Nellcor OXIMAX N-600X Series User manual

OXIMAX
N-600X
Pulse Oximeter
with
Alarm Management System
Service Manual
TM
To Purchase, Visit Avobus.com or call 1-800-674-3655

Nellcor, Durasensor, Dura-Y, Max-Fast, OxiCliq, Oxiband, OxiMax, Oxinet, Pedi-Check, SatSeconds, OxiMax SPD Alert,
and SoftCare are trademarks of Nellcor Puritan Bennett LLC.
The OxiMax N-600x™ pulse oximeter is covered by one or more of the following U.S. patents and foreign equivalents:
Patent No. 5,485,847; 5,676,141; 5,743,263; 6,035,223; 6,226,539; 6,411,833; 6,463,310; 6,591,123; 6,708,049;
7,016,715; 7,039,538; 7,120,479; 7,120,480; 7,142,142; 7,162,288; 7,190,985; 7,194,293; 7,209,774; 7,212,847.
To obtain information about a warranty, if any, contact Nellcor’s Technical Services Department at 1.800.635.5267 or
your local Nellcor representative.
Purchase of this instrument confers no express or implied license under any Nellcor Puritan Bennett patent to use the
instrument with any sensor that is not manufactured or licensed by Nellcor Puritan Bennett LLC.

Service Manual 10030881 Rev. B 12-2008 iii
Table of Contents
Chapter 1. Safety Information............................................................... 9
Overview.........................................................................................................9
Warnings.........................................................................................................9
Cautions ........................................................................................................11
Chapter 2. General Introduction ......................................................... 13
Overview.......................................................................................................13
Related Documents .................................................................................13
Oximeter Description and Intended Use.......................................................13
Description..............................................................................................13
Intended Use ...........................................................................................14
List of Components.......................................................................................15
Front Panel....................................................................................................16
User Interface..........................................................................................16
Oximeter Visual Indicators.....................................................................17
Monitoring Values ..................................................................................19
Audible Indicators...................................................................................20
Rear Panel .....................................................................................................21
Rear Panel Symbols and Descriptions ....................................................21
Oximeter Features.........................................................................................22
OxiMax SPD™ Alert Feature.................................................................22
SatSeconds™ Alarm Management Feature ............................................22
Pulse Rate Delay Alarm Management Feature.......................................26
Oximeter Display View Options...................................................................26
Selecting Display Views.........................................................................26
General Care Format (GCF) Display......................................................26
Plethysmographic (Pleth) Display ..........................................................27
Blip Display ...........................................................................................27
Real-Time Trend Display .......................................................................27
Chapter 3. Product Specifications ...................................................... 29
Overview.......................................................................................................29
Physical Characteristics ................................................................................29
Electrical Requirements................................................................................29
Power ......................................................................................................29
Battery.....................................................................................................29
Rating of Nurse Call Relay.....................................................................30
Environmental Conditions ............................................................................30
Operating ................................................................................................30
Transport and Storage.............................................................................30
Performance Specifications ..........................................................................30
Measurement Range ...............................................................................30
OxiMax™ Pulse Oximetry Sensors........................................................31
Product Compliance......................................................................................32

iv 10030881 Rev. B 12-2008 Service Manual
Product Standards for Compliance .........................................................32
Product Safety Standards ........................................................................32
Electromagnetic Compatibility (EMC) Standards..................................32
Manufacturer’s Declaration ..........................................................................32
Basics ......................................................................................................32
Electromagnetic Compatibility (EMC)...................................................33
Electromagnetic Immunity .....................................................................33
Sensor and Cable Compliance ................................................................35
Safety Tests...................................................................................................36
Ground Integrity .....................................................................................36
Leakage Current......................................................................................37
Chapter 4. Theory of Operations ........................................................ 39
Overview.......................................................................................................39
Understanding Pulse Oximetry.....................................................................39
Theoretical Principles .............................................................................39
Automatic Calibration.............................................................................40
Functional versus Fractional Saturation .................................................40
Measured versus Calculated Saturation..................................................40
Oximeter Features.........................................................................................41
SatSeconds™ Alarm Management Feature ............................................41
Pulse Rate Delay Alarm Management Feature.......................................41
OxiMax SPD™ Alert Feature.................................................................42
OxiMax™ Pulse Oximetry Sensor Technology .....................................42
Functional Testers and Patient Simulators....................................................43
Chapter 5. Product Overview.............................................................. 45
