MK401S 1/4-inch Free-field Microphone
MK401S is the 1/4-inch free-field microphone developed by BSWA. It is suitable for measurement in free-field and semi free-field environments with minimal sound reflection. It needs 200 V polarization voltage, and suitable for MV411 preamplifier (optional TEDS).
MK401S is side-vented and can measure the sound pressure level up to 158 dB in the frequency range of 8 Hz ~ 50 kHz.
MK401S 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.
MK401S 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 MK401S is supplied with an individual calibration data chart including sensitivity, frequency response and so on.
Features:
● 1/4-inch free-field microphone
● Sensitivity (@250 Hz): 4 mV/Pa (-48 dB re 1V/Pa)
● Frequency response: 8 Hz ~ 50 kHz (±2 dB)
● Dynamic range: 38 dBA ~ 158 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 | Free-field | |
|---|---|---|
| Diameter | 1/4" | |
| Open-circuit Sensitivity@250 Hz (mV/Pa) (±3 dB) | 4 (-48 dB re 1V/Pa) | |
| Polarization Voltage | 200 V | |
| Frequency Response (Hz) | 8 ~ 50 k (±2 dB) | |
| Dynamic Range (dBA ~ dB) | 38 ~ 158 | |
| Cartridge Thermal Noise (dBA) | 38 | |
| Maximum Sound Pressure Level (dB) (3% distortion) | 158 | |
| Capacitance (pF) | 6 | |
| Equivalent Air Volume@250 Hz (mm3) | 0.6 | |
| 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:
MK401S 1/4-inch Free-field Microphone Brief
