M 676

1/2inch, Pressure, 25dBA
The M 676 is a 1/2 inch prepolarized pressure field measurement microphone that is generally used to measure the acoustic performance of a product located in a coupling cavity. The main part is made of stainless steel so that it has good toughness and long-term stability.
The MegaSig A 802 preamplifier is recommended for optimal test results.

Specifications

Parameter	Value
Dimensions	1/2inch
Sound Field Type	Pressure field
Polarization Voltage	0V（Pre-polarized）
Frequency Response	20Hz – 16kHz ± 2dB 20Hz – 10kHz ± 1dB
Dynamic Range	25dB（A）-135dB （1000 Hz 失真<3%）
Noise Floor	25dB（A）
Sensitivity	50mV/Pa (-26.0± 2) dB re 1V/Pa
Standard	符合 IEC 61072-Ι型Standard
Typical Capacitance	12.0 pF
Pressure Equalization Method	Post-equalization
Operating Temperature	-20°C to 60°C
Temperature Coefficient	/
Humidity Coefficient	/
Relative Humidity	10% - 90% no condensation
Static Pressure Coefficient	/

Specifications

Types of Acoustic Fields	Pressure Field
Polarization voltages	0V（Prepolarized）
Frequency range	20Hz – 16kHz ± 2dB 20Hz – 10kHz ± 1dB
Dynamic range	25dB（A）- 135dB（1000 Hz THD<3%）
Background noise	25dB（A）
Sensitivity mV/Pa(dBV/Pa)	50mV (-26.0dB) ± 2dB
Capacitance Typical	12.0pF
Temperature range, operation	-20℃ to 60℃
Temperature range, storage	Temperature：25℃±5℃，Humidity：50%±15%RH（Ensure the long-term stability of the sensor）
Humidity range non condensing	10 - 90% without condensation
Humidity coefficient	<0.1dB

Typical frequency response curve

Dimensions

Height including protective cage	17.2mm
Diameter with protective cage	13.2mm
Height excluding protective cage	16.0mm
Diameter excluding protective cage	12.7mm
Front-loaded extreme fit thread	11.7mm - 60UNS
Protective cage engaging thread	12.7mm - 60UNS