Conformity Magazine - August 2008 - (Page 25)

he automotive ESD standard ISO 10605 has been around since the early 1990s, with the first Technical Report issued in 1994 (ISO/TR 10605: 1994). Although not formally issued as a first edition until 2001 (ISO 10605: 2001), the recommended test methods were used widely from the TR version and available as SAE standard J1113/13 before this. ISO 10605 has been almost universally adopted without alteration in the automotive industry (even in its initial TR form), and incorporated or referenced in most of the automotive vehicle manufacturer (VM) standards. ISO 10605 is based on models and premises similar to the commercial ESD standards derived from IEC 8012 Electromagnetic compatibility for industrial process measurement and control equipment – Part 2: Electrostatic discharge requirements (now IEC 61000-4-2). The test simulates the effect of a human body discharge of static electricity, a relatively common occurrence experienced by most users, particularly when entering or exiting the vehicle. The changes between the 1994 TR and 2001 issue were mainly the inclusion of an unpowered/non-connected test that reflected handling of an electronic sub-assembly (ESA) while in transit or during assembly fit (i.e. not in-situ on the vehicle). The ISO 10605 standard also included testing of the ESA onvehicle as well as powered bench testing of individual ESAs. ISO/DIS 10605:2007 was released for discussion in early 2007, and represents only the second iteration of this standard and the first revision since official release. The standard was due to be released in November 2007, but at the time of writing it is still at the final voting on the discussion document (FDIS) and is now due to be released (if adopted) in late 2008. ISO 10605 Discussion Document At first glance, a reader of the latest version of ISO 10605 may think there have been significant changes, since the standard has swelled from a modest 20 pages to a more substantial 48 pages. In fact, much of the content is similar, and many of the additional pages are purely textural and contain additional terms and definitions (for example, making the terminology consistent with IEC 61000-4-2). There are several pages in the annexes that are test rationale and target construction for calibration of the discharge device (ESD gun). There is also more test application descriptive text on selecting air or contact discharge (for example, text not found in the previous versions of this standard). Much of the additional text is certainly helpful and should make the application of the testing more consistent. However, most of the essential aspects of the automotive ESD standard remain as before. The genuinely new changes can take some time to identify and evaluate, in order to determine what impact they may have on testing and on the design requirements to meet the automotive ESD environment. T Environmental Test Conditions The parameters limiting the environmental conditions under which testing is conducted have been changed; mainly, they have been relaxed for both operating temperature and relative humidity, and now include a specification for barometric pressure. The relaxation of both temperature and humidity parameters is probably more of a reflection of the reality of some test facilities than a response to any specific issues (although ESD testing at 15°C with 60% humidity must be a frightening experience!). This innocuous change in operating temperature is not a problem for the vehicle or ESA being tested, but could present a safety risk to the test personnel. Temperatures below 16°C with high humidity (>50%) promote the formation of condensation. As a consequence, now allowing testing to 15°C could lead to possible electrical shock accidents. I would urge test services to remain within the previous lower temperature ISO Edition: Operating Temperature Relative Humidity Barometric Pressure DIS: 2007 25±10°C 20-60% 680-1060mBar Released: 2001 23±5°C 30-60% Not Specified Table 1: Environmental test parameters t sa e u 719 8 Se oth 200 Bo MC I E E it, M IEE Detro AUGUSt 2008 Conformity 25 http://www.captorcorp.com http://www.captorcorp.com http://www.captorcorp.com

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Conformity Magazine - August 2008 Contents Editor’s Note FCC Seeks Comment on Reauction of 700 MHz D Block Commission Cracks Down (Again!) on Junk Fax Marketer Canada Levies Fees for Public Safety Radio Spectrum FDA Issues Guidance on Medical Device Tracking Greenpeace Challenges Video Game Manufacturers The IEEE EMC Society: A Proud History of Accomplishments ESD Open Forum An Update on Changes to the Automotive ESD Standard, ISO 10605 Modeling of Radiated Electromagnetic Disturbances in Automotive Applications Design Issues in Automotive Radio Frequency Systems IEEE EMC Symposium IEEE 2008 Show Preview Exhibitors Buyer’s Guide Product News Most Eco-Friendly Companies Updated Standards List For the EU’s Pressure Equipment Directive Commission Issues Updated Standards List For Directive on Gas-Fired Appliances HHS Releases Fact Sheet on U.S. Imports from China Customs Agents Seize Holiday Lights IEEE PSES Symposium Set for October CPSC Actions in the News IEC Standards Update UL Standards Update Telcordia Standards Update From Our “You Can’t Make This Stuff Up” Department Looking Back: Items from Past Issues of Conformity Product Reviews Advertisers

Conformity Magazine - August 2008

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