GR-63-core, section 5.6.4 appears to assume that the worst case noise emission would be a max fan speed. Although this may be the case in most situations, it may not be true in all cases. I would recommend that a pre-scan with a Sound Pressure Level meter be used to determine the maximum SPL and use that fan speed to measure the SPL for the equipment location per Table 4-13 (R4-96). Also, Document the fan speed and the reason for testing at that particular speed. Regards, John Shinn, Ph.D., P.E. (Retired) Occasional Consultant Now, back to my Martini ________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of Marko Radojicic Sent: Thursday, August 26, 2010 5:29 PM To: Sundstrom, Michael; [email protected] Subject: Re: [PSES] GR-63-CORE Acoustic Testing John, The standard specifies in R4-96: " Maximum acoustic level that occurs between 23°C and 27°C should be measured (see Section 5.6, “Acoustical Measurement Methodology,” for clarification." Seems straight-forward and unambiguous or am I missing your question? Cheers, Marko ________________________________ From: "Sundstrom, Michael" <[email protected]> To: [email protected] Sent: Thu, August 26, 2010 11:37:33 AM Subject: Re: [PSES] GR-63-CORE Acoustic Testing I would not assume full speed is the worst case noise. Michael Sundstrom OHD / TREQ Dallas Electronic Lab Analyst, EMC Lead 2170 French Settelment Rd, Suite B Dallas, Texas 75212 (214) 579 6312 KB5UKT From: John McAuley [mailto:[email protected]] Sent: Thursday, August 26, 2010 1:28 PM To: [email protected] Subject: [PSES] GR-63-CORE Acoustic Testing Dear Group In respect of GR-63-CORE acoustic testing on a product with variable speed fans (dependent on temperature), is it necessary to ensure that the fans are running at full speed and therefore maximum acoustic levels? Many Thanks John McAuley www.cei.ie [email protected] ***************************************************************** DISCLAIMER: The information contained in this e-mail may be confidential and is intended solely for the use of the named addressee. Access, copying or re-use of the e-mail or any information contained therein by any other person is not authorised. If you are not the intended recipient please notify us immediately by returning the e-mail to the originator ________________________________ - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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]> - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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]> - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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]> - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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]>
