Internal calibration definition

Internal calibration means calibration of the sound level meter by an internal oscillator or other means. The sound level meter internal calibration may be used, provided that the overall response of the sound level meter and microphone are evaluated by an external acoustic calibrator meeting the requirements of paragraph (a) (3) at the start and at the end of each test day.

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Examples of Internal calibration in a sentence

• Nitrate as N: Initial calibration: Every 6 months Calibration verification: Once per batch Ortho- phosphate: Once per batch ▇▇▇▇ ▇▇ Creek Environmental Lab: Dissolved Metals Creek Environmental Laboratory SOP Internal calibration.