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1/4inch, pressure-field, 20kHz

M 657

  • 1/4inch, pressure-field, 20kHz

  • The M 657 is a 1/4-inch pre-polarized pressure-field measurement microphone designed for ultra-high sound pressure level measurement, explosion sound pressure level measurement, and similar applications. 

    All microphones undergo rigorous environmental aging tests, providing them with advantages such as a wide frequency range, broad dynamic range, flat frequency response, and long-term stability. This enables the collection of acoustic source information across an ultra-wide frequency band.


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Description

Specifications

ParameterValue
Dimensions1/4inch
Sound Field TypePressure field
Polarization Voltage0V（Pre-polarized）
Frequency Response5Hz – 20kHz ± 2dB
Dynamic Range62dB（A）-175dB
Noise Floor62dB（A）
Sensitivity0.25mV/Pa (-72dB± 3dB） re 1V/Pa
StandardIEC 61094-4 type，WS3P
Typical Capacitance6.0pF
Pressure Equalization MethodPost-equalization
Operating Temperature-20℃ ~ 60℃
Temperature Coefficient/
Humidity Coefficient/
Relative Humidity20% - 90% no condensation
Static Pressure Coefficient/

Specifications

Humidity coefficient

Types of Acoustic Fields

Pressure Field

Sensitivity  mV/Pa(dBV/Pa)

0.25mV/Pa   (-72dB ± 3dB) re 1V/Pa

Frequency range

5Hz-20kHz ±2dB

Dynamic range

62dBA - 175dB

Background noise

＜62dBA

Typical capacitance

6.0pF

Operating temperature range

-20℃ to 60℃

Temperature coefficient

-20 to 60 °C; sound pressure level variation < -0.003 dB
(at 250 Hz, reference temperature 23 °C)

Humidity coefficient

20% to 90% RH; sound pressure level variation < -0.003 dB
(at 250 Hz, reference temperature 40 °C, reference RH 50%)
Storage conditions

Temperature: 25°C ± 5°C, Humidity: 50% ± 15% R

H(ensures long-term stability of the sensor)



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