TYPE 4943

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.

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USE SCENARIOS

  • 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.

ROBUSTNESS

The microphone is capable of withstanding the IEC 68-2-32 1 metre drop test. 

CALIBRATION

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.

Capacitance
20 pF
Diameter
1/2
Dyn. range
15.5 – 148 dB
Freq. range
3.15 – 10000 Hz
Inherent noise
15.5 dB A
Lower limiting frequency -3dB
2 Hz
Optimised
Diffuse Field
Polarization
Ext polarized
Polarization voltages
200 V
Pressure coefficient
-0.008 dB/kPa
Sensitivity
50 mV/Pa
Temperature coefficient
-0.015 db/ºC
Temperature range
-40 – 150 C
Venting
Rear
Weight
gram
Sound field
Diffuse-field
Microphone type
Diffuse Field