Overview.......................................................................................................45
Oximeter Block Diagram..............................................................................45
System Board Components...........................................................................46
System Board Component Overview .....................................................46
Secondary Input Port/Secondary Output Port (SIP/SOP).......................46
NELL-1A Oximetry Module ..................................................................46
User Interface (UIF)................................................................................47
Power ............................................................................................................47
Pulse Oximetry Sensors and Cables .............................................................48
Chapter 6. Setting Up the Oximeter.................................................... 49
Safety Reminders..........................................................................................49
Connecting to an AC Power Source .............................................................50
Using Battery Power.....................................................................................51
Overview.................................................................................................51
Connecting an OxiMax™ Pulse Oximetry Sensor .......................................53
Reducing EMI (Electromagnetic Interference).............................................54
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Service Manual 10030881 Rev. B 12-2008 v
Chapter 7. Operating the Oximeter..................................................... 55
Overview.......................................................................................................55
Monitoring Oximeter Power.........................................................................55
Battery Fuel Gauge .................................................................................55
Low Battery Indicator.............................................................................56
Powering the Oximeter .................................................................................57
Power Prerequisites.................................................................................57
Power-On Self-Test (POST)...................................................................57
Automatic Shutdown and Power Off......................................................59
Using OxiMax™ Pulse Oximetry Sensors ...................................................59
Sensor Detection .....................................................................................60
Sensor Detection Failure.........................................................................61
Managing the Oximeter Backlight................................................................61
Managing the View Display .........................................................................62
Adjusting the Volume of Audible Tones......................................................62
Adjusting the Pulse Beep Volume ..........................................................62
Managing Oximeter Alarms ...................................................................62
Managing Audible Alarms......................................................................63
Using Oximeter Softkey Menus ...................................................................64
Navigating Menu Options.......................................................................64
Adjusting the Factory Default Settings...................................................72
Using the OxiMax SPD™ Alert Feature ................................................77
Using the Pulse Rate Delay Alarm Management Feature ......................78
Using the SatSeconds™ Alarm Management Feature............................78
Chapter 8. Managing the Data Port .................................................... 79
Managing Oximeter Trend Data ...................................................................79
Data Port Connectivity..................................................................................79
Overview.................................................................................................79
Data Port Requirements ..........................................................................79
Data Port Communications.....................................................................81
Accessing Data Using the Comm Port and a Computer.........................83
Configuring the Data Port Interface..............................................................84
Communication Protocol ........................................................................84
Managing the Data Port ................................................................................86
Data Printout Information.......................................................................86
Using the Nurse Call Interface......................................................................93
Nurse Call Feature ..................................................................................93
Setting Nurse Call RS-232 Polarity ........................................................94
Calculating the Analog Voltage Output........................................................94
Chapter 9. Performance Considerations ............................................ 97
Overview.......................................................................................................97
Performance Considerations .........................................................................97
Primary Considerations...........................................................................97
Oximetry Considerations ........................................................................98

vi 10030881 Rev. B 12-2008 Service Manual
Patient Conditions...................................................................................98
OxiMax™ Pulse Oximetry Sensor Performance Considerations.................98
Safety Information ..................................................................................98
Inaccurate Sensor Measurement Conditions...........................................99
Signal Loss..............................................................................................99
Recommended Usage .............................................................................99
Chapter 10. Oximeter Preventive Maintenance.................................. 101
Overview.....................................................................................................101
Cleaning ......................................................................................................101
Periodic Safety Checks ...............................................................................101
Chapter 11. Modifying and Testing the Oximeter ............................... 103
Overview.....................................................................................................103
Setting Institutional Defaults (Sample).......................................................103
Performance Verification............................................................................105
Overview...............................................................................................105
Required Equipment .............................................................................105
Safety Testing Standards ............................................................................106
Battery Check .............................................................................................106
Battery Power .......................................................................................106
