Sound Level Meters
Calibrations of sound level meters are performed according to standards IEC 61672, BS 7580, ANSI S1 4, and ANSI S1.43. Procedures include tolerances and are designed to verify that the characteristics of the sound level meter are correct. Examples of characteristics tested: frequency response of microphone and filter, the time weightings (Fast, Slow, etc.), level linearity, over range indication, etc.
Sound level meters are divided into different classes of accuracy, where class 1 is intended for precision measurements and class 2 for simple measurements. Approximate accuracy for a sound level meter of class 1 is 1 dB and 2 dB for class 2.
SIRIUS as SLM
SIRIUS DAQ system can be calibrated using the procedure for class 1 SLM in accordance with IEC 61672, when used for sound power measurements.