Sound level measure hemisphere SLH 212

Constant tightening of directives with regard to compulsory information on the sound power level as a standardised comparative value for sound emissions is forcing manufacturers worldwide to take measurements in compliance with the law. Sound power measurements for compliance with legal requirements and the customer-oriented modification of product sound emissions (product sound design) are therefore of increasing market relevance. So-called enveloping surface methods are essential here, which enable measurements on test objects placed under a dome by means of sound power hemispheres/SLH, among other things. The sound power radiated by a noise source is measured at defined, statistically uniformly distributed measuring points on a dome-shaped measuring surface enclosing the source. The microphone or sensor positioning must be precise according to sound power standards. This challenge was followed by the development of a new hemisphere generation/SLH. The innovative SLH set new standards in terms of transport, mounting, statics, efficiency and precision of the measurements. New are special mounting and sound field optimised, laser-cut light metal rails with high-strength horizontal and vertical connecting elements as well as freely adjustable sensor universal suspensions. The sound power hemispheres available in two different sizes for the buildup of hemispherical microphone arrays with radii of one or two meters for up to 20 microphone positions each. Depending on the measurement task, the sound power hemispheres can be supplied with standard measurement microphones, particularly low-noise measurement microphones or measurement microphones for harsh environments.