In message <[email protected]> [email protected] writes:
> Could someone provide their knowledge of or resources for the control or > mitigation of EMI through the use of software? Bob and EMC-PSTC colleagues: There was an excellent colloquium on this subject at the IEE in London last November. I am appending below a copy of the announcement (which did appear here last year), and the IEE or Richard Marshall may be able to provide copies of the digest. -- Bill Lyons - [email protected] / [email protected] ELECTROMAGNETIC COMPATIBILITY OF SOFTWARE IEE, Savoy Place, London WC2R 0BL, UK Thursday, 12 November 1998 Colloquium organised by IEE Professional Group E2 (Electromagnetic compatibility). Co-sponsored by the British Computer Society. Appropriate software resilience can significantly improve the immunity of computer based hardware that must operate despite electromagnetic interference. Input, output and network connections pose particular problems. In cost-sensitive applications the requirement for filtering and shielding can be reduced, and in high integrity systems software can help ensure fault-tolerant or fail-safe response to extreme electromagnetic stress. Accordingly the Colloquium will address the software design techniques that can improve immunity to lightning and electrostatic discharge, to radiation from cellular phones and other transmitters and to mains-borne interference. Software design to minimise emissions will be of interest. Closely related hardware such as watchdog circuits will be covered. Contributions covering the interaction between software resilience and EMC testing will be welcomed, as will descriptions of new developments and tutorial papers. Special provision will be made for short contributions describing specific problems and their solutions. For details of attendance at the Colloquium, contact The Institution of Electrical Engineers, Savoy Place, London WC2R 0BL, UK Tel: +44 171 240 1871 ext 2205 or 2206 +44 171 836 0313 (recorded announcements re meeting changes) Fax: +44 171 240 7735 email: [email protected] URL: http://www.iee.org.uk/ Although the formal deadline (14 August 1998) for submissions has passed, a late contribution may be possible by submitting a synopsis to: Richard C Marshall The Dappled House, 30 Ox Lane, Harpenden, Herts AL5 4HE, U.K. Tel: +44 1582 460 815 email: [email protected] N.B. In response to queries in the EMC-PSTC mailing list (for details of this list see section 1.4 of the s.e.e.c FAQ), Richard responded with the following FAQs: Readers have asked: * If they can get the colloquium papers? The answer is yes, after the event, and at a charge. Email me at [email protected] if you want details in November. * What is it all about? Two examples: * Software filtering of inputs. I have recently done a fast-transient test to IEC801-4 on a microprocessor based product that serves two different functions according to the position of a remote switch. It failed the test, jumping from one function to the other when the test was applied. (The IEC801-4 bursts are quite brief but recur every 300 ms during the test). If the software had been written to wait and check again, say 200 ms after the switch appeared to have changed, that it was indeed still changed, then the product would have been immune to this interference. The resulting delay in responding to the switch would not have mattered in this application .... and a few extra lines of code cost nothing when the device is in quantity production. * Reset and restart after program corruption "Watchdogs" are actually quite difficult to design, but a good one can ensure that a product recovers without any help from the user after impulsive interference - fast transient or ESD - which can change the failure from "performance criterion A" to "performance criterion B" in EN50082-1. Now, have readers any experiences of this sort of software design/EMC interaction that they could share? If so I would like to hear them!. Richard Marshall Richard Marshall Limited, Herts., UK Analogue & rf design; EMC; Safety Critical Systems (see above for address, phone & email details) --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
