IS 4755 : 1987 Reference zero for the calibration of puretone air conduction audiometers

1 Scope

1.1 This standard specifies a standard reference zero for thescale of hearing threshold level applicable to pure tone airconduction audiometers in order to promote agreement and uniformityin the expression of hearing threshold level measurement throughoutthe world.

2 References

IS 2 :1960 Rules for roundingoff numerical values

IS 10779 : 1984Provisional reference coupler for the calibration ofearphones used in audiometry