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Calibration must be done to be able to measure the correct sound pressure level (SPL). To do the calibration, please go through the calibration procedure found in the help file. (In principle calibration to obtain absolute levels is not required for this type of measurement since the main result is found as a difference between levels. But according to the standard the input chain must be calibrated.)
According to ISO 140-4:1997, the accuracy of the sound level measurement equipment shall comply with the requirements of accuracy class 0 or 1 defined in IEC60651 and IEC60804. Use a sound calibrator to adjust the complete measuring system including the microphone before each measurement unless otherwise stated. The sound calibrator must comply with the requirements of accuracy class 1 defined in IEC60942.
We sell a complete solution that includes such equipment, contact us for more information.
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