Printer Output; N-20/N-20P Performance - Mallinckrodt Nellcor N-20 Service Manual

Specifications
For the N-20, a 2% or greater decrease in SpO 2 is indicated by two brief, low-pitched tones.
The N-20P printout shows SpO 2 and pulse rate at 30-second intervals. For the N-20P, a 2% or greater
decrease in SpO 2 is indicated by two brief, low-pitched tones and an asterisk (*) on the printout. At
the end of the measurement period, a header and statistical summary values (minimum, maximum, and
mean of both pulse rate and oxygen saturation) are printed.
8.4

Printer Output

When activated by the printer ON button, the N-20P output shows date, time, SpO 2 , and pulse rate (in
spot check mode), with space provided for writing in patient identification. The thermal paper
printout measures roughly 40 mm (1.6 in.) by 100 mm (4.0 in.) in size.
If the N-20P is in spot check mode and the printer is turned on any time during a measurement or after
a measurement is taken and before the N-20P powers down, the printer will catch up and print a
complete record of the measurements recorded up to the current moment.
8.5

N-20/N-20P Performance

8.5.1 Range
Saturation:
Pulse Rate:
8.5.2 SpO Accuracy
2
Adults:
Neonates:
Pulse Rate:
8.5.3 Response
In spot check mode, the measurement cycle (from button press to display of data) is five valid pulses.
In extended mode, the instrument measures for a period of up to 30 minutes and continuously displays
updated SpO 2 and pulse rate.
1
Accuracies are expressed as plus or minus "X" digits (saturation percentage points) between saturations of
70-100%. This variation equals plus or minus one standard deviation (1SD), which encompasses 68% of the population.
All accuracy specifications are based on testing the subject monitor on healthy adult volunteers in induced hypoxia studies
across the specified range. Adult accuracy is determined with Oxisensor II D-25 sensor. Neonatal accuracy is determined
with Oxisensor II N-25 sensor.
2
This variation equals one SD.
8-2
0–100%
20–250 beats per minute (bpm) ± 1 standard deviation
1
70–100% ± 2 digits
70–100% ± 3 digits
20 –250 bpm ± 3 digits
2
2
2