d) The MASKING keys change 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 masking noise
A1.2.2 Procedure:
As described in A1.1.2 but adjusting the masking level as required using
the MASKING keys.
A1.3 Recorded Speech Audiometry to Headphones
A1.3.1 Set Up:
a) Connect a CD, tape player, or other sound source to the LINE IN jack
socket; refer to Section 2.7 of this operating manual
b) Press SPEECH repeatedly to ensure that ‘LINE’ is displayed in
capitals at the bottom left of the display (indicating that the input from
LINE IN is selected)
c) The line input is initially routed to the left earphone. To select the right
earphone press RIGHT
d) The input signal level is adjusted in 1dB steps by use of the MASKING
keys
e) Play the 1kHz calibration tone on the recorded material and adjust the
input signal such that the LEVEL dB bar graph reads 0dB; the
headphone output measured in an IEC 318 ear simulator will now be
89dBSPL for a setting of 70 dBHL
h) The output level is controlled by the SIGNAL keys in 2.5dB or
5dB steps (depending on settings - see Section 3.4.2)
i) Sound from LINE IN is continually routed to the patient - to interrupt
this, press and hold the PRESENT key; if a constant presentation to
the patient is not desired, press the CONSTANT key (the LED will
extinguish) and use the PRESENT key while presenting the test
material
A1.3.2 Procedure:
As described in A1.1.2 except that the operator plays the recorded
material to the subject.
To Next Page
Loading...
