Guillaume- I assume that the "product" and the "sensors" must work together to be useful. That is, the "product" by itself is not useful equipment, and the "sensors" by themselves are not useful equipment.
In this case, you have an "EUT comprising several units". This case is addressed in section 7.7 of IEC 61000-4-6 (2008). If the product and the sensors are always connected by short cables (1 meter or less), then the product and sensors are one EUT and no immunity testing need be done on the interconnecting cable. On the other hand, if the connecting cable can be longer than 1 meter, then the "product" and "sensors" are treated and tested as separate EUTs. But for cable less than 1 meter long and cables more than 1 meter long, the "product" and "sensors" need to be placed together as close as possible without making contact. Given this, it makes sense to me that for the case where the cable can be longer than 1 meter, both the "product" and the "sensors" need be decoupled from the cable simultaneously. Then the cable is auxiliary equipment. But neither the product nor the sensors are auxiliary equipment. There may be an exception: The case where the sensors are always distant from the product. In this case, I think it would make more sense to NOT place the sensors and product close together. In this case, I think it would make more sense for the sensors to be auxiliary equipment to the product, and the product be auxiliary equipment to the sensors. Cheers, Donald Borowski EMC Compliance Engineer Schweitzer Engineering Laboratories Pullman, Washington, USA From: [email protected] To: [email protected] Date: 07/05/2013 06:47 AM Subject: EMC test 61000-4-6 Sent by: [email protected] Hi everyone, I'm new on this list and it's my first message. I have a question about the 61000-4-6 test and the EUT set-up. If i have a product with several board inside and for example two sensors connected to them. It's a little bit confused in my mind. EUT and sensors are considered as auxiliary equipments ? or is it one EUT with several units ? How is realized the decoupling on the cable between the board and the sensor ? Regards, Guillaume - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
