MK251 1/2-inch Pressure-field Microphone
MK251 is the
1/2-inch pressure-field microphone developed by BSWA. It is suitable for
pressure-field environments such as in cavity, near a hard reflective surface,
or installed flush with a hard surface. It needs 200 V polarization voltage,
and suitable for MV211 preamplifier (optional TEDS).
MK251 is
side-vented and can measure the sound pressure level up to 160 dB in the
frequency range of 3.15 Hz ~ 20 kHz.
MK251 has a redesigned microphone structure with nickel metal diaphragm and high nickel alloy housing with the same expansion coefficient, which can effectively improve the temperature stability of the microphone and have excellent corrosion resistance.
MK251 can choose a preamplifier with TEDS to support data acquisition equipment to read microphone information directly, including microphone model, serial number, sensitivity, etc. BSWA microphone supports the IEEE 1451.4 standard. The v0.9 version is used by default to be compatible with more data acquisition equipment. The v1.0 version can also be selected according to user’s requirements.
Each MK251 is supplied with an individual calibration data chart including sensitivity, frequency response and so on.
Features:
● 1/2-inch pressure-field microphone
● Sensitivity (@250 Hz) :12.5 mV/Pa (-38 dB re 1 V/Pa)
● Frequency response: 5 Hz ~ 8 kHz (±1 dB)
3.15 Hz ~ 20 kHz (±2 dB)
● Dynamic range: 22 dBA ~ 160 dB
● Polarization voltage: 200 V
● Pressure equalization: side-vented
● Suitable for 1/2-inch preamplifier with ICCP power supply
● Optional TEDS (IEEE.1451.4)
Applications:
● High-precision common acoustic measurements.
● Reference microphone for sound calibration.
Specifications：
| Sound Field | Pressure-field | |
|---|---|---|
| Diameter | 1/2" | |
| Open-circuit Sensitivity@250 Hz (mV/Pa) (±2 dB) | 12.5 (-38 dB re 1 V/Pa) | |
| Polarization Voltage | 200 V | |
| Frequency Response (Hz) | 5 ~ 8 k (±1 dB), 3.15 ~ 20k (±2 dB) | |
| Dynamic Range (dBA ~ dB) | 22 ~ 160 | |
| Cartridge Thermal Noise (dBA) | 22 | |
| Maximum Sound Pressure Level (dB) (3% distortion) | 160 | |
| Capacitance (pF) | 10 | |
| Equivalent Air Volume@250 Hz (mm3) | 9 | |
| Pressure Equalization Vent | Side-vented | |
| Operating Temperature Range (°C) | -30 ~ 80 | |
| Operating Humidity Range (%RH) | 0 ~ 98 | |
| Temperature Coefficient (250 Hz) (dB/°C) | -0.02 | |
| Pressure Coefficient (250 Hz) (dB/kPa) | -0.01 | |
| Influence of Humidity (dB) | <0.1 | |
| Standard | IEC 61094-4 Type WS2F | |
| Dimensions (mm) | with Grid | Ø13.2 × 13.7 |
| without Grid | Ø12.7 × 12.6 | |
| Mounting Thread for Preamplifier | 11.7 mm-60 UNS | |
| Weight (g) | 6.1 | |
| Suitable Preamplifier | MV211 (Optional TEDS, IEEE 1451.4 v0.9 / v1.0) | |
Download information:
MK251 1/2-inch Pressure-field Microphone Brief
