1.4 OUTPUT HEARING LEVEL CONTROL
CALIBRATED
IN
dB
HL
MEASURED
IN
INCREMENTS
OF
5
dB
RANGES
125
Hz
-10
to
50
dBB
HL
500to
6000
Hz -10
to
90
dBB
HL
250
and
8000
Hz
-10
to
70
dBB
HL
Additionally A
"+10
dB""
Extended Range
Switch,
which
extends
maximum HL at all frequencies by 10
dB.
ACCURACY
OF
ALL SETTINGS
OF
HEARING LEVEL CONTROL:
125 to 4000 Hz
+3
dB
6000 to 8000 Hz
+5
dB
1.5 SIGNAL TO NOISE RATIO (IN
1/3
OCTAVE)
>70
dB
measured acoustically in
dB
HL
1.6 TONE SWITCH
This
electronic
switch turns the stimulus
signal
ON/OFF with
minimal audible distortion.
MODES
Normal State:
Activated State:
Stimulus OFF
Stimulus ON
RISE/FALL TIME
20-50
ms
Measured at the -1
dB
and
-20
dB
points on the signal envelope.
ON/OFF RAT IO
With
the
Tone Switch OFF,
the output will be at
least
-10
dB
below standard reference equivalent threshold for any
1/3
octave
band with HL setting of 60
dB
or below.
ABOVE
60
dB
HL
SETTING
>70
dB
CROSS CHANNEL LEAKAGE
At HL settings of 70
dB
or greater,unwanted signals in the
non-
test earphone shall be at least 70
dB
below the tone in the test
earphone.
dB2
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