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Mechanics and Acoustics

Division 1

Weight, force, velocity, loudness -€“ the mechanical and acoustic quantities are cared for by Division 1. Apart from basic research, testing within the scope of legal metrology is a main task.


The Division carries out basic research in the field of mechanical and acoustical measurands. On the basis of the Units and Time Act, standards and standard measuring devices are developed with the aid of which the measurement scales for all relevant mechanical and acoustical measurands such as mass, force, torque, acceleration, flowrate of gases and liquids, sound and ultrasound pressure can be realized with maximum accuracy and disseminated, predominantly to DAkkS laboratories. The tasks of the Division also comprise type examinations and certifications of measuring instruments on the basis of national regulations - such as the Verification Act and the Verification Ordinance - of European Measuring Instruments Directives as well as international recommendations of the OIML. In addition, employees of the Division provide advice in all matters of relevant metrology, assess DAkkS and other calibration and test laboratories and cooperate in the respective national and international committees.


The sound emission of technical devices, machinery and equipment has to be declared for purposes of environmental protection, occupational health and consumer information. An upper limit for the sound emission is legally binding for some machines used outdoors. The descriptor for sound emission is the sound power level, which is measured by internationally harmonised methods. A disadvantage of...

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The volume of silicon spheres with a mass of 1 kg could previously be measured by means of hydrostatic weighing with an uncertainty of 0.8 mm³ (k = 2). Using new and more stable thermistors to determine the temperature distribution in the measuring liquid of the fundamental weighing apparatus, a hydrostatic volume determination with an uncertainty of 0.35 mm³ (k = 2) will be possible in the...

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