MK451S 1/4-inch Pressure-field Microphone
MK451S is the 1/4-inch pressure-field microphone developed by BSWA. It is suitable for the pressure field environments such as in a cavity, near a hard reflective surface, or installed flush with a hard surface. It needs 200 V polarization voltage, and suitable for MV411 preamplifier (optional TEDS).
MK451S is side-vented and can measure the sound pressure level up to 168 dB in the frequency range of 8 Hz ~ 70 kHz.
MK451S 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.
MK451S 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 MK451S is supplied with an individual calibration data chart including sensitivity, frequency Responseand so on.
Features:
● 1/4-inch pressure-field microphone
● Sensitivity (@250 Hz): 1.6 mV/Pa (-56 dB re 1V/Pa)
● Frequency response: 8 Hz ~ 70 kHz (±2 dB)
● Dynamic range: 38 dBA ~ 168 dB
● Polarization voltage: 200 V
● Pressure equalization: side-vented
● Suitable for 1/4-inch preamplifier with 200 V power supply
● Optional TEDS (IEEE.1451.4)
Applications:
● High sound pressure measurements
● High frequency noise measurements
Specifications：
| Sound Field | Pressure-field | |
|---|---|---|
| Diameter | 1/4" | |
| Open-circuit Sensitivity@250 Hz (mV/Pa) (±3 dB) | 1.6 (-56 dB re 1V/Pa) | |
| Polarization Voltage | 200 V | |
| Frequency Response (Hz) | 8 ~ 70 k (±2 dB) | |
| Dynamic Range (dBA ~ dB) | 38 ~ 168 | |
| Cartridge Thermal Noise (dBA) | 38 | |
| Maximum Sound Pressure Level (dB) (3% distortion) | 168 | |
| Capacitance (pF) | 6 | |
| Equivalent Air Volume@250 Hz (mm3) | 0.3 | |
| Pressure Equalization Vent | Side-vented | |
| Operating Temperature Range (°C) | -30 ~ 80 | |
| Operating Humidity Range (%RH) | 0 ~ 95 | |
| Temperature Coefficient (250 Hz) (dB/°C) | -0.02 | |
| Pressure Coefficient (250 Hz) (dB/kPa) | -0.01 | |
| Influence of Humidity (dB) | <0.1 | |
| Dimensions (mm) | with Grid | Ø7 × 10.2 |
| without Grid | Ø6.35 × 9.4 | |
| Mounting Thread for Preamplifier | 5.7 mm-60UNS | |
| Weight (g) | 1.7 | |
| Suitable Preamplifier | MV411 | |
| TEDS | Optional, IEEE 1451.4 compliant (default v0.9, optional v1.0) | |
Download information:
MK451S 1/4-inch Pressure-field Microphone Brief
