Maico MA 28 Operation Manual page 26

5.8.4 Auto Threshold (Hughson-Westlake) – Air Only
In addition to traditional manual testing, the MA 28 incorporates a Hughson-Westlake
patient controlled automatic threshold test complying with ISO 8253 for air conduction
thresholds only.
Hughson-Westlake is a procedure used to determine pure tone thresholds. The MA 28
utilizes this procedure to perform an automatic pure tone test procedure (air conduction
only). Threshold is defined as 2 out of 3 (or 3 out of 5) correct responses obtained at a
certain level in a 10 dB decrease and 5 dB increase procedure. The test frequencies will
start at 1000 Hz and continue through those frequencies activated within the settings.
The device will re-test 1000 Hz before moving to the next ear or ending the test.
Prior to testing, the following instructions should be given. "You will now hear a variety
of tones with various loudness levels, please push the response switch when you
hear a tone and release the button when you no longer hear it". The patient response
can only be recorded during tone presentation.
The test is accessed through the function keys in the 3
screen Press F4 (More) until HW is displayed at F1. The HW Test results are captured in
an audiogram or table, identified by the Display type setting. See section 5.10.
The function keys for test operation are defined in Table 88
Table 8 Explanation of Function Keys for HW Test
Function Label
key
F1 Air
Right
F2
Left
Start
F3
Pause
F4 Back
NOTE: To delete the HW test, select New from the second function key menu in the
Tone test screen. This will delete all results stored within the Tone and HW test screens.
An optional familiarization portion can be incorporated into the test process. See section
5.10 for more information on this setting.
8506915 Rev. 5
Figure 17
Description
Non-active function key (air only).
To choose the test ear.
To start the HW test.
To pause HW test during automatic operation
To stop test progression and return to main test screen.
Operation Manual MA 28
rd
menu selection. From the main test
25 05/05/2021