The Society for Reliability and Environmental Testing, SPM has issued a report with a comparative analysis of optocouplers* immunity performance when exposed to typical EMC tests.
The general results of this report are: * Some - and not all - optocouplers can successfully be used in apparatus for galvanic insulation of inputs/outputs in industrial electromagnetic environ*ments and without additional common mode filters. * The present data sheets on optocouplers do not provide sufficient information to design an apparatus and predict all the normal electromagnetic immunity parameters. This report can help the design and prediction, but tests are still required. * All optocouplers will produce a short wrong output signal, when exposed to normal fast common mode transients/burst. 24 different optocouplers from six different manufacturers were subjected to electro*magnetic immunity tests, which are commonly used for test of commercial apparatus aimed at industrial environments. The disturbances were surge transients, fast tran*sients/burst, conducted radio frequency signals, and radio frequency electromagnetic fields. The report is: "Immunity of Optocouplers to Electromagnetic Disturbances", SPM-139 by Viggo Brøndegaard Nielsen, DELTA Electronics Testing. Members of SPM automatically receive the report, and others can buy the report from SPM - price DKK 1200.-. Contact Ms. Lisbeth Valentiner, DELTA Danish Electronics, Light & Acoustics, Telephone: +45 42 86 77 22, e-mail: [email protected]. SPM is an independent organisation consisting of more than 100 company members in Scandinavia. SPM initiates and finances unprejudiced investigations of common interest for its members - mainly in the field of reliability problems and testing of electronic components and materials. List of some other SPM reports: http://www.delta.dk/spm/rapplist/welcome.htm
