Nellcor N-3000 User manual

SERVICE MANUAL

Nellcor Symphony

®

N-3000 Patient Monitor
SpO2, ECG, and Respiration Capabilities

To contact Nellcor Puritan Bennett’s representative: In the United States, call 1-800-NELLCOR or 510 463-4000;

outside the United States, call your local Nellcor Puritan Bennett representative.

Caution: Federal law (U.S.) restricts this device to sale by or on the order of a physician.

© 1996 Nellcor Puritan Bennett Incorporated. All rights reserved. 035071A-1096

Corporate Headquarters

Regional/Local Offices

Nellcor Puritan Bennett Inc.
4280 Hacienda Drive
Pleasanton, California 94588 U.S.A.
Tel. [phone] or
1-800-NELLCOR
Fax [phone]

U.S. Service Repair Center

Nellcor Puritan Bennett Inc.
2391 Fenton Street
Chula Vista, California 91914
U.S.A.
Tel. [phone]

European Office

Nellcor Puritan Bennett Europe BV
Hambakenwetering 1
5231 DD ’s-Hertogenbosch
The Netherlands
Tel. [phone]

Asia/Pacific Office

Nellcor Puritan Bennett HK Ltd.
Room 1602 Evergo House
38 Gloucester Road
Wanchai
Hong Kong
Tel. [phone]

Nellcor Puritan Bennett UK Ltd.
10, Talisman Business Centre
London Road
Bicester
Oxfordshire OX6 0JX
United Kingdom
Tel. [phone]

Nellcor Puritan Bennett Belgium NV/SA
Interleuvenlaan 62/8, Zone 2
B-3001 Heverlee
Belgium
Tel. [phone]

Nellcor Puritan Bennett France
21 rue Albert Calmette
78353 Jouy-en-Josas Cedex
France
Tel. [phone]

Nellcor Puritan Bennett Germany GmbH
Black-&-Decker-Strasse 28
65510 Idstein
Germany
Tel. [phone]

Nellcor Puritan Bennett Italia Srl
Via dei Tulipani, 3
20090 Pieve Emanuele (MI)
Italy
Tel. [phone]

To obtain information about a warranty, if any, for this product, contact Nellcor Puritan Bennett
Technical Services or your local Nellcor Puritan Bennett 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.

Nellcor Puritan Bennett, Durasensor, Nellcor Symphony, Oxisensor II, and the Nellcor Puritan
Bennett knob configuration are trademarks of Nellcor Puritan Bennett Incorporated.

Covered by one or more of the following U.S. Patents and foreign equivalents: 4,621,643;
4,653,498; 4,700,708; 4,770,179; 4,869,254; 5,078,136; 5,351,685; and 5,368,026.

TABLE OF CONTENTS

List of Figures
List of Tables

Section 1: Introduction........................................................................... 1-1

1.1 Manual Overview ..................................................................... 1-1

1.2 N-3000 Patient Monitor Description .......................................... 1-1

1.3 Related Documents.................................................................. 1-2

Section 2: Routine Maintenance............................................................ 2-1

2.1 Cleaning................................................................................... 2-1

2.2 Periodic Safety and Functional Checks..................................... 2-1

2.3 Batteries................................................................................... 2-1

Section 3: Performance Verification...................................................... 3-1

3.1 Introduction .............................................................................. 3-1

3.2 Equipment Needed................................................................... 3-1

3.3 Performance Tests................................................................... 3-2

3.4 Safety Tests............................................................................. 3-19

Section 4: Configuration Mode, Service Mode, and Alarm

Active Function....................................................................................... 4-1

4.1 Introduction .............................................................................. 4-1

4.2 Configuration Mode.................................................................. 4-1

3.3.1 Battery Charge........................................................... 3-2

3.3.2 Battery Performance Test .......................................... 3-2

3.3.3 Power-up Performance............................................... 3-3

3.3.3.1 Power-On Self-Test.................................................... 3-3

3.3.3.2 Adult Power-On Defaults and Alarm Limit Ranges...... 3-4

3.3.3.3 Neonate Power-On Defaults and Alarm Limit Ranges 3-6

3.3.4 Hardware and Software Tests..................................... 3-7

3.3.4.1 Operation with a Pulse Oximeter Tester..................... 3-7

3.3.4.2 Operation with an ECG Simulator............................... 3-11

3.3.4.3 Operation with a Respiration Simulator ...................... 3-13

3.3.4.4 General Operation...................................................... 3-13

3.3.4.5 ECG Cable Test......................................................... 3-19

3.4.1 Ground Integrity ......................................................... 3-19

3.4.2 Electrical Leakage...................................................... 3-19

3.4.2.1 Chassis Source Current.............................................. 3-20

3.4.2.2 Patient Source Current............................................... 3-21

3.4.2.3 Patient Sink Current................................................... 3-22

4.2.1 Adult/Neonatal Mode Default...................................... 4-2

4.2.2 Default SpO2 Upper Alarm Limit ................................ 4-2

4.2.3 Default SpO2 Lower Alarm Limit................................. 4-3

4.2.4 Default Heart/Pulse Rate Upper Alarm Limit .............. 4-3

4.2.5 Default Heart/Pulse Rate Lower Alarm Limit............... 4-3

4.2.6 Default Respiration Rate Upper Alarm Limit............... 4-4

4.2.7 Default Respiration Rate Lower Alarm Limit............... 4-4

4.2.8 Default Alarm Volume................................................ 4-4

4.2.9 Default Alarm Silence Duration .................................. 4-4

4.2.10 Configuration Menu.................................................... 4-5

4.2.10.1 Pulse Tone Volume................................................... 4-6

4.2.10.2 UIF Software Version Report..................................... 4-6

4.2.10.3 SpO2 Software Version Report .................................. 4-6

4.2.10.4 Serial Port Baud Rate................................................ 4-6

4.2.10.5 Trend Type................................................................ 4-7

iii

Table of Contents

4.2.10.6 Reset to Factory Defaults .......................................... 4-7

4.2.10.7 Primary Heart/Pulse Rate Source.............................. 4-7

4.2.10.8 Primary Pulse Tone Source....................................... 4-8

4.2.10.9 ECG Lead Selection.................................................. 4-8

4.2.10.10 ECG Pacer Filter Status .......................................... 4-8

4.2.10.11 ECG Low Frequency Filter Status............................ 4-9

4.2.10.12 ECG Software Version Report ................................. 4-9

4.2.10.13 Respiration Noise Timeout....................................... 4-9

4.2.10.14 Respiration Sensitivity Selection.............................. 4-10

4.3 Service Mode........................................................................... 4-10

4.3.1 Menu Item 1: Software Version Report....................... 4-13

4.3.2 Menu Item 2: Knob and Lamp Test............................. 4-14

4.3.3 Menu Item 3: Button Test........................................... 4-14

4.3.4 Menu Item 4: Speaker Test........................................ 4-15

4.3.5 Menu Item 5: Internal Configuration Code (ICC)

Report........................................................................ 4-15

