1/2 "フリーフィールドマイクロスコープ、 プリポラライズド
1/2 "フリーフィールドマイクロスコープ。
6.5Hzから16kHzの周波数帯域で正確な音響測定（IEC 61672 Class 1およびANSI S 1.4 Type 1）用に設計されたフリーフィールドマイクロスコープ
TYPE 4950
この偏極型フリーフィールド1/2インチマイクロホンは、IEC 61672 Class 1およびANSI S 1.4 Type 1.
に準拠した、正確で信頼性の高い音響測定を目的とした機器用に特別に設計されています。| Document | タイプ | 言語 |
|---|---|---|
| ½-inch Prepolarized Free-field Microphone Type 4950 | データシート | English |
| プロパティ | 値 |
|---|---|
| Standard | IEC 61672 |
| Sound field | Free field |
| Polarization voltage | 0V |
| Sensitivity | 50 mV/Pa |
| Lower limiting frequency | 6.5 Hz |
| Higher limiting frequency | 16 kHz |
| Inherent noise | 15 dB(A) |
| Upper limiting of dynamic range | 142 dB |
| Diameter | 1/2 inch |
| Venting | Rear |
| Minimum Temperature | -30 °C |
| Maximum Temperature | 100 °C |
| Minimum Temperature | -22 °F |
| Maximum Temperature | 212 °F |
½-inch Free-field Microphone Type 4950 is a prepolarized condenser microphone, designed for accurate and reliable sound measurements as required for sound level meters in accordance with IEC 61672 Class 1 and ANSI S 1.4 Type 1.
The use of a stainless-steel, press-fit mounted diaphragm guarantees both robustness and corrosion resistance. The microphone is fitted with a removable protection grid. It does not need an external polarization voltage, thus eliminating the need for cumbersome high-voltage DC supplies and at the same time enabling the use of inexpensive 2-wire system (CCLD) input.
The microphone is rear-vented in order to balance out the static pressure; the venting also determines the lower limiting frequency. Type 4950 comes with a calibration chart showing typical frequency response and individual sensitivity value.
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