PCB Test & Measurement Seite 155

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For Additional Specification Information Visit www pcb com PCB PIEZOTRONICS INC 716 684 0001 Fax 716 685 3886 153 Technical Information Microphones Low Cost Array Microphones Figure 31 Array Microphone System Standard Sensor Cables or Output Cables Multi Conductor Multi Channel Output Cable Multi Channel Data Acquisition System with ICP Sensor Power Patch Panel Acoustic Measurement Systems Array Microphones Array microphones are also a Prepolarized design with a free field response They are specifically designed to offer a cost effective solution for multiple channel sound pressure measurements Units are often arranged in a 2D Grid and used for applications such as Sound Pressure Mapping Beamforming or Holography By taking a number of Array microphones and spacing them out in a predetermined pattern users then have the ability to take the output into software and transform a complex sound pressure field into a map of the acoustic energy flow PCB 130E Series of array microphones have an integral preamplifier and can be directly powered from any ICP power source In addition each unit is TEDS compliant IEEE 1451 4 which when attached to a corresponding TEDS capable ICP Signal Conditioner provides a self identification of the sensors calibration information As with all inexpensive alternatives the 130E Series array microphones also have some limitations as compared to our 377 Series of Condenser Microphones Specifically they have a reduced frequency response 20 Hz to 10 000 Hz 2 dB In addition they are more sensitive to changes in voltage sensitivity due to varying temperature or humidity PCB model CAL 250 provides a simple method of verifying actual voltage sensitivity prior to performing each test 9 T Mcatalog 2011 Seite 125 166 SYN G500 21 04 11 18 04 Seite 159