22
D-0126050 rev 1 -
270+ Operating Manual
4.6.8.
MASK (ACTIVATE MASKING)
Select the
MASK
button to activate or deactivate masking.
Select
NONE
(
F1
) to switch masking off.
As soon as the masking channel is switched on, the light ring around the Channel 2
rotary control illuminates white.
Use
MASK
(
F2
) to switch masking noise on and control the level manually. Select
TRACKED
(
F3
) to increase and decrease the masking level in relationship to the test
signal.
Select
CANCEL
(
F4
) or the
MASK
button again to leave the masking menu without changes.
4.6.9.
OUTPUT (AC, BC AND FREEFIELD)
Select the
OUTPUT
button, to select the transducer the test signal will be presented to.
Select
F1
to present the signal to the AC (air conduction)
PHONES
, using
F2
will present the tones to the
BONE
vibrator (BC, bone conduction). Selecting
F3
will utilise the connected loudspeakers to present the
signal via
FREEFIELD
. Select
CANCEL
(
F4
) or the
OUTPUT
button again to leave the menu without changes.
4.6.10.
AUTO (AUTOMATIC TESTING)
The
AUTO
function defines whether the tone audiometry test is conducted manually or automatically.
Select
AUTO
and Continue (
F3
)
Select
MANUAL
(
F1
) to perform manual audiometry (default setting).
Automatic testing can be conducted on both ears or on the current selected ear. To test only one frequency
(currently selected frequency) on the currently selected ear automatically, select
1 FREQ
(
F2
). To run a full
audiogram on the current selected ear, select
1 EAR
(
F3).
To run a full audiogram on both ears (the start ear
is the currently selected ear), select
BOTH
(
F4
). Select the
AUTO
button again to leave the menu without
changes.
4.6.11.
>100dB (EXTENDED RANGE)
When an extended range, above 100 dB is required, select the
>100dB
button to present tone levels up to
20dB higher.
Summary of Contents for 270+
Page 1: ...270 Operating Manual...
