GRAS Hemisphere Kits for Acoustic Testing Solutions
The GRAS hemispheres are compliant with the ISO 3744, 3745 and 3746 (ANSI S12.54, S12.55, S12.56) standards and accommodate for 4, 10 and 20 positions. These are clearly marked to ease the mounting and maintain measurement repeatability. Two hemisphere structures are available: a 1 m measurement radius and a 2 m measurement radius. Each structure is available in CCP, LEMO and LEMO lownoise variants.
The hemispheres, 1 m or 2 m radius, are available as preconfigured kits with 4, 10 or 20 microphone sets in 3 variations; CCP, LEMO and low-noise LEMO. The microphone sets can be connected directly to all professional measurement systems and are available for both CCP and 7-pin LEMO inputs. If your system platform supports intelligent transducers according to IEEE 1451.4 (TEDS), the system can be set up to identify the microphone properties and position in the array.
The GRAS hemispheres will hold and position the measurement microphones according to the standards and have been designed with focus on your workflow; They are very easy to assemble and it is easy to position and access the DUT. Furthermore, in best GRAS tradition they are optimized acoustically for correct and repeatable measurement data.
The structure is made portable to achieve a high degree of freedom of location. This, combined with the easy, tool-less assembly in minutes, enables you to save expensive anechoic chamber time and to offer on-site sound power diagnostics.
The microphone positions are clearly marked to ease the mounting and maintain measurement repeatability.
All included microphone sets are delivered with individual calibration charts including sensitivity values and frequency responses. These sensitivity values can be used directly in your system setup.
Typical applications and use:
Depending on the size and the emitted acoustic level of the DUT, the hemispheres will allow sound power measurements on everything from small sized personal electrics to office machines and IT products, household appliances, power tools and smaller engines. The only restriction is, that the characteristic dimension of the DUT may be no more than half the measurement radius.
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