Mallinckrodt Nellcor N-20 Service Manual page 15

4. 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."
5. The OXYGEN SATURATION display momentarily indicates the monitor 3 digit software
version. The other displays are not lit.
6. Software versions may vary depending on the type of monitor and the date of manufacture.
The N-20P will display printer status immediately after software version display. The OXYGEN
SATURATION display will indicate "Pr," and the PULSE RATE display will indicate either "On" or
"OFF."
The OXYGEN SATURATION display momentarily indicates the letters "tSt" and the monitor sounds
a single tone. The other displays are not lit. "tSt" verifies that the monitor recognizes that a tester is
connected.
The OXYGEN SATURATION and PULSE RATE displays indicate "0," the PULSE SEARCH
indicator is flashing, and the PULSE BAR will start to register the simulated pulse.
After a few beats a pulse tone will be heard, and the PULSE SEARCH indicator will turn off. The
OXYGEN SATURATION display indicates between 79 and 83 and the PULSE RATE display
indicates between 37 and 39.
3.3.6.2 Normal Operation
These tests are an overall qualitative check of the system and require connecting a live subject to the
monitor:
Connect a DS-100A Sensor to monitor.
Place the DS-100A Sensor on the subject as recommended in the monitor Operator's Manual.
Press the Measure button for at least 5 seconds to turn on the monitor.
The monitor should stabilize on the subject's physiological signal in about 10 to 15 seconds. Verify
that the saturation value and pulse rate are acceptable.
Performance Verification
3-5