Hello,
My experience with the USA on this matter is similar to the EU, in how people handle it. USA: It is correct that Part 15C (intentional radiators) only have one emissions limit (15.209), equivalent to Class B. But if the main product is intended for a Class A environment, the manufacturer tends to show that all the emissions associated with the transmitter are under the Class B limit (15.209), and all the emissions which may exceed Class B but meet Class A (15.109) are exclusively from the digital device part. Similarly in the EU; the application of a radio standard (e.g. EN 300 328) typically means that all emissions are handled under the radio standard, and the radiated emissions in EN 301 489-x are therefore not applicable. However, if the product is ‘combined equipment’ (as Charlie described), such as the Bluetooth washing machine idea, then people tend to apply the radio (e.g. EN 300 328) limits to the radio (e.g. Bluetooth) operation and the EN 55014 limits (for example) to the emissions from the operation of the washing (laundry) machine (appliance). Michael. From: Bill Owsley <[email protected]> Sent: 16 September 2019 18:15 To: [email protected] Subject: Re: [PSES] Intentional radiator Class A or Class B My answers for this are USA/FCC centric due to the nature of questions. ps. Canada goes along too. So a composite system would be mutually exclusive; when operating as a Class A unintentional radiator, the BT, BlueTooth? the radio must not operate. Assuming a non-residential environment for the Class A option. And when the radio, BT, is on, the system must comply with the general limits, equivalent to Class B. Trying to convince the TCB otherwise could be challenging. The rest of world regulations are similar but enough different that this would be a different discussion. - Bill On Monday, September 16, 2019, 2:37:47 AM EDT, T.Sato <[email protected] <mailto:[email protected]> > wrote: On Mon, 16 Sep 2019 02:51:17 +0000, [email protected] wrote: > I have a client that design and manufacture products for usein > non-residential environment. This product consists of a BT module. I am > toldthat the product must meet Class B emissions. Is this correct? What if we > putan statement in the user manual stating that this product is not to be > used inresidential market? Would that give us the pass to go to Class A? Can it be considered as a composite system (47 CFR 2.947) that incorporate Class A unintentional radiator and Part 15 intentional radiator? Regards, Tom - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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To post a message to the list, send your e-mail to <[email protected] <mailto:[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://www.ieee-pses.org/list.html (including how to unsubscribe) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected] <mailto:[email protected]> > Mike Cantwell <[email protected] <mailto:[email protected]> > For policy questions, send mail to: Jim Bacher <[email protected] <mailto:[email protected]> > David Heald <[email protected] <mailto:[email protected]> > - ---------------------------------------------------------------- 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://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
