1/2“自由场传声器，预极化
自由场传声器设计用于在6.5 Hz至16 kHz的频率范围内进行精确声学测量（IEC 61672 1级和ANSI S 1.4 类型1）。
4950 型
这种预极化、自由场 ½ 英寸传声器专为根据 IEC 61672 1级和 ANSI S 1.4 第 1 类标准进行准确可靠的声学测量设备而设计。
| Standard | IEC 61672 |
| Sound field | Free field |
| Polarization voltage | 0V |
| Sensitivity | 50 mV/Pa |
| Lower limiting frequency | 6.5 Hz |
| Higher limiting frequency | 16 kHz |
| Inherent noise | 15 dB(A) |
| Upper limiting of dynamic range | 142 dB |
| Diameter | 1/2 inch |
| Venting | Rear |
| Minimum Temperature | -30 °C |
| Maximum Temperature | 100 °C |
| Minimum Temperature | -22 °F |
| Maximum Temperature | 212 °F |
½-inch Free-field Microphone Type 4950 is a prepolarized condenser microphone, designed for accurate and reliable sound measurements as required for sound level meters in accordance with IEC 61672 Class 1 and ANSI S 1.4 Type 1.
The use of a stainless-steel, press-fit mounted diaphragm guarantees both robustness and corrosion resistance. The microphone is fitted with a removable protection grid. It does not need an external polarization voltage, thus eliminating the need for cumbersome high-voltage DC supplies and at the same time enabling the use of inexpensive 2-wire system (CCLD) input.
The microphone is rear-vented in order to balance out the static pressure; the venting also determines the lower limiting frequency. Type 4950 comes with a calibration chart showing typical frequency response and individual sensitivity value.
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.