4.9.3 DISPLAY DIAGNOSTIC TESTT
(D2)
TEST DESCRIPTION
This
test provides a means of visually testing the operation of
all
LCD segments and LEDS.
When the test is selected, the
code
"D2
"
will
be displayed on the HL display for
2 seconds.
All
segments and
LEDs
will then be blanked for 2 seconds, after which
all
segments and
LEDs
will be turned on for 2 seconds to
allow
inspection
for
any displays which
do not
turn on.
All
segments/LEDs will then be turned on individually for 1 second in
a
left to right,
top to bottom sequence to allow for inspection
of
any
shorts between segments.
After all segments/LEDs
have
been
sequenced through all segments/LEDs will be turned back on
to indicate the completion of the test.
During
this test the low battery voltage monitoring will not be
performed
since the display is not available to indicate a
low
battery condition.
TEST INITIALIZATION
When
switched into the display diagnostic test,
the
instrument
will be initialized as follows:
Tone Type
= Current selection
Frequency = Current selection
Stimulus M
UX
= Current position
Channel = OFF
Attenuator position = 255
+10
dB
Pad = Out
Transducer Routing = None
HL Display = Displays
"D2"
for 2 seconds and then the
display test starts
Response LED = OFF
Stimulus On LED = OFF
Low Battery Segment = Current state
'I+r'
Segment = OFF
DESCRIPTION
OF
CONTROLS
All controls
except the Cal/Normal switch are
inactive
during
this
diagnostic test.
Operations of all other controls will be
ignored.
DESCRIPTION
OF
DISPLAYS
All LCD segments and
LEDs
are tested during this diagnostic test.
There
are
no parameter or status information displayed on
the
displays.
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