½" Diffuse-field / Random incidence Microphone
Externally polarized, diffuse-field microphone designed for random-incidence measurements over 3.15 Hz to 10 kHz, and is approved for noise measurements in accordance with ANSI standards.incidence Microphone" class="button button--primary-cta">Request Price
- Diffuse-field / Random incidence measurements
- In-car measurement
- High humidity environments
USE OF DIFFUSE-FIELD MICROPHONES
A diffuse-field microphone, also called a random-incidence microphone, is designed to have a uniform response when signals arrive simultaneously from all angles.
They should therefore not only be used for measurement in reverberation chambers, but in all situations where the sound field is diffuse, or where several sources are contributing to the sound pressure at the measurement position.
Practical examples are indoor situations, where the sound is reflected by walls, ceilings, and objects in the room, or measurements inside a car.
The microphone is capable of withstanding the IEC 68-2-32 1 metre drop test.
The sensitivity can be calibrated at 250 Hz by using Pistonphone Type 4229 with our ½-inch Adaptor DP 0776, or at 1 kHz using Sound Calibrator Type 4231. For other frequencies, we recommend using Multifunction Acoustic Calibrator Type 4226.
The actuator response can be measured using Actuator UA-0033.
The random-incidence response can be obtained by adding the type-specific, random-incidence correction to the actuator response.
- 20 pF
- Dyn. range
- 15.5 – 148 dB
- Freq. range
- 3.15 – 10000 Hz
- Inherent noise
- 15.5 dB A
- Lower limiting frequency -3dB
- 2 Hz
- Diffuse Field
- Ext polarized
- Polarization voltages
- 200 V
- Pressure coefficient
- -0.008 dB/kPa
- 50 mV/Pa
- Temperature coefficient
- -0.015 dB/ºC
- Temperature range
- -40 – 150 ℃
- Sound field
- Microphone type
- Diffuse Field