Table of Contents
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SECTION 1: INTRODUCTION
1.1
MANUAL OVERVIEW
1.2
WARNINGS, CAUTIONS, AND NOTES
1.2.1
Warning
1.2.2
Caution
1.2.3
Note
1.3
DESCRIPTION OF THE N-20PA PORTABLE PULSE OXIMETER
1.1 Manual Overview
1.2 Warnings, Cautions, and Notes
1.3 Description of the N-20PA Portable Pulse Oximeter
This manual contains information for servicing the N-20PA portable pulse
oximeter. Only qualified service personnel should service this product. Before
servicing the device, read the operator's manual carefully for a thorough
understanding of its operation.
This manual uses three terms that are important for proper operation of the
device: Warning, Caution, and Note.
A warning precedes an action that may result in injury or death to the patient or
user. Warnings are boxed and highlighted in boldface type.
A caution precedes an action that may result in damage to, or malfunction of, the
device. Cautions are highlighted in boldface type.
A note gives information that requires special attention.
The Nellcor
N-20PA portable pulse oximeter provides noninvasive
measurement of, and continuous information about, the percent of oxygenated
hemoglobin compared with total hemoglobin and pulse rate. A pulse amplitude
indicator provides a qualitative indication of pulse activity and patient perfusion.
Patients are connected to the instrument by a Nellcor sensor. The sensor LEDs
are driven by the SpO
2
signals, and provides CPU-adjustable gain stages. The N-20PA CPU measures
the sensor's analog outputs, continually controls the signal gain, and calculates
SpO
and pulse rate.
2
The N-20PA is automatically calibrated each time it is switched on, and
whenever a new sensor is connected; it sets sensor-specific calibration
coefficients by reading a calibration resistor in the sensor. Also, the intensity of
the sensor's light sources are adjusted automatically to compensate for
differences in tissue thickness and darkness.
analog section, which also conditions the incoming
1-1
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