Mallinckrodt Nellcor N-20 Service Manual page 12

Performance Verification
N-20 (no printer)
N-20/P (with printer)
This test requires a new set of batteries. The new batteries must be installed after the test.
Connect the Nellcor SRC-2 pulse oximeter tester to the monitor.
Set the switches on the SRC-2 as follows:
Switch
RATE
LIGHT
MODULATION
RCAL/MODE
Momentarily press the MEASURE button, and 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 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 displaying the software version. 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.
The monitor must operate for at least 37 hours if the printer is not turned on.
Verify that the LOW BATTERY indicator lights steadily sometime after 30 hours of operation.
Verify that the monitor turns off approximately 1 hour after the LOW BATTERY indicator starts
flashing.
Allow the monitor to continue operation until power-down due to low battery.
3.3.3 Power-Up Performance
Monitors with the same software must demonstrate identical startup routines. The power-up tests
verify the self-test function.
When an N-20/N-20P is switched on, a sequence of diagnostic tests is run that examines the
instrument electronics and display functions. This power-on self-test consists of the following events:
Immediately after power is switched on, the instrument simultaneously:
•
Displays the number "8" in all six Oxygen Saturation and Pulse Rate display field segments;
•
Illuminates all 14 pulse rate amplitude indicator segments;
•
Illuminates the Pulse Search and Low Battery indicators; and
3-2
37 hours with Alkaline batteries.
32 hours with Alkaline batteries.
Setting
38
LOW
LOW
RCAL 63/LOCAL