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Performance Verification
3.3.5
Low Battery Test
3-14
To test for proper operation of the display backlight, observe the N-20PA in a
darkened room. If any backlight section is not working correctly, contact
Mallinckrodt's Technical Services Department or your local Mallinckrodt
representative for assistance.
The N-20PA CPU monitors the battery voltage level and alerts the user via the
Low Battery indicator when voltage is getting low. To test the proper function
of the Low Battery indicator, connect the N-20PA to an external variable DC
power supply.
Battery voltage levels described in this section are accurate; however, slight
variations may exist due to differences between batteries of different
manufacturers. To that point, the N-20PA operates normally at voltages above
4.0 VDC.
When the battery voltage drops below 4.05 VDC, the Low Battery indicator is
lit, and the two lowest segments of the battery level meter are lit (number of
segments lit is dependent upon battery strength) when the battery-check button is
pressed. When the voltage level drops below 4 VDC, the N-20PA continues to
display Oxygen Saturation and Pulse Rate values, but the printer no longer
operates; otherwise, the N-20PA operates normally.
Battery voltage levels below 3.5 VDC cause the Low Battery indicator to begin
flashing. When the battery-check button is pressed only the lowest segment of
the Low Battery indicator will illuminate.
When the battery voltage level drops below 3.3 VDC, the N-20PA turns itself
off.
Caution: If a sensor is attached, remove it prior to running the following
test.
To test for proper function of the Low Battery indicator:
1. Switch off the N-20PA; open the battery door and remove the batteries.
2. Set the power supply voltage to 5 VDC, and connect the supply to the
battery contacts of the N-20PA.
Note: Ensure that polarity is correct.
3. Switch on the N-20PA; verify complete Power-On Self Test (the N-20PA
should operate normally).
4. Decrease the power supply voltage to 4.0 VDC or slightly below. The Low
Battery indicator should illuminate and the lowest two segments of the
battery level meter should illuminate and printer operation should cease.
5. Decrease the power supply voltage to 3.5 VDC or slightly below. Then
press the battery-check button; the Low Battery indicator should begin to
flash and only the lowest segment of the battery level meter should
illuminate.
6. Decrease the power supply voltage to below 3.2 VDC. The N-20PA should
turn itself off immediately. Pressing the measure button should not turn the
unit back on.
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