4.9.4 A/D CONVERTER DIAGNOSTIC TEST (D3)
TEST DESCRIPTION
This test will provide a means to test the A/D converter
channel
used to measure the battery voltage. When this test is selected
the A/D input will be sampled every
msec
and the converted
value
displayed on the HL display.
During
this test the low battery voltage monitoring will not be
performed since the A/D converter is not available to measure the
battery voltage.
TEST INITIALIZATION
When
switched
into
the A/D
Converter
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
"D1"
for 2 seconds and then blanks
Response LED = OFF
Stimulus On LED = OFF
Low Battery Segment = Current State
II
+
II
Segment = OFF
DESCRIPTION OF CONTROLS
All
controls
except the Cal/Normal switch
and
Extended
Range
Pushbutton are inactive during this diagnostic test.
Operations
of all other controls will be ignored.
EXTENDED RANGE PUSHBUTTON
This pushbutton is used to store the A/D values in the EEPROM for
"LO
Bat"
detection
and
instrument
"shutdown".
Instrument
"shutdown" will
occur when the battery voltage is
too
low to
safely operate the GSI 17 circuitry.
When the Extended Range Pushbutton is pressed the first time, the
A/D value is
stored as the battery low warning
limit in the
EEPROM.
The Patient Response LED will be turned ON and
"L1"
will
be displayed on
the
HL display
for
2 seconds.
Then
the
previously displayed
A/D value will be restored.
If the
A/D
value can not be stored properly, the word "CAL" will be
flashed
on the HL display and the previously displayed value will be
restored.
The A/D value for battery low warning limit must be
stored successfully before allowing the next press of Extended
Range Pushbutton to store the battery shutdown limit.
After the
A/D value is stored properly the EEPROM checksum will be updated.
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