4.3.6 Menu Item 6: Total Operating Hours Report............... 4-16

4.3.7 Menu Items 7-16: Error Log Record Report................ 4-16

4.3.8 Menu Item 17: Instrument Identification (IID) Report .. 4-16

4.3.9 Menu Item 18: Power Status ...................................... 4-17

4.3.10 Menu Item 19: Persistent Time Sense Report ............ 4-17

4.3.11 Menu Item 20: Reset to Factory Defaults.................... 4-18

4.3.12 Menu Item 21: Initial Cluster Instrument Number

Report........................................................................ 4-18

4.3.13 Menu Item 22: Latching Alarms.................................. 4-18

4.3.14 Menu Item 23: Enable/Disable Alarm Silence

Reminder................................................................... 4-19

4.3.15 Menu Item 25: Dump EEPROM Data ......................... 4-19

4.3.16 Menu Item 28: Enable/Disable Battery Charge

Circuit ........................................................................ 4-20

4.3.17 Menu Item 29: Instrument Compatibility Report.......... 4-20

4.3.18 Menu Item 30: SpO2 RCAL Report............................. 4-20

4.3.19 Menu Item 31: SpO2 IR and Red Offset Report.......... 4-21

4.3.20 Menu Item 32: SpO2 Corrected IR and Red Signals

Report........................................................................ 4-21

4.3.21 Menu Item 33: SpO2 IR LED Drive Test ..................... 4-21

4.3.22 Menu Item 34: SpO2 Red LED Drive Test .................. 4-22

4.3.23 Menu Item 35: SpO2 DM-Gain Test............................ 4-23

4.3.24 Menu Item 36: SpO2 P-Gain Test............................... 4-23

4.3.25 Menu Item 37: Set SpO2 Analog Test Mode............... 4-24

4.3.26 Menu Item 38: SpO2 A/D-Cal Line Test...................... 4-24

4.3.27 Menu Item 39: SpO2 Enable Automatic Operation...... 4-25

4.3.28 Menu Item 40: Set ECG Lead .................................... 4-25

4.3.29 Menu Item 41: Set ECG Pacer Filter .......................... 4-25

4.3.30 Menu Item 42: Set ECG Low Frequency Filter............ 4-26

4.3.31 Menu Item 43: Set ECG Baseline Reset..................... 4-26

4.3.32 Menu Item 44: ECG POST Test Signal ...................... 4-26

4.3.33 Menu Item 45: Check ECG Cable Off Detection......... 4-27

4.3.34 Menu Item 46: Check ECG Lead Off Detection .......... 4-27

4.3.35 Menu Item 47: Display ECG Output Value.................. 4-28

4.3.36 Menu Item 49: ECG Enable Automatic Operation....... 4-28

4.3.37 Menu Item 51: Set Respiration Baseline Reset........... 4-29

4.3.38 Menu Item 53: Display Respiration Output Value........ 4-29

4.3.39 Menu Item 54: Enable/Disable Respiration

Monitoring.................................................................. 4-30

iv

Table of Contents

4.3.40 Menu Item 55: Enable/Disable Breath Pulses............. 4-30

4.3.41 Menu Item 56: Respiration Enable Automatic

Operation................................................................... 4-31

4.3.42 Menu Item 60: Set Serial Port Baud Rate................... 4-31

4.3.43 Menu Item 61: Serial Port Loop Back Test ................. 4-31

4.3.44 Menu Item 62: Serial Port Transmit Test .................... 4-32

4.4 Alarm Active Function.............................................................. 4-32

Section 5: Troubleshooting ................................................................... 5-1

5.1 Introduction .............................................................................. 5-1

5.2 How to Use this Section............................................................ 5-1

5.3 Who Should Perform Repairs................................................... 5-1

5.4 Replacement Level Supported.................................................. 5-1

5.5 Obtaining Replacement Parts................................................... 5-1

5.6 Troubleshooting guide.............................................................. 5-2

5.6.1 Power......................................................................... 5-3

5.6.2 Error Codes................................................................ 5-4

5.6.2.1 User-Correctable Error Codes .................................... 5-4

5.6.2.2 Failure Error Codes.................................................... 5-4

5.6.3 Buttons/Knob.............................................................. 5-7

5.6.4 Display/Alarms........................................................... 5-8

5.6.5 Operational Performance........................................... 5-9

5.6.6 Stacked Operation ..................................................... 5-10

5.6.7 Serial Port.................................................................. 5-12

Section 6: Disassembly Guide............................................................... 6-1

6.1 Introduction .............................................................................. 6-1

6.2 Removing the Battery............................................................... 6-2

6.3 Battery Replacement................................................................ 6-3

6.4 Fuse Replacement ................................................................... 6-4

6.5 Monitor Disassembly ................................................................ 6-4

6.5.1 Communications Board Switch Settings..................... 6-5

6.6 Removing the Alarm Speaker................................................... 6-6

6.7 Removing the SpO2 PCB and SpO2 Controller PCB................. 6-6

6.8 Removing the Communications PCB........................................ 6-7

6.9 Removing the ECG PCB and ECG Controller PCB .................. 6-8

6.10 Removing the UIF PCB and Display PCB................................. 6-8

6.10.1 Installing a Replacement UIF PCB ............................. 6-9

6.11 Control Knob Assembly Replacement....................................... 6-10

6.12 Lithium Battery Replacement.................................................... 6-11

6.13 Reassembly.............................................................................. 6-11

Section 7: Spare Parts............................................................................ 7-1

7.1 Introduction .............................................................................. 7-1

Section 8: Packing for Shipment........................................................... 8-1

8.1 General Instructions ................................................................. 8-1

8.2 Repacking in Original Carton.................................................... 8-1

8.3 Repacking in a Different Carton................................................ 8-2

Section 9: Specifications........................................................................ 9-1

9.1 General.................................................................................... 9-1

9.2 Electrical .................................................................................. 9-1

9.3 Physical Characteristics............................................................ 9-2

9.4 Environmental.......................................................................... 9-2

9.5 Alarms...................................................................................... 9-2

9.6 Factory Default Settings........................................................... 9-2

9.7 Performance............................................................................. 9-3

v

Table of Contents

Appendix................................................................................................. A-1

A1 Error Types .............................................................................. A-1

A2 User-Correctable Error Codes................................................... A-2

A3 Failure Error Codes .................................................................. A-2

A4 Internally Corrected Error Codes .............................................. A-3

Technical Supplement............................................................................ S-1

S1 Introduction .............................................................................. S-1

S2 Oximetry Overview................................................................... S-1

