1/4"自由场传声器，外部极化
专为在 4 Hz 至 100 kHz 频率范围内进行高声级和高频测量设计的自由场传声器。
4939 系列
使用不锈钢振膜和保护格栅4939型传声器专为承受恶劣环境而设计，可用于高达150°C（302°F）的高温测量。
该传声器需要外部极化电压，因此必须与经典的前置放大器一起使用。外部极化传声器可以在较高温度下使用，而不会对测量灵敏度产生严重影响。
| Code | 灵敏度 |
|---|---|
| -4939-A-011- | 4 mV/Pa |
| -4939-C-002- | 3.5 mV/Pa |
| -4939-L-002- | 3.5 mV/Pa |
| TEDS Microphones | Data Sheets | English |
| TEDS Microphones | Data Sheets | Japanese |
| Standard | IEC 61094 |
| Sound field | Free field |
| Polarization | Classical |
| Sensitivity | 3.5 mV/Pa, 4 mV/Pa |
| Lower frequency | 4 Hz |
| Higher frequency | 100 kHz |
| Lower dynamic range | 35 dB |
| Higher dynamic range | 164 dB |
| Diameter | 1/4 inch |
| Venting | Side |
| Minimum Temperature | -20 °C |
| Maximum Temperature | 80 °C |
| Minimum Temperature | -4 °F |
| Maximum Temperature | 176 °F |
| Output signal (connectivity) | Passive |
The unit is assembled in a clean-room environment and sealed together, after which it is assigned one single type number and one single serial number. This means that the combined unit has better precision and long-time stability, and is handled as one complete unit.
The unit also contains TEDS, which means that information about the serial number, type and sensitivity is stored within it.
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.
