50 Anniversary of the first Sound level meter of the world In 2010 we celebrated the 50 anniversary of Model 2203, the father of all the sound level meters. The sound level meter turns 50 years In 2010 we celebrated the 50 anniversary of Model 2203, the father of all the sound level meters. It was the first sound level meter portable of precision and based on transistors of the world. One made during 21 years and it had sales record of 17,300 units. If to this we added its perfected versions, Models 2204 (Impulsive time constant) and 2209 (detector of tips), it was arrived at a total of 32,700 units. This is the history of the first portable sound level meter of the world, as it was registered in the archives and according to us they told those it lived that it. It does half century, the product presentations were not more than a humble one official notice in the section " The news of fbrica" in the last page of the Magazine Technique of Brel & Kjr.
Number 3 of 1960 included the bulletin that reproduces above. Don Sonmetro Our expert in design of sound level meters during decades, Peter Hedegaard, gives this explanation us of how the portable sound level meter evolved: " Model 2203 was the first portable sound level meter of Brel & Kjr. I am not who to say who was the father of this so special design, but most probable she is than as much P.V. Brel like Gunnar Rasmussen would have something to see, although the final design is attributed to Kay Mller Petersen. What had of special that one design was the frontal in the form of cone, that did possible to place the microphone in the housing without its acoustics was affected of significant form.