The Bruel Kjaer 4231 belongs to the kategory Calibrators .
- Robust, pocket-sized design with highly stable level and frequency
- Calibration accuracy +- 0.2 dB
- Extremely small influence of static pressure and temperature
- sound pressure independent of microphone equivalent volume
- 1kHz calibration frequency for correct calibration level independent of weighting networks
- Switches off automatically when removed fro
- Conforms to EN/IEC 60942 (2003) Class LS and Class 1, and ANSI S1.40-1984m