Battery Charge ......................................................................................106
Performance Tests.......................................................................................107
Power-On Defaults and Alarm Ranges.................................................107
Operational Setup .................................................................................110
Overall Performance Check..................................................................115
Pulse Oximetry Functional Tests..........................................................117
Setting Nurse Call.................................................................................130
Service Function Menus .......................................................................130
Chapter 12. Troubleshooting .............................................................. 137
Overview.....................................................................................................137
Help and Support ........................................................................................137
Technical Services ................................................................................137
On-Screen Help.....................................................................................137
Problem Resolution.....................................................................................140
Prompts, Error Messages, and Error Codes................................................141
Prompts and Error Messages ................................................................141
Error Codes ...........................................................................................144
Error Codes for Non-correctable Failures ............................................146
Power ..........................................................................................................152
Keys ............................................................................................................153
Display/Alarms ...........................................................................................153
Operational Performance ............................................................................154
Data Port .....................................................................................................154
Primary Speaker Failure .............................................................................155
Low and Critical Battery Conditions ..........................................................156

Service Manual 10030881 Rev. B 12-2008 vii
Obtaining Technical Assistance..................................................................159
Returning your Oximeter ............................................................................159
Chapter 13. Ordering Oximeter Spare Parts ..................................... 161
Overview.....................................................................................................161
Ordering Replacement Parts .......................................................................161
Spare Parts List ...........................................................................................162
Chapter 14. Repairing the Oximeter .................................................. 165
Overview.....................................................................................................165
Fuse Replacement .......................................................................................166
Oximeter Disassembly and Reassembly.....................................................167
Disassembling the Oximeter.................................................................167
Reassembling the Oximeter ..................................................................169
Battery Replacement...................................................................................170
Removing the Old Battery ....................................................................170
Replacing the Battery............................................................................171
Power Entry Module (PEM) Replacement .................................................172
Removing the Power Entry Module .....................................................172
Replacing the Power Entry Module......................................................173
Power Supply Replacement ........................................................................174
Removing the Power Supply ................................................................174
Replacing the Power Supply.................................................................175
Cooling Fan Replacement...........................................................................176
Removing the Cooling Fan ...................................................................176
Replacing the Cooling Fan ...................................................................176
Display PCB Replacement..........................................................................177
Removing the Display PCB..................................................................177
Replacing the Display PCB ..................................................................178
Main Board PCB Replacement...................................................................179
Removing the Main Board PCB ...........................................................179
Replacing the Main Board PCB............................................................180
Alarm Speaker Replacement ......................................................................181
Removing the Alarm Speaker...............................................................181
Replacing the Alarm Speaker ...............................................................182
Top Case Assembly Replacement ..............................................................183
Removing the Top Case Assembly.......................................................183
Replacing the Top Case Assembly .......................................................183
Packing the Oximeter for Shipment............................................................184
Shipment Requirements........................................................................184
Using the Original Carton.....................................................................184
Using a Generic Carton.........................................................................185
Chapter 15. Oximeter Schematics...................................................... 187
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viii 10030881 Rev. B 12-2008 Service Manual

Service Manual 10030881 Rev. B 12-2008 9
1Safety Information
Overview
This section contains safety information requiring users to exercise appropriate
caution while using the OxiMax N-600x™ pulse oximeter.
Warnings are identified by the WARNING symbol shown above.
Warnings alert you to potential serious outcomes (death, injury, or adverse events) to
the patient or user.
Cautions are identified by the CAUTION symbol shown above.
Cautions alert the user to exercise care necessary for the safe and effective use of the
OxiMax N-600x pulse oximeter.
Notes are identified by the NOTE symbol shown above. Notes are listed before or
after procedural steps or information and provide additional guidelines or
information on the subject being described.
Warnings
WARNING
Only qualified service personnel should open the oximeter housing, remove and
replace components, or make adjustments. If your medical facility does not have a
qualified service technician, please contact Nellcor’s Technical Services or your local
Nellcor representative.
WARNING
Before attempting to open or disassemble the oximeter, disconnect the power cord to
avoid possible injury.

