AmpliVox 260 - A1.6 Free Field Recorded Speech Audiometry; A1.7 Free Field Recorded Speech Audiometry With Competing Noise (Audiometer-Generated); Appendix 2 - Free Field Calibration Procedure; A2.1 Assurance of Calibration

OM023-4 Amplivox 260 Operating Manual Page 31
e) The external microphone is now routed to the external amplifier and
speaker; use LEFT and RIGHT to select the required amplifier
channel
f) Continue from Section A1.1.1d) to Section A1.1.1g) above
A1.5.2 Procedure:
As described in A1.1.2.
A1.6 Free Field Recorded Speech Audiometry
A1.6.1 Set Up:
a) Connect an external amplifier/speaker to the LINE OUT jack socket,
and 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) Press the FREE FIELD key
d) The line input is now routed to the external amplifier and speaker; use
LEFT and RIGHT to select the required amplifier channel
e) Play the 1kHz calibration tone on the recorded material and follow the
calibration procedure in Appendix 2
f) The input signal level is adjusted in 1dB steps by use of the MASKING
 keys
g) Adjust the input signal such that the LEVEL dB bar graph reads 0dB
A1.6.2 Procedure:
As described in A1.3.2
A1.7 Free Field Recorded Speech Audiometry With Competing
Noise (Audiometer-Generated)
A1.7.1 Set Up: - as described in A1.6.1 then:
a) Press the MASK key
b) Ensure that INT is displayed in capitals indicating that the audiometer-
generated noise is selected; if necessary press the MASK key until
INT is displayed in capitals
c) Speech-weighted noise is routed to the competing LINE OUT channel