S2.1 Automatic Calibration................................................. S-1

S2.2 Functional Versus Fractional Saturation..................... S-2

S2.3 Measured Versus Calculated Saturation..................... S-2

S3 Stackbus Interconnect .............................................................. S-2

S4 Circuit Analysis......................................................................... S-3

S4.1 Functional Overview .................................................. S-3

S4.2 Circuit Description...................................................... S-4

S4.2.1 SpO2 Module ............................................................. S-4

S4.2.2 ECG/Respiration Module............................................ S-6

S4.2.3 UIF Module ................................................................ S-9

S4.2.4 SpO2 Controller.......................................................... S-16

S4.2.5 ECG Controller........................................................... S-18

S4.2.6 Communications Submodule...................................... S-19

S4.2.7 Display Board............................................................. S-21

S.5 Schematic Diagrams ................................................................ S-22

vi

LIST OF FIGURES

LIST OF TABLES

Table of Contents

1-1 N-3000 Front Panel ...................................................................... 1-2

3-1 Self-Test Display .......................................................................... 3-3

3-2 Serial Port Interface...................................................................... 3-15

3-3 Serial Port Connector - External Pin Locations ............................. 3-16

3-4 Battery Cover Removal ................................................................ 3-17

3-5 Speaker Test................................................................................ 3-18

3-6 ECG Cable Pin Locations............................................................. 3-19

4-1 Serial Port Pin Locations .............................................................. 4-33

6-1 Battery Replacement.................................................................... 6-2

6-2 Removing the Battery................................................................... 6-3

6-3 N-3000 Fuses............................................................................... 6-4

6-4 N-3000 Corner Screws.................................................................. 6-4

6-5 Opening the N-3000 Monitor......................................................... 6-5

6-6 Handle, Left Side Panel, and Speaker Disassembly...................... 6-6

6-7 Rear Panel and SpO2 Module Disassembly.................................. 6-7

6-8 Communications PCB Removal.................................................... 6-8

6-9 Display PCB and UIF PCB Disassembly....................................... 6-9

6-10 Knob Encoder Disassembly .......................................................... 6-10

6-11 Knob Disassembly........................................................................ 6-10

7-1 N-3000 Expanded View ................................................................ 7-2

8-1 Repacking the N-3000.................................................................. 8-1

S2-1 Oxyhemoglobin Dissociation Curve.............................................. S-2

S4-1 N-3000 Functional Block Diagram ................................................ S-4

S4-2 Timing Diagram............................................................................ S-5

S4-3 Internal/External Stackbus Connections........................................ S-13

S4-4 Communications Sub module Block Diagram............................... S-20

S4-5 Display Board Block Diagram ....................................................... S-21

3-1 Dynamic Operating Ranges........................................................... 3-9

3-2 Serial Port Voltages....................................................................... 3-16

3-3 ECG Cable Resistances................................................................ 3-20

4-1 Configuration Mode Menu ............................................................. 4-2

4-2 Configuration Menu....................................................................... 4-5

4-3 Service Mode Steady State - Main Menu....................................... 4-12

5-1 Problem Categories....................................................................... 5-2

5-2 Power Problems............................................................................ 5-3

5-3 N-3000 Failure Error Codes........................................................... 5-5

5-4 Buttons/Knob Problems................................................................. 5-7

5-5 Display/Alarms Problems .............................................................. 5-8

5-6 Operational Performance Problems............................................... 5-9

5-7 Stack Problems............................................................................. 5-10

5-8 Serial Port Problems ..................................................................... 5-12

A-1 Error Types ................................................................................... A-1

A-2 N-3000 User-Correctable Error Codes........................................... A-2

A-3 N-3000 Failure Error Codes........................................................... A-2

A-4 N-3000 Internally Corrected Error Codes....................................... A-3

S4-1 J13 Inter Stack Connector ............................................................. S-9

S4-2 J8 Connector................................................................................. S-14

S4-3 J12, J22 Inter Module Connector................................................... S-15

S4-4 J5 Display Connector .................................................................... S-16

S4-5 J2 Speaker Connector................................................................... S-16

S4-6 J3 Knob Connector........................................................................ S-16

vii

SECTION 1: INTRODUCTION

1.1 Manual Overview

1.2 N-3000 Patient Monitor Description

1.3 Related Documents

1.1 MANUAL OVERVIEW

This manual contains information for servicing the Nellcor Symphony
model N-3000 patient monitor. Only qualified service personnel should service
this product. Before servicing the N-3000, read the operator’s manual carefully
for a thorough understanding of operation.

1.2 N-3000 PATIENT MONITOR DESCRIPTION

The purpose and function of the Nellcor Symphony N-3000 patient monitor is to
noninvasively and continuously monitor functional arterial oxygen saturation,
ECG, pulse rate, heart rate, and respiration rate for adult, pediatric, and neonatal
patients in all hospital areas and hospital-type facilities. It may be used for
hospital transport when powered by its internal battery.

The N-3000 can operate as a standalone monitor or it can be connected to
(stacked with) other Nellcor Symphony instruments, such as the N-3100 blood
pressure monitor and N-3200 display/printer. When used with the N-3200
display/printer, the instruments can display and print out ECG, respiration, and
plethysmographic waveforms and SpO2, pulse rate, heart rate, and respiration
rate tabular data.

The physical and operational characteristics of the monitor are described in the
operator’s manual and Section 9, Specifications, of this manual.

Figure 1-1 depicts the front panel of the N-3000 and the names of its displays
and controls.

1-1

Section 1: Introduction

Figure 1-1: N-3000 Front Panel

1. SpO2% display 11. PRINT button

2. PULSE AMPLITUDE indicator 12. BATTERY IN USE/BATTERY LOW
indicator

3. ECG HEART RATE indicator 13. BATTERY CHARGING indicator

4. HEART/PULSE RATE display 14. LINKED indicator*

5. RESPIRATION RATE display 15. RF LOCKED indicator*

6. NEONATAL MODE indicator 16. LOWER ALARM LIMIT button

7. AUDIBLE ALARM OFF indicator 17. UPPER ALARM LIMIT button

8. ON/STANDBY button 18. LEADS OFF indicator

9. POWER ON indicator 19. PULSE SEARCH indicator

10. STACKED indicator 20. PATIENT MOTION indicator

* Not used on this model

1.3 RELATED DOCUMENTS

To perform test and troubleshooting procedures and to understand the principles
of operation and circuit analysis sections of this manual, you must know how to
operate the monitor. Refer to the N-3000 operator’s manual. To understand the
various Nellcor Puritan Bennett sensors and ECG leads that work with the
monitor, refer to the individual sensor or leads directions for use.

