1/4-INCH PRESSURE-FIELD MICROPHONE, EXTERNALLY POLARIZED
圧力フィールドマイクロスコープで、4 Hz～70 kHzの高音域と高周波の測定が可能
。
TYPE 4938
4938型圧力フィールド1/4インチマイクロホンは、高音域と高周波の測定用に設計されています。マイクは乱暴な取り扱いや最高300℃の高温にも耐えられるよう設計されています。
| Document | タイプ | 言語 |
|---|---|---|
| 1/4'' Pressure-field Microphone Type 4938 | データシート | English |
| TEDS Microphones | データシート | English |
| TEDS Microphones | データシート | Japanese |
| プロパティ | 値 |
|---|---|
| Standard | IEC 61094 |
| Sound field | Pressure field |
| Polarization voltage | 200V |
| Sensitivity | 1.6 mV/Pa |
| Lower limiting frequency | 4 Hz |
| Higher limiting frequency | 70 kHz |
| Inherent noise | 30 dB(A) |
| Upper limiting of dynamic range | 172 dB |
| Diameter | 1/4 inch |
| Venting | Side |
| Minimum Temperature | -40 °C |
| Maximum Temperature | 300 °C |
| Minimum Temperature | -40 °F |
| Maximum Temperature | 572 °F |
The shape of the microphone front ensures excellent microphone performance when flush-mounted and the laser-welded diaphragm on the microphone housing ensures that the sensitivity is resistant to rough handling during flush mounting. The robustness of the microphone makes it capable of withstanding the IEC 68-2-32 1 metre drop.
The sensitivity can be calibrated at 250 Hz using Pistonphone Type 4228 with ¼-inch Adaptor DP 0775. The pressure-field response can be measured using Actuator UA 0033 with Adaptor DB 0264. The pressure-field response is equal to the actuator response.
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