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
Hello Dr. EMC. I have just subscribed your channel. I came to learn in RUclips and I saw this video that was so interesting !! because I am an EMC engineer in the railway project. My role just evaluated or approved the electrical devices which were installed in the railway system for mitigating the EMI risks for assuring the whole system. Based on my experiences, I just knew a bit knowledge from theories or textbooks. It was that meant I never saw this kinds of actual EMC tests according to EN 50121-4 before until I met the channel. Not everybody could have a chance or spend times in the accredited labs like you to familiarize with the EMC apparatus. I appreciate you to create the contents like this more. Thank you. ❤
Sure! The main isssue was that the product has an HDMI interconnect cable and a 90degree RA HDMI plug. I noted that if I plug a display directly to the PC, even without a cover, then the emissions dissapear. That solution would be ideal, but it wasn't possible to actually do that. So the pass was achieved through a combination of: a) better quality HDMI cable, linked below, which removed the harmonics, and b) adding a ferrite clamp, which reduced the fundamental. These fixes are acceptable, because they can easily be implemented in production without a major change in design. A metalwork re-design would require a re-test on the other hand. kabeldirekt-store.de/en/products/hdmi-2-0-kabel-top-series-4k-8k-blau
@@DrEMC-sf8rx Hi Dr. Emc, can you share some knowledge why ferrite clamps work on shielded cable? Besides, why does it only reduces the fundamental frequency 148.5Mhz but not the higher harmonics?
@@TheZoro-ub1zm great question! As you've implied, the problem is that shielded cables are not so shielded after all. Magnetic fields penetrate metals with attenuation and create electric fields that propagate further. So, a thin sheet of metal won't stop strong magnetic fields even if it's reflective for electric fields! Of course, commerical cables are relatively thin, and this is why EM fields exist around them, which are the strongest at their fundamental frequency. ps. You can also watch my other video about EM shielding: ruclips.net/video/4TaFm_Y_E2c/видео.html
Hi. How much did it cost to rent this laboratory? I'm trying to open my own EMC company in Canada. And I would like to get advice on the specification. I see you have a paid course, but I’m not sure if it’s right for me. Good luck
Hi! Thanks for the interest. First of all, this video is about Railway EMC and the course I have is about Radio EMC. The exact specifications depend a lot on the product and it's hard to put down a specific number. On average, the cost of a non-radio product compliance in UK, I think is around £10,000 per product, including the testing time at the facility and the report. If a product is a radio product, the costs tend to double on average. All of the above assumes that the product passes all tests on the first attempt or with very few modifications. The more time you'll spend at the lab, the more it will cost, obviously. My role as of EMC consultant is not to test products at the lab, since each lab provides the unbiased personnel to run the testing. Instead, I focus on helping clients to get their products ready for the tests and help them fix issues that arise during testing, or in other words, to minimize the amount of time my clients spend in the lab. Lastly, my course and the videos on this channel serve only as a brief introduction and an overview of the topic. There's no substitude for practical experience. If you're thinking about starting your own company in this field, I would recommend to find a local test lab in Canada and spend some time working there at least part-time. It will help you to gain more experience and decide if it's right for you. Hope this helps, and good luck to you too!
@DrEMC-sf8rx Опыта работы с СВЧ аппаратурой довольно много. Попробовать на парт тайм устроиться в лабораторию-интересно. Но конкурентов не очень любят)))
@@anatoliilvov8658 своя лаборатория - это многомиллионная инвестиция (стоимость оборудования, помещений, аккредитации и проч.). Вряд ли вы как конкурент. Я по крайней мере для них точно не конкурент))
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
Hello Dr. EMC. I have just subscribed your channel. I came to learn in RUclips and I saw this video that was so interesting !! because I am an EMC engineer in the railway project. My role just evaluated or approved the electrical devices which were installed in the railway system for mitigating the EMI risks for assuring the whole system. Based on my experiences, I just knew a bit knowledge from theories or textbooks. It was that meant I never saw this kinds of actual EMC tests according to EN 50121-4 before until I met the channel. Not everybody could have a chance or spend times in the accredited labs like you to familiarize with the EMC apparatus. I appreciate you to create the contents like this more. Thank you. ❤
Great to hear! Enjoy the channel :)
Can you explain in more detail how you passed the first radiated emissions test? What methods of fixing high-level radiation are acceptable?
Sure! The main isssue was that the product has an HDMI interconnect cable and a 90degree RA HDMI plug. I noted that if I plug a display directly to the PC, even without a cover, then the emissions dissapear. That solution would be ideal, but it wasn't possible to actually do that.
So the pass was achieved through a combination of: a) better quality HDMI cable, linked below, which removed the harmonics, and b) adding a ferrite clamp, which reduced the fundamental.
These fixes are acceptable, because they can easily be implemented in production without a major change in design. A metalwork re-design would require a re-test on the other hand.
kabeldirekt-store.de/en/products/hdmi-2-0-kabel-top-series-4k-8k-blau
@@DrEMC-sf8rx
Hi Dr. Emc, can you share some knowledge why ferrite clamps work on shielded cable? Besides, why does it only reduces the fundamental frequency 148.5Mhz but not the higher harmonics?
@@TheZoro-ub1zm great question! As you've implied, the problem is that shielded cables are not so shielded after all. Magnetic fields penetrate metals with attenuation and create electric fields that propagate further. So, a thin sheet of metal won't stop strong magnetic fields even if it's reflective for electric fields! Of course, commerical cables are relatively thin, and this is why EM fields exist around them, which are the strongest at their fundamental frequency.
ps. You can also watch my other video about EM shielding:
ruclips.net/video/4TaFm_Y_E2c/видео.html
Hi. How much did it cost to rent this laboratory?
I'm trying to open my own EMC company in Canada. And I would like to get advice on the specification. I see you have a paid course, but I’m not sure if it’s right for me. Good luck
Hi! Thanks for the interest. First of all, this video is about Railway EMC and the course I have is about Radio EMC. The exact specifications depend a lot on the product and it's hard to put down a specific number. On average, the cost of a non-radio product compliance in UK, I think is around £10,000 per product, including the testing time at the facility and the report. If a product is a radio product, the costs tend to double on average. All of the above assumes that the product passes all tests on the first attempt or with very few modifications. The more time you'll spend at the lab, the more it will cost, obviously. My role as of EMC consultant is not to test products at the lab, since each lab provides the unbiased personnel to run the testing. Instead, I focus on helping clients to get their products ready for the tests and help them fix issues that arise during testing, or in other words, to minimize the amount of time my clients spend in the lab. Lastly, my course and the videos on this channel serve only as a brief introduction and an overview of the topic. There's no substitude for practical experience. If you're thinking about starting your own company in this field, I would recommend to find a local test lab in Canada and spend some time working there at least part-time. It will help you to gain more experience and decide if it's right for you. Hope this helps, and good luck to you too!
@DrEMC-sf8rx Опыта работы с СВЧ аппаратурой довольно много. Попробовать на парт тайм устроиться в лабораторию-интересно. Но конкурентов не очень любят)))
@@anatoliilvov8658 своя лаборатория - это многомиллионная инвестиция (стоимость оборудования, помещений, аккредитации и проч.).
Вряд ли вы как конкурент. Я по крайней мере для них точно не конкурент))
Test house software is windows xp, I bet the computer is pentium.... unbelievable 😆
why fix something that isn't broken :)