Microtech Gefell Measurement Microphone MM 302

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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		–