If you found this video useful, please check out my new "Practical EMC for IoT Designers" video course. This comprehensive course contains over 10 hours of video material that cover every aspect of EMC testing for intentional transmitters in accordance with Radio Equipment Directive (RED), ETSI, ITU-R, and EN standards. Apply "RF50" discount code for a 50% off during limited promotion this year only. Don't miss out! www.pcbforemc.com/courses
When are you planning to release your course on Udemy? I would be really interested. Always thankful for your content. In order to become an EMC/RF expert like you, would you please make a video explaining the steps in detail? I would love to learn about your past experiences and the resources you used to be where you are today?
Hi Hwansu, thank you for your interest in the course and the kind words! :) I had to switch my focus to my PhD and I don't want to release something that I'm not 100% satisfied with. But it will be ready soon. As per your other question, I think the most important thing is to simply get involved. There are so many RF/EMC problems out there, it's mind blowing. Companies will quite happily provide the tools and training to anyone who simply shows interest to solve some of them. At least that's what I've been doing, and I'm still constanly learning at a fast pace :)
I've been dealing with high frequency interference from my plasma cutter to my CNC machine. I tried a few tricks that helped. I put the plasma cutter inside an old refrigerator and drill the hole in it to send the leads through. Then I wrapped the torch lead with tin foil. And the wires running to the motors I also wrapped in tin foil and some copper tape. I grounded the z-axis plate nearest the torch do the body of the power supply inside the control box where the control board is. All of this helped but whenever the plasma torch runs for more than a minute my laptop freaks out. Now I have to figure out a way to build some sort of metal cage around my laptop. Any advice?
I've been dealing with high frequency interference from my plasma cutter to my CNC machine. I tried a few tricks that helped. I put the plasma cutter inside an old refrigerator and drill the hole in it to send the leads through. Then I wrapped the torch lead with tin foil. And the wires running to the motors I also wrapped in tin foil and some copper tape. I grounded the z-axis plate nearest the torch do the body of the power supply inside the control box where the control board is. All of this helped but whenever the plasma torch runs for more than a minute my laptop freaks out. Now I have to figure out a way to build some sort of metal cage around my laptop. Any advice?
Hmm, does the interference still occur when a laptop is powered from a battery supply rather than mains? Also, is the laptop connected to the plasma cutter in any way, i.e. RS232 or Ethernet? I'd expect a plasma cutter to produce a lot of conducted emssions, but not as much radiated.
@@DrEMC-sf8rxI've tried it both ways, connected to power supply and running only off battery. The laptop is connected to the control board of the CNC machine via USB. I've tried running a ground wire from the z axis mechanism to the plasma cutter case. That didn't seem to help. Then I ran a ground wire from the z-axis mechanism to the case of the power supply next to the control board. That seems to help a little. Most people connect their control boards to older computers with metal cases via the parallel port. But I use a cheaper card (similar to an Arduino) and it doesn't have a parallel port option. Using an older computer with a metal case and a parallel port seems to be a key factor in reducing HF interference. It is also recommended to ground the cutting table itself to an outside ground rod. I haven't tried that yet. I recently picked up an optiplex 960 which is an older computer tower with a metal case. I also picked up a shielded USB cable to run to the board. I should get a chance to test out the new setup in the next day or two. From what I understand the torch lead from a plasma cutter acts as a large HF antenna. I'm thinking about buying some Faraday fabric and using it to shroud the work lead.
@@roberthosking7524 I think it's a lot simpler than you think. The interference is most likely conducting via the USB port that you mentioned. Try a USB isolator, such as this one - it should fix the problem :) hifimediy.com/product/usb-isolator/
@@DrEMC-sf8rx great - I'll get back to you after testing and let you know how it worked. Thanks. I think you might be correct on this. When the machine was freaking out the laptop it was chiming with a connect and disconnect USB sound.