Safety Information
10 10030881 Rev. B 12-2008 Service Manual
WARNING
The OxiMax pulse oximetry sensor extrapolates from the date and time provided by
the Nellcor OxiMax N-600x pulse oximeter when recording the sensor event record to
the sensor. The accuracy of the date/time is determined by the date/time setting of the
pulse oximeter. Set the pulse oximeter date and time to the correct value before
connecting a record-enabled sensor to keep the date and time consistent for as long as
the sensor remains connected. Since a sensor with sensor event record data can be
transported from one oximeter to another, having discrepancies in the date/time
between oximeters and the sensor event record data will affect the order in which the
sensor event record data appear. To eliminate this potential problem, set all oximeters
within an institution to the same time.
WARNING
Explosion hazard—Do not use the OxiMax N-600x pulse oximeter in the presence of
flammable anesthetics.
WARNING
Do not spray, pour, or spill any liquid on the OxiMax N-600x pulse oximeter, its
accessories, connectors, switches, or openings in the chassis, since this may cause
damage to the oximeter.
WARNING
Supplemental oxygen will attenuate patterns of desaturation. A patient’s respiratory
compromise can be proportionally more severe before patterns appear in the
saturation trend. Remain vigilant when monitoring a patient on supplemental oxygen.
WARNING
The LCD panel contains toxic chemicals. Do not touch broken LCD panels. Physical
contact with a broken LCD panel can result in transmission or ingestion of toxic
substances.
WARNING
Do not silence or decrease the volume of the OxiMax N-600x pulse oximeter’s audible
alarm if patient safety could be compromised.
WARNING
Failure to cover the OxiMax pulse oximetry sensor site with opaque material in high
ambient light conditions may result in inaccurate measurements. Pulse oximetry
readings and pulse signals can be affected by certain environmental conditions,
OxiMax pulse oximetry sensor application errors, and certain patient conditions. See
the appropriate sections of this manual for specific safety information.
WARNING
The use of accessories, sensors, and cables other than those specified may result in
inaccurate readings of the OxiMax N-600x pulse oximeter and increased emission and/
or decreased electromagnetic immunity of the oximeter.
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Cautions
Service Manual 10030881 Rev. B 12-2008 11
WARNING
When installing the pulse oximeter’s AC power cord, ensure the cord is carefully
positioned to prevent tripping and entanglement.
Cautions
Caution
Observe standard ESD (electrostatic discharge) precautions when disassembling,
reassembling, and when handling any of the components of the oximeter.
Caution
When installing the OxiMax N-600x pulse oximeter power supply or the Main Board PCB,
tighten the seven screws (4-in lbs. maximum). Overtightening could strip out the screw
holes in the bottom case, rendering it unusable.
Caution
When reassembling the OxiMax N-600x pulse oximeter, tighten the screws that hold the
cases together (10-in lbs. maximum). Overtightening could strip out the screw holes in the
top case, rendering it unusable.
Caution
Signal artifact, secondary to a variety of external factors, may compromise the presence or
accuracy of the displayed oximeter values.
Caution
When connecting the OxiMax N-600x pulse oximeter to any instrument, verify proper
operation before clinical use. Both the pulse oximeter and the instrument connected to it
must utilize a grounded outlet. Accessory equipment connected to the pulse oximeter’s data
interface must be certified according to IEC Standard 60950 -1: 2005 for data-processing
equipment or IEC Standard 60601-1:1988 + A1:1991 + A2:1995 for electromedical
equipment. All combinations of equipment must be in compliance with IEC Standard
60601-1-1:2000 Requirements for Medical Electrical Systems. Anyone connecting additional
equipment to the signal input port or signal output port (data port connector) is configuring
a medical system and, therefore, is responsible for ensuring that the system complies with
the Requirements for Medical Electrical Systems IEC Standard 60601-1-1:2000 and the
electromagnetic compatibility IEC Standard 60601-1-2:2001 + A1:2004. Oximeter accuracy
may degrade if it is connected to secondary I/O devices when the equipment is not
connected to earth reference.
Caution
Federal law (U.S.A.) restricts this device to sale by or on the order of a physician.
Caution
Dispose of battery in accordance with local requirements and regulations.

