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Measurement Microphone MM 302

The 1/4 ”measuring microphone MM 302 opens up the possibility of using high quality, externally polarized measuring microphone capsule MK 301 on measuring systems with 7-pin. LEMO connection to be used.



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The electrical connection is made via a permanently connected, three-meter-long cable including a 7-pin LEMO connector.

The MH 64 microphone holder with a 1/4 ”cone is recommended for holding the microphone. The use of the 1/4 ”measuring microphone capsule accessories, such as a windshield etc., is possible without any problems.

The measurement microphone can be calibrated with the Pistonfon Type 5002 or with other suitable sound pressure calibrators using a 1/4 “adapter.

Converter typeCapacitive pressure receiver, according to WS3F (DIN EN IEC 61094-4)
Operating transfer coefficient5 mV / Pa
Operational transmission rate-46 dB ± 1.5 dB re 1V / Pa
Free field correction for 1 kHz0 dB
Diffuse field correction for 1 kHz0 dB
Reference directionMicrophone axis
Frequency range of the free field transmission factor5 Hz to 100 kHz (± 2 dB)
Polarization voltage200 V
Limit sound pressure level for 3% harmonic distortion at 1 kHz168 dB
Limit sound pressure levelwith reduced no-load supply voltage (UL = 28 V DC)157 dB
Output voltage≤ 35 Veff
Output impedance<100 ohms
Nominal terminating impedance100 kOhm
Start-up time1 min.
Equivalent noise level DIN EN 6065135 dBA
Magnetic field influence 80 A / m, 50 Hz
Influence of mechanical vibrations 1 m / s²
Working temperature range ˂ ± 0.5 dB-25 ° C to +100 ° C
Moisture limitsrH <100%, condensation not allowed
Temperature coefficient≤ 0.01 dB / K
Static pressure coefficient1×10-5 dB / Pa
Temperature limits-50 ° C to +100 ° C
diameterwith protective cap6.35 mm ± 0.02 mm
without protective cap7.0 mm ± 0.02 mm
Thread for preamplifier5.7mm 60 US
Thread for protective cap6.35mm 60 US
Connectors7pol. Lemo
Memory for microphone identification


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