Page 30 OM023-4 Amplivox 260 Operating Manual
A1.4 Recorded Speech Audiometry to Headphones with
Contralateral Masking
A1.4.1 Set Up - as described in A1.3.1 then:
a) Select MASK
b) Switch between INT (internal) and EXT (external) masking source by
pressing the MASK key until the required option is displayed in
capitals; INT will be speech-weighted noise and EXT will be the
competing noise from the signal source
c) The masking noise is now routed to the opposite earphone to that
selected
d) The MASKING keys changes the masking level in 2.5dB or 5dB
steps (depending on settings - see Section 3.4.2)
e) If required, readjustment of the input signal level can be accessed by
pressing the MASK key to temporarily deselect the masking function;
proceed as in A1.1.1d) and when adjustment has been completed
press the MASK key to activate the appropriate masking noise
A1.4.2 Procedure:
As described in A1.3.2 but adjusting the masking level as required using
the MASKING keys.
IMPORTANT NOTES – FREE FIELD MODES
For the following Free Field modes of operation it is essential for the Free
Field calibration procedure described in Appendix 2 of this operating
manual to have been performed. This aspect may also be subject to local
requirements or legislation.
A1.5 Free Field Live Voice Speech Audiometry
A1.5.1 Set Up:
a) Connect an external amplifier/speaker to the LINE OUT jack socket;
refer to Section 2.7 of this operating manual
b) Connect a microphone to the MIC1 input on the audiometer
c) Press SPEECH repeatedly to ensure that ‘MIC’ is displayed in capitals
at the bottom left of the display (indicating that the external
microphone is selected)
d) Press the FREEFIELD key
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