Output Hearing Level Control
Calibrated in
dB
HL.
Measured in increments of 5
dB
Ranges:
125Hz -10to
50
dBBHL
500
to 6000 Hz
-10to
90
dBB
HL
250
and 8000 Hz
-10to70dBB
HL
dB"
Extended Range switch, which extends the Maximum HL at all
Additionally a
"+1
0
frequencies by IO
dB.
Accuracy
of all
settings
of Hearing Level control:
125
to 4000 Hz
+/-
3
dB
6000 to 8000 Hz
+/- 5
dB
Signal
to Noise ratio (in
1/3
Octave):
>70
dB
or less than -10
dB
HL
(for levels less than 60
dB
HL)
Tone Switch:
This electronic switch turns the stimulus signal on/off with minimal
audible distortion.
Modes:
Normal state:
Stimulus Off
Activated state:
Stimulus On
Rise/Fall Time:
20-50
msec
Measured at the
-1
dB
and -20
dB
points on the signal envelope.
On/Off Ratio:
With the tone switch off, the output will be at least -10
dB
below
standard reference equivalent threshold with HL setting of 60
dB.
Above 60
dB
HL
setting:
>70
dB
Cross Channel Leakage: At HL settings of 70
dB
or greater, the unwanted signal in
the non test earphone shall be at least 70
dB
below the tone
in the test earphone.
Stimulus Signals
Continuous signals
Continuous FM
Pulsed
7
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