½英寸压力场传声器，预极化，8 HZ – 10 KHZ
压力场传声器专为在8 Hz至10 kHz的频率范围内进行电话和助听器测试相关的耦合腔测量而设计。
4947 型
4947型预极化½英寸传声器针对压力场测量进行了优化，例如耦合腔测量，靠近硬反射表面，在与波长相比较小的封闭空间或空腔中进行测量。
例如，在电话和助听器测试方面。传声器预极化，可连接到CCLD输入适调器。传声器可承受IEC 68-2-32 1米跌落测试。
| Sound field | Pressure field |
| Polarization voltage | 200V |
| Sensitivity | 50 mV/Pa |
| Lower limiting frequency | 8 Hz |
| Higher limiting frequency | 10 kHz |
| Inherent noise | 15.5 dB(A) |
| Upper limiting of dynamic range | 148 dB |
| Diameter | 1/2 inch |
| Venting | Rear |
| Minimum Temperature | -40 °C |
| Maximum Temperature | 150 °C |
| Minimum Temperature | -40 °F |
| Maximum Temperature | 302 °F |
The sensitivity can be calibrated at 250 Hz by using Pistonphone Type 4228 with ½-inch Adaptor DP 0776. The actuator response can be measured using Electrostatic Actuator UA 0033.
The pressure-field response can be obtained by adding the relevant correction curve to the actuator response.
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.