Safety Information
12 10030881 Rev. B 12-2008 Service Manual

Service Manual 10030881 Rev. B 12-2008 13
2General Introduction
Overview
WARNING
The OxiMax N-600x pulse oximeter is intended only as an adjunct in patient
assessment. It must be used in conjunction with clinical signs and symptoms.
The N-600x Service Manual contains information for servicing the OxiMax N-600x™
pulse oximeter. Only qualified service personnel should service this product. Before
servicing the oximeter, thoroughly read the N-600x Operator's Manual for safe
operation. The latest version of this manual is available on the Internet at:
http://www.nellcor.com/serv/manuals.aspx
Related Documents
Before servicing the OxiMax N-600x pulse oximeter, read the N-600x Operator's
Manual. This will provide you with a basic understanding of the OxiMax N-600x pulse
oximeter principles of operation. This knowledge is essential in performing tests and
using circuit analysis sections to maintain the oximeter and troubleshoot oximeter
errors or malfunctions
Before attaching any of the various Nellcor approved OxiMax pulse oximetry sensors
to the oximeter, refer to the individual Directions for Use (DFU) and the OxiMax Sensor
Accuracy Grid (SAG).
The N-600x Operator’s and N-600x Service Manuals are posted on the Internet at:
http://www.nellcor.com/serv/manuals.aspx
A Spare Parts and Accessories list is also posted on the Internet at:
http://www.nellcor.com
Oximeter Description and Intended Use
Description
The OxiMax N-600x pulse oximeter provides continuous noninvasive monitoring of
functional oxygen saturation of arterial hemoglobin (SpO2) and pulse rate. With the
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General Introduction
14 10030881 Rev. B 12-2008 Service Manual
proper firmware, activation of the pulse oximeter’s OxiMax SPD™ Alert (SPD) feature
is possible.
Intended Use
The OxiMax N-600x pulse oximeter is intended for prescription use only with neonatal,
pediatric, and adult patients who are well or poorly perfused in hospitals, hospital-type
facilities, intra-hospital transport, and home environments. The OxiMax SPD™ Alert (SPD)
feature is intended only for facility-use care of adults to detect patterns of desaturation
indicative of repetitive reductions in airflow through the upper airway and into the
lungs.
Note:
Intended typical usage may be defined to include the following for the OxiMax N-600x pulse
oximeter:
•Hospital use typically covers such areas as general care floors (GCFs), operating rooms, special procedure
areas, intensive and critical care areas within the hospital and in hospital-type facilities. Hospital-type facilities
include physician office-based facilities, sleep labs, skilled nursing facilities, surgicenters, and sub-acute
centers.
•Intra-hospital transport includes transport of a patient within the hospital or hospital-type facility.
•Homecare use involves a lay person (parent or other similar non-critical caregiver) in the home environment.
Use with any particular patient requires the selection of an appropriate OxiMax pulse
oximetry sensor.
Through the use of the four softkeys, users can access trend information, change
alarm limits, adjust the internal time clock, select the communications protocol, and
choose the interface language native to the language of the facility, caregiver, or
user. See Using Oximeter Softkey Menus, page 64.
Figure 1. Front Panel Menu Softkeys
The oximeter can operate on AC power or on an internal battery. The controls and
indicators for the oximeter are illustrated and identified in OxiMax N-600x Pulse
Oximeter Front Panel, Figure 2 on page16 and OxiMax N-600x Pulse Oximeter Rear
Panel, Figure 3 on page21.

List of Components
Service Manual 10030881 Rev. B 12-2008 15
List of Components
The typical OxiMax N-600x pulse oximeter carton ships with the following packing
list of contents.
Table 1. Typical Packing List
Quantity Item
1 OxiMax N-600x pulse oximeter
1 Nellcor OxiMax pulse oximetry sensor or assortment pack
1 DOC-10 pulse oximetry cable
1N-600x Operator’s Manual (applicable to country of sale) and/or
compact disc
1 Hospital-grade power cord (applicable to country of sale)
2 Fuses, 0.5 A, 250 volts, slow-blow, IEC
(5 x 20 mm)
1N-600x Quick Guide

General Introduction
16 10030881 Rev. B 12-2008 Service Manual
Front Panel
Figure 2. OxiMax N-600x Pulse Oximeter Front Panel
User Interface
Note:
Pressing a key, except the ON/STANDBY key, should result in either a valid or an invalid tone.
