If you do your own calibration you need to follow the requirements in ISO 17025 for calibration labs. This requires that you calculate your measurement uncertainty, where a test alb is only estimating the uncertainty.
Best Regards Lothar Schmidt Director Regulatory & Antenna Services CETECOM Inc. 411 Dixon Landing Road Milpitas, CA 95035 Phone +1 (408) 586 6214 Fax +1 (408) 586 6299 email lothar.schm...@cetecomusa.com This e-mail may contain proprietary, privileged and confidential information for the sole use of the named intended recipient. Any review or distribution of this e-mail by any party other than the intended recipient or that person's agent is strictly prohibited. If you are not the intended recipient, please delete all copies and immediately contact the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Spencer, David H Sent: Thursday, December 11, 2008 8:14 AM To: emc-p...@ieee.org Subject: RE: DIY Equipment and Calibration Larry, For EMC calibrations done in house, I don't think you "have" to write a procedure if the standard calls out the procedure. Clearly if you are doing something unique, or a calibrating a unit which does not have parameters covered in a standard you need a written procedure. With our Quality Manual, we use the KISS frame of mind for everything. If a given reference standard calls out the procedure, we simply reference that procedure as our process for calibration. Why would you write a procedure for NSA or LISN verification when it's called out in C63.4, CISPR 16, or CISPR 22? An assessor would have a hard time writing a deficiency on that account (provided you actually use the standard as the process). Any assessors willing to comment? Dave Spencer From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Larry Stillings Sent: Thursday, December 11, 2008 10:50 AM To: emc-p...@ieee.org Subject: RE: DIY Equipment and Calibration One other thing to add to this thread (as we just went through an audit) is you will need to write a test procedure for the calibration (preferably with pictures of the calibration setup). Larry Stillings From: rehel...@mmm.com [mailto:rehel...@mmm.com] Sent: Thursday, December 11, 2008 10:45 AM To: emc-p...@ieee.org Subject: RE: DIY Equipment and Calibration I believe that you will also need your calibrating equipment traceable to a National Standards group such as NIST in the US. Bob Heller 3M EMC Laboratory, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 ============================================================== "Spencer, David H" <David.Spencer@xe To rox.com> <cmander...@micron.com> Sent by: <emc-p...@ieee.org> emc-p...@ieee.org cc Subject 12/11/2008 08:04 RE: DIY Equipment and Calibration AM Chris, I've built several CDN's. Repaired both CDN's and LISN's. Never messed with building an EM clamp. Too much hassle IMO. As far as calibration, I try to calibrate as much as is practical "in house". All the LISN's, ISN's, CDN's, cable loss, amplifier performance, etc etc . But in reality those "calibrations" are just "verifications". To perform those verifications most people are lacking a network impedance analyzer. The test jigs or setups are easy to build or cheap to purchase. Regarding an accrediting organization accepting the results, you'll need a process. You can't go wrong by referencing CISPR 16 et. al. in that respect. You'll need the verification data. AND, you'll need the measurement uncertainty. The last item, you can gather from your impedance analyzer accuracy specifications (and calibration report) and the test jig VSWR & losses. As for where you can send you in-house built test items, most any ISO17025 test lab which calibrates EMC or similar devices can perform the calibration. Regards David Spencer EMC Engineer Xerox Corp. From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of cmander...@micron.com Sent: Wednesday, December 10, 2008 5:00 PM To: emc-p...@ieee.org Subject: DIY Equipment and Calibration I'm aware of some people making their own CDN's and LISN's among other things and I have few questions about that. 1) Has anyone tried to build their own EM Injection clamp? If so, were you able to find a ferrite supplier that sold half-ring cores? 2) Is it acceptable to calibrate your own equipment? If so, how do accrediting bodies view this, and what documentation will they want to see? If not, does anyone have suggestions about where in the US I can send such homemade equipment for calibration (preferably Western US to save on shipping)? Thanks, Chris - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> 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. 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