Sound Level Calibrator 音校准器— Type 4231

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

❍ 1 kHz calibration frequency for correct calibration
level independent of weighting networks
❍ Fits Brüel &Kjær 1″ and 1/2 ″ microphones (1/4″ and
1/8″ microphones with adaptor)
❍ Switches off automatically when removed from the
microphone

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%