AcSoft
Svantek UK

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.

 

Microtech Gefell

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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 type Capacitive pressure receiver, according to WS3F (DIN EN IEC 61094-4)
Operating transfer coefficient 5 mV / Pa
Operational transmission rate -46 dB ± 1.5 dB re 1V / Pa
Free field correction for 1 kHz 0 dB
Diffuse field correction for 1 kHz 0 dB
Reference direction Microphone axis
Frequency range of the free field transmission factor 5 Hz to 100 kHz (± 2 dB)
Polarization voltage 200 V
Limit sound pressure level for 3% harmonic distortion at 1 kHz 168 dB
Limit sound pressure level with reduced no-load supply voltage (UL = 28 V DC) 157 dB
Output voltage ≤ 35 Veff
Output impedance <100 ohms
Nominal terminating impedance 100 kOhm
Start-up time 1 min.
Equivalent noise level DIN EN 60651 35 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 limits rH <100%, condensation not allowed
Temperature coefficient ≤ 0.01 dB / K
Static pressure coefficient 1×10-5 dB / Pa
Temperature limits -50 ° C to +100 ° C
diameter with protective cap 6.35 mm ± 0.02 mm
without protective cap 7.0 mm ± 0.02 mm
length
Weight
Thread for preamplifier 5.7mm 60 US
Thread for protective cap 6.35mm 60 US
Connectors 7pol. Lemo
Memory for microphone identification

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