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If you found this video useful, please check out my new "Practical EMC for IoT Designers" video course. This comprehensive course contains over 10 hours of video material that cover every aspect of EMC testing for intentional transmitters in accordance with Radio Equipment Directive (RED), ETSI, ITU-R, and EN standards. Apply "RF50" discount code for a 50% off during limited promotion this year only. Don't miss out!
www.pcbforemc.com/courses
When are you planning to release your course on Udemy? I would be really interested. Always thankful for your content. In order to become an EMC/RF expert like you, would you please make a video explaining the steps in detail? I would love to learn about your past experiences and the resources you used to be where you are today?
Hi Hwansu, thank you for your interest in the course and the kind words! :)
I had to switch my focus to my PhD and I don't want to release something that I'm not 100% satisfied with. But it will be ready soon.
As per your other question, I think the most important thing is to simply get involved. There are so many RF/EMC problems out there, it's mind blowing. Companies will quite happily provide the tools and training to anyone who simply shows interest to solve some of them. At least that's what I've been doing, and I'm still constanly learning at a fast pace :)
I've been dealing with high frequency interference from my plasma cutter to my CNC machine. I tried a few tricks that helped. I put the plasma cutter inside an old refrigerator and drill the hole in it to send the leads through. Then I wrapped the torch lead with tin foil. And the wires running to the motors I also wrapped in tin foil and some copper tape. I grounded the z-axis plate nearest the torch do the body of the power supply inside the control box where the control board is. All of this helped but whenever the plasma torch runs for more than a minute my laptop freaks out. Now I have to figure out a way to build some sort of metal cage around my laptop. Any advice?
I've been dealing with high frequency interference from my plasma cutter to my CNC machine. I tried a few tricks that helped. I put the plasma cutter inside an old refrigerator and drill the hole in it to send the leads through. Then I wrapped the torch lead with tin foil. And the wires running to the motors I also wrapped in tin foil and some copper tape. I grounded the z-axis plate nearest the torch do the body of the power supply inside the control box where the control board is. All of this helped but whenever the plasma torch runs for more than a minute my laptop freaks out. Now I have to figure out a way to build some sort of metal cage around my laptop. Any advice?
Hmm, does the interference still occur when a laptop is powered from a battery supply rather than mains? Also, is the laptop connected to the plasma cutter in any way, i.e. RS232 or Ethernet? I'd expect a plasma cutter to produce a lot of conducted emssions, but not as much radiated.
@@DrEMC-sf8rxI've tried it both ways, connected to power supply and running only off battery. The laptop is connected to the control board of the CNC machine via USB. I've tried running a ground wire from the z axis mechanism to the plasma cutter case. That didn't seem to help. Then I ran a ground wire from the z-axis mechanism to the case of the power supply next to the control board. That seems to help a little. Most people connect their control boards to older computers with metal cases via the parallel port. But I use a cheaper card (similar to an Arduino) and it doesn't have a parallel port option. Using an older computer with a metal case and a parallel port seems to be a key factor in reducing HF interference. It is also recommended to ground the cutting table itself to an outside ground rod. I haven't tried that yet. I recently picked up an optiplex 960 which is an older computer tower with a metal case. I also picked up a shielded USB cable to run to the board. I should get a chance to test out the new setup in the next day or two. From what I understand the torch lead from a plasma cutter acts as a large HF antenna. I'm thinking about buying some Faraday fabric and using it to shroud the work lead.
@@roberthosking7524 I think it's a lot simpler than you think. The interference is most likely conducting via the USB port that you mentioned. Try a USB isolator, such as this one - it should fix the problem :)
hifimediy.com/product/usb-isolator/
@@DrEMC-sf8rx great - I'll get back to you after testing and let you know how it worked. Thanks. I think you might be correct on this. When the machine was freaking out the laptop it was chiming with a connect and disconnect USB sound.
@@Hollywood4Fun yes, please do! It's always fun to debug these :)