百度推荐深圳声仪科技有限公司供应深圳BK4231音校准器传声器校正器，94DB传声器校准器，传声器1/2英寸，1/4英寸，1/8英寸. FEATURES: ❍ Conforms to IEC942 (1988) Class 1 and ANSI S1.40–1984 (R1997) ❍ Robust pocket-size design with highly stable level and frequency ❍ Calibration accuracy ±0.2 dB ❍ 94 dB SPL, or 114 dB SPL for calibration in noisy environments ❍ Extremely small influence of static pressure ❍ Sound pressure independent of microphone equivalent volume STANDARDS SATISFIED: IEC 942 (1988), Sound Calibrators, Class 1 ANSI S1.40–1984 (R 1997), Specifications for Acoustic Calibrators NOMINAL SOUND PRESSURE LEVEL: 94.0 dB ±0.2 dB or 114.0 dB ±0.2 dB re 20 mPa at reference conditions FREQUENCY: 1kHz ±0.1% SPECIFIED MICROPHONE TYPES: (Conforms to IEC 942 Class 1) Brüel &Kjær (and similar types) 1² and 1/2², 1/4², 1/8² with adaptors 本公司地址：广东深圳深圳市宝安区海城路白金假日