BS 2497-5:1988
$86.31
Standard reference zero for the calibration of pure tone air conduction audiometers – Specification for a standard reference zero using an acoustic coupler complying with BS 4668
| Published By | Publication Date | Number of Pages |
| BSI | 1988 | 8 |
Reference equivalent threshold sound pressure levels for two earphones, Beyer DT 48 with flat cushion and Telephonics TDH 39 with MC 41/AR cushion, in a form suitable for calibration.
