In the period from May 16-17, 2013, in Prague was held meeting of the Subcommittee on sound in air (SC-A) and EURAMET Technical Committee for Acoustics, Ultrasound and Vibration (EURAMET TC-AUV).

In the part of the meeting regarding the contributions of National Metrology Institutes, Dr. Maja Aleksic, metrologist for acoustics from DMDM, presented the development of the new method for measuring geometric parameters of national standards for sound pressure in the Directorate of Measures and Precious Metals. For this study was used an optical measuring microscope from laboratory for dimensional metrology, and the result was the reduction of uncertainty of the primary reciprocal method of calibration of laboratory standard microphones on pressure. Presentation by DMDM were accepted with great interest, and welcomed paper and the establishment of links between different fields of metrology (the dimensional metrology, and acoustics), which is an effort in future development projects.