BS 2497-4:1972
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Specification for a reference zero for the calibration of pure-tone audiometers Normal threshold of hearing for pure tones by bone conduction
Hardcopy
23-07-2013
English
25-07-1972
Specifies value of acceleration corresponding to the audiometric zero for bone conduction listening to pure tones.
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.