Nor1239 Free-field Microphone

The Nor1239 is a precision 1/4" free-field prepolarized condenser measurement microphone designed for applications requiring extended high-frequency response and compact physical dimensions. With a usable frequency range extending from 4 Hz to 40 kHz, the Nor1239 significantly exceeds the bandwidth of standard 1/2" microphones, making it essential for ultrasonic measurements, aeroacoustic research, and precision laboratory applications. The smaller 1/4" diameter provides two key advantages over 1/2" microphones: first, the reduced diaphragm size extends the upper frequency limit by minimizing diffraction effects at high frequencies; second, the compact physical profile reduces acoustic interference in confined measurement spaces and near surfaces where a larger microphone would distort the sound field. The prepolarized design eliminates the need for an external polarization voltage supply, simplifying the measurement chain. The Nor1239 is the microphone of choice for automotive NVH engineers, aeroacoustic researchers, and precision acoustics laboratories across the GCC and internationally. When paired with the Nor1205 1/4" preamplifier, it provides a complete high-frequency measurement solution for applications including in-duct fan noise measurements, brake squeal analysis, tire-road noise characterization, ultrasonic process monitoring, and any application where frequencies above 20 kHz must be accurately captured and analysed.