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1/8 inch，Pressure field，20KHz

M 631+A 818

  • 1/8 inch，Pressure field，20KHz

  • M 631+A 818 is a 1/8-inch pre polarized pressure field measurement microphone used for high-frequency measurements, high sound pressure level measurements, etc. Due to its small size, it has very little impact on the sound field during measurement.

  • Description
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Description

Specifications

Types of Acoustic Fields

Pressure Field

Polarization0V（Pre polarized）

Sensitivity mV/Pa(dBV/Pa)

0.8mV/Pa（-62dB ±3dB）

Frequency range

10Hz-20KHz ±2dB

Dynamic range

60dBA- 175dB

Background noise

＜60dBA

Typical capacitance

3.0 pF

Temperature range

-10℃ - 50℃

Temperature coefficient

-20~60°C，ΔSPL < −0.003 dB (at 250 Hz, reference temperature: 23 °C)

Humidity coefficient

20% ~ 90% RH, ΔSPL < -0.003 dB (at 250 Hz, reference temperature 40°C, reference RH 50%)

Storage conditions

Temperature: 25 °C ±5 °C
RH: 50% ±15% RH (for long-term stability)


Dimensions

M 631+A 818尺寸图.png


The measuring microphones we produce are precision sensors, and all aspects related to production are strictly controlled, including material selection, production processes, testing control, and production environment.

图片1.pngAfter years of continuous improvement, we now use special nickel alloy materials as the core material for the diaphragm. Compared to other alloy materials, it exhibits higher sensitivity, lower distortion rate, and more stable long-term performance. The front body of the microphone is made of stainless steel, ensuring that the entire microphone maintains extremely robust structural characteristics even under various assembly conditions.

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We adopt advanced production processes and fully automated precision machining equipment, which significantly reduces the accuracy errors caused by secondary clamping in traditional machining equipment. This greatly enhances the dimensional consistency, geometric accuracy, and overall quality stability of the products, providing reliable technical support for demanding application scenarios.

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At the same time, we employ extremely rigorous testing and control measures, conducting quantitative testing on any links that may lead to product quality issues, and implementing test sequence control to prevent skip-station situations. The comprehensive MES control enables all data to be traceable, ensuring a high degree of consistency in sensor quality.

图片4.pngThe entire production process of all our microphones is strictly carried out in a dust-free workshop, which can minimize the amount of dust in the air, thus creating a stable and pure working environment for the sensors. This ensures a long and stable lifespan for the sensors and maintains their excellent performance throughout daily use.


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