1-2

SECTION 2: ROUTINE MAINTENANCE

2.1 Cleaning

2.2 Periodic Safety and Functional Checks

2.3 Batteries

2.1 CLEANING
Caution: Do not immerse the N-3000 or its accessories in liquid or clean

with caustic or abrasive cleaners. Do not spray or pour any liquid on the
monitor or its accessories.

To clean the N-3000, dampen a cloth with a commercial, nonabrasive cleaner
and wipe the exterior surfaces lightly. Do not allow any liquids to come in contact
with the power connector, fuse holder, or switches. Do not allow any liquids to
penetrate connectors or openings in the instrument cover. Wipe sensor and ECG
lead extension cables with a damp cloth. For sensors and ECG leads, follow the
individual directions for use.

2.2 PERIODIC SAFETY AND FUNCTIONAL CHECKS

The following checks should be performed at least every 2 years by a qualified
service technician.

1. Inspect the exterior of the N-3000 for damage.

2.3 BATTERIES

2. Inspect safety labels for legibility. If the labels are not legible, contact

Nellcor Puritan Bennett’s Technical Services Department or your local
Nellcor Puritan Bennett representative.

3. Verify that the unit performs properly as described in paragraph 3.3.

4. Perform the electrical safety tests detailed in paragraph 3.4. If the unit fails

these electrical safety tests, do not attempt to repair. Contact Nellcor
Puritan Bennett’s Technical Services Department or your local Nellcor
Puritan Bennett representative.

5. Inspect the fuses for proper value and rating (F1: 1.0 Amp, 250 Volt, Slo-

Blow and F2: 2.5 Amp, 250 Volt, Slo-Blow) as discussed in paragraph 6.4.

Nellcor Puritan Bennett recommends replacing instrument batteries at least
every 2 years. To replace the batteries, refer to Section 6, Disassembly Guide.

If the N-3000 has been stored for more than 30 days, charge the battery as
described in paragraph 3.3.1. A fully discharged battery requires 14 hours of
charging time for a full charge. A 6-hour charge is required for 1 hour of
operating time.

2-1

SECTION 3: PERFORMANCE VERIFICATION

3.1 Introduction

3.2 Equipment Needed

3.3 Performance Tests

3.4 Safety Tests

3.1 INTRODUCTION

This section discusses the tests used to verify performance following repairs or
during routine maintenance. All tests can be performed without removing the N­3000 cover. All tests except the battery charge and battery performance tests
must be performed as the last operation before the monitor is returned to the
user.

If the N-3000 fails to perform as specified in any test, repairs must correct the
problem before the monitor is returned to the user.

3.2 EQUIPMENT NEEDED

Equipment Description

AC power adapter Use an appropriate Nellcor Symphony

SPS-N1 or PSS-1 power supply.
Connector adapter 6-pin, “D”
Digital multimeter (DMM) Fluke Model 87 or equivalent

Durasensor

®

oxygen transducer DS-100A

ECG cable SCE-10
ECG electrodes standard
ECG leads SLE series
ECG simulator Dynatech Nevada, medSim 300 or

equivalent

Oxisensor® II oxygen transducer D-25

Pulse oximeter tester SRC-2
Respiration simulator Dynatech Nevada, medSim 300 or

equivalent
Safety analyzer Must meet current AAMI

specifications
Sensor cable SCP-10
Serial interface cable EIA-232 cable (optional)
Stopwatch Manual or electronic

3.3 PERFORMANCE TESTS

The battery charge procedure should be performed before monitor repairs
whenever possible. It should also be performed before and after performing the
battery performance test (paragraph 3.3.2).

3-1

Section 3: Performance Verification

This section is written using Nellcor Puritan Bennett factory-set defaults. If your
institution has preconfigured custom defaults, those values will be displayed.
Factory defaults can be reset using the configuration mode procedure described
in paragraph 4.2.10.6.

3.3.1 Battery Charge

Perform the following procedure to fully charge the battery.

1. Connect the monitor to an AC power source using an external power supply.

2. Verify that the monitor is off and that the BATTERY CHARGING indicator is

lit.

3. Charge the battery for at least 14 hours.

Note: The BATTERY CHARGING indicator is programmed to go out

when the N-3000 has been connected to AC power for
approximately 14 hours with no power interruptions. If there are
any power interruptions, the 14-hour charging period begins again
when power is restored.

4. The only way to check for a full charge is to perform the procedure in

paragraph 3.3.2 “Battery Performance Test.”

3.3.2 Battery Performance Test

The monitor is specified to operate on battery power a minimum of 4 hours.
(This time may decrease if the N-3000 is operating in the stacked configuration
with an N-3100 or N-3200.) Before performing this test, ensure that the battery is
fully charged (paragraph 3.3.1).

1. Connect the Nellcor Puritan Bennett SRC-2 pulse oximeter tester to the

monitor via the SCP-10 sensor cable.

2. Set the SRC-2 switches as follows:

SWITCH POSITION

RATE 38
LIGHT LOW
MODULATION LOW
RCAL/MODE RCAL 63/LOC

An illuminated BATTERY CHARGING indicator is not necessarily
an indication that the battery contains less than a full charge. It is
merely used as a timer to indicate that the battery has been
continuously charging for less than 14 hours.

3-2

3. Ensure that the monitor is not connected to AC power.

4. With the N-3000 turned off, press the ON/STANDBY button and verify that

the BATTERY IN USE/BATTERY LOW indicator lights after the power-on
self-test is completed. Verify that the monitor is responding to the simulator
signal and the audible alarm is sounding. Do not silence the alarm during
this test.

5. The monitor must operate for at least 4 hours.

6. Verify that the BATTERY IN USE/BATTERY LOW indicator will start to

flash after about 3.5 to 3.75 hours (15-30 minutes before the battery fully
discharges).

7. Allow the monitor to operate until it automatically powers down due to the

low battery.

8. If the monitor passes this test, immediately recharge the battery (paragraph

3.3.1, steps 1 - 3).

3.3.3 Power-up Performance

The power-up performance tests (3.3.3.1 through 3.3.3.3) verify the following
monitor functions:

Section 3: Performance Verification

• 3.3.3.1 Power-On Self-Test

• 3.3.3.2 Adult Defaults and Alarm Limit Ranges

• 3.3.3.3 Neonate Defaults and Alarm Limit Ranges

3.3.3.1 Power-On Self-Test

1. Connect the monitor to an AC power source and verify that the BATTERY

2. Do not connect any input cables to the monitor.

3. Observe the monitor front panel. With the monitor off, press the

CHARGING indicator is lit.

ON/STANDBY button. The monitor must perform the following sequence.

a. The monitor emits three consecutively higher pitched beeps.
b. All indicators light for a few seconds as illustrated in Figure 3-1. Verify

that the SpO2% (left-most display), HEART/PULSE RATE (middle),
and RESPIRATION RATE (right) displays all indicate “8.8.8.”.

