ID: 993 / ver. 206
15
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.
7.5
Air conductor calibration (only TSM500)
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.
7.6
Bone conductor calibration (only TSM500)
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. If
more than one audiometer is calibrated,
just unplug the one that is calibrated and
connect the next one. The program will
detect this and update the screen.