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D-0115687-C (OM008) – 170 Operating Manual
Automatic testing proceeds by increasing the tone level in 5dB steps until
a response is made, then decreasing the level by 10dB and presenting
another tone. If there is no response the level is increased in 5dB steps,
and when a response is made the level is attenuated again by 10dB.
When 3 responses are made to 5 tone presentations at the same level
(“3of5”) this is taken to be the threshold. The “2 of 3 in auto” option
records a threshold if 2 responses are made to 3 tone presentations.
If an error occurs, for example the patient does not respond to the loudest
tone presented or holds down the response switch continuously then the
test will pause with a message displayed. Refer to Section 4.5.5.
The TALKOVER key may be used to interrupt the test and give further
instructions to the patient (see Section 3.5.3).
An automatic test concludes with a re-test at 1kHz to ensure that
consistent responses have been made. If the threshold levels for the two
tests are within 10dB the threshold established for the re-test will be
retained. Otherwise the test will pause with a message displayed. Refer to
Section 4.5.5.
4.5.4 Post-test
When an automatic test has concluded the “Test finished” message is
displayed. Pressing the RESULTS key will display the thresholds that
were established (use the LEFT & RIGHT keys to select the required ear).
Use the FREQUENCY keys to view all the frequencies. One or more
of the following actions may then be taken:
record the thresholds manually on an audiogram card
print the results by pressing the PRINT key
return to the default display by pressing the MENU key
If required the operator may then add or modify automatically-generated
thresholds using manual audiometry (see Section 4.4)
The thresholds are retained by the audiometer and may be viewed,
stored, printed or transferred to a computer as described in Section 4.4.4.
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