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Low noise microphone suitable for DIN EN ISO 7779 tests

Low noise microphone MMS 214 has a particularly low inherent noise level and is designed for acoustic measurements of low sound pressure levels close to the threshold of human hearing. 

The electrical connection is via a BNC cable to devices with IEPE supply. 

The microphone preamplifier internally generates the polarization voltage for the externally polarized microphone capsule. 

The measurement microphone is equipped with a build-in memory for microphone identification (TEDS acc. IEEE 1451).

MMS 214

low noise microphone

Low Noise Microphone

  • Sensitivity: 320 mV/Pa
  • Free-field
  • 2 Hz to 20 kHz
  • 6.5 dBA to 104 dB
  • IEPE (BNC)
  • Microphone power supply: IEPE
  • Class 1 – WS2F – IEC 61094-4
  • TEDS acc IEEE 1451
Transducer type
Capacitive pressure transducer
Frequency range
of the free field response
±2 dB 2.5 Hz to 16 kHz
±3 dB 2.0 Hz to 20 kHz
Sensitivity
320 mV/Pa
Sensitivity re 1 V/Pa
-10 dB ± 2.5 dB
Max. SPL for 3% THD at 1 kHz
Peak, 20 Hz to 5 kHz 116 dB
Peak, 20 Hz to 20 kHz 104 dB
RMS, 20 Hz to 5 kHz 113 dB
RMS, 20 Hz to 20 kHz 101 dB
Inherent noise
6.5 dBA
Output impedance
<100 Ohm
Current consumption
4 mA to 20 mA
Power supply voltage
24 V DC to 30 V DC
Temperature range, operation
-20 °C bis +60 °C
Temperature range, storage
-40 °C to +80 °C
Temperature coefficient at 250 Hz
≤0.01 dB/K
Static pressure coefficient at 250 Hz
-0.00001 dB/Pa
Temperature limits
-50 °C to +100 °C
Humidity limits
r.H. <100%, absence of condensation
Diameter
without protection grid 12.7 mm ± 0.05 mm
with protection grid 13.2 mm ± 0.05 mm
Length
135 mm
Weight
250 g
Plug
BNC
Microphone identification memory
256-Bit 1-WireTM EEPROM (DS 2430 AP)