Figure 3-1: Self-Test Display

c. All displays turn off momentarily.

3-3

Section 3: Performance Verification

d. Digital displays individually light in a scanning test pattern.
e. A 1-second beep sounds and all displays again illuminate momentarily.
f. All displays turn off except the POWER ON and BATTERY

CHARGING indicators. The SpO2% and HEART/PULSE RATE
displays are blank. The RESPIRATION RATE display indicates “0” for
about 15 seconds, then is blank. The monitor is in the “normal mode
steady state.”

g. Press and hold the NEW PATIENT/NEONATAL button (located on the

rear panel) for 3 seconds until you hear three beeps, indicating that
stored patient data is cleared.

3.3.3.2 Adult Power-On Defaults and Alarm Limit Ranges

Note: When observing or changing default limits, a 3-second timeout is in

effect, that is, if no action is taken within 3 seconds, the monitor
automatically returns to the normal mode steady state.

1. Ensure that the monitor is on. Press and release the UPPER ALARM LIMIT

button. Verify that the monitor emits a single beep and the SpO2% display
indicates an alarm limit of “100” for about 3 seconds. Verify that the other
displays indicate a single bar at the top of each window while the “100” is
displayed.

At the end of the 3 seconds, the displays are blank (normal mode steady
state).

2. Press and release the UPPER ALARM LIMIT button. Begin rotating the

control knob counterclockwise (CCW) within 3 seconds. Verify that the
SpO2% display reduces to a minimum of “85.”.

Note: A decimal point in the display indicates that the alarm limits have

changed.

3. Press and release the LOWER ALARM LIMIT button. Verify that the

monitor emits a single beep and the SpO2% display indicates an alarm limit
of “85” for 3 seconds. Verify that the other displays indicate a single bar at
the bottom of each window.

4. Press and hold the LOWER ALARM LIMIT button. Rotate the control knob

CCW and verify that the SpO2% display reduces to a minimum of “20”.
Rotate the control knob clockwise (CW) and verify that the SpO2% display
cannot be raised past the upper alarm limit setting of “85”.

5. Press the UPPER ALARM LIMIT button two times rapidly (twice within 3

seconds). Verify that the monitor emits two beeps and the HEART/PULSE
RATE display indicates an alarm limit of “170” for about 3 seconds.

3-4

Section 3: Performance Verification

6. From the normal mode steady state, press the UPPER ALARM LIMIT

button two times rapidly. Begin rotating the control knob CCW within
3 seconds. Verify that the HEART/PULSE RATE display reduces to a
minimum of “40”.

7. Press the LOWER ALARM LIMIT button two times rapidly. Verify that the

HEART/PULSE RATE display indicates an alarm limit of “40” for 3 seconds.

8. From the normal mode steady state, press the LOWER ALARM LIMIT

button two times rapidly. Rotate the control knob CCW. Verify that the
HEART/PULSE RATE display reduces to a minimum of “30”.

9. Press the LOWER ALARM LIMIT button three times rapidly. Verify that the

RESPIRATION RATE display indicates an alarm limit of “4” for 3 seconds.

10. From the normal mode steady state, press the LOWER ALARM LIMIT

button three times rapidly. Begin rotating the control knob CW within
3 seconds. Verify the RESPIRATION RATE display increases to a
maximum of “40”.

11. Press the UPPER ALARM LIMIT button three times rapidly. Verify the

RESPIRATION RATE display indicates an alarm limit of “40” for 3 seconds.

12. Press the UPPER ALARM LIMIT button three times rapidly. Begin rotating

the control knob CW within 3 seconds. Verify that the RESPIRATION RATE
display increases to a maximum of “150”.

13. Press the ON/STANDBY button to turn the monitor off. Verify that the

monitor emits three decreasing pitch beeps.

14. Press the ON/STANDBY button to turn the N-3000 back on.

15. Press and release the UPPER ALARM LIMIT button. Verify that the SpO2%

display indicates an alarm limit of “100”.

16. Press and release the LOWER ALARM LIMIT button. Verify that the

SpO2% display indicates an alarm limit of “85”.

17. Press the UPPER ALARM LIMIT button two times rapidly. Verify that the

HEART/PULSE RATE display indicates an alarm limit of “170”.

18. Press the LOWER ALARM LIMIT button two times rapidly. Verify that the

HEART/PULSE RATE display indicates an alarm limit of “40”.

19. Press the UPPER ALARM LIMIT button three times rapidly. Verify that the

RESPIRATION RATE display indicates an alarm limit of “40”.

20. Press the LOWER ALARM LIMIT button three times rapidly. Verify that the

RESPIRATION RATE display indicates an alarm limit of “4”.

21. Press the ON/STANDBY button to turn the monitor off.

3-5

Section 3: Performance Verification

3.3.3.3 Neonate Power-On Defaults and Alarm Limit Ranges

Note: When observing or changing default limits, a 3-second timeout is in

effect, that is, if no action is taken within 3 seconds, the monitor
automatically returns to the normal mode steady state.

1. Turn the monitor on.

2. Press the NEW PATIENT/NEONATAL button on the rear panel twice within

2 seconds. Verify that there is an audible beep each time the button is
pressed.

3. Verify that the NEONATAL MODE indicator on the front panel is lit.

4. Press and release the UPPER ALARM LIMIT button. Verify that the SpO2%

display indicates an alarm limit of “95” for 3 seconds. Verify that the other
displays indicate a single bar at the top of each window while the “95” is
displayed.

5. Press and release the UPPER ALARM LIMIT button. Begin rotating the

control knob CCW within 3 seconds. Verify that the SpO2% display reduces
to a minimum of “80”.

6. Press and release the LOWER ALARM LIMIT button. Verify that the SpO2%

display indicates an alarm limit of “80”. Verify that the other displays
indicate a single bar at the bottom of each window.

7. From the normal mode steady state, press and release the LOWER ALARM

LIMIT button. Rotate the control knob CCW. Verify that the SpO2% display
reduces to a minimum of “20”.

8. Press the UPPER ALARM LIMIT button two times rapidly (twice within 3

seconds). Verify that the HEART/PULSE RATE display indicates an alarm
limit of “190”.

9. Press the LOWER ALARM LIMIT button twice rapidly. Verify that the

HEART/PULSE RATE display indicates an alarm limit of “90”.

10. Press the UPPER ALARM LIMIT button three times rapidly. Verify that the

RESPIRATION RATE display indicates an alarm limit of “80”.

11. Press the LOWER ALARM LIMIT button three times rapidly. Verify that the

RESPIRATION RATE display indicates an alarm limit of “20”.

12. Press the ON/STANDBY button to turn the monitor off.

13. Press the ON/STANDBY button to turn the monitor on. The monitor

performs the sequence described in 3.3.3.1. Verify that the “NEO” indicator
is not lit.

