½"漫射场/RANDOM 事件 麦克风
外偏振漫射场麦克风，专为3.15 Hz至10kHz的Random入射测量而设计，并经过ANSI标准认证，可用于噪声测量。
TYPE 4943
4943型针对一般Random入射测量和符合ANSI标准的噪声测量进行了优化。外部极化，必须与经典前置放大器一起使用
| Diffuse-field ½-inch Microphone Type 4943 Datasheet (bp1876) | Data Sheets | English |
| Standard | ANSI S1.4 |
| Sound field | Diffuse field |
| Polarization voltage | 200V |
| Sensitivity | 50 mV/Pa |
| Lower limiting frequency | 3.15 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 |
A diffuse-field microphone, also called a random-incidence microphone, is designed to have a uniform response when signals arrive simultaneously from all angles.
They should therefore not only be used for measurement in reverberation chambers, but in all situations where the sound field is diffuse, or where several sources are contributing to the sound pressure at the measurement position.
Practical examples are indoor situations, where the sound is reflected by walls, ceilings, and objects in the room, or measurements inside a car.
The microphone is capable of withstanding the IEC 68-2-32 1 metre drop test.
The sensitivity can be calibrated at 250 Hz by using Pistonphone Type 4229 with our ½-inch Adaptor DP 0776, or at 1 kHz using Sound Calibrator Type 4231. For other frequencies, we recommend using Multifunction Acoustic Calibrator Type 4226.
The actuator response can be measured using Actuator UA-0033.
The random-incidence response can be obtained by adding the type-specific, random-incidence correction 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.
