scope:

The standard specifies a survey method for measuring the wei ghted sound pressure levels at prescribed microphone positio ns around a noise source. The A-weighted sound power level o f the source is calculated from the measured values.This met hod may be applied in situ to sources which cannot be moved to a special test environment and to which the methods speci fied in ISO 3741, ISO 3742, ISO 3743, ISO 3744 and ISO 3745 cannot be applied or should not be applied because they requ ire too much effort.