"1/2 "拡散フィールドマイクロスコープ/ランダム 発生 マイク
外部偏極型拡散フィールドマイクロスコープは、3.15 Hz～10 kHzのランダム入射測定用に設計されており、ANSI規格に準拠したノイズ測定用として認可されています。
TYPE 4943
TYPE4943は、一般的なランダム入射測定とANSI規格に準拠したノイズ測定用に最適化されています。外部偏光であるため、古典的なプリアンプと併用する必要があります。
| Document | タイプ | 言語 |
|---|---|---|
| Diffuse-field ½-inch Microphone Type 4943 Datasheet (bp1876) | データシート | English |
| プロパティ | 値 |
|---|---|
| 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.
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