1/2インチ拡散フィールドマイクロスコープ、プリポラライズド
1/2インチ拡散フィールドマイクロスコープ、プリポラライズド
6Hz～16kHzのランダム入射（拡散フィールド）測定用に特別に設計された拡散フィールドマイクロフォンカートリッジで、ANSI規格に準拠したノイズ測定が可能です。
TYPE 4942
4942型前偏極拡散フィールド1/2インチマイクロホンは、一般的なランダム入射測定およびANSI規格に準拠した標準騒音測定用に最適化されています。また、プリポラライズされているため、CCLD入力コンディショニングに接続することができます。
| Document | タイプ | 言語 |
|---|---|---|
| Product Data: ½'' Prepolarized Diffuse-field Microphone Type 4942 | データシート | English |
| プロパティ | 値 |
|---|---|
| Standard | ANSI S1.4 |
| Sound field | Diffuse field |
| Polarization voltage | 0V |
| Sensitivity | 50 mV/Pa |
| Lower limiting frequency | 4 Hz |
| Higher limiting frequency | 16 kHz |
| Inherent noise | 14.6 dB(A) |
| Upper limiting of dynamic range | 146 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 flat response when signals arrive simultaneously from all directions. 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 contribute 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 4228 with ½-inch Adaptor DP 0776. 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. Please note that this microphone is not suitable for pressure-field measurements.
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