Chapter 5 - Routine Maintenance
Bone Vibrator (B71) Calibration Values for Non-occluded Test Ear
Forehead Placement (ANSI 3.43 and ISO 7566)
Frequency 250 500 750 1000 1500 2000 3000 4000 6000 8000 Speech*
Radioear B71 with
79.0 72.0 61.5 51.0 47.5 42.5 42.0 43.5 51.0 50.0 63.5* dB re: 1 N
non-occluded ear
* Tentative
Speaker Reference Threshold Levels Re: 20 mPa
Frequency 125 250 500 750 1000 1500 2000 3000 4000 6000 8000 12000 Speech
45° Azimuth
23.5 12.0 3.0 0.5 0.0 -1.0 -2.5 -9.0 -8.5 -3.0 8.0 11.5 12.5
0° Azimuth
24.0 13.0 6.0 4.0 4.0 2.5 0.5 -4.0 -4.5 4.5 13.5 13.5 16.5
Frequency (Hz)
8000 9000 10000 11200 12500 14000 16000
45° Azimuth
8.0 10.5 11.0 10.0 11.5 16.0 43.5
0° Azimuth
13.5 15.5 15.5 14.0 13.0 18.0 44.5
Notes:
1. Forty-five degree Azimuth reference threshold values are based on ISO 8253-2.
2. Zero degree Azimuth reference threshold values are based on ISO 226-1.
Reference Levels for Pure Tones with Sennheiser HDA 200
SPL Values with the Sennheiser HDA 200 Earphones for 0 dB HL Setting
Frequency (Hz) 8 K 9 K 10 K 11.2 K 12.5 K 14 K 16 K 18 K 20 K
Sennheiser
HDA 200
16.0 17.0 21.5 21.0 27.5 37.5 58.0 8 3 105
Reference threshold values based on ISO/TC 43/WG 1 N 190 and Tom Frank, PhD; “High Freq. Hearing
Thresholds in Young Adults Using a Commercially Available Audiometer,” Ear and Hearing, Vol. 11 No.
6, 1990.
5-5
1761-0100 Rev. B
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