Microtech Gefell Measurement Microphone MM 225

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The electrical connection is made via a permanently connected, two-meter-long XLR cable.

We recommend the MH 64 microphone holder with a 1/2 ”clamp to hold the microphone. The use of the 1/2 ”measuring microphone capsule accessories such as windshield, nose cone, dry adapter etc. is possible without any problems.

The measurement microphone can be calibrated with the Pistonfon Type 5002 or with other suitable sound pressure calibrators.

Converter type		Capacitive pressure receiver, according to WS2F (DIN EN IEC 61094-4)
Operating transfer coefficient		50 mV / Pa
Operational transmission rate		-26 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		3.5 Hz … 20 kHz, class 1 DIN EN 60 651
Polarization voltage		200 V
Limit sound pressure level for 3% harmonic distortion at 1 kHz		> 138 dB
Output voltage		≤ 7.5 Veff at 1 kHz / 1% THD
Output impedance		<100 ohms
Nominal terminating impedance		100 kOhm
Start-up time		1 min.
Equivalent noise level DIN EN 60651		15 dBA
Magnetic field influence 80 A / m, 50 Hz		<22 dB
Influence of mechanical vibrations 1 m / s²		60 dB (20 Hz to 1 kHz)
Working temperature range ˂ ± 0.5 dB		-25 ° C to +100 ° C
Temperature coefficient		≤ 0.01 dB / K
Static pressure coefficient		1×10-5 dB / Pa
Moisture limits		rH <100%, condensation not allowed
Temperature limits		-50 ° C to +100 ° C
diameter	with protective cap	13.2 + 0.05 mm
	without protective cap	12.7 + 0.05 mm
length
Weight
Thread for preamplifier		11.7mm 60 US
Thread for protective cap		12.7mm 60 US
Connectors		XLR
Memory for microphone identification		–