Mallinckrodt NELLCOR NPB-195 User manual

Caution: Federal law (U.S.) restricts this device to sale by or on the order of a physician.
To contact Mallinckrodt's representative: In the United States, call 1-800-635-5267 or 314-654-2000; outside the United States,
call your local Mallinckrodt representative.
© 2000 Mallinckrodt Inc. All rights reserved. 035154D-0100
SERVICE MANUAL
NPB-195 Pulse Oximeter

Mallinckrodt Inc.
675 McDonnell Boulevard
P.O. Box 5840
St. Louis, MO 63134 USA
Tel [phone]
Toll Free 1.800.635.5267
Mallinckrodt
Europe BV
Hambakenwetering 1
5231 DD's-Hertogenbosch
The Netherlands
Tel [phone]
Nellcor Puritan Bennett Inc.
4280 Hacienda Drive
Pleasanton, CA 94588 USA
Nellcor Puritan Bennett Inc. is a wholly owned subsidiary of Mallinckrodt Inc. Nellcor,
Nellcor Puritan Bennett, Durasensor, and Oxisensor II are trademarks of Mallinckrodt Inc.
To obtain information about a warranty, if any, for this product, contact Mallinckrodt's
Technical Services or your local Mallinckrodt representative.
Purchase of this instrument confers no express or implied license under any Mallinckrodt
patent to use the instrument with any sensor that is not manufactured or licensed by
Mallinckrodt.
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.

iii
TABLE OF CONTENTS
List of Figures
List of Tables
Table of Contents ........................................................................................ iii
List of Figures........................................................................................... v
List of Tables............................................................................................ vi
Section 1: Introduction .............................................................................. 1-1
1.1 Manual Overview.......................................................................... 1-1
1.2 NPB-195 Pulse Oximeter Description.......................................... 1-1
1.3 Power-On Self Test...................................................................... 1-4
1.4 Related Documents...................................................................... 1-4
Section 2: Routine Maintenance ............................................................... 2-1
2.1 Cleaning ....................................................................................... 2-1
2.2 Periodic Safety and Functional Checks ....................................... 2-1
2.3 Battery.......................................................................................... 2-1
Section 3: Performance Verification......................................................... 3-1
3.1 Introduction .................................................................................. 3-1
3.2 Equipment Needed ...................................................................... 3-1
3.3 Performance Tests....................................................................... 3-1
3.4 Safety Tests ................................................................................. 3-9
Section 4: Power-On Settings and Service Functions ........................... 4-1
4.1 Introduction .................................................................................. 4-1
4.2 Power-On Settings ....................................................................... 4-1
4.3 Service Functions......................................................................... 4-2
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
5.7 Error Codes.................................................................................. 5-7
Section 6: Disassembly Guide .................................................................. 6-1
6.1 Introduction .................................................................................. 6-1
6.2 Prior to Disassembly .................................................................... 6-1
6.3 Fuse Replacement....................................................................... 6-2
6.4 Monitor Disassembly.................................................................... 6-3
6.5 Monitor Reassembly .................................................................... 6-4
6.6 Battery Replacement.................................................................... 6-5
6.7 Power Entry Module (PEM) Removal/Installation ........................ 6-7
6.8 Power Supply Removal/Installation.............................................. 6-8
6.9 Cooling Fan Removal/Installation ................................................ 6-9
6.10 Display PCB Removal/Installation................................................ 6-10
6.11 UIF PCB Removal/Installation...................................................... 6-11
6.12 Alarm Speaker Removal/Installation............................................ 6-13
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 ....................................................... 8-2
8.3 Repacking in a Different Carton................................................... 8-3

Table of Contents
iv
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............................................................... 9-3
9.7 Performance ................................................................................ 9-3
Section 10: Serial Port Interface Protocol................................................ 10-1
10.1 Introduction .................................................................................. 10-1
10.2 Enabling the Serial Port................................................................ 10-1
10.3 Connecting to the Serial Port ....................................................... 10-1
10.4 Real-Time Printout ....................................................................... 10-2
10.5 Trend Data Printout...................................................................... 10-5
10.6 Nurse Call .................................................................................... 10-5
Section 11: Technical Supplement ........................................................... 11-1
11.1 Introduction .................................................................................. 11-1
11.2 Oximetry Overview....................................................................... 11-1
11.3 Circuit Analysis............................................................................. 11-2
11.4 Functional Overview..................................................................... 11-2
11.5 AC Input ....................................................................................... 11-3
11.6 Power Supply PCB Theory of Operation...................................... 11-3
11.7 Battery.......................................................................................... 11-4
11.8 User Interface PCB (UIF) ............................................................. 11-5
11.9 Front Panel Display PCB and Controls ........................................ 11-8
11.10 Schematic Diagrams.................................................................... 11-8
Section 12: Index ........................................................................................ 12-1

