Welch Allyn AM282 Audiometer - User Manual - Manual (Page 31)

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Appendix A
DD45 External Headset RETSPL Values for NBS 9A Coupler
ANSI S3.6 and ISO 389.2 Reference Thresholds for ER3A/ER5A Internal Earphones with
Rigid Tube
Frequency
(Hz) 125 250 500 750 1000 1500 2000 3000 4000 6000 8000
R/L
(dB) 47.5 27.0 13.0 6.50 6.0 8.0 8.0 8.0 9.0 20.5 12.0
Frequency
(Hz) 125 250 500 750 1000 1500 2000 3000 4000 6000 8000
R/L
(dB) 26 14.0 5.5 2.0 0 2.0 3.0 3.5 5.5 2.0 0