How to use FFT to measure power supply voltage ripple
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- Опубліковано 3 жов 2024
- Demonstrates how to use an oscilloscope to measure power supply voltage ripple with several methods including FFT.
#1: Siglent SDS1102CML+
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#2: Hantek DSO5102P
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#3: Hantek DSO5072P
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#4: Rigol DS1102E
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#5: Rigol DS1052E
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#6: Siglent SDS1052DL+
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#7: Owon SDS5032E-V
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#8: Uni-T UTD2052CEX
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#9: UTD2025CL
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#10 GW Instek GDS-1102-U
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Hi Eddie,
Great information, thank you.
Liked and subscribed.
Adam, Yorkshire, UK
Thank you! Wow - I’m really happy that I can reach across the pond! Welcome Adam!
Awesome! Thanks for taking time to make this. I keep hearing noise floor - now I know how to 'see' them.
Thanks so much! I have other videos on FFT;) Search Kissanalog FFT
Good job for knowledge Sharing .I had being teaching industrial technician/engineer using electronics tools/equipments for more than 15 years. Many of Master/PhD degree people keep their knowledge as Top Secret and not willing to share out their information. The Fast Fourier Transform (FFT) is one case. Those selfish people judge people that you must have PhD degree in order to understand it .They think they are wasting time to
teach/tell you. Since 25 yrs ago I started to Self-training through Internet ! Whoever ask me anything I know( wether you are Primary School standard ,Secondary School standard) I will answer their curious-mind. This is how the Human Knowledge pass down for generations . Thanks again for information sharing through Internet ! Good job done .
KL Ong Thank you for the nice feedback. I agree with you - so many advanced concepts can at least be understood if simplified and placed at a useful level. We don’t all need to know how to derive a formula to understand how it can be used. A lot of those theoretical folks can not put the knowledge to practice. I found professors who wouldn’t or couldn’t explain how to use the theory in a simple design example. Thanks for your input - much appreciated!
@@KissAnalog My experience is that most MS and PHDs in the engineering world are specialists in a very narrow area of study, they really are useless to general problem solving. I think, they didn't know what to do with their BS degree, they really had no engineering talent, but they were good at being a professional student. So thinking more school would fix the problem they stayed that course. In my experience of university and working career, I've only met one PHD that I thought had talent. He was a generalist.
"The Fast Fourier Transform (FFT) is one case. Those selfish people judge people that you must have PhD degree in order to understand it ."
The FFT is not secret. Many sources explain it in detail. It is not trivial. It may be better to start with DFT (Discrete Fourier Transform) to understand FT at all. Then proceed to discover how the FFT leverages discrete Fourier Transform and why it is dramatically faster.
Short and to the point. Awesome!
Thank you!
You need more multimeters. Lol
Nice video! 👌
learnelectronics Thanks Paul!! I’m honored that you stopped by!
Hi Eddy, great content mate! I'm just starting with my electronics journey while 40 years old. I never had any understanding of electronics, just starting to touch the surface now.
As an enthusiastic audiophyle I challenged myself to create awesome power supplies. Until now I paid big bucks for those famous brand audiophile LPS's to feed my streamers and DAC's, now I want to understand the concept myself and start experimenting by building my own ones. Your content helps me a lot in understanding things and how to bring things in practice. Thanks for that!
Oh, and I have the 1202x-e and I'm trying to find out how to use it to analyze and interprete LPS's, that's how I got here :)
That's great! Let me know if there is a specific video that I can do. Here's one on FFT with the Siglent that you might find interesting: ua-cam.com/video/VSCoAX2aJ2M/v-deo.html
I did a search for FFT and your channel came up. I'm a retired EE. I never did any work with log type measurements, the example you showed on the ripple simulation was very informative. My current task is one with my metal working hobby. I want to use an accelerometer to balance grinding wheels. As even micro imbalance causes surface grinder ripples, as well on the tool post grinder, surface waves. So I want to use the Rigol 1054Z to measure the RMS peak of a 60Hz two pole motor spinning the wheel. I may not be able to fix the problem, but I'll learn something. As usual, the hobby is more fixing the tools, then using them.
I'm glad you found this channel! Sounds like you have an interesting task. Should be possible, and fun working it out. Do you already have the Rigol? Log will help if the signal is comparing or monitoring both small and large values. It helps compress the signal so that the small stuff doesn't get lost in the resolution. Let me know if I can help.
@@KissAnalog I've had the scope for 3 years now. I just got the accelerometers in the mail, so will connect one up and stick it on a motor to see what the signal looks like. Don't know if I will need to use an opamp to amplify or not. Grinder motors are 2 pole so run at 3600RPM minus slip. So effectively signal at 60Hz is the amplitude of interest.
Hello from the UK Eddie, Fault finding is my favourite thing, on another note also I have a Siglent SDS 1102 CNL, having watched this SDS1202X of yours I think I'm gonna have to sell mine & buy one of these, they really are a fantastic machine.
Paul
Welcome! I’m really happy about how I can reach those on the other side of the pond! Thanks for posting this! I’m sure you can help out with great insight.
What a awesome explanation man. Thank you for this video. I somehow missed it going through your back catalog. My hantek has horrible fft haha I find it crazy how the fast Fourier transform math was created over 100 years before oscilloscopes existed.
