ID: 1745 / ver. 201
3. OUTPUT adjustment (mode 3)
microphone. Adjust the telephone's position on the microphone to get the biggest deflection. This will
ensure that the telephone has a tight connection to the microphone.
Used to calibrate the levels of telephones, bone conductor, insert
phones and free field speaker. Choose the output to calibrate
with the output selectors. The right, left, bone and mono insert
outputs are selected on channel 2, and free field is selected on
channel 1.
The right and left outputs has two different sets of calibration.
One for normal phones, usually TDH-39, and one for inserts,
like the Eartone 3A or 5A. To select between these two sets,
press the TALK THROUGH button.
In addition to that,
Theory of operation
The output calibration is made so that all frequencies should be
calibrated to the same sound pressure level. The audiometer will
subtract a hearing level value during calibration, so when it
returns to normal operation, the output sound levels will be the
correct hearing levels. These hearing levels are stored in memory,
and can be displayed and altered in calibration mode 4. Normally
they should not be changed, but if the ISO standard is changed,
or another set of hearing levels is desired for some reason
(different countries may have different standards), they can be
changed. If they are changed, it must be done before the output
calibration in mode 3 is performed, otherwise the change will
have no effect.
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