scope:

This part of IEC 60645 applies to instruments designed primarily for the measurement of otoacoustic emissions in the human external acoustic meatus evoked by acoustic probe pulses or tones. The standard defines the characteristics to be specified by the manufacturer, lays down performance specifications for two types of instruments3 and specifies the functions to be provided on these types. This standard describes methods of test to be used for approval testing and guidance on methods for undertaking routine calibration.
The purpose of this standard is to ensure that measurements made under comparable test conditions with different instruments complying with the standard will be consistent. The standard is not intended to restrict development or incorporation of new features, nor to discourage innovative approaches.