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•
Illuminates the display backlight.
During the next few seconds, the instrument:
•
Switches off the display backlight;
•
Displays three digits in the Oxygen Saturation display field representing the software version (for
example, 123 is software version 1.2.3).
•
Only the N-20P displays the printer status in the display fields; that is, either "Pr On" or "Pr OFF."
If a sensor is attached to the instrument, a zero ("0") appears in first position of the display fields. The
Pulse Search indicator flashes; if no sensor is attached to the instrument, horizontal dashes appear in
all six Oxygen Saturation and Pulse Rate display fields, and the Pulse Search indicator flashes.
After approximately 1 minute, a short beep occurs and the instrument automatically switches off.
If at any time during the test sequence "Err" followed by a code number is displayed, make a note of
the error code and refer to Section 4.7, Error Codes, for a description.
3.3.3.1 How To Run the Self-Test
Place a new set of batteries in the monitor.
Do not connect a sensor or SRC-2 to the monitor.
Momentarily press the MEASURE button, verify the following power-up sequence:
All indicators—OXYGEN SATURATION, PULSE RATE, PULSE SEARCH, LOW BATTERY,
and the PULSE BARS—light for a few seconds. Verify that the OXYGEN SATURATION and
PULSE RATE displays indicate "888."
The OXYGEN SATURATION display momentarily indicates the monitor 3-digit software version.
The other displays are not lit.
Software versions may vary depending on the type of monitor and the date of manufacture.
The N-20P will display printer status immediately after it displays software version. The OXYGEN
SATURATION display will indicate "Pr" and the PULSE RATE display will indicate either "On"or
"OFF."
OXYGEN SATURATION and PULSE RATE display dashes (– – –) in each window, the monitor
sounds a single tone, and the PULSE SEARCH indicator is flashing. The other displays are not lit.
Verify that the monitor automatically turns off after 60 seconds.
If the Measure button was held down for more than 3 seconds (extended mode), the monitor will not
turn off after 60 seconds but will operate for approximately 3 minutes before automatically turning
off.
3.3.4
Printer Test
The following procedure applies to the N-20P only.
The SRC-2 must be used to test the operation of the N-20P printer and the printer's user-control
buttons. When an SRC-2 is plugged into the DB-9 connector, the N-20P does not respond to button
presses during Power-On Self-Test; however, it does acknowledge any button press after the self-test
with an immediate beep and the following display codes:
Button Press
Measure
battery check
Display
9O
bAt
Performance Verification
3-3
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