nominal dimension
Definition Approximate or roughcut dimension by which a material is generally called or sold in trade, but which differs from the actual dimension. In lumber trade, for example, a finished (dressed) 'two by four' piece is less than 2 inches thick and less than 4 inches wide. Also called nominal size. “ but which differs from the actual dimension” Mcgrawhill: (design engineering) Size used for purposes of general identification; the actual size of a part will be approximately the same as the nominal size but need not be exactly the same; for example, a rod may be referred to as ¼ inch, although the actual dimension on the drawing is 0.2495 inch, and in this case ¼ inch is the nominal size. IMHO it relates to identification of the size within a number of defined classes, such a lumber standard sizes, and or clothing sizes. As there are no classes of table sizes, this word is misused here. Any table will do. The normative aspect as EUT size and height. BTW the inaccuracy of the sizes is also omitted. In the absence of definition, usage is 50% of least relevant digit. Interpreted this way the table length may be 0.50 to 1m5 in one size and 1m45 to 1m55 in the other. The table height must be within 79.5 and 80.5 Regards, Ing. Gert Gremmen [email protected] www.cetest.nl Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 Before printing, think about the environment. ________________________________ Read more: http://www.answers.com/topic/nominal-size#ixzz1aUzLeYzu <http://www.answers.com/topic/nominal-size#ixzz1aUzLeYzu> Van: [email protected] [mailto:[email protected]] Namens Dennis Ward Verzonden: dinsdag 11 oktober 2011 18:44 Aan: 'Grace Lin'; 'WNya' CC: 'EMC-PSTC' Onderwerp: RE: Table Size in Emissions test Both ANSI C63.10 and ANSI C63.4, the typical standards for which ISO17025 accreditation is used, contain the following statement, “Tabletop devices shall be placed on a nonconducting platform, of nominal size 1 m by 1.5 m, raised 80 cm above the reference ground plane. While a bit more open to variation due to size of equipment, CISPR 22 has the statement “Equipment intended for tabletop use shall be placed on a non-conductive table. The size of the table will nominally be 1,5 m × 1,0 m but may ultimately be dependent on the horizontal dimensions of EUT. So while you may challenge the accreditation organization, they are correct, your table does not meet the ‘nominal’ size requirements for at least the two standards ANSI C63.4 and C6310. Other standards may also have the nominal size issue as well. Thanks Dennis Ward Director of Engineering American Certification Body Certification Resource for the Wireless Industry http://www.acbcert.com 703-847-4700 fax 703-847-6888 direct - 703-880-4841 From: [email protected] [mailto:[email protected]] On Behalf Of Grace Lin Sent: Tuesday, October 11, 2011 4:16 AM To: WNya Cc: EMC-PSTC Subject: Re: Table Size in Emissions test Wendy, When I look for an accredited ANSI C63.4 laboratory, I expect the laboratory has the facility as stated in the standard, including a standard size of the table as defined in the standard. For this reason, unless the accreditation certificate bears a restriction note, I support the auditor's comment. >From the other point of view, many manufacturers' laboratories are for internal use only, including my employer's. For this reason, the auditor may be willing to accept the smaller size of the table. The question is how to determine if the laboratory is for internal use only (for testing certain type of products). An example is Alcatel-Lucent's EMC laboratory in New Jersey, USA. It opens to the general public. With regards, Grace On Mon, Oct 10, 2011 at 7:54 PM, WNya <[email protected]> wrote: Dear Experts, Recently my company went through the first ISO17025 audit. We have a table smaller than the standard requirement of 1.5m x 1m since our products are small, typically 10cm x 10cm x 10cm. The height of our table was 0.8m. The auditor wanted us to change the table size to follow the standard. What does it matter since we never use the extra space on the table? I do agree we must keep to the height requirement since the floor is a ground plane and thus it sets a fixed capacitance to the EUT and also controls the lengths of any attached cables. Can we reject or challenge the auditor's request? Has anyone experience the same situation? Sent from Wendy.Nya iPhone - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. 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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://product-compliance.oc.ieee.org/ 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://product-compliance.oc.ieee.org/ 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]>