14. Press and release the UPPER ALARM LIMIT button. Verify that the SpO2%

display indicates an alarm limit of “100”.

3-6

15. Press and release the LOWER ALARM LIMIT button. Verify that the SpO2%

display indicates an alarm limit of “85”.

16. Press the ON/STANDBY button to turn the monitor off.

This completes the power-up performance tests.

3.3.4 Hardware and Software Tests

Hardware and software testing include the following tests.

• 3.3.4.1 Operation with a Pulse Oximeter Tester

• 3.3.4.2 Operation with an ECG Simulator

• 3.3.4.3 Operation with a Respiration Simulator

• 3.3.4.4 General Operation

3.3.4.1 Operation with a Pulse Oximeter Tester

Operation with an SRC-2 pulse oximeter tester includes the following tests.

• 3.3.4.1.1 Alarms and Alarm Silence

• 3.3.4.1.2 Alarm Volume Control

• 3.3.4.1.3 Pulse Tone Volume Control

• 3.3.4.1.4 Dynamic Operating Range

• 3.3.4.1.5 RCAL Determination

• 3.3.4.1.6 LED Drive Test

3.3.4.1.1 Alarms and Alarm Silence

Section 3: Performance Verification

1. Connect the SRC-2 pulse oximeter tester to the sensor input cable and

connect the cable to the monitor. Set the SRC-2 as follows:

SWITCH POSITION

RATE 38
LIGHT LOW
MODULATION OFF
RCAL/MODE RCAL 63/LOCAL

2. Press the ON/STANDBY button to turn the monitor on. After the normal

power-up sequence, verify that the SpO2%, HEART/PULSE RATE and
RESPIRATION RATE displays initially indicate zeroes.

Note: The pulse bar may occasionally indicate a step change as the

monitor is in the pulse search mode.

3. Move the modulation switch on the SRC-2 to LOW.

4. Verify that the following monitor reaction:

a. The pulse bar begins to track the artificial pulse signal from the SRC-2.
b. The pulse tone is heard.
c. Zeroes are displayed in the SpO2%, HEART/PULSE RATE, and

RESPIRATION RATE displays.

d. After about 10 to 20 seconds, the monitor displays a saturation and

pulse rate as specified by the tester. Verify that the values are within
the following tolerances:

Oxygen Saturation Range 79% to 83%
Pulse Rate Range 37 to 39 bpm

3-7

Section 3: Performance Verification

e. The audible alarm sounds and both the SpO2% and HEART/PULSE

5. Press and momentarily hold the AUDIBLE ALARM OFF button on the top of

the monitor. Verify that the HEART/PULSE RATE display indicates “60” and
the RESPIRATION RATE display indicates “SEC” while the AUDIBLE
ALARM OFF button is pressed. The alarm is silenced.

6. Release the AUDIBLE ALARM OFF button. Verify the following:

a. The alarm remains silenced.
b. The AUDIBLE ALARM OFF indicator lights.
c. The SpO2% and HEART/PULSE RATE displays resume flashing.
d. The pulse tone is still audible.
e. The audible alarm returns in approximately 60 seconds.

7. Press and hold the AUDIBLE ALARM OFF button. Rotate the control knob

CCW until the HEART/PULSE RATE display indicates “30”. Rotate the
control knob CW and verify that the displays indicate 60 SEC, 90 SEC, 120
SEC, and OFF. Release the button when the display indicates “OFF”. Verify
that the AUDIBLE ALARM OFF indicator flashes.

RATE displays will flash, indicating both parameters have violated the
default alarm limits.

8. Wait approximately 3 minutes. Verify that the alarm does not return. After 3

minutes, the alarm silence reminder beeps three times, and will continue to
do so at 3-minute intervals.

3.3.4.1.2 Alarm Volume Control

After completing the procedure in paragraph 3.3.4.1.1:

1. Press and hold the AUDIBLE ALARM OFF button on the top of the monitor.

Verify the following:

a. “OFF” is displayed for approximately 3 seconds.
b. After 3 seconds, a steady tone is heard at the default alarm volume

setting, the HEART/PULSE RATE display indicates “VOL”, and the
RESPIRATION RATE display indicates the default setting of 5.

2. While continuing to hold the AUDIBLE ALARM OFF button, rotate the

control knob CCW to decrease the alarm volume setting to a minimum
value of 1. The alarm tone should decrease but still be audible.

3. Rotate the control knob CW to increase the alarm volume setting to a

maximum value of 10. Verify the volume increases. Rotate the knob CCW
until a comfortable audio level is attained.

4. Release the AUDIBLE ALARM OFF button. The tone will stop.

3-8

3.3.4.1.3 Pulse Tone Volume Control

1. Rotate the control knob CW and verify that the beeping pulse tone sound

level increases.

Section 3: Performance Verification

2. Rotate the control knob CCW and verify that the beeping pulse tone

decreases until it is no longer audible. Rotate the knob CW to return the
beep volume to a comfortable level.

3.3.4.1.4 Dynamic Operating Range

The following test sequence verifies proper monitor operation over a range of
input signals.

1. Connect the SRC-2 to the N-3000 and turn the N-3000 on.

2. Place the SRC-2 in the RCAL 63/LOCAL mode.

3. Set the SRC-2 as indicated in Table 3-1. Verify that the N-3000 readings

are within the indicated tolerances. Allow the monitor several seconds to
stabilize the readings.

Note: A “*” indicates values that produce an alarm. Press the AUDIBLE

ALARM OFF button to silence the alarm.

Table 3-1: Dynamic Operating Range

SRC-2 Settings N-3000 Indications

RATE LIGHT MODULATION SpO2 Pulse Rate

38 HIGH2 LOW 79 - 83* 37 - 39*
112 HIGH1 HIGH 79 - 83* 110 - 114
201 LOW LOW 79 - 83* 195 - 207*
201 LOW HIGH 79 - 83* 195 - 207*

4. Turn the monitor off.

3.3.4.1.5 RCAL Determination

1. Ensure that the N-3000 is turned off and connected to AC power via an

external power supply.

2. Connect the SRC-2 pulse oximeter tester to the sensor input cable and

connect the cable to the monitor. Set the SRC-2 as follows:

SWITCH POSITION

RATE 38
LIGHT LOW
MODULATION OFF
RCAL/MODE RCAL 63/LOCAL

3. Enter the service mode as follows:

a. While simultaneously holding down the UPPER and LOWER ALARM

LIMIT buttons and the PRINT button, press and release the
ON/STANDBY button. Continue to press and hold the UPPER and
LOWER ALARM LIMIT and PRINT buttons while the monitor performs
the power-on test.

b. When “SEr” begins flashing in the AUXILIARY display, release the

UPPER and LOWER ALARM LIMIT and PRINT buttons.