If the key pressed fails to emit a tone, contact a qualified service technician.
ON/STANDBY Key—Use to turn the oximeter on and off
ALARM SILENCE Key —Use to silence ANY current alarms for the alarm silence
duration period. After silencing an alarm, press the key again to reactivate the alarm.
Additionally, use it to view and adjust alarm silence duration and alarm volume. The
ALARM SILENCE key clears “SENSOR OFF,” “LOW BATTERY,” and “SENSOR DISCONNECT”
Table 2. List of Front Panel Components
1SpO2Sensor Port 14 ADJUST UP & DOWN Keys
2Low Battery Indicator 15 Pulse Rate (BPM) Upper Limit Value
3AC Power Indicator 16 Pulse Rate (BPM) Lower Limit Value
4ON/STANDBY Key 17 Neonate Mode Icon
5Battery Fuel Gauge 18 HELP/CONTRAST Key
6SatSeconds™ Icon & Limit Value 19 Fast Response Mode Icon
7SPD Icon & Sensitivity Value 20 Pulse Rate (BPM)
8Blip Bar 21 Menu Selection Softkeys
9%SpO2Real-time Value 22 Menu Bar
10 %SpO2Upper Limit Value 23 Data In-Sensor Indicator
11 %SpO2Lower Limit Value 24 Interference Indicator
12 Alarm Silence Indicator 25 Pulse Search Indicator
13 ALARM SILENCE Key 26 Oximeter Speaker
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Front Panel
Service Manual 10030881 Rev. B 12-2008 17
messages from the display. It lights continuously when an audible alarm has been
silenced. It flashes when the alarm silence duration has been set to OFF.
WARNING
Pressing ALARM SILENCE will keep ALL alarms from sounding for the alarm silence
duration period.
WARNING
Should the caregiver silence an SPD alarm, this resets the index that tracks repetitive
patterns of desaturation and silences ALL alarms.
Should the caregiver fail to clear a primary audible alarm within two (2) minutes, a secondary
alarm with a unique pitch sounds.
ADJUST UP Key —Use to increase variable parameters of the oximeter.
ADJUST DOWN Key—Use to decrease variable parameters of the oximeter.
HELP/CONTRAST Key—Use to access the on-screen help or adjust the screen
contrast.
•Press and release the HELP/CONTRAST softkey to launch on-screen help.
•Press and hold the HELP/CONTRAST softkey while simultaneously pressing the ADJUST UP and
ADJUST DOWN softkeys to increase or decrease the contrast of the display screen.
Softkey Menu Bar—Use to display the current softkey menu functions.
Oximeter Visual Indicators
AC Power Indicator—Lights continuously when connected to an AC power source
and also shows when the battery is charging. Does not light when the oximeter is
running on the internal battery.
Low Battery Indicator— Lights continuously when 15 or fewer minutes of battery
capacity remain, then flashes when the battery capacity reaches a critically low
condition.
Pulse Search Indicator—Lights continuously prior to initial acquisition of a pulse
signal and during prolonged, challenging monitoring conditions. The pulse search
indicator flashes during a loss-of-pulse signal.
Interference Indicator—Lights whenever the oximeter algorithm detects the
incoming signal quality is degraded. An intermittently lit Interference Indicator is
common during patient monitoring, and indicates the oximeter algorithm is
dynamically adjusting the amount of data required for measuring SpO2and Pulse
Rate. When lit continuously, the oximeter algorithm has extended the amount of
data required for measuring SpO2and Pulse Rate. In this case, fidelity in tracking
rapid changes in these values may be reduced.
Note:
Degradation can be caused by ambient light, poor sensor placement, electrical noise,
electro-surgical interference, patient activity, or other causes.

General Introduction
18 10030881 Rev. B 12-2008 Service Manual
Data In-Sensor Indicator—Lights to indicate that the attached OxiMax pulse
oximetry sensor contains a patient sensor event record. The sensor event record
information may be viewed or printed.
