
I'm a: Hobbyist Tech
Posts: 10,860
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![]() Quote:
![]() I like that they guy is showing actual V_loss with higher voltages (26V in his video, if I understood correctly) and over a long period of time, therefore being able to get a more accurate estimate. And also the theory of how he is calculating it! Very good and informative. However, in the case of electrolytic capacitors, I think we also have to remember that -used- capacitors will become pre-formed to a certain voltage after being used in a circuit for a very long time - e.g. 6.3V cap used on a circuit that handles only 2.5V will make the cap "accept" up to 2.5V easily, but any higher voltage will experience a much greater V_loss. Thus, for electrolytic capacitors at least, V_loss can be very non-linear depending on the test voltage used. On that note, if these cheap testers show high V_loss on a cap, chances are that it's in pretty bad condition already. I say "chances", because sometime I have seen caps fool the meter to display high V_loss (or a few polymer caps, in particular) without there being anything wrong with these caps. Perhaps someone should make V_loss a separate function on these cheap testers that measure it over a longer period of time and with a higher voltage applied onto the cap, just like in the video - then V_loss could become quite accurate, possibly. Quote:
![]() Last edited by momaka; 03-13-2022 at 07:24 PM.. |
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#26 |
Solder Sloth
Join Date: Nov 2012
City & State: CO
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 7,206
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![]() It's over 9000!
Ugh want something to read not watch... |
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#27 |
master hoarder
Join Date: May 2008
City & State: VA (NoVA)
My Country: U.S.A.
Line Voltage: 120 VAC, 60 Hz
I'm a: Hobbyist Tech
Posts: 10,860
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#28 |
Solder Sloth
Join Date: Nov 2012
City & State: CO
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 7,206
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![]() Transcript with finger pointing? Or do I still have to wait for the whole thing to be played?
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