Printer Output
When activated by the printer ON button, the N-20Ps 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.
N-20P Performance
RANGE
Saturation:
0-100%
Pulse Rate:
20-250 beats per minute (bpm) ± 1 standard deviation
2
SpO2 Accuracy 1
Adults:
70-95%
± 2 digits
2
50-69%
± 3 digits
2
0-49%
unspecified
Neonates:
70-95%
± 3 digits
2
Pulse Rate:
20-250 bpm
± 3 digits
2
Response
In spot check mode, the measurement cycle (from button press to display of data) is five valid pulses, depending
on patient pulse rate and perfusion.
In extended mode, the instrument measures for a period of up to 30 minutes and continuously displays updated
SpO
2
and pulse rate.
1. Accuracy is based upon testing an Oxisensor D-25 oxygen transducer. 68% of the measurements across the
population will be within ±1SD (standard deviation). Testing to verify these specifications is performed against
Nellcor N-20P pulse oximeters with D-25 sensors that have been previously validated for accuracy against an
Instrumentation Laboratories Co-Oximeter. The accuracy specification for neonates is based on measurements
taken with Oxisensor N-25 oxygen transducers. For specification of accuracies with other NELLCOR
sensors, see the sensor package insert.
2. This variation equals 1SD.
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