Measurement microphone MM 210

The 1/2 ”measuring microphone MM 210 opens up the possibility of using a high quality, pre-polarized measuring microphone capsule MK 250 on measuring systems with IEPE supply. Array arrangements and envelope surface measurement methods, for example in motor vehicle acoustics, come into consideration as typical applications.

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The electrical connection is made via the permanently attached BNC connector with standard BNC cables. The preamplifier is equipped with built-in memory for microphone identification, with which microphone data can be written and read by the manufacturer/user (IEEE P1451.4 TEDS editor).

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		0 V
Limit sound pressure level for 3% harmonic distortion at 1 kHz		135 dB
Limit sound pressure level	with reduced no-load supply voltage (UL = 18 V DC)	130 dB
Output voltage		≤ 6.5 Veff
Output impedance		<100 ohms
Nominal terminating impedance		100 kOhm
Operating current		2 mA to 10 mA, nom. 4 mA
Recommended open circuit voltage of the power supply unit		UL 24 V DC to 30 V DC
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
Temperature limits		-50 ° C to +100 ° C
Moisture limits		rH <100%, condensation not allowed
diameter	with protective cap	13.2 + 0.05 mm
	without protective cap	12.7 + 0.05 mm
length		97 mm (including connector)
Weight		45 g
Thread for preamplifier		11.7mm 60 US
Thread for protective cap		12.7mm 60 US
Connectors		BNC
Memory for microphone identification		256-bit 1-WireTM EEPROM (DS 2430 AP)