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Acoustic coupling cavity
Acoustic coupling cavity

CM 311

  • Acoustic coupling cavity

  • The CM 311 artificial ear is an ear simulator that simulates the way an earplug catheter is inserted into the ear canal or auricle, and simulates the coupling of the earphone with the human ear to measure the acoustic performance of the earphone.

    CM 311 pressure field artificial ear with built-in pre-polarized pressure field microphone, it is a coupling cavity for acoustic measurement of pre-polarized pressure field.

    With MegaSig PM 0083 and other IEPE signal conditioning to achieve the best test results;



  • Description
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Description

Specifications

ParameterValue
Sound Field TypePressure field
Earphone Type入耳式
Coupler Volume/
Frequency Response20Hz – 10kHz ± 0.5dB 10kHz – 16kHz ± 1dB
Dynamic Range/
Noise Floor33dB（A）
Sensitivity12.5mV (-38.0dB) ± 2dB
StandardITU-TP.57，2型传感器，IEC 60318-1：2009
Connector/
Operating Temperature/
Relative Humidity/


Specifications

Types of Acoustic Fields

Pressure Field

Frequency range

20Hz - 10kHz ±0.5dB   10kHz - 16KHz ±1dB

Background noise

33dB（A）

Sensitivity  mV/Pa(dBV/Pa)

12.5mV（-38.0dB）±2dB

standard

ITU-TP.57，Type Ⅱ sensor，IEC 60318-1:2009


Typical frequency response curve

4.png

Dimensions：mm

threaded interface

M23*0.5


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