How To Measure A Capacitor With An Oscilloscope.




What do you think about this video?

Glenn Billings: All in all a good tutorial on capacitors.

One comment.

Quit using all the zeros and switch to Engineering notation.

Engineering notation is a form of Scientific notation based on metric units,
pico, nano, kilo, milli.

If your calculator can not handle Engineering notation, get a new one.

BTW,
Capacitance = Time / Resistance (as you said)

= 50 u seconds / 1 k Ohms

or 50 nano Farads.

The difference between the package label may be the normal variance in
batches of capacitors or also in your measurements of time.

Stan Smith: Those capacitors have polarity and it can be tested to see which is the shielding. Would this change you calcs? did you check the polarity first?

mattleblizz: t is not time, it is "tau" it is one cycle of the capacitors charging/discharging, it takes 5 tau's to get it to lets say 100% (just shy and will never reach) and takes 5 tau to discharge. yes tau is measured in seconds.

JMParsell: Thank you for your kind, intelligent, and inspiring videos.

broderp: Too bad they can't build in this feature into a scope. All is would take is some small switching resistors, a test signal built in and the firmware to have dedicated cursor measuring and readouts.

Afrah Salim: great ^:^

Sebastian Gruber-Kersting: The problem starts with measuring time accurate in the first place. Your scope might provide something like +-30ppm to +-100ppm accuracy from it's Quarz, cause it might not contain an OXCO of some hundrets of Dollar. Next problem is that your resistor might not be one of the higly precise (0.005% Tolerance - 2ppm per C°) type for some hundrets of Dollar per piece as well. Not to mention parasitic & stray capacitance and resistance in your setup caused by probes and else. Any capacitor charging while measured by inaccurate time and also inaccurate input resistance will not allow to create any result of reasonable precision. But at least the principle is very correct and well explained. Well done! Perhaps you try at least some precision resistors of 0,1% tolerance to it's value for the charging. By the way oscilloscopes are very bad devices for measuring DC in general!

Birdman: Is the resistor and the function generator necessary to test a capacitor? Why can't just touching the probes to the capacitors polarized leads do the job?

Michael Jordan: Brilliant!

War Planner: Mr Lorton, I echo the compliments on this video. Would hasten to point out that those attempting to this on a scope without cursors are royally screwed!

But then again, the killer is determining the "e level" or the 62.3% point.

But great kudos for showing us this method and your "failures" as well.

Faidul Islam: your hand paper text, print can't show

FOLLOWTHEROAD: I am sure someone must have mentioned this but I have not seen it so here goes: When using very large or very small numbers such as you are doing here it is very useful to use exponential notation. It will save a lot of errors counting zeros and decimal points. Just my pico-cents. Cheers

alex castro: two questions,,,,,1.- you can check te capacitance only whit internal resistence the function generator (50 ohms) or is necesari add the other resistor? 2.- test the any capacitance whit same frecuence? or the frecuence change whit diferent capacitance for test?

Abdullah Albishri: i'm a computer engineer and i found this videos very useful for me ,thanks for illustration .

Denis Francoeur: The resistor value that you used is a 10 Megohm not a 1Megohm, that is why you have an error, look at your video you'll note that the colors stripe are Brown, Black, Blue

offgridpower: You're a brilliant teacher, thanks for sharing your knowledge with everyone.

Imad Jawad: Thanks Martin:)

Caveman Al Toraboran: 3:25 freaking video finally starts here.

Caveman Al Toraboran: Dude you talk too much freaks sake. Great video otherwise.

EMT: Thanks! They sometimes skip corners and take the easy way. If they ever did that, I suggest you consult with a paralegal or lawyer. This way they won't be able to cheat you.
Rating:
How to measure a capacitor with an oscilloscope. 5 out of 5

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How to measure a capacitor with an oscilloscope.