ROUTING SWITCH
This switch selects
the transducer to which
the
stimulus is
routed just as in the Normal Mode.
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FREQUENCY KNOB
The
frequency
knob is used to select
the
internal
oscillator
frequency
and to control the stimulus multiplexer.
When 125 Hz
to 8000 Hz are selected on the knob, the internal oscillator is
set for the frequency selected and the stimulus mux is set to the
internal oscillator.
When the unlabeled position on
the
knob
between
125 Hz and 8000 Hz is selected the stimulus mux will be
set to
select
the
external
stimulus
input.
The
internal
oscillator
will
remain at the
last
selected
frequency. An
external signal of 1 V RMS can be applied to
J2
on the board.
PRESENT
BAR
The
Present
Bar controls the presentation of the
stimulus.
It
operates in
a
push on/push off manner so, if it is
operated
(pressed and
released) when the stimulus is off the stimulus will
be presented
and will remain on until the Present Bar is operated
a
second time.
The
+10
dB
pad will not be affected by
turning
the stimulus ON or OFF.
HL
SELECTOR
This
knob is used to directly set the attenuator position.
The
position will be adjusted by
+0.5
dB
(1 step) for each clockwise
step
of the knob and by
-0.5
dB
for each counter clockwise
step
of the knob.
The allowable range of the attenuator position will
be
from 0 to 255.
When either of these limits are
reached
the
attenuator
position will not change and the HL display will be
flashed.
EXTENDED RANGE PUSHBUTTON
This pushbutton
is used to control the position of the
+10
dB
pad.
When
this pushbutton is operated the
+10
dB
pad
will be
selected
and the "+"
LCD segment will turn on to
indicate
that
the pad is in.
When the pushbutton is operated a
second
time,
the pad
will be removed and the "+" segment
turned
off.
The
attenuator will not be compensated for the pad position.
RESPONSE SWITCH
This
switch is not used during the hardware diagnostic test
and
all operations will be ignored.
HL
DISPLAY
This display is used to display the the attenuator
position in
the range of 0 to 255 as selected by the HL selector.
It will be
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