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1)
Connect the right phone output unloaded
to
an RMS Meter.
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AUDIOMETER CALIBRATION
ATTENUATOR MAXIMUM OUTPUT CALIBRATION: During routine calibration it
should not be necessary to calibrate the Attenuator Maximum Output. However, if
the
Audiometer Default Data has been loaded then the Attenuator Maximum Output
must be calibrated.
2)
Use the
!=I
Hz
[c]
Keys to position the cursor on the 38 display at the
ATTEN
MAX CAL
position.
3)
4)
5)
Key
to enter the
ATTEN
MAX CAL Mode.
Press the Present Bar
0
to lock on the tone.
(The Tone Indicator
*
should now be present on the display.
Use the
p/
Hz
F)
to select the desired frequency for calibration.
Adjust
the dB HL knob until the output level for currently display frequency is within the
minimum/maximum values listed in the following table. When the desired output
level has been reached store the value by pressing the
pi
Key. Repeat
for
all frequencies.
Frequencv
(Hz)
Minimum
-
Maximum
125
.
2.05
-
2.30
vrms
250
2.05
-
2.30
vrms
500
2.33
-
2.5
vrms
750
1.69
-
1.9
vrms
1000
2.28
-
2.5 vrms
1500
2.28 -
2.5
vrms
2000
2.55 -
2.70
vrrns
3000
2.28 -
2.50 vrms
4000
2.55 -
2.70 vrms
6000
2.28
-
2.50
vrms
8000
2.28 -
2.50 vrms
After all frequencies have been calibrated press the
v]
Key to the Main
Calibration Mode Menu.
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