MM 210
The current powered 1/2” Measuring Microphone MM 210 offers facilities for the use of a high-quality electret measuring microphone capsule type MK 250 on multi-channel systems. Typical applications like array arrangements and covered area measuring procedures, e.g. automotive acoustics, can be taken into account.
The measuring microphone is connected to the usual current powered measuring channels such as *ICP® and *Delta Tron® via BNC cable. The microphone holder MH 64 with 1/2” clamp is recommended for mounting. Due to the equality of mechanical construction to conventional 1/2” measuring microphones the 1/2” measuring microphone capsule accessories, e.g. windscreen, nose cone, dehumidifier, etc. can be used. Please check the appropriate data sheets.
The measuring microphone can be calibrated with the Pistonphone type 5002 or other current sound pressure calibrators.
The integrated memory for microphone identification is one of the outstanding features. Microphone data can be entered and read by the manufacturer/user (IEEE P1451.4 TEDS editor).
*trade mark: ICP® PCB Piezotronics Inc. / Delta Tron® Brüel & Kjaer
Maintenance and Upkeep
In order to maintain its functioning the measurement microphone capsule should be protected against mechanical damage. It should be disconnected from its power source and completely checked for any pollution in regular intervals that have to be defined depending on the operating conditions.
After removal of the protection grid the pollution within the grid and on the diaphragm should be cleaned very carefully with a soft clean cloth or brush.
The measurement microphone capsule is not suitable for use in chemical aggressive conditions and in conductible dust. Condensation must be avoided.
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1/2” Measuring Microphone
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MM 210
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Microphone Class 1 21.31- 02.03 PTB-licence no. for official calibration
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Transducer type
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Capacitive pressure transducer
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* Sensitivity
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50 mV/Pa
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Correction free-field at 1 kHz
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0 dB
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Random incidence at 1 kHz
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0 dB
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Principal axis
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Microphone axis
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* Frequency range free field response
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3,5 Hz ... 20 kHz, Class 1 DIN EN 60 651
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Polarization voltage
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0 V
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* Capacitance at 1 kHz
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19 pF
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Max. SPL for THD 3 % at 1 kHz
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135 dB
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Output voltage K = 3 %
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≥6,5 V eff
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Output impedance
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< 100Ω
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Nom. load impedance
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100 kΩ
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Current consumption
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2 ... 10 mA
nom. 4 mA |
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Transducer Excitation
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UL 24 ... 30 V DC
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Time for power up
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1 min.
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Equivalent loudness level DIN EN 60651
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15 dB A
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Influence of magnetic field 80 A/m, 50 Hz
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< 22 dB
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Influence of vibration 1 m/s², 20 Hz ... 1 kHz
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60 dB
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Operating temperature range < ± 0,5 dB
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-25 ... +70 °C
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Main ambient temperature coefficient
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≤0,01 dB/K
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Main ambient pressure coefficient
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1 x 10-5 dB/Pa
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Influence of relative humidity 30 % to 90 %
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< 0,1 dB
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Temperature limits
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-50 °C … +100 °C
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Humidity limits
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r. H < 100 %; absence of condensation
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Diameter
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with protection grid
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13,2 + 0,05 mm
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without protection grid
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12,7 + 0,05 mm
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Length, including connector
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97 mm
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Weight
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45 g
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Preamplifier thread
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11,7 mm 60 UNS
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Protection grid thread
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12,7 mm 60 UNS
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Plug
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BNC
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Microphone identification memory
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256-Bit 1-Wire™ EEPROM (DS 2430 AP)
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Frequency Responses
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Measuring microphone MM 210
in wooden case L x B x H 127 x 87 x 55 mm |
Order-No. 318005
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