Microphone MMS 214 with high sensitivity 320 mV/Pa
and low self-noise level below 6.5 dBA
The 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).
- Sensitivity: 320 mV/Pa
- free-field
- 2 Hz to 20 kHz
- 6.5 dBA to 104 dB
- IEPE (BNC)
- Microphone power supply: IEPE
- TEDS acc IEEE 1451
- Price : RFQ
Technical Data
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) |
Recommended 24 bit measurement data acquisition
RogaDAQ4 IEPE ADC self-noise related to 320 mV/Pa microphone sensitivity is at 3.5 dBA.
- Noise floor 3.5 dBA @ 320 mV/Pa
- Four high precision inputs with 24 bit ADC
- 8 .. 192kS/s selectable sample rate
- Integrated anti alias filter ensures perfect signal integrity
- AC, DC coupling or IEPE for direct power supply
- 5 Volt power supply
- Rugged aluminum case
- Drivers: DASYLab, LabView, DiaDem