Richard, I am not sure if you have noticed the difference of performance criteria defined in the earlier version of ESTI EMC standard ETS 300 385 and current EN 301 489 series standards. In ETS 300 385 - Criteria A is clearly defined, for radio transceivers - No BER is allowed, e.g. zero tolorence. This means the performance is defined (not willingfully by manufacturer) and limited to be BER and degradation of BER is not allowed. Obviously manufacturers had no choice but to follow. In EN 301 489 series std, the definition changed. Manufactures can define own performance and its reasonable performance level, no degradation of performance means no worse than defined performance level. Example of taking BER as the performance, but percentage of BER is allowed as long as it is reasonable and more importantly acceptable by their customers, obviously if the bar is set too low, their customers may not buy it. Hope this helps. Leslie [email protected] wrote: Most of the CENELEC immunity standards specify performance criteria A as follows:
"The equipment shall continue to operate as intended without operator intervention. No degradation of performance or loss of function is allowed below a performance level specified by the manufacturer when the equipment is used as intended. The performance level may be replaced by a permissible loss of performance. If the minimum performance level or the permissible performance loss is not specified by the manufacturer, then either of these may be derived from the product description and documents, and by what the user may reasonably expect from the equipment if used as intended." However, ETS 300 683 and ETSI EN 301489-1 and -3 (and I presume the other parts) read less clearly as "Operate as intended" and "No loss of function". Can one presume that CENELEC's more well defined wording of Criteria A can be applied to the ETSI standards? Specifically, can the manufacturer specify a degradation of performance or loss of function as long as the degraded performance is not less than what the user may reasonably expect from the equipment if used as intended. Richard Woods Sensormatic Electronics Tyco International --------------------------------- Do you Yahoo!? Faith Hill - Exclusive Performances, Videos, & more faith.yahoo.com
