ID: 993 / ver. 206
8
Preparing calibration
Place the left telephone on the artificial
ear and ensure it fits tight. This can be
done by selecting 125 Hz, and then
position the telephone to get the
biggest readout on the calibration
equipment.
6.1
Air conductor calibration
By means of the 11 calibration sliders,
calibrate the sound pressure for the 11
frequencies to the level set in the
Calibration Level
box. This is 80 dB by
default, but may be changed if desired
with the
Down
and
Up
buttons. If there
is masking available on the
audiometer, select it and calibrate the
masking to a level that is 3 dB higher
than the tone, for each frequency. Disable the band pass filter on the calibration equipment during masking
calibration. When finished the left channel place the right telephone on the artificial ear, select the right
channel, and repeat the tone and masking calibration. Before you start the calibration, be sure the
transducer in the dropdown menu e.g. air: TDH-39 is equal to the transducer in the headset of the
audiometer.
6.2
Bone conductor calibration
If there is a bone conductor available, it
should be calibrated too. Select bone and
calibrate the tone levels the same way as
the telephones, 60 dB VFL for frequencies
125 Hz to 4 kHz and 50 dB VFL for 6 kHz
to 8 kHz.
There is no masking calibration with the
bone conductor.
All calibration values and the date of
calibration are stored in the audiometer’s
memory immediately when the sliders are
moved, so nothing has to be done when
finished, just exit the calibration program.
To calibrate more than one audiometer,
just unplug the one that is calibrated and
connect the next one. The program will
detect this and update the screen.