HD 556 S1:1991

Sound calibrators

Scope

This standard specifies the performance requirements for three classes of sound calibrator: Class 0, Class 1, and Class 2 in decreasing order of accuracy under specified conditions - Instruments for use only over a reduced range of environmental conditions are distinguished by the marking "L" - The term "class" designates the degrees of accuracy of the sound calibrator itself nor with the calibration of any measuring device or system with which the sound calibrator may be used