ID: 1745 / ver. 201
Adjustment of the bone conductor
Adjustment of the bone conductor is done at 60 dB, as default. As for the telephones, this default level
can be changed by holding SHIFT while pressing the attenuator keys. The adjustment should be done
through a bandpass filter. At 8000 Hz, no adjustment is made, as this frequency is unused with the
bone conductor.
Adjustment
Place the bone conductor on the vibration sensor. Choose 'BONE' with the channel 2 output selector.
Adjust to 60 dB at each frequency. As for the telephones, the audiometer will subtract the hearing
levels stored in mode 4 to give the same sound pressure at all frequencies while calibrating.
Hearing level table for bone conductor (RETFL)
125
250
500
750
1000
1500
2000
3000
4000
6000
82.5
67.5
58.0
48.5
42.5
36.5
31.0
30.0
35.5
40.0
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