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How to do accurate half space measurements
in sub-optimal environments?
The directivity and other basic acoustic basic data of transducers are typically measured under half-space condition emulated by large baffle setups in anechoic rooms. However, measurement irregularities may arise due to:
Parasitic wave components from the acoustic shortcut and baffle edge diffractions
Mechanical vibrations from large baffle which emit parasitic sound and also disturb the measurement results.
To overcome these common drawbacks we recommend trying the holographic measurement approach with KLIPPEL's Direct Sound Separation module with the new SCN Near Field Add-On providing a virtual infinite baffle. The demo in our product video shows a directivity measurement of a small woofer mounted in a baffle. The transducer is operated in free air and measured in the front half-space.
By the way, measurements in a baffle are also available using the larger brother of the workbench, the NFS Carousel hardware.
The comprehensive statistical analysis of end-of-line test data is an important tool to understand production problems as early as possible in order to maximize overall product quality and production yield. While the KLIPPEL STAT module is highly suitable for analyzing statistics of KLIPPEL data in detail, there are highly efficient 3rd party tools like WATS by Virinco for gathering and monitoring data of multiple production lines and sites. For this reason, Virinco and Klippel have developed a converter that allows importing audio test data generated by the Klippel Analyzer System into WATS automatically.
Our new application note AN 81 Connecting KLIPPEL QC and WATS describes the integration of the Klippel QC data into the WATS platform.