Thanks Joey! I agree - isn't it crazy how the old stuff is carrying us through these new times with great equipment? BTW, you haven't subscribed;) It is ok if that's not your thing:)
@@KissAnalog it's showing me as subscribed on my end. I joined your patreon so of course I subbed. Lol I'll unsub and resub. I suspect it's an issue on the back end of the software
@@KissAnalog let me know if it worked brother. I subbed you months ago. I heard your channel name on one of Paul's videos because he referred to a dmm teardown you did. I immediately watched and subbed lol
I love Pauls channel;)
@@KissAnalog I texted you today. I hope I didn't step over any boundaries. I wanted to send you some pics of decent budget meters and some garbage 2 dollar ones. Along with different tiers of the cables. You can still purchase all the items on Amazon. I need to make space so the stuff will just rot in a box or you can have them and do what you want with them. There's like 3 completely bottom end ones, 2 50 dollar ones and 1 130 dollar one. Canadian dollars of course. Two of them, the 50 dollar zotek autoranger price varies from 50 to 100 depending who rebranded it and the owon b35t+ ranges from 75 to 150. No strings attached. Just maybe stuff for future comparisons.
Another great video. I was looking up FFT and wouldn't you know it you have a video on it. If you revisit this in the future maybe you could go a little deeper maybe showing crosstalk and filtering for it.
LOL Thanks - I appreciate you;) I do plan to show more FFT work - I got to get on it;) Thanks for the suggestion on crosstalk - that's a great one!
Great video, I've just bought a Siglent 1102X. This video has helped me enormously. I only wish that I could have seen you use more of the controls of the scope. But, it has still helped me. Many thanks'. Graham. Bundaberg.
Thanks so much for your feedback! Here’s another video ua-cam.com/video/RIm3GbVs04w/v-deo.html
great info ....I just have to stop n play....Practice makes Perfect
Micro Fix I appreciate your support! I hope practice helps me make these videos better...
Thank you for such videos, I learn a lot! Great knowledge presented in amazing way.
I’m so glad! Thank you for the great feedback!
Hey there, can you explain that with the help of FFT, how do I read the frequency response of filters/ cutoff frequency, and what this dBV tells us?
Thanks for the great question! I'll do more videos on this subject. It is just such a great subject so I think a lot of examples are needed. You can search - KissAnalog FFT - on UA-cam and you will find my videos on this, but here is a good example: ua-cam.com/video/VSCoAX2aJ2M/v-deo.html
Hi Eddie, cool video, very and lightning. Thanks
I appreciate you!
Does filtering the harmonics make any sense for a power supply? I would like to see it done either way.
Yes it is exactly what you want to do for EMI and to have clean power. You hit the nail on the head! I’ll show how filtering can be compared by looking at the FFT. Awesome question!!! Thanks!
Very enlightening
Thank you!
I measured some FFT with scope I need to return and need to find out by theat if it generates lots of EMI or not, could you assist on that?
Thanks for the question. Sure, can you give me more info?
Do you can make a presentation of filter of DC voltage ripple?
You bet! I’ve been trying to get to that video:) I’ll get there.
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Resultados de traducción
First of all, I hope you are in good health and thank you for this informative video. I have a question: the configuration you have prepared shows the probe set at 10X and the bandwidth limit at 20Mhz.
To measure ripple on a DC power source, is this setting better than the: 1x setting with maximum bandwidth as you show in another video?
Thank you very much and take care !.
yes, I think so... The 1x limits the bandwidth, and can potentially change the signal that you are reading as it can load it. So, I like to use the higher impedance 10x.
@@KissAnalog Thanks so much to take some time to answer me, i really trying hard to get better and trusty results on my FFT measures, all yours videos has been very helpful to me.
could you spend some time on taking some ripple by FFT meassures on a real power supply? i mean someting really noissy like a little cheap phone's charger or a pc powersupply.
Again, thanks so much for all that you have teach us.
Dang, when you want to trigger on a small AC signal riding a large DC signal, that's when you switch trigger coupling to AC. Or in this case just us AC coupling for the signal as well and ignore the 3.3 volt DC.
8:30 Seriously....Were you high on something??
Hi Eddie , for practicing such things I dont want to use my hi voltage amplifiers. Rather something with less than 30V I guess. What do you think of getting a AC variac (250VAC) that will work for my amps project to start them safely etc. Or to get one transformer for example 230/30V AC? Thank you for recommendation ! Jacek
I think that's a great idea. I show a B&K AC power supply in my latest inrush current video. I like to bring up things slowly. ;)
@@KissAnalog aaaa indeed. Just see this repair video. Very nice power supply unit
Hi, is it possible to do such good FFT analysis with Siglent SDS1102CML oscilloscope?
That’s a great question. I looked at the daily sheet and then the user manual to look into this. It looks like it has a lower points count. So it will look OK, but maybe not quite as good. You can focus in on a harmonic and use the resolution that way to get better images
@@KissAnalog Thank you for your answer and great videos! If it's possible, would you think of demonstrate that ;)
A friendly side note: You keep touching the screen. The SDS1202 is not a touch screen. There is NO reason for you to touch it! All you are doing is mucking up the screen with fingerprints...thanks for the FFT vid. I just got the SDS1202-E-X today, AND am using a 3.3v ps with an accelerometer and the scope's FFT for vibration analysis.
LOL You are so right;) But it is a touch screen - it just doesn't react;) How do you like your scope? It sounds like you have a great application.
nahh why not keep it barebone.. and create the scenario a user would meet, and all down to earth.. all this waveform generator and then I will use this waveform and this DC negative offset and this and this. and all this chabang can then symbolize a power supply with some special features
but whatever' likely not the correct video for me.
Looking for videos with scopes, where one is actually taking real-world everyday things and showing the advantages you can use a scope for and basic ABC approach..
Thank you Jacob! Your timing is awesome! I have just started a series of videos that I want to do just that. I’m going to get them shorter and to the point. I’lI have one I am posting today which is a basic calibration and probe compensation video. I thought about this when posting this video: How to measure Harmonic Distortion with Siglent Oscilloscope: ua-cam.com/video/mYhbzYTdsNk/v-deo.html