AmpliVox 260 - Page 30

Page 28 OM023-4 Amplivox 260 Operating Manual
A1.1 Live Voice Speech Audiometry to Headphones
A1.1.1 Set Up:
a) Connect a microphone to the MIC1 input on the audiometer
b) 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)
c) The microphone 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) Input signal adjustment should be made to adjust for the operator’s
voice to peak at the 0dB point on the LEVEL dB bar graph; the
earphone output will then be 89dBSPL for a SIGNAL setting of 70
dBHL and 1kHz puretone into an IEC 318 ear simulator
f) The output level is controlled by the SIGNAL  keys in 2.5dB or
5dB steps (depending on settings - see Section 3.4.2)
g) Sound from MIC1 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
A1.1.2 Procedure:
The operator may now read the required word list to the subject and
record the responses; the patient may respond either by (a) repeating the
spoken material or (b) writing the words. If the response is spoken, the
operator should use the TALKBACK key to hear this response (see
operator monitoring above).
A1.2 Live Voice Speech Audiometry with Contralateral Masking
A1.2.1 Set Up - as described in A1.1.1 then:
a) Select MASK
b) INT is now displayed indicating that internal masking is selected
(Note: External masking is not available when MIC is selected)
c) Speech-weighted masking is now routed to the opposite earphone to
that selected