Uses- Unattended outdoor installations
- Measurements in all weather conditions
- Microphone for noise monitoring systems
- IEC 61672 Class 1 compliant outdoor sound measurement
- Complaint investigations
| Features- Easy ™click-on’ and ™click-off’ assembly and disassembly
- Easy and true acoustical calibration
- CIC for on-site verification
- Measurement to EN/IEC 61672 Class 1 and ANSI S 1.40 – 1984
- Sensitivity 31,6 mV/Pa
- Wide dynamic range
- Built-in preamplifier with TEDS – IEEE P1451.4
- Protected against the effects of wind, rain and perching birds
- Useable for both 0° and 90° angle of incidence
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Many outdoor microphone systems provide durability at the expense of microphone accessibility, which makes acoustical calibration difficult. With Types 4952 and 4952-A, the windscreen can be removed in seconds, enabling easy true acoustical calibration of the microphone.
The Brüel & Kjær patented Charge Injection Calibration (CIC) feature allows precise verification of the microphone (including preamplifier and cabling) at remote sites.
Frequency response is precisely controlled, such that, with the appropriate linearization (as available with Brüel & Kjær’s Noise Monitoring Terminal Type 3639-E), EN/IEC 61672 Class 1 requirements are fulfilled up to 20 kHz. Typical frequency response without linearization is shown in Fig. 1.
Directivity Response
The complete microphone unit including wind and rain protection has been carefully designed in order to obtain true omnidirectional characteristics. With the appropriate filtering (as available in recommended Brüel & Kjær instrumentation), the requirements of the IEC 61672 paragraph 5.3 (table 1) and ANSI S1.4 – 1983 can be met with the same Outdoor Microphone, both for 0˚ and 90˚ reference direction, thus increasing the number of possible applications for Outdoor Microphones Types 4952 and 4952-A.
Windscreen and Rain Protection
A carefully designed windscreen keeps the airflow away from the microphone, thereby avoiding influence on the diaphragm from flow-borne pressure fluctuations. The windscreen also protects the microphone and preamplifier from the direct airflow, eliminating flow noise caused by von Karman vortices.
Additionally, the windscreen provides rain protection, but even if water should enter behind the windscreen, acoustically designed fine-mesh water protection will lead the water away, providing double rain protection for the microphone cartridge.
The upper part ends in a bird spike, which prevents birds from perching on the microphone. The end of...
For a full Description and Specifications, see Product Data
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