3-9

Section 3: Performance Verification

c. Press the PRINT button within 15 seconds or the monitor will turn off

4. Select menu item 30 by rotating the knob until “30” appears in the SpO2%

display.

5. Press the UPPER ALARM LIMIT button.

6. Verify the RCAL index number “63” is displayed in the HEART/PULSE

RATE display.

7. Set the SRC-2 RCAL/Mode switch to 64/LOCAL and verify that “64” is

displayed in the HEART/PULSE RATE display.

8. Press the ON/STANDBY button to turn the monitor off.

3.3.4.1.6 LED Drive Test

1. Ensure that the N-3000 is turned off and connected to AC power via an

external power supply.

2. Connect the SRC-2 pulse oximeter tester to the sensor input cable and

connect the cable to the monitor. Set the SRC-2 as follows:

automatically. The number “1” appears in the SpO2% display. You are
now in the service mode steady state.

SWITCH POSITION

RATE 38
LIGHT LOW
MODULATION OFF
RCAL/MODE RCAL 63/LOCAL

3. Enter the service mode as follows:

a. While simultaneously holding down the UPPER and LOWER ALARM

LIMIT buttons and the PRINT button, press and release the
ON/STANDBY button. Continue to press and hold the UPPER and
LOWER ALARM LIMIT and PRINT buttons while the monitor performs
the power-on test.

b. When “SEr” begins flashing in the AUXILIARY display, release the

UPPER and LOWER ALARM LIMIT and PRINT buttons.

c. Press the PRINT button within 15 seconds or the monitor will turn off

automatically. The number “1” appears in the SpO2% display. You are
now in the service mode.

4. Select menu item 33 by rotating the knob until “33” appears in the SpO2%

display.

5. Press the UPPER ALARM LIMIT button.

3-10

6. Verify that the SpO2 IR LED drive value “170” is displayed in the

HEART/PULSE RATE display and the IR indicator on the SRC-2 is
illuminated.

7. Rotate the control knob to adjust the IR LED drive level indicated in the

HEART/PULSE RATE display to “255”.

Section 3: Performance Verification

8. While watching the IR indicator on the SRC-2, press the UPPER ALARM

LIMIT button and verify that the LED intensity increases.

9. Rotate the knob to adjust the IR LED drive level to “0”.

10. Press the UPPER ALARM LIMIT button. Verify that the IR LED turns off.

11. Rotate the knob to adjust the IR LED drive level to “170”.

12. Press the UPPER ALARM LIMIT button and verify that the LED intensity

increases.

13. Press the LOWER ALARM LIMIT button to return to the service mode

steady state.

14. Select menu item 34 by rotating the knob until “34” appears in the SpO2%

display.

15. Press the UPPER ALARM LIMIT button.

16. Verify that the SpO2 red LED drive value “170” is displayed in the

HEART/PULSE RATE display and that the IR indicator on the SRC-2 is
illuminated.

17. Rotate the control knob to adjust the red LED drive level to “255”.

18. Press the UPPER ALARM LIMIT button and verify that the LED intensity

increases.

19. Rotate the knob to adjust the red LED drive level to “0”.

20. Press the UPPER ALARM LIMIT button and verify that the RED indicator turns

off.

21. Rotate the knob to adjust the red LED drive level back to “170”.

22. Press the UPPER ALARM LIMIT button and verify that the RED indicator

intensity increases.

23. Press the LOWER ALARM LIMIT button to return to the service mode

steady state.

24. Press the ON/STANDBY button to turn the N-3000 off.

3.3.4.2 Operation with an ECG Simulator

1. With the monitor off, connect the ECG leads RA, LA, and LL to the

appropriate jacks on the ECG tester.

Nellcor Puritan Bennett ECG leads are color-coded as follows:
Right arm (RA) - white

Left arm (LA) - Black
Left leg (LL) - Red

3-11

Section 3: Performance Verification

2. Connect the leads to the SCE-10 ECG cable. Connect the SCE-10 to the

ECG input port on the N-3000. Set the ECG tester as follows:

PARAMETER SETTING

HEART RATE 30 bpm
AMPLITUDE 1 millivolt
LEAD SELECT I
SINUS RHYTHM Normal
RCAL/MODE Adult

Note: The accuracy of N-3000 ECG measurements is + 5 bpm. In the

3. Ensure that the monitor is connected to an AC power source. Press the

ON/STANDBY button to turn the monitor on. After the normal power-up
sequence, verify the following monitor reactions:

a. The heart rate “beep” will be heard.
b. After at least five heartbeats, the monitor displays a heart rate of 30 ± 5

c. The audible alarm will sound and the HEART/PULSE RATE display will

procedure below, add the tolerance of the simulator to the acceptable
range of readings.

bpm.

flash, indicating the heart rate is below the default lower alarm limit.
The heart rate “beep” can still be heard.

4. Press the AUDIBLE ALARM OFF BUTTON. Verify that the alarm is

silenced.

5. Increase the heart rate setting on the ECG simulator to 240 bpm. Verify that

the rate of beeps increases and the HEART/PULSE RATE display value
increases.

6. After at least five heartbeats, verify that the monitor displays a heart rate of

240 ± 5 bpm.

7. Verify that the audible alarm sounds and the HEART/PULSE RATE display

flashes, indicating that the heart rate is above the default upper alarm limit.

8. Press AUDIBLE ALARM OFF button to silence the alarm.

9. Decrease the heart rate setting on the ECG simulator to 120 bpm.

10. After at least five heartbeats, verify that the monitor displays a heart rate of

120 ± 5 bpm.

11. Disconnect the LL lead from the ECG simulator. Verify that the LEADS OFF

indicator lights, three dashes are displayed in the HEART/PULSE RATE
display, and a low priority audible alarm sounds.

3-12

12. Reconnect the LL lead to the ECG simulator. Verify that the LEADS OFF

indicator is no longer lit and that the alarm is silenced.

Note: Depending on the lead used and pleth configuration, the

HEART/PULSE RATE display may revert to a pulse rate as leads
are removed in step 11. If a medium priority alarm results and is
silenced, the low priority alarm from leads off will not break
through.

13. Repeat steps 11 and 12 for the LA and RA leads.

14. Turn the monitor off.

3.3.4.3 Operation with a Respiration Simulator

1. With the monitor off, connect the Nellcor Puritan Bennett ECG leads to the

appropriate jacks on the respiration simulator.

2. Connect the leads to the SCE-10 ECG cable. Connect the SCE-10 to the

ECG input port on the N-3000.

Note: The accuracy of N-3000 ECG measurements is + 3 breaths per

minute. In the procedure below, add the tolerance of the simulator
to the acceptable range of readings.

