Inductor Ringing Using A Square Wave To Measure It's Value
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- Опубліковано 1 сер 2024
- Using the square wave from the oscilloscope probe compensation output to 'ring' a tank circuit to determine the value of an unknown inductor.
This method requires an oscilloscope and square wave generator. The parallel resonant method can be done with an AC voltmeter and the oscilloscope is optional, but it needs a variable sine wave generator.
This is in response to a viewer comment from the 'Measuring Unknown Inductor - Parallel Resonance Method' video where he mentions the 'ringing' method, so I thought I'd show that too.
0:00 Intro
0:08 Circuit Description
0:22 Schematic and Operation
2:26 Oscilloscope Waveform Measurement
3:48 Formula and Calculation
5:02 Square Wave Generation
5:26 Notes On Two Different Methods - Наука та технологія
Stumbled across this video and your channel. Good stuff. Short, simple and to the point information. Subscribed!
Thanks for the comment and the subscription.
Great demo! I used a similar technique back in the 1980s to design an oscillator tank circuit for my video digitizer. I used 555 timer running at a few KHz to pump my tank circuit. I think I used a 22pf capacitor. The inductor was wound on a piece of Bic pen I chopped off. I need 14.318MHz, or 70nS. So I tuned the number of turns until I got the ringing to 70nS. Easy peasy! I then placed that tank circuit in my Colpitts VCO and was good to go.
The art of engineering is building what you need using what you have.
note the inductor itself has capacitance.
therefore this is only 'about'.
repeat with another value cap.
develop the algebra and you can actually get the self capacitance value.
then check against another repeat without any additional cap.
Agreed. A Google search for 'inductor parasitic capacitance' shows some good results.
Excellent: you are coach-able, not true of everyone. cheers. @@MoreThanElectronics
you can also measure the Q of the inductor this way
Yes. Lower Q dampens the ringing voltage quicker. Google "measuring inductor q ringing voltage".
Kind of a problem with the ground lead, as it introduces an inductance in the "loop", but that's at 100-130 MHz, typically... With the "RIng down" waveform, you can also see the inductor's ACR at the ring frequency...by adding capacitance, reducing the frequency, you can measure ACR at several points.
could you kindly use time tracker in marker mode to find out time period of a single sine wave please some where in between 5th - 7th ring.
So, what is the inductor under test marked value - if any?
It has no markings of any kind.
its*
Why on Earth you're counting time with your bare hands on osc? Use cursors, why not?
Because it's quicker and easier???
Not everyone has an oscilloscope with the cursor function.
@@edgeeffect it's not)
@@MoreThanElectronics really?! I thought your osc has. Ok then.
My oscilloscope does have that function, but not all oscilloscopes do.
One of the goals of this channel is to show that you can do interesting and fun things with a minimal amount of equipment.
hmmm it's like you copied somebody else's format... lol
Who were you thinking of?