Battery Fuel Gauge—Displays the battery charge remaining on the oximeter. The
battery fuel gauge consists of four bars, each corresponding to approximately 1.5
hours of operating time. All four bars are lit when the battery is fully charged. No bars
are lit when a low battery condition exists. Visible in all display views. See Battery Fuel
Gauge Levels, page 55.
Plethysmographic (pleth) Waveform—This non-normalized waveform uses real-
time sensor signals, reflecting relative pulsatile strength and quality of incoming
signals. This indicator is only available in the pleth display view.
Pulse Amplitude (blip bar)—Indicates pulse beat and the relative (non-normalized)
pulse amplitude. As the detected pulse becomes stronger, more bars light with each
pulse. This indicator is only available in the blip and general care format (GCF) display
views.
%SpO2 Value—Indicates hemoglobin oxygen saturation levels. The display value
flashes zeros during loss-of-pulse alarms and flashes the %SpO2value when the
SpO2is outside the alarm limits. The oximeter continues to update the display during
Pulse Search. Current upper and lower alarm limit settings appear as smaller values
to the right of the dynamic %SpO2value. Visible in all display views.
Pulse Rate Value—Displays the pulse rate in beats per minute. It flashes during
loss-of-pulse alarms and when the pulse rate is outside of the alarm limits. During
Pulse Search, the oximeter continues to update the display. Pulse rates outside of the
pulse rate range of 20 to 250 bpm are displayed as 0 and 250, respectively. Current
upper and lower alarm limit settings appear as smaller values to the right of the
dynamic pulse rate value. Visible in all display views.
Saturation Pattern Detection (SPD) Icon—The OxiMax SPD™ Alert (SPD) feature
detects patterns of desaturation in the SpO2trend in adults. When the SPD feature is
enabled, the oximeter detects patterns of desaturation indicative of repetitive
reductions in airflow through a patient’s upper airway into the lungs. When the SPD
feature detects patterns of desaturation in the SpO2trend in adults, caregivers are
alerted to these patterns via a visual indicator, and optionally, an audio alarm. The
triangle icon for OxiMax SPD™ Alert appears on the monitor display when the feature
is enabled. The triangle fills from the bottom to the top as patterns become more
severe. The triangle empties from top to bottom as the patterns become less severe.
If the triangle fills, an alarm sounds. With Saturation Pattern Detection enabled, the
default setting is On with the sensitivity set to 1. The feature can be turned off in the
LIMITS menu. Caregivers can select from three alarm sensitivity settings: 1 (most
sensitive), 2 (medium sensitivity) or 3 (least sensitive), with 1 resulting in more alarms
and 3 resulting in fewer alarms. The rate at which the SPD icon fills depends on the
SPD sensitivity setting. To explore activation, contact Nellcor’s Technical Services
Department at 1.800.635.5267 or your local Nellcor representative. To use the
feature, reference the N-600x Operator’s Manual.

Front Panel
Service Manual 10030881 Rev. B 12-2008 19
SatSeconds Icon—The SatSeconds feature provides alarm management for mild or
brief SpO2limit violations. When the SatSeconds feature is enabled, the SatSeconds
circle icon fills in the clockwise direction as the SatSeconds alarm management
system detects SpO2readings outside of the limit setting. The SatSeconds icon
empties in counterclockwise direction when SpO2readings are within limits. When
the SatSeconds icon reaches full, a medium priority alarm sounds. Visible in all
display views. For more information about using the feature, reference the N-600x
Operator’s Manual.
Fast Response Mode Icon—Appears at bottom right of the menu bar when
enabled. The oximeter algorithm responds to changes in the SpO2data at differing
rates: two to four seconds in Fast Mode and five to seven seconds in Normal Mode
when calculating %SpO2. The response mode setting does not affect the algorithm’s
calculation of pulse rate, nor does it influence the recording of trend data, which
both occur at one-second intervals. The response mode, however, may impact the
SPD alarm behavior. Visible in all display views when enabled. For more information
about using the feature, reference the N-600x Operator’s Manual.
