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Outer foil cap measurement with Hantek 6022BE
Outer foil cap measurement with Hantek 6022BE
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Old 20th June 2018, 09:00 PM   #21
diypass is offline diypass
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tone generator Tolvan Data
setted 100hz , sinusoid

i generate signal by sound card

do you want screen capture ?

could you draw exactly phisical connection ? probably i wrong in connections
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Old 20th June 2018, 09:01 PM   #22
JMFahey is offline JMFahey  Argentina
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Originally Posted by diypass View Post
too complicated for me
żżżżż?????? If that seems complicated, then you are not qualified to pass your test.
Pass? ... not even to *take* it.

Out of that video all you need to understand and do is the segment from 8:40 to 12:00 and nothing else.

Still looks difficult?

capacitor is auricap 3.9uF
At that capacitance value this measurement is irrelevant.

At 50Hz it shows around 800 ohm impedance so if diven from a low impedance, following grid will see it too, so minuscule electrostatic hum induced voltage there.

Meaning the tiny shield offered by outer foil actually does nothing from a practical view, it applies to very high impedance circuits (think 1M grid resistors) and small capacitors, so a highish impedance separates plate and grid circuits.

When just 800 ohm join them, "both sides are the same" and (poorly) shielding one or the other becomes irrelevant, since possible induced voltage is almost zero.
Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.

Last edited by JMFahey; 20th June 2018 at 09:16 PM.
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Old 21st June 2018, 05:51 AM   #23
Calvin is offline Calvin  Germany
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Location: close to Basel

in my companies office there seems to be quite some electro-smog in the air.
When I connect the legs of a Cap to the scope I can see a small signal sinewave on the display (a 10:1 probe on a LeCroy Waverunner 64Xs with a miniumum sensitivity of 20mV/div ... hence not even overly sensitive).
Simply holding the cap between my fingers increases the amplitude considerably, but differently depending on the orientation of the Cap.
The probe´s test pin is connected to the outer foil when the amplitude is higher and its lower when its connected to the gnd-strap.


btw. it was not too uncommon in earlier (tube) times that a ring was printed on the cap´s casing, marking the outer foil pin.
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Old 21st June 2018, 07:14 AM   #24
lcsaszar is offline lcsaszar  Hungary
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Location: Budapest, Hungary
Calvin, thanks for re-confirming my earlier remarks.

By the way, are there any capacitors using a winding technique where the outer ends of the foils are half-turn apart from each other? Then there won't be "inner" and "outer", both foils will be outer.
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Old 21st June 2018, 04:39 PM   #25
diypass is offline diypass
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Originally Posted by lcsaszar View Post
Empirically: hold the capacitor in your hand and touch each lead to the input of an audio amplifier. Higher hum belongs to the outer foil.
could explain in a more precise way ?
thank you
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Old 21st June 2018, 06:34 PM   #26
DF96 is offline DF96  England
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It is difficult to clarify a sentence which already seems extremely clear.

Anyway, for 3.9uF this test is unnecessary. 'Outer foil' is only relevant when the cap has a low enough value that stray capacitance to the outer is not entirely negligible when compared to the cap value. We are speaking nF, not uF.
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Old 21st June 2018, 09:56 PM   #27
diypass is offline diypass
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yes i'm agree, in fact i've tried tp test hum via empirical and is symply identical no change
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Old 29th July 2018, 01:52 PM   #28
ontoaba is offline ontoaba  Indonesia
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they don't usually has an outer foil and cut equally, just connect one lead to the package and it is outer then.
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