Table of Contents
v
LIST OF FIGURES
Figure 1-1: NPB-195 Front Panel .................................................................. 1-2
Figure 1-2: User Softkey Map........................................................................ 1-3
Figure 1-3: NPB-195 Rear Panel................................................................... 1-4
Figure 3-1: NPB-195 Controls ....................................................................... 3-2
Figure 3-2: Self-Test Display......................................................................... 3-3
Figure 3-3: Adjusting %SpO2 Upper Alarm Limit .......................................... 3-3
Figure 3-4: Adjusting % SpO2 Lower Alarm Limit ......................................... 3-4
Figure 3-5: Adjusting High Pulse Rate Alarm ................................................ 3-4
Figure 3-6: Adjusting Low Pulse Rate Alarm................................................. 3-4
Figure 4-1: Service Function Softkeys........................................................... 4-2
Figure 4-2: Service Function Softkey Map .................................................... 4-3
Figure 4-3: Param Softkeys.......................................................................... 4-4
Figure 4-4: Print Softkeys .............................................................................. 4-4
Figure 4-5: Trend Printout ............................................................................. 4-5
Figure 4-6: Errlog Printout ............................................................................. 4-6
Figure 4-7: Instat Printout .............................................................................. 4-6
Figure 4-8: Next Softkeys .............................................................................. 4-7
Figure 4-9: Alarms Softkeys .......................................................................... 4-7
Figure 6-1: Fuse Removal............................................................................. 6-2
Figure 6-2: NPB-195 Corner Screws............................................................. 6-3
Figure 6-3: Separating Case Halves ............................................................. 6-4
Figure 6-4: NPB-195 Battery ......................................................................... 6-5
Figure 6-5: Internal Power Connections ........................................................ 6-6
Figure 6-6: Power Entry Module ................................................................... 6-7
Figure 6-7: Power Supply .............................................................................. 6-8
Figure 6-8: Cooling Fan................................................................................. 6-9
Figure 6-9: Display PCB ................................................................................ 6-10
Figure 6-10: UIF PCB .................................................................................... 6-12
Figure 6-11: Alarm Speaker .......................................................................... 6-13
Figure 7-1: NPB-195 Expanded View............................................................ 7-2
Figure 8-1: Repacking the NPB-195.............................................................. 8-2
Figure 10-1: Serial Port Pin Layout................................................................ 10-2
Figure 10-2: Real-Time Printout ................................................................... 10-2
Figure 10-3: Trend Data Printout.................................................................. 10-5
Figure 11-1: Oxyhemoglobin Dissociation Curve ......................................... 11-2
Figure 11-2: NPB-195 Functional Block Diagram ......................................... 11-3
Figure 11-3: UIF PCB Front End Red/IR Schematic Diagram ..................... 11-8
Figure 11-4: Front End LED Drive Schematic Diagram ............................... 11-8
Figure 11-5: Front End Output Schematic Diagram ..................................... 11-8
Figure 11-6: Front End Power Supply Schematic Diagram.......................... 11-8
Figure 11-7: Isolation Barrier EIA-232 Port Schematic Diagram.................. 11-8
Figure 11-8: CPU Core Schematic Diagram A............................................. 11-9
Figure 11-9: CPU Core Schematic Diagram B............................................. 11-9
Figure 11-10: MC331 CPU Core Schematic Diagram A .............................. 11-9
Figure 11-11: MC331 CPU Core Schematic Diagram B .............................. 11-9
Figure 11-12: Display Driver Schematic Diagram ........................................ 11-9
Figure 11-13: Speaker Driver Schematic Diagram....................................... 11-9
Figure 11-14: Core Power Supply Schematic Diagram................................ 11-9
Figure 11-15: Power On/Off Circuit Schematic Diagram ............................. 11-9
Figure 11-16: UIF PCB Parts Locator Diagram............................................ 11-9
Figure 11-17: Power Supply Schematic Diagram......................................... 11-9
Figure 11-18: Power Supply Parts Locator Diagram .................................... 11-9

Table of Contents
vi
LIST OF TABLES
Table 3-1: Dynamic Operating Range .......................................................... 3-7
Table 3-2: Earth Leakage Current Limits ..................................................... 3-10
Table 3-3: Enclosure Leakage Current Limits .............................................. 3-11
Table 3-4: Patient Leakage Current Limits................................................... 3-11
Table 3-5: Patient Leakage Current Test Configurations -
Mains Voltage on the Applied Part............................................. 3-12
Table 4-1: Factory Default Settings .............................................................. 4-2
Table 5-1: Problem Categories .................................................................... 5-2
Table 5-2: Power Problems .......................................................................... 5-3
Table 5-3: Button Problems.......................................................................... 5-4
Table 5-4: Display/Alarms Problems ............................................................ 5-4
Table 5-5: Operational Performance Problems............................................ 5-5
Table 5-6: Serial Port Problems ................................................................... 5-6
Table 5-7: Error Codes ................................................................................. 5-7
Table 7-1: Parts List ..................................................................................... 7-1
Table 9-1: Default Settings ........................................................................... 9-3
Table 10-1: Serial Port Pin-Outs................................................................... 10-1
Table 10-2: Status Codes............................................................................. 10-4

