Demonstration of the relative effectiveness of various materials for shielding a 10 kHz magnetic field.
Пікірлер: 66
@EfieldHfield_3776 ай бұрын
Thank you, Ive been at this a long time and still learning. I expected the first steel plate to have a far more dramatic effect. And if I were EMC debugging I would have thought this trough for any piece of steel - I learned today steel can be anything - so something for me to be aware of. Thx for sharing.
@georgedl84842 жыл бұрын
Спасибо за видео, добрый человек! Здоровья и успехов.
@patricko.52774 жыл бұрын
This is a very nice demonstration of magnetic field behaviour! Please keep on going with such kind of videos. Thank You.
@Ronaldolacerda13 жыл бұрын
Boa demonstração nesse video High-Frequency Magnetic Field Shielding Demonstration ( Ronaldo Lacerda Diadema )
@BGLENN-dp4tx4 жыл бұрын
I'd love to see the same video but using 10 Mhz and, of course, coils designed for the higher frequency. Interesting video. Thank you.
@tezlallc29004 жыл бұрын
It would be interesting to talk about the loading effect upon the driver with these high frequency and low frequency experiments :)
@brianmcginnis7417Күн бұрын
I would be interested to see how a sheet of bismuth sheilds high frequency vs low frequency.
@DrScientistSounds4 жыл бұрын
I learn a lot from this channel, thank you!
@thepresident2781 Жыл бұрын
I suspect the plates leave a small gap around the coils and we don't get a complete attenuation. I wonder how much it would change if the plates were slightly larger.
@user-xj8cr8jf9i4 жыл бұрын
good Demonstration ! if you can share the Electric Field Shielding Demostration,that is perfect!
@prjk73393 жыл бұрын
Now i think i understand why we should place telecomunication cables in difrent metal cable tray than power cables (low frequency emf) and why communication cables have copper shielding (hf emf). But still dont understand shielding grounding of telecommunication cables (should it be at one end or both ends). Can you make presentation with shielding plate grounding for high and low frequencies? please please please please please please @LearnEMC :) but wonder where to ground this shielding..
@Learnelectronics7384 жыл бұрын
Hello brother Ilike your video thank you very much
@philidorblackmmar79103 жыл бұрын
it is possible to shield a home against electromagnetic pulse?
@chadpeyton67843 жыл бұрын
Please repeat the low/high frequency experiment, but this time connect the oscilloscope's second channel directly to the waveform generator input into the transmitting coil. Now compare the phase difference between the transmitting and receiving coil, or channel 1 and 2.
@alexlewin99972 жыл бұрын
If the coils were separated by a known distsnce it should be possible to measure the speed of propagation of the magnetic field by doing this experiment. Have you or anyone else ever measured this?
@jaysunkreuze14662 жыл бұрын
If I'm not mistaken, silver is a higher conductor than copper. Would be interesting to see the effect.
@5ty717 Жыл бұрын
At~ 7.14 you say “high permeability encourages the EMF to penetrate the material” attenuator yet permeability of free space is ideal, close or at zero… am i wrong?
@csul59614 жыл бұрын
been trying to find a video for EMF sheilding a circuit breaker panel in my bedroom. can this be done and how? thanks
@SuperArchi20109 ай бұрын
How are you doing I wonder if you could tell How do you detect EM Radiation Thank you
@azadbabayev29834 жыл бұрын
What about trying combination of them at once - like mu-metal along with copper? Will it shield further or not?
@lewissmith20022 жыл бұрын
yes
@NGPerez2473 жыл бұрын
Put a coil of copper between the coils and see what the drop off is when compared to just sheets of copper. Is there a mass correlation here? A correlation to the number of turns?
@LearnEMC3 жыл бұрын
Excellent suggestion! We have not done this, but would expect a single-turn loop to be very effective if it were sized similar to the coils.
@louisnguyen28654 жыл бұрын
Great and helpful. Can you do one for a titanium plate, see if there is any shielding?
@LearnEMC3 жыл бұрын
At high frequencies, yes, because titanium is a good conductor. At very low frequencies, no, because titanium is not magnetic.
@astrohimseIf3 жыл бұрын
Great video! Can you please give any advice for properly shielding PC? What i understood from those 2 videos is that you probably need some universald metal to be safe from both high and low frequencys, so what do you think would be a good choice for practical use?
@LearnEMC3 жыл бұрын
You probably don't need to shield for low-frequency magnetic fields, so almost any metal would be the appropriate material choice. If (for some reason) you also need need to shield low-frequency magnetic fields, any steel that a magnet will stick too can be used to redirect those fields.
@trandafirmarius35053 жыл бұрын
What is the output power(mA) of the signal generator?
@jaysunkreuze14662 жыл бұрын
What material would be best to block 25-100gHz?
