I agree that it's not clear what it covers (hence the OP), and additional comment/guidance in new standard would be useful.
Clause 4.1 of EN 50371 states: "If the average power emitted by apparatus operating in the frequency band 10 MHz - 300 GHz is less than or equal to 20 mW and the transmitting peak power is less than 20 W then the product is deemed to comply with the basic restrictions without testing" Only intentional transmitters would operate in a frequency band - examples of typical devices covered by this standard would include be Bluetooth and WiFi devices. The "unwritten" alternative doesn't have to be specified as the unit will transmit via the internal antenna and there's no need to instruct the end user on suitable antennas that may be used. Whilst EN62311 covers intentional transmitters above 20mW average, it does not include all those transmitters covered by product family specs. Regards Charlie From: Robert Heller [mailto:[email protected]] Sent: 22 July 2009 12:16 To: [email protected] Subject: Re: [PSES] EN50371:2002 You are probably right, but in my mind it is still not clear and I don't think you can talk about "unwritten" and "implying" as a truth. It always bothers me when a standard which obviously can be clear is not. Perhaps its replacement, 62479, will be clearer. The other generic standard, 62311, is very clear and 62311 deals with equipment with power much greater the 20 mW and it still applies to non-intentional radiators. Bob Heller 3M EMC Laboratory, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 ============================================================== "Charlie Blackham" <charlie@dheanisu To lis.com> <[email protected]> <[email protected]> 07/22/2009 05:48 cc AM Subject RE: [PSES] EN50371:2002 Please respond to <Charlie@dheanisu lis.com> Rob I believe that EN 50371 is only applicable to intentional transmitters. EN 50371 is applicable from 10 MHz, but EN 62311 is applicable from 0 Hz. Section 5.2 of EN 50371 discusses how to test "....transmitters intended for use with external antennas....." - the unwritten alternative being transmitters with integral antenna. There's also a big frequency range where radiating 20mW average / 20W peak is going to fail class A/B emissions limits by some margin - implying product would be covered by RF spectrum spec. Regards Charlie From: Robert Heller [mailto:[email protected]] Sent: 22 July 2009 11:00 To: [email protected] Subject: Re: [PSES] EN50371:2002 Steve, as you are aware, the standard 50371 is a generic EMF standard which covers equipment not covered by a product or product-family standard (whose power does not exceed 20 mW). The product standards that I am aware of cover EAS, RFID, household appliances, mobile phones, wireless networks, basestation transmitters, and AC transmission lines. Equipment that may fall into the low-power standard could be localized TV transmitters or wireless microphones. The standard is not clear but I believe it applies to both intentional and non-intentional radiators. There is a "companion" generic standard, EN 62311:2008, that covers equipment not covered by 50371 (i.e., equipment greater than 20 mW) and it clearly states on page 5, "This standard is intended to cover both intentional and non-intentional radiators". EN 50373:2004 will be replaced by EN 62479 whose FDIS is expected to be issued this fall. EN 62311:2008 has replaced EN 50392:2004. Bob Heller 3M EMC Laboratory, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 ============================================================ "Steve O'Steen" <Steve.OSteen@ac stestlab.com> To Sent by: <[email protected]> [email protected] cc g Subject EN50371:2002 07/21/2009 12:55 PM All, Those of you who have access to this standard or are already familiar with this standard, I would like to know what type of equipment would this be applicable? Is this intended for all devices or only those with an intentional radiator? This is a harmonized standard for the LV Directive as well as the R&TTE Directive. I’ve got my opinion regarding the applicability of this standard but I would appreciate input from others. Thanks in advance, Steve O'Steen Director, EMC Advanced Compliance Solutions, Inc. 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