TYPE 4943

½-inch diffuse-field microphone, 3.15 Hz to 10 kHz, 200V polarization

Designed for general, random-incidence measurements. Also suitable for noise measurements in accordance with ANSI standards.

Demande de devis

USE SCENARIOS

  • Diffuse-field 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 4228 with ½" Adaptor DP 0776, or at 1 kHz using Sound Level Calibrator Type 4231. For calibration at other frequencies use 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
Dynamic range
15.5 – 148 dB
Frequency 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