Hello Mark >>Jan, What intended system configuration does your company plan on marketing. >>
This question came up, because we thought we bought a GOLDEN EMC PC for testing our devices. But during the initial EMC emission test we found that even with a open end USB cable or with a USB device the PC set-up was over the EN 55022 limits. >>Ifthe intended configuration of the system is with a mouse then test it with the mouse. If your company plans to package the device with other USB peripherals then you must establish the worst case condition during pre-compliance scans and test accordingly for your final compliance test. You have no control over how the end-user is configuring the system, you should base your test configuration on your companies intention of marketing the device. If you sell many system configurations (multiple mother boards, processor speeds. etc.) with multiple peripherals you may want a final test report for each possible configuration. Example: Our systems have USB capabilities, on one of our systems (not a PC but does utilize a mother board) is intended to be marketed and packaged with a USB mouse and USB keyboard only. We will never ship any other configuration or USB peripheral with this system, so that makes it easy. My test configuration will consist of the base system, USB keyboard, USB mouse, RS232 serial port, parallel port and video port. This system will be our only intended configuration. How our customer configures the system I can not control, the user manual reflects the intended configuration our company is selling/marketing. Naturally if this configuration changes i.e. mother board, peripheral device, monitor, etc. for any reason then testing must be performed once again to reflect out market intentions and configuration sold. >> But in case of a USB keyboard there in NO communication during the EMC test or dou you have a automaic hand whichs does typing for you ;-) >>>This is only my opinion on how would conduct my assessment for emissions testing. Regards, Mark Schmidt X-Rite Incorporated Grandville, MI U.S.A. [email protected] phone - 257 2469 >>> We developed USB Camera's and we must test them with a desk top PC configuration. If we could find a Golden EMC PC we would be happy. Thanks in advance. Jan Mobers --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
