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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, 09:39 AM   #1
diypass is offline diypass
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Default Outer foil cap measurement with Hantek 6022BE

hi guys,
excuse for this newbe question, but would know if is possible and how to measure which is the lead of outer foil in caps.
this for case study homework
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Old 20th June 2018, 11:56 AM   #2
lcsaszar is offline lcsaszar  Hungary
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Measure: wrap around some kitchen aluminium foil and measure capacitance between the foil and each ends. Higher measured vaue belongs to the outer foil.
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.
Measure empirically: connect an oscilloscope probe to each leads. Touch the capacitor body with your finger. Higher mains AC signal belongs to the outer foil.
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Old 20th June 2018, 12:18 PM   #3
diypass is offline diypass
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Quote:
Originally Posted by lcsaszar View Post
Measure: wrap around some kitchen aluminium foil and measure capacitance between the foil and each ends. Higher measured vaue belongs to the outer foil.
isn't a portable oscilloscope
Quote:
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.
intresting, i'll try it, but i want test with oscilloscope
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Originally Posted by lcsaszar View Post
Measure empirically: connect an oscilloscope probe to each leads. Touch the capacitor body with your finger. Higher mains AC signal belongs to the outer foil.
don't change nothing with none of my caps....probably my hantek 6022be needs to configured for this type of testing, i hope someone helps me
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Old 20th June 2018, 01:24 PM   #4
lcsaszar is offline lcsaszar  Hungary
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What if you connect the other lead to the GND of the probe? I will try it myself at home. But outer foil is usually marked on wrapped foil capacitors, and the only reason I can imagine is susceptibility to stray electric field (outer foil should be connected to lower impedance point in the circuit: e.g. signal source, GND, in order not to pick up any noise). A test should also be based on this.
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Old 20th June 2018, 01:27 PM   #5
Soundhappy is offline Soundhappy  France
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Look at video of film capacitors tests with oscilloscope

Are Your Capacitors Installed Backwards? Build this and find out

and quick test with amplifier

Tone/coupling cap outer foil test - THE EASIEST WAY.

Have a nice day
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class A amplifiers with full range speakers
sings like angels in heaven
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Old 20th June 2018, 01:36 PM   #6
DF96 is offline DF96  England
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Quote:
Originally Posted by lcsaszar
Measure empirically: connect an oscilloscope probe to each leads. Touch the capacitor body with your finger. Higher mains AC signal belongs to the outer foil.
For this to work you need the input impedance of the oscilloscope to be similar or smaller in magnitude than the reactance of the capacitor at 50/60Hz. A high impedance input will not show any difference.
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Old 20th June 2018, 02:14 PM   #7
diypass is offline diypass
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Quote:
Originally Posted by lcsaszar View Post
What if you connect the other lead to the GND of the probe? I will try it myself at home. But outer foil is usually marked on wrapped foil capacitors, and the only reason I can imagine is susceptibility to stray electric field (outer foil should be connected to lower impedance point in the circuit: e.g. signal source, GND, in order not to pick up any noise). A test should also be based on this.
none values don't change also.
probably i'm newbe and a scheme of the procedure anche settings would be better then 1000 words
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Old 20th June 2018, 02:19 PM   #8
diypass is offline diypass
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Quote:
Originally Posted by Soundhappy View Post
Look at video of film capacitors tests with oscilloscope

Are Your Capacitors Installed Backwards? Build this and find out
too complicated for me

Quote:
Originally Posted by Soundhappy View Post
and quick test with amplifier

Tone/coupling cap outer foil test - THE EASIEST WAY.

Have a nice day
i don't have guitar amplifier, i'm not just a lucky man
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Old 20th June 2018, 02:20 PM   #9
diypass is offline diypass
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Originally Posted by DF96 View Post
For this to work you need the input impedance of the oscilloscope to be similar or smaller in magnitude than the reactance of the capacitor at 50/60Hz. A high impedance input will not show any difference.
here mine:
Qingdao Hantek Electronic Co., Ltd.
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Old 20th June 2018, 02:28 PM   #10
DF96 is offline DF96  England
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Input impedance is 1M. The capacitor would need to be less than around 5nF for the test to work.
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