1-1
SECTION 1: INTRODUCTION
1.1 Manual Overview
1.2 NPB-195 Pulse Oximeter Description
1.3 Power-On Self Test
1.4 Related Documents
1.1 MANUAL OVERVIEW
This manual contains information for servicing the Nellcormodel NPB-195
pulse oximeter. Only qualified service personnel should service this product.
Before servicing the NPB-195, read the operator’s manual carefully for a
thorough understanding of operation.
WARNING: Explosion hazard. Do not use the NPB-195 pulse oximeter in
the presence of flammable anesthetics.
1.2 NPB-195 PULSE OXIMETER DESCRIPTION
The NPB-195 is a portable pulse oximeter intended for use as a continuous
noninvasive monitor of arterial oxygen saturation (SpO2) and pulse rate. It can
be used on adult, pediatric and neonatal patients. Oxygen saturation and pulse
rate are displayed digitally along with a plethysmographic waveform or a ten-
segment blip bar which indicates pulse intensity.
Through the use of the four softkeys, the operator can access trend information,
select an alarm limit to be changed, choose the language to be used, adjust the
internal time clock, and change communications protocol. The NPB-195 can
operate on AC power or on an internal battery. This monitor is intended for use
in hospital, hospital-type facilities, during intra-hospital transport, and in home
environments. The controls and indicators for the NPB-195 are illustrated in
Figure 1-1 through Figure 1-3.
Figure 1-2 illustrates the various functions available, and how to access them,
through the use of the softkeys. A complete explanation of the keys is provided
in the NPB-195 operator’s manual.

Section 1: Introduction
1-2
NPB-195
%SP02
BPM
100
110
LIGHTLIMITS TREND SETUP
1 2 3 45 6 79
101112
14
15 13
8
16
1. SpO2Sensor Port 9. Alarm Silence Button
2. Low Battery Indicator 10. Adjust Up Button
3. Power On/Standby Button 11. Adjust Down Button
4. AC/Battery Charging Indicator 12. Contrast Button
5. Waveform Display 13. Softkeys
6. %SpO2Indicator 14. Menu Bar
7. Pulse Beats Per Minute display 15. Pulse Search Indicator
8. Alarm Silence Indicator 16. Speaker
Figure 1-1: NPB-195 Front Panel

Section 1: Introduction
1-3
Normal
Display Mode
Limits Trend Light
Sel Exit View Clock
Setup
Exit
Next
Exit
Blip
Pleth
Return to
Display Mode
LCD Display Light
ON/OFF
View Zoom Next
Dual SpO2 Pulse Hist
Return to
Display Mode
Trend for
SpO2 and
Pulse
SpO2 trend
only
Pulse trend
only
Histogram for
SpO2 and
Pulse
Selects trend data
from last 24, 12, 8, 4,
2 or 1 hours 30min or
15min
Exit
Clear Print
Yes No
Next
Clears all
trend info
Returns to
prior trend
display
Print out
of screen
Returns to
display
mode
Cycles between
(Clear, Print, Exit,
Next) screen and
(View, Zoom,
Exit, Next)
screen
Exit
Select alarm
limit to be adjusted
High/Low
%SpO2 or Pulse
Comm Lang Exit
Next
Select 2400
9600 or 19200 English
Francais
Deutsch
Italiano
Espanol
Dutch
Portug
Return to
Display
Return to
Display Mode
Exit
Sel
ExitSet
Mode
95
65
BPM
%SPO2
Figure 1-2: User Softkey Map

Section 1: Introduction
1-4
2
4
13
5
NPB-195
0123
IPX1
R
NRTL/C
TM
T 0.50A 250V
2X
NELLCOR PURITAN BENNETT EUROPE BV,
's-HERTOGENBOSCH, THE NETHERLANDS
NELLCOR PURITAN BENNETT, INC.
PLEASANTON, CA 94588, U.S.A.
MADE IN IRELAND
SN
100-120 V 200-240 V
50/60 Hz 20VA
U.S. PATENTS:
4,621,643; 4,653,498;
4,700,708; 4,770,179;
4,869,254; Re. 35,122;
4,928,692; 4,934,372;
5,078,136
CISPR 11
Group 1
Class B
1. Equipotential (ground) Terminal 4. Fuse Receptacle
2. AC Inlet 5. Voltage Selection Switch
3. DB-15 Interface Connector
Figure 1-3: NPB-195 Rear Panel
1.3 POWER-ON SELF TEST
When the NPB-195 is turned on it will perform a POST (Power-On Self Test).
During POST the following sequence should occur:
• All indicator lights illuminate
• All pixels in the LCD display illuminate
• The backlight turns on and the Nellcor Puritan Bennett logo and software
version are displayed
Upon successful