下面列出B&K公司在噪声测量中对声压级校准的描述: Calibration
Sound level meters should be calibrated in order to provide precise and accurate results. This is best done by placing a portable acoustic calibrator, such as a sound level calibrator or a pistonphone, directly over the microphone. These calibrators provide a precisely defined sound pressure level to which the sound level meter can be adjusted. It is good measurement practice to calibrate sound level meters immediately before and after each measurement session. If recordings are to be made of noise measurements, then the calibration signal should also be recorded to provide a reference level on playback.
并有附图,图中给的是活塞发生器,在某一频率下产生标准声压: