ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

3aEA8. New requirement for electromagnetic compatibility of acoustical instrumentation.

Ernst Schonthal

Helge Larsen

Bruel & Kjaer Instruments, Inc., Denmark

Most electronic equipment is sensitive to electromagnetic signals. Often electronic equipment also radiates electromagnetic signals causing interference to other electronic equipment. To insure that the electrical equipment can work without influence from the electromagnetic environment and also can operate without disturbing the environment, all electric equipment including acoustical measuring instruments sold within the European Community must fulfill the requirements per EU50082-1 and -2, starting 1 January 1996. To achieve this goal a new special test laboratory has been established at Bruel & Kjaer in Denmark. Here, all existing and new measuring instrumentation are tested for conformance to EU50082-1 and -2. The results have shown that a number of the existent instrumentation will have to be modified or redesigned. The new Bruel & Kjaer Falcon(trademark) range of measuring microphones, preamplifiers, and power supplies has been designed in accordance with the new requirements of EU50082-1 and -2. This paper will describe measurement results and give examples of experience gained through this work.