1/2" INFRASOUND MICROPHONE, PREPOLARIZED
1/2" INFRASOUND MICROPHONE, PREPOLARIZED0.02Hzから20kHzの周波数帯域で高感度、高精度の音響測定用に特別に設計されたマイクロホンです。
TYPE 4964
4964型マイクロフォンカートリッジは、高感度の低周波マイクロフォンを必要とする高精度の音響測定用に設計されています。TYPE4964は偏極型であるため、CCLDとクラシックプリアンプの両方で使用することができ、特にバッテリー駆動の機器や湿度の高い環境での使用に適しています。
| Document | タイプ | 言語 |
|---|---|---|
| ½ inch Prepolarized Infrasound Microphone Type 4964 | データシート | English |
| プロパティ | 値 |
|---|---|
| Standard | IEC 61094 |
| Sound field | Free field |
| Polarization voltage | 0V |
| Sensitivity | 50 mV/Pa |
| Lower limiting frequency | 0.02 Hz |
| Higher limiting frequency | 20 kHz |
| Inherent noise | 14.2 dB(A) |
| Upper limiting of dynamic range | 146 dB |
| Diameter | 1/2 inch |
| Venting | Rear |
| Minimum Temperature | -30 °C |
| Maximum Temperature | 150 °C |
| Minimum Temperature | -22 °F |
| Maximum Temperature | 302 °F |
At infrasound and frequencies below a few kHz, the pressure and free-field response are the same. At higher frequencies, reflections and diffractions cause pressure to increase in front of a microphone's diaphragm.
Type 4964 has been optimized for free-field, and designed for use with the protection grid in place. Type 4964 is also suited for use in class 1 sound level meters and for all high-precision acoustic measurements where a robust and stable free-field microphone with an upper frequency of 20 kHz is required.
A press-fitted, stainless-steel diaphragm ensures superior longterm stability and mechanical robustness – Type 4964 will withstand the 1 m drop test of IEC 60068–2–32.
As all Brüel & Kjær microphones, each Type 4964 is provided with an individual calibration chart including information about the open-circuit sensitivity, the frequency response in a free field as well as the electrostatic actuator response. Using the calibration data and the REq-X feature of LAN-XI, a real-time correction for different measurement situations can increase accuracy.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, MicroStrain and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
