My friends, I am preparing to drill new threaded holes in our chamber floor, where we will perform our CISPR32 (2012) conducted emissions tests. Looking at Table D.1 and figure D.2, I am trying to figure out where to place our two AMNs and single AAN to meet all of the distance and length requirements.
Our setups will look very much like figure D.2, but shape and number of AE will vary (naturally). What boggles my mind is how to have fixed positions for the AMNs and AAN (I don't want to turn my chamber floor into Swiss cheese), and avoid having to rearrange the EUT on the test table when switching from AC port measurement to let's say, network port measurement. Figure D.2 seems to suggest that its layout permits exactly what I'm looking for. However, reading the note of the figure (no longer a note in version 2015, by the way) and looking at the distance requirements in table D.1, I don't understand how figure D.2 permits EUTs to become AEs, without rearrangement. For example, let's say you are measuring the middle EUT using the AAN, then how can the PSU at the left be >= 0.8m from the active AAN? The note says that if the device is AE, then it shall be at a >= 0.8 m distance. So this PSU now being AE, shouldn't it be at more than 0.8 m from the AAN? Is the figure misleading in indicating that each device can be EUT or AE at its current position? Keep in mind that Table D.1 also states that all cables must be kept at 0.4 m from the vertical plane. CISPR22 had figures that showed AMNs all over the place, even bonded to the vertical plane. CISPR32 now shows all AMN/AAN at the 40 cm line. D.2.2 text still allows AMN/AAN to be bonded to the vertical plane, but then how do you maintain the 40 cm distance for the cables if their endpoint is essentially at a few centimeters from the plane? Another question is about this "new" insulation pad underneath the table. There is a maximum thickness of 0.15m specified for this insulation, but no minimum. Are the cable outer sleeves enough? Is a coat of enamel paint on a metal turntable enough? I understand that bare wires shouldn't make contact with ground if they're not supposed to, but is an insulation pad really necessary when cables are not bare? Please let me know what your thoughts are, there must be something I'm not seeing here. AP - ---------------------------------------------------------------- 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]>
