M 671

1/2inch, Pressure, 16kHz
The M 671 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.

Specifications

Parameter	Value
Dimensions	1/2inch
Sound Field Type	Pressure field
Polarization Voltage	0V（Pre-polarized）
Frequency Response	（12.65 ± 3.15）mV/Pa (-38.0 ± 2)dB re 1V/Pa
Dynamic Range	30dB（A）-147dB（1000 Hz THD <3%）
Noise Floor	＜30dB（A）
Sensitivity	12mV/Pa(-38.0± 2) dB re 1V/Pa
Standard	符合 IEC 61072-Ι型Standard
Typical Capacitance	14.0 pF
Pressure Equalization Method	Post-equalization
Operating Temperature	-30℃ ~ 85℃
Temperature Coefficient	-0.012dB/℃
Humidity Coefficient	<0.1dB (0% - 90% no condensation )
Relative Humidity	0% - 90% no condensation
Static Pressure Coefficient	-0.01dB/kPa
Storage conditions	Temperature: 25°C ± 5°C, Humidity: 50% ± 15% RH (ensures long-term stability of the sensor)

Specifications

Typical frequency response curve

Dimensions

Height including protective cage	12.7mm
Diameter with protective cage	13.2mm
Height excluding protective cage	11.7mm
Diameter excluding protective cage	12mm
Front-loaded extreme fit thread	11.7mm - 60UNS
Protective cage engaging thread	12.7mm - 60UNS

M 671尺寸.png

Ordering Information

PN	Model	Description
900001-02	M 671	1/2-inch pre polarized pressure field measurement microphone
900011-23	M 671+A 815	1/2-inch pre polarized pressure field measurement microphone kit
900011-03	M 671+A 802	1/2-inch pre polarized pressure field measurement microphone kit