OM242/OM262 Permanent Outdoor Microphone2022-01-14
OM242/OM262 permanent outdoor microphone is developed by BSWA Tech for outdoor noise monitor. Compared with semi-permanent outdoor microphone, the main improvement of permanent outdoor microphone is the built-in electrostatic actuator which can be used for remote system check of the microphone. The external excitation signal source that can generate sine wave signal with frequency of 500 Hz and amplitude of 210 Vpeak ~ 280 Vpeak (about 150 VRMs ~ 200 VRMs) can excite the microphone generate 90 dB@1 KHz output signal. Electrostatic actuator can be used for whole system check including microphone, cable and measuring instrument, but it cannot completely replace the sound calibration. Therefore, it is still necessary to use sound calibrator for calibration regularly.
The frequency response of OM242 is optimized for 0° incidence, primarily for aircraft and airport noise measurement. The OM262 is optimized for 90° incidence, primarily for urban, traffic and industrial noise measurement. Both of two types of microphones have been specially designed to achieve the free-field frequency response in specified direction of incidence within the limits of IEC 61672-1. Each microphone is supplied with an individual calibration certificate that contains the actual sensitivity and free-field frequency response data for the complete set of outdoor microphones. Users can use the calibration data to correct the measurement data for more accurate results.
OM242/OM262 meets the IP55 ingress protection rating. The 90mm windscreen, internal rain hood and dust mesh can fully protect microphone to against wind, rain, snow, dust and other severe weathers. The bird spike prevents impact of perching birds to the measurement.
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