Bad capacitor seen on oscilloscope
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4:13
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You didnt label the axis, shame on you. Now its just an egg on a green screen!
misium 3 months ago
Use a E.S.R. Meter,,,,,It ill be more efficient to test the Quality of the Capacitor.
321reh 4 months ago
It does not say BAD, just O :P
maciejwrotek 5 months ago
@chrystallica Not exactly, this is voltage plotted against current. Different components make different shapes and capacitors happen to make circles because their voltage and current are out of phase charging and discharging. Lissajous patterns are just 2 separate overlayed waveforms on X and Y axis.
KX36 1 year ago
@andymartin86
Also the flat top and bottom is caused by clipping of the mains sine wave. They use the mains transformed down to a lower voltage to generate the 2 test sine waves. If youve ever looked at mains on a scope you will see it usually isnt a perfect sine wave, its clipped. Its this clipping that gives poor shape on the trace
andymartin86 1 year ago
Good capacitors will have a trace that is perfectly upright, once they start to fail they lean over due to the esr increasing, to the point where they become almost flat and open circuit. They also stretch out in the x axis showing they are losing capacitance, higher value caps go towards being a vertical line, smaller value caps are circular.
andymartin86 1 year ago
@mathstatic This type of analysis is one of many used to show distortion or problematic characteristics in a capacitor. The above screen appears to display inherent hysteretic behavior in this capacitor.
Maxzoe20 1 year ago
More information or this video is worthless
mathstatic 1 year ago
Lissajous display can be used to tune or synchronise two or more electronic musical keyboards
ottermill 3 years ago
I think it's a form of signal analysis that looks at the response of the capacitor to a signal of known V (voltage) and f(frequency) and then plots it on the screen as what is known as a "lissajous circle". Notice the ends of the ellipse (not circle) are ragged?? Something is messing with the signal or otherwise not right.
What was this?? Bad filter circuit?? I'm an electronics student.
chrystallica 3 years ago