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DIN 45635-41 Beiblatt 1:1986
Measurement of noise emitted by machines; airborne noise emission; enveloping surface method; hydraulic assemblies (test report specimen form)
The supplement contains a form for the determination of airborne noise emitted by hydraulic assemblies; determination of sound power level using the enveloping surface method ("free field"-method) for prescribed measuring conditions.
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Deutsches Institut für Normung [din]