  MP201 : microphone is the best choice for use in IEC61672
Class 1 Sound Level Meters and other noise measurements
requiringClass1
accuracy. It is a 1/2" prepolarized freefield measurement
microphone whose development spans over 30 years in
design,
manufacture, calibration, and field testing. The microphone
housing and diaphragm are also made from the same nickel
alloy to ensure the smallest temperature coefficients.
Production quality control for the MP201 uses only 40% of the
frequency response tolerances al lowed by IEC61672 Class 1
microphones.
Figure below shows the typical free-field frequency response
curve of the MP201 (black curve) against quality control limits
(red curves).  MP231 : microphone uses stainless steel as protection grid,
which makes the microphone stronger and firmer.
The MP231 conforms to IEC61672 Class 1 standard with a
sensitivity of 40mv/Pa. The MP231 is perfect for its long-term
stability.
|
SPECIFICATIONS
| FREE FIELD MICROPHONES MP201/MP231 |
| Model |
MP201 |
MP231 |
| Diaphragm Material |
Nickel |
Nickel |
| Housing Material |
Aloy |
Aloy |
| Open-Circuit Sensitivity |
-26 dB±2 dB
(50 mV/Pa) |
-28 dB±3 dB
(40 mV/Pa) |
| Capacitance (Typical) |
16 pF |
16 pF |
| Diameter |
1/2 inch |
| Response |
Free Field |
| Polarization Voltage |
0 V |
| Frequency Response |
6.3 Hz ~ 20 kHz |
Dynamic Range
(3% Distortion Limit) |
> 146 dB |
| Cartridge Thermal Noise |
< 16 dB (A) |
| Pressure Equalization Vent |
Rear Vented |
| Operating Temperature |
-30°C ~ 80°C |
| Operating Humidity |
0 ~ 98% RH |
| Equivalent Air Volume |
250 mm3 at 250 Hz |
Temperature Coefficient
(-10°C ~ 50°C) |
- 0.005 dB/°C |
| Humidity Coefficient |
- 0.003 dB/%RH |
Pressure Coefficient
(250 Hz) |
- 0.004 dB/kPa |
| Dimensions |
IEC 61094-4 Type WS 2 |
|
