4231型声学校准器是声级计和其他声学测试设备校准的手持式和便携式声源。

用途：

      声级计或其它声学仪器的校准

特点：

      符合EN/IEC 60942（2003）LS级和1级，和ANSI s1.40–1984标准

      稳定的频率

      校准精度±0.2分贝

      94分贝或114分贝SPL，在嘈杂的环境中的校准

      静态压力和温度的对校准影响很小

  适合B&K 1“和1 / 2“麦克风（1 / 4“和1 / 8“麦克风适配器）

  从麦克风拔出时自动关闭

参数：

标准	IEC 942 (1998) Class 1
校准压力	94 and 114 dB SPL
校准频率	1000 Hz
校准精度	± 0.2 dB
传感器	1-inch and 1/2-inch

Sound Level Calibrator — 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 ±0.2dB
❍ 94dB SPL, or 114dBSPL for calibration in noisy
environments
❍ Extremely small influence of static pressure
❍ Sound pressure independent of microphone
equivalent volume
❍ 1kHz 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
USES:
❍ Calibration of sound level meters and other sound
measurement equipment

The Sound Level Calibrator Type

4231 is a handy, portable sound source
for calibration of sound level meters
and other sound measurement equip-
ment. The calibrator is very robust and
stable and conforms to IEC942 Class
1 and ANSIS1.40-1984.
The Sound Level Calibrator Type
4231 is a pocket-sized, battery oper-
ated sound source for quick and di-
rect calibration of sound level meters
and other sound measuring systems.
It fits Brüel&Kjær 1″ and 1/2″ micro-
phones and, with adaptors, it can be
used for 1/4″ and 1/8″ microphones as
well.
The
calibration
frequency
is
1000Hz (the reference frequency for
the
standardized
international
weighting networks), so the same cal-
ibration value is obtained for all
weighting networks (A, B, C, D and
Linear). The calibration pressure of
94 ±0.2dB re 20µPa is equal to 1Pa
or 1N/m2. The +20dB level step gives
114dB SPL which is convenient for
calibration in noisy environments.