Nor1225 Free-field Microphone

The Nor1225 is a precision 1/2" free-field condenser measurement microphone designed to meet the demanding requirements of IEC 61094-4 Class 1. With a nominal sensitivity of 50 mV/Pa and a wide frequency response from 3.15 Hz to 20 kHz, the Nor1225 is the standard microphone supplied with Norsonic sound level meters for general-purpose environmental, occupational, and building acoustics measurements. As a free-field microphone, the Nor1225 is optimized for sound arriving from a defined direction (0° incidence), incorporating corrections for the diffraction effects caused by the microphone's own physical presence in the sound field. This makes it the correct choice for outdoor environmental noise monitoring, directional industrial noise assessments, and any measurement where the sound source direction is known and the microphone can be oriented accordingly per IEC 61672-1 requirements. The Nor1225 features TEDS (IEEE 1451.4) compatibility for automatic identification and sensitivity configuration when connected to TEDS-enabled instruments. The externally polarized design with 200 V polarization ensures the highest measurement stability and lowest noise floor. For acoustics professionals across the GCC performing regulatory noise measurements, the Nor1225 delivers the Class 1 accuracy and traceable calibration required for legally defensible environmental assessments, construction noise compliance, and occupational exposure documentation.