1/2"自由场传声器，预极化
用于户外和工业环境测量以及从2 Hz到20 kHz的频率分析的自由场传声器。
4940 型
4940型预极化的自由场½英寸传声器在与便携式仪器一起使用时具有显著优势。它特别适合户外和工业环境测量。它也适用于IEC 60651 类型1测量和频率分析测量。
该传声器能够承受 IEC 68 232 1 米跌落测试。
使用活塞发生器 4228 型和 ½ 英寸适配器 DP 0776，可以在 250 Hz 校准灵敏度。使用激励器 UA 0033 可以测量激励器响应。通过将特定类型、自由场校正值添加到激励器响应中，可以获得自由场响应。
| Standard | IEC 61094 |
| Sound field | Free field |
| Polarization voltage | 0V |
| Sensitivity | 50 mV/Pa |
| Lower limiting frequency | 6.3 Hz |
| Higher limiting frequency | 20 kHz |
| Inherent noise | 14.6 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 |
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.