1/8“压力场传声器，外部极化
压力场传声器，专为在受限空间中进行非常高频率的测量而设计，频率范围为6 Hz至140 kHz。
4138 系列
4138型专为高声级和极高频率测量以及在狭小空间中的测量而设计。由于是外部极化，4138型必须与经典的前置放大器一起使用。
| 1/8-inch Pressure-field Microphone Type 4138 | Data Sheets | English |
| Standard | IEC 61094 |
| Sound field | Pressure field |
| Polarization | Classical |
| Sensitivity | 0.56 mV/Pa, 0.8 mV/Pa |
| Lower frequency | 6.5 Hz |
| Higher frequency | 140 kHz |
| Lower dynamic range | 52.2 dB |
| Higher dynamic range | 168 dB |
| Diameter | 1/8 inch |
| Venting | Side |
| Minimum Temperature | -30 °C |
| Maximum Temperature | 100 °C |
| Minimum Temperature | -22 °F |
| Maximum Temperature | 212 °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.