1/8 "圧力フィールドマイクロスコープ、外部偏光
1/8 "圧力フィールドマイクロスコープ、外部偏光
圧力フィールドマイクロスコープは、6.5 Hz～140 kHzの狭い空間での超高周波測定用に設計されています。
TYPE 4138
TYPE4138は高レベル、超高周波の測定や狭い場所での測定用に設計されています。TYPE4138は外部偏極型であるため、クラシックタイプのプリアンプと組み合わせて使用する必要があります。
| Document | タイプ | 言語 |
|---|---|---|
| 1/8-inch Pressure-field Microphone Type 4138 | データシート | English |
| プロパティ | 値 |
|---|---|
| Standard | IEC 61094 |
| Sound field | Pressure field |
| Polarization voltage | 200V |
| Sensitivity | 1 mV/Pa |
| Lower limiting frequency | 6.5 Hz |
| Higher limiting frequency | 140 kHz |
| Inherent noise | 43 dB(A) |
| Upper limiting of dynamic range | 168 dB |
| Diameter | 1/8 inch |
| Venting | Side |
| Minimum Temperature | -30 °C |
| Maximum Temperature | 100 °C |
| Minimum Temperature | -22 °F |
| Maximum Temperature | 212 °F |
Pressure-field microphones should be used for making measurements in small, closed couplers or close to hard, reflective surfaces. Such microphones are optimised to have a flat frequency response in a pressure field. Because of its small size, Type 4138 can also be used for random-incidence measurements at audio frequencies, where its frequency response is less dependent on angle of incidence.
Type 4138 requires an external polarization voltage and therefore must be used with a classical preamplifier such as Brüel & Kjær Type 2670 together with 1/8-inch to 1/4-inch Adaptor UA-0160.
The sensitivity of Type 4138 can be calibrated at 250 Hz using Pistonphone Type 4228, or at 1 kHz using Sound Calibrator Type 4231, in both cases using Adaptor DP-0774.
The pressure-field response can be measured using Electrostatic Actuator UA-0033 with Actuator Adaptor DB-0900.
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