Page 16 OM024-6 Model 240 Operating Manual
The automatic test will then proceed, starting with the familiarising routine
(if selected) and then testing at 1kHz followed by the higher frequencies
before testing for lower frequencies. The test may be cancelled at any
time by pressing the RESET key; any thresholds established will be
retained unless cleared or overwritten.
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 “2of3” 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 button continuously then the
test will pause with a message displayed. The operator will have the
option to repeat the test at the same frequency (press the YES key) or to
skip to the next frequency (press the NO key).
The TALKOVER key may be used to interrupt the test and give further
instructions to the patient (see Section 3.4.3).
An automatic test concludes with a re-test at 1kHz to ensure that
consistent responses have been made. If the threshold levels are not
consistent the operator is given the option to repeat or skip the re-test.
4.5.4 Post-test
When an automatic test has concluded, pressing the RESULTS key will
display the thresholds that were established. 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 RESET key
return to the default display by pressing the LEFT key
The thresholds are retained by the audiometer and may be viewed,
stored, printed or transferred to a computer (see Section 4.4.4).
Refer to Section 3.4.2 to clear the thresholds at the end of a test and, if
required, switch off the audiometer.
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