We have just completed construction of a hemi-anechoic chamber, which will be used for testing our new VPV Whisper Pumps, as well as small power units and other BOSCH products. The sound chamber wil allow us to measure and improve the noisy characteristics of our products not only for sound levels, but also for sound quality, by incorporating design modifications before the final product is released. In addition we can accurately compare our products against our competitors in a controlled environment with very low ambient noise.

The inside dimensions of the chamber are 14' W x 13'L x 11.5' H (wedge tip to wedge tip), and although it was designed with 100Hz cut-off frequency, a qualification test by ECKEL Industries indicated that the chamber has 63Hz cut-off frequency. The chamber is constructed with metal perforated wedges filled with fiberous material for better performance. The chamber is built on an isolated concrete slab, in order to isolate any vibrations transmitted from the surroundings. A cliate control unit provides a controlled interior room environment with a constant temperature and relative humidity level. An observation system with a color monitor and a two way intercom system provides a remote communication between the operator inside the room and the person acquiring the data outside. In addition the observation/intercom system provides remote monitoring during the test. Provisions were made for easy removal of the pump test bed and support in order to accommodate even the large power units.

A multi channel data aquisition FFT analyzer (ZONIC PC7000) is used for performing noise and vibration measurements and analysis.

The chamber was built by ECKEL Industries, a company which specializes in building anechoic chambers. The chamber utilizes the latest tecnology in anechoic chamber construction and provides the a state of the art facility for noise and vibration testing and evaluation. The development of this chamber illustrates our desire to provide our customers with only the highest quality products. For more information about our new wisper Pump product line, you may refer to our vain pump catalog number 9 535 233 724.