Methods of measuring an Inductor
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- Опубликовано: 1 дек 2024
- I demonstrate how the value of an inductor can be measured using multimeters and a signal generator. I also show how to measure inductance using a signal generator and an oscilloscope. I demonstrate how to find it 3dB break point of an RL filter which can then be used to find the value of the inductor.
It’s a lot to take in - I will definitely need to rewatch this series of videos to get a better understanding. It’s a great set though, focussing on fundamentals of measuring these components. I see you’ve got a new workroom! Thanks for making these Eddie, very useful and informative.
Thank you Andrew. I realize that I should continue my KISS U series. Short videos that cover the fundamentals in bite size steps - something I can try to do in addition to other series...
I'd like that.
Just a suggestion: Showing a simple line drawing of your setup would be helpful to people trying to understand your setup.
You’re right! I’m working on getting better so feedback like this helps a lot.
You are a very experienced engineer, perhaps you could do a video on how to extract the parameters of an inductor for a wideband spice model, and how the core material effects the inductors performance, specifically saturation as a contributor to amplifier distortion in a Class-D amp.
WOW I learned so much today! :-)
1) An inductior resists DC but not AC?
2) It is important to know how good your test components is, if it deviates from you think it should be.
3) That components can change values and phase, depending on the frequency (also meaning 50Hz ?)
4) That resistance, inductance and capacitance is a part of every component and that's why components do change values when frequency changes.
5) Why more then one multi meter is a great ting to have
6) And ofcause the main subject what you were teaching in this video. :-)
7) Oh and lol yes, that I need a functions generator:-)
I may have a request for you, your going trough the setup is still really great but I was thinking if would be easier if you did a hand drawn diagram over the setup?
Last but not least, I do think that you are making amazing videos and is really good at teaching!
Thanks a lot! I appreciate you!
An inductor "resists" AC, not DC. Inductive reactance = 2πfl. For DC, f=0, so Inductance is zero for DC.
Thank you for the information. I need to know how to measure unknown 3 phase line reactor. My concern is current rating and inductance. Thank you
Thanks for the feedback! If you show me a schematic or part number I think I can show this.
Thank you, Sir for reply. My issue in short, is that I had to connect 300 amp 3 phase line reactor (choke) to VFD inputs, to act as filter or reducing harmonics. The choke I have has no label on it, so I couldn't verify any information like current rating or inductance . There was nothing to lead me to current rating. I would appreciate if you look into similar senario and make a video about it. To identify unknown 3 phase choke. I add a link for you here: ruclips.net/video/o_C9lI-pLMI/видео.htmlsi=HkjAA6axNNY3mLCL
You're smart... This video deserves another theoretic background video.
I was able to follow you because I have slightly the background.
I haven't appreciated yet such a smart procedure on RUclips...
Thanks
Youssef Dirani Thank you! I appreciate hop, and I’m glad that you were able to follow;) Hope to hear more from you.
Great video. I have been trying to determine L of a solenoid dc coil. I have not tried this yet, two meters, but did use a scope and signal generator plus 2 LCR meters and all 3 ways disagree too much. I need to know the inductance for RC snubber design.
Is this something that is ringing at you are trying to correct - or something that you are designing to? I have two different answers depending on how you are approaching this. How much current does the coil need to operate?
I can't believe you don't think showing a schematic diagram is important. Completely necessary from a teaching and clarity of explanation perspective.
Sorry about that. Thanks for your feedback!
Great tutorial Eddie
If possiable could you make a video for understand Noname toroidal core 's ? I mean finding Al value than from sizes other values finding and than what is most effective working frequency and what is saturation frequency etc
for example ferroxcube's or other toroide manufactures product can use and finding values with product catalogue
(If you make this video please draw a test circuits too)
Regards
Thank you for suggesting this! It has been on my mind and now that you bring it up - I think I should do the first video on it. I think there will be more to follow up;)
Thought, if you had a known capacitor in series with the coil and a resistor you do a sweep up with the tone generator and measure where it dives the most, you could well do it parallel too I think.good explanation video, looking forward to more.
Thanks - that's a great visual way to do this. I do plan to do more videos on this subject. Thank you!
Interesting! Thanks for the info
You bet = it’s great to hear from you!
I got lost understanding the connections. I think the FG is across the series resistor and inductor. One DMM across the inductor. CH1 across resistor and FG. CH2 across the resistor. Do I have that right? Can you diagram the setup? I want to reproduce what you have shown.
Brad, I’ll repeat this in a new video and do it differently. I think I’ll actually do a mini series using different combinations of components because I think it would be really helpful as this is so important. Bye the way, I think you have it right!
What I think would be cool is if you used a whreatstone bridge with this configuration. I think the reference leg voltage divider would have to be set at .707 of the supply voltage. This way when the multimeter on the wheatstone bridge read zero you would know the reactance would be equal to the reference resistance.
That’s a great idea - thanks for the feedback!
Great video Eddie,
Am I right in thinking, that multimeters need to be true RMS reading and capable of the bandwidth in an AC voltage measurements for the given frequency of the signal generator ?
ATB Adam
Adam L Thanks Adam! You are right - I need to remember to mention that - very important!
Wow. I didn't think it would take so much to test an inductor. Great video. Ia there a way to test inductor while motherboard circuit?
In circuit testing for inductors can be difficult. Thanks for asking;)
hi sir, can you make a video about how many turn a 100uH?
Yes you bet!! I’ll do that very soon!
WHEN ARE YOU GOING TO TEST THE CLASS AB AMP?
I’m going to get that out probably this weekend:)
Hi, is this method of measuring work for a Speaker Driver? Sometimes, the Thiele small parameters are note available, and the speaker inductor is require to design a crossover. By the way your videos are verry interesting. Thank you.
Have a nice day.
Al.
Hi Al. This would, but I have a spin on it that would make it a better measurement. Using an amplifier with the signal would do the trick. I'm going to do more videos on how to measure inductance/impedance using speakers and crossovers and both combined. My list is long - I just need the time to do it;)
Your technique would be useful when trying to use random toroids in circuits.
That’s a great idea - thanks!
make a vid using a lrc meter.
You gave read my mind;). Thank you for suggesting this!!
You lost me with spaghetti junction. A drawing would have been handier.
Thanks for that feedback. I'm trying to remember this;)
So you basically need 4k dollars to find out the value.🤣
Thanks for your feedback!! No, I think this video shows that you can do if for much less:) Why do you say this? I hope this isn't what I tried to show:)
I have a recommendation that I think I have not seen anybody do before but if I was making a video I would probably do on my math formulas.. I’m very bad at remembering formulas even when they are verbally told to me , I’d learn by site or seen them written down many other people are like this to. If you had a manual for Electronics Math that was available online as a PDF for reference, for your formulas that you could put in a link below or on your video. I’ve noticed in college when taking electronics classes many of the college electronics required books earlier additions were available for free for download online.
That’s a great suggestion! Thank you for the idea!