Noise meter automatic proofreading manner and its system

摘要

The present invention provides a method and a system for automatically calibrating a sound level meter which achieves accurate and secure calibration of a sound level meter. The system is for automatically calibrating a sound level meter (2) by using a sound calibrator (1), The sound calibrator (1) comprises a code signal generating means (11) and a calibration sound pressure generating means (12). The sound level meter (2) comprises a code signal discriminating means (25), a mode switching means (26) for switching the mode into a calibration mode in response to the discrimination of the code signal discriminating means (25), a gain adjusting means (27) for adjusting a gain of the amplifier (22) such that the indicated value corresponds to the level of the calibration sound pressure in the calibration mode and a calibration recording means (28) for recording the calibration date and time, the sound pressure, the type and the manufacturing number of the sound calibrator (1).