@CzlowiekNapinka3 жыл бұрын
Thank you for this video! How effective is ~30um thick copper plane in PCB at typical SMPS frequencies (0.4-2.2MHz)?
@LearnEMC3 жыл бұрын
Very effective at 2.2 MHz, where the skin depth is 18 um. A little less effective a 0.4 MHz where the skin depth is 42 um.
@CzlowiekNapinka3 жыл бұрын
@@LearnEMC Thanks for you response. And thank you very much for all the resources you share on your site. I wish I could afford your courses!
@levijessegonzalez36293 жыл бұрын
im about to prime the entire inside of my new home. Do you think adding activated charcoal to the primer (then doing another coat of regular primer, then paint.) be good for emf?
@LearnEMC3 жыл бұрын
No. That is unlikely to make any measurable difference.
@targeted98 Жыл бұрын
what about lead
@indulgence88603 жыл бұрын
How do you feel about cancer and emf fields being pointed at humans over long periods of time.horrible attachment or passed through minus the temperature just strong emf fields like a subwoofer vs how the exact amp and real reading the directed current being shot In ones direction. Danger levels?
@azadbabayev29834 жыл бұрын
Does grounding affect magnetic field blocking or lessening the strength of magnetic field - both low and high frequency fields?
@palesazozi7934 жыл бұрын
Not significantly
@yt4krist0f3 жыл бұрын
Would it be any difference if the shielding was a) built as a box/cage around the coil and/or b) if the shield itself was grounded?
@LearnEMC3 жыл бұрын
The conductive materials would work better around the whole coil, the non-conductive materials still wouldn't work. Grounding makes no difference.
@yt4krist0f3 жыл бұрын
@@LearnEMC Thanks! Then these guitar shieldings also shouldn't be grounded at all in theory? kzfaq.info/get/bejne/qsmIqLmJ16ncmZs.html
@rishabbajaj93713 жыл бұрын
Sir can you please tell something about your 10khz sinewave generator. I have been trying different oscillator but none of them are stable.
@LearnEMC3 жыл бұрын
It was a Rigol waveform generator.
@BrentLeVasseur2 жыл бұрын
Try Bismuth.
@LeftoverWhiskey133 жыл бұрын
Would a mesh sheet have the same attenuating effect?
@LearnEMC3 жыл бұрын
Yes, to the extent that it allows the free flow of the eddy currents.
@mindrichentertainment36673 жыл бұрын
Intro Killed me haaaaaaaaa
@alexabadi74583 жыл бұрын
I noticed a magnetic field polarity reversal at about 800K hz, any explanation ?
@LearnEMC3 жыл бұрын
You would have to describe your test set-up before we could offer a definitive explanation. However, a 180-degree phase shift would occur if you passed through a resonance and the coupling changed from inductive to capacitive.
@alexabadi74583 жыл бұрын
@@LearnEMC That give me a field to explore to find my explanation, thank you very much for your response.
@inkognito92653 жыл бұрын
Hi,what's about titanium¿ does it shield¿¿
@LearnEMC3 жыл бұрын
High frequencies, yes. Low-frequency magnetic fields, no. Titanium is conductive, but not magnetic.
@inkognito92653 жыл бұрын
@@LearnEMC thank you.
@kireetsharma49333 жыл бұрын
LearnEMC, I've a cell phone app, which is showing that I've magnetic field upto 135 micro tesla, would that be high frequency, or low frequency? What kind of a material would be best for shielding, I need to shield an entire room.
@LearnEMC3 жыл бұрын
That is likely to be the earth's magnetic field. No need for shielding.
@kireetsharma49333 жыл бұрын
@@LearnEMC It's some kind of a weapon, normal reading is around 25 microtesla on my meter, when this weapon gets turned on it causes headache, tooth aches, and problems breathing. I'm a Diplomat, and it's a weapon being used against us.
@xiaosun91113 жыл бұрын
what about MHz?
@LearnEMC3 жыл бұрын
The magnetic field is blocked by eddy currents at MHz and GHz frequencies also.
@xiaosun91113 жыл бұрын
@@LearnEMC thanks for the feedback! we have a product (VFD+PMSM Motor) with aluminum housing that is over the limits in about 30MHz to 100MHz range, it seems that metal housing can't surpress high frequency noise completely?
@LearnEMC3 жыл бұрын
@@xiaosun9111 You don't have a magnetic field shielding issue. Your emissions are due to the common-mode currents induced on the cables.
@xiaosun91113 жыл бұрын
@@LearnEMC oh, thanks, can i solve the problem by using a ferrite core aroung the cable?
@LearnEMC3 жыл бұрын
@@xiaosun9111 EMC problems with motor drives are best handled by proper design. That's not something can be done via KZfaq comments. I'd recommend you seek advice from someone who can review your current design.