34
D-0126050 rev 1 -
270+ Operating Manual
To use the counter the operator selects the frequency buttons: left for
YES
or right for
NO
according to the response made by the patient.
The score will be automatically calculated and shown on screen.
Pressing
F3
(
CLEAR
) clears the counter to zero. To exit from the counter mode screen press
F1
again.
The results obtained will be saved in the temporary memory to be printed or sent to the computer. The obtained
SRT can also be saved using the
MENU
–
LOAD/SAVE
function. The results may be added to those already
established (use
F1
to activate the counter again).
4.9.7.
MASKING (SPEECH TESTING)
In some cases masking might be required to be applied to the opposite ear of the test ear. Select
MASK
and
choose the preferred option of manual or tracked masking. As soon as masking is active, the light ring around
the Channel 2 rotary control is illuminated and speech-weighted masking is now routed to the opposite
headphone to that selected.
4.9.8.
FREEFIELD PRESENTING (SPEECH TESTING)
Please note:
For the following Free Field modes of operation it is essential for the Free Field calibration
procedure described in Appendix A to have been performed. This aspect may also be subject to local
requirements or legislation.
Ensure the external amplifier/loudspeaker is correctly connected to the audiometer. Select
OUTPUT
button,
to select the transducer the test signal shall be presented to.
Select
F3
to utilise the connected loudspeakers to present the signal via
FREEFIELD
.
Ensure the intensity level of the signal presented via loudspeaker is correctly set via the VU meter display.
VU meter does not reach 0dB line
VU meter reaches 0dB line
Summary of Contents for 270+
Page 1: ...270 Operating Manual...
