Operation Manual MA 41
8100456 Rev.9
20
01/16
Manual Masking
The masking is switched on by pressing the Masking On/Off button (15). The
channel of the non-test ear is switched on and set to noise with a level of 0
dB
HL
.
Adjust the level of the masking noise by the right-hand level control dial. If the
Store button on either side of the instrument is pressed, the hearing threshold
value will be stored in the audiogram with the corresponding masking symbol.
The masking sound should be continuously presented for effective masking by
pressing the STIM button. You can interrupt the masking signal by pressing the
corresponding stimulus button (2).
Automatic Masking
With the manual masking, as described before, the masking level should be
adjusted every time you change the test signal level. The MA 41 has a tracking
function for easy masking.
Set the tone level and the masking level to a desired difference for effective
masking. Press the TRACK button (14) to implement the automatic masking
feature. The masking level is automatically changed if you adjust the test signal
level (e.g. if the test level is at 30 dB
HL
and the masking level 50 dB
HL
and you
change the test level to 45 dB
HL
the masking level will automatically adjust to
65 dB
HL
).
Figure 6 - Tone Audiometry with Masking
Summary of Contents for MA 41
Page 1: ...Operation Manual MA 41...
Page 2: ......