Section 3: Performance Verification

3. Set the simulator for a respiration rate of 100 breaths per minute.

4. Ensure that the monitor is connected to an AC power source. Press the

5. Press the AUDIBLE ALARM OFF BUTTON. Verify that the alarm is

6. Decrease the respiration rate setting on the respiration simulator to 20

7. After at least 5 breaths, verify that the monitor displays a respiration rate of

8. Power down the monitor and disconnect it from the simulator.

3.3.4.4 General Operation

ON/STANDBY button to turn the monitor on. After the normal power-up
sequence, verify the following monitor reactions:

a. After about 20-25 seconds, the monitor displays a respiration rate of

100 ± 3 breaths per minute.

b. The audible alarm will sound and the RESPIRATION RATE display will

flash, indicating the respiration rate is above the default upper alarm
limit.

silenced.

breaths per minute.

20 ± 3 breaths per minute.

The following tests are an overall performance check of the system:

• 3.3.4.4.1 LED Excitation Test

• 3.3.4.4.2 Operation with a Live Subject

• 3.3.4.4.3 Serial Interface Test

• 3.3.4.4.4 Piezo Speaker Test

• 3.3.4.4.5 Persistent Time Clock Test

3-13

Section 3: Performance Verification

• 3.3.4.4.6 ECG Cable Test

3.3.4.4.1 LED Excitation Test

This procedure uses normal system components to test circuit operation. A
Nellcor Puritan Bennett™ Oxisensor II® oxygen transducer, model D-25, is used
to examine LED intensity control. The red LED is used to verify intensity
modulation caused by the LED intensity control circuit.

1. Connect the monitor to an AC power source through the SPS-N1 or PSS-1

power supply.

2. Connect an SCP-10 sensor input cable to the monitor.

3. Connect a D-25 sensor to the sensor input cable.

4. Press the ON/STANDBY button to turn the monitor on.

5. Leave the sensor open with the LEDs and photodetector visible.

6. After the monitor completes its normal power-up sequence, verify that the

sensor LED is brightly lit.

7. Slowly move the sensor LED in proximity to the photodetector element of

the sensor. Verify, as the LED approaches the optical sensor, that the LED
intensity decreases.

8. Open the sensor and notice that the LED intensity increases.

9. Repeat step 7 and the intensity will again decrease. This variation is an

indication that the microprocessor is in proper control of LED intensity.

10. Turn the N-3000 off.

3.3.4.4.2 Operation with a Live Subject

Patient monitoring involves connecting the monitor to a live subject for a
qualitative test.

1. Ensure that the monitor is connected to an AC power source through the

SPS-N1 or PSS-1 power supply.

2. Connect an SCP-10 sensor input cable to the monitor.

3. Connect a Nellcor Puritan Bennett™ Durasensor® oxygen transducer,

model DS-100A, to the sensor input cable.

4. Clip the DS-100A to the subject as recommended in the sensor directions

for use.

5. Connect ECG electrodes to the patient.

6. Connect an SCE-10 ECG cable to the N-3000. Connect ECG leads to the

cable.

3-14

7. Connect the ECG leads to the electrodes on the patient according to the

leads directions for use.

Section 3: Performance Verification

8. Press the ON/STANDBY button to turn the monitor on and verify that the

monitor is operating.

9. The monitor should stabilize on the subject’s physiological signal in about

15 to 30 seconds. Verify that the saturation and heart and respiration rates
are reasonable for the subject.

3.3.4.4.3 Serial Interface Test

The communications submodule of the N-3000, using an asynchronous EIA-232
communications format, allows communications between the N-3000 and a PC
via the 6-pin connector on the rear panel of the N-3000, as illustrated in Figure
3-2. An SAK-232 cable and detailed directions for use are available by
contacting your local Nellcor Puritan Bennett representative.

Figure 3-2: Serial Port Interface

The two configurable options of serial data interface are RS-232 and EIA-422.
The N-3000 is shipped with the RS-232 setting. To change the settings, refer to
paragraph 6.5.1.

Perform the following procedure to test the serial port voltages. The test is
qualitative and will only verify that the serial interface port is powered correctly.

1. Connect the monitor to an AC power source through the SPS-N1 or PSS-1

power supply and turn the monitor on.

2. Connect a 6-pin miniature connector adapter to the serial interface port.

3. Set up the DMM with the function set to “VDC” at a range of 10 volts.

4. Connect the DMM negative lead to connector pin 4 (GND).

3-15

Section 3: Performance Verification

5. Connect the DMM positive lead to the following pins and verify the voltage

values listed in Table 3-2. If the voltages are not as indicated, follow the
procedures in paragraph 5.6.7.

Figure 3-3: Serial Port Connector - External Pin Locations

Table 3-2: Serial Port Voltages

Pin Line Voltage

1 DTR 7.5 ± 2.5
2 DSR 0.0 ± 0.4
3 TXD -7.5 ± 2.5
4 GND 0.0 ± 0.4
5 RXD 0.0 ± 0.4
6 Alarm Active 0.0 ± 0.4 or

3.3 ± 0.4

3.3.4.4.4 Piezo Speaker Test

The following test verifies that the Piezo power-loss alarm speaker sounds when
the N-3000 loses power.

WARNING: Before attempting to open or disassemble the N-3000,
disconnect the power cord from the N-3000.

Caution: Observe ESD (electrostatic discharge) precautions when working
within the monitor.

3-16

Section 3: Performance Verification

1. Ensure that the N-3000 is turned off.

2. Disconnect the monitor from the external power supply.

3. Set the N-3000 upside down facing you, as shown in Figure 3-4.

Figure 3-4: Battery Cover Removal

4. Using a small, Phillips-head screwdriver, loosen the two battery cover

retaining fasteners securing the battery compartment cover.

5. Gently squeeze the battery cover sides in the middle as you swing the

cover open (it is hinged on the right with three tabs that extend into slots on
the chassis).

3-17

Section 3: Performance Verification

6. Lift the battery out of the compartment, as shown in Figure 3-5. It may be

necessary to use the edge of a flat tip screwdriver to gently pry the battery
loose.

Figure 3-5: Speaker Test

7. Turn the monitor on by pressing the ON/STANDBY button.

8. When the power-on self-test is complete, disconnect the power connector

from the battery. Verify that a shrill, beeping alarm is emitted from the
speaker.

9. Reconnect the power connector to the battery. Verify that the alarm is

silenced and the monitor powers back on.

10. Disconnect the power connector from the battery a second time. Verify that

the Piezo alarm sounds.

11. Press the AUDIBLE ALARM OFF button and verify that the alarm is

silenced.

12. Reconnect the power connector to the battery. Verify that the alarm remains

silent and the monitor powers back on.

13. Turn the monitor off by pressing the ON/STANDBY button.

14. Replace the battery in the battery bracket and reconnect the battery cover.

3-18