Neonate Mode Icon—Appears at the bottom far right of the menu bar when
enabled. Visible when the alarm limits are set to neonate limit values, but not when
set to adult limit values. For more information about using the feature, reference the
N-600x Operator’s Manual.
Monitoring Values
WARNING
Failure to cover the OxiMax pulse oximetry sensor site with opaque material in high
ambient light conditions may result in inaccurate measurements.
The OxiMax N-600x pulse oximeter continuously assesses the quality of the pulse
oximetry signal while monitoring patient SpO2and pulse rate. Oximeter front panel
values reflect the data derived from monitoring.
The N-600x pulse oximeter algorithm automatically extends the amount of data
required for measuring SpO2and pulse rate depending on the measurement
conditions.
•Normal conditions—During normal measurement conditions the averaging time is six
to seven seconds (approximately three seconds in Fast Mode).
•Brief abnormal conditions—During conditions such as those caused by low perfusion,
interference (e.g., external interference like ambient light), or a combination of these, the
oximeter automatically extends the amount of data required beyond seven seconds. If
the resulting dynamic averaging time exceeds 20 seconds, the pulse search indicator is lit
solid and %SpO2and Pulse Rates update every second.
•More severe conditions—As these conditions extend, the required amount of data
continues to increase. If the dynamic averaging time reaches 40 seconds, the pulse search
indicator flashes to denote a loss-of-pulse condition and %SpO2and pulse rate flash
values of zero. This activates the audible alarm state.
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General Introduction
20 10030881 Rev. B 12-2008 Service Manual
Audible Indicators
Audible indicators include pitched tones and beeps. Caregivers may choose to
silence alarms by pressing the ALARM SILENCE key.
WARNING
Pressing ALARM SILENCE will keep ALL alarms from sounding for the alarm silence
duration period.
Caution
Should the caregiver fail to clear a primary audible alarm within two (2) minutes, a secondary
alarm with a unique pitch sounds.
Table 3. Audible Indicator Functions
Function Description
Alarm Silence Reminder Three beeps sound approximately every three minutes with the alarm silence duration set
to OFF and the alarm silence reminder function enabled.
Piezo Tone A high-pitched piezo tone sounds if there is no user response to an audible alarm, or if the
oximeter detects a failure of the primary speaker.
Pulse Beep Single beep sounds for each detected pulse. The pitch of the pulse beep signal changes
with a point-by-point rise or fall in the saturation level.
High Priority Alarm High-pitched, fast-pulsing tone indicates loss-of-pulse.
Note: If a High Priority Alarm is not silenced within 30 seconds by pressing the
ALARM SILENCE key, the oximeter increases the urgency level of the audible alarm
signal by alternating a piezo tone with the primary alarm tone.
Medium Priority Alarm Medium-pitched, pulsing tone indicates an SpO2or pulse rate limit violation.
Note: If a Medium Priority Alarm is not silenced within two minutes by pressing the
ALARM SILENCE key, the oximeter increases the urgency level of the audible alarm
signal by alternating a piezo tone with the primary alarm tone.
Low Priority Alarm Low-pitched, slow-pulsing tone at 3.5 second intervals indicates an OxiMax pulse
oximetry sensor disconnect, low battery, or oximeter failure.
Note: If a Low Priority Alarm is not silenced within two minutes by pressing the
ALARM SILENCE key, the oximeter increases the urgency level of the audible alarm
signal by alternating a piezo tone with the primary alarm tone.
SPD Alarm A trio of quick high-, medium-, high-pitched tones at 2.5 second intervals
High Alarm A pair of quick medium-pitched tones followed by a high-pitched pulsing tone at 2.5
second intervals
Power-On Self-Test Pass One-second tone indicates the oximeter has been turned on and has successfully
completed the power-on self-test.
Confirmation Tone Three beeps sound to confirm default settings are either saved or reset to factory defaults,
or the trend data has been deleted.
Invalid Softkey Press Quick, low-pitched tone indicates a softkey has been pressed that is inappropriate for the
current state of the oximeter.
Valid Softkey Press Quick, medium-pitched tone indicates appropriate softkey has been pressed.
Volume Setting Tone Continuous tone indicates alarm volume adjustment.