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AUDIOMETER
SPL OUTPUT LEVEL CALIBRATION
1)
Use
the
a
IHz[m
IKeys
to position
the cursor on the
38
display at XDUCER
STIM CAL.
2)
Press
the
I=]
Key to
enter the XDUCER
STIM
CAL
MODE.
The display should now indicate:
XDUCER
STIM
CAL
40.0
dB
125
Hz
R
NOTE: Tone Bar is OFF
or Inactive
40.0
dB
Indicates the Current Hearing Level (HL) selected.
125 Hz
Indicates the Current Frequency (Hz) selected.
R
Indicates the Current Transducer selected.
Indicates a Steady Tone Presentation
The Tone Bar is active in this mode and serves a dual function. When the Tone Bar
is OFF or inactive the current hearing level is displayed
as
shown above.
When the Tone Bar is pressed ON or active the stim on indicator
*
will appear on
the display and the 40.0
dB
(HL) indicator will update
to
the ANSI Standard Reference
Threshold Level (RTL) measured in Sound Pressure Level (SPL) for the selected
frequency and hearing level.
Example:
40.0
dB
(HL) at 125 Hz (Freq) will update to 85.0
dB
SPL
when the Tone Bar is depressed.
.
Given:
The ANSI Standard (RTL) correction value for 125 Hz at 0 HL is
equal to 45.0
dB
SPL.
Therefore:
At 40
dB
HL which
is
40
dB
SPL higher that 0
dB
HL the output for
125
Hz
will equal 85.0
dB
SPL.
For 125 Hz
ANSI Standard RTL for 0
dB
HL
=
45.0
dB
SPL
(+)40
dB
HL
=
(+)40.0
dB
SPL
40
dB
HL
=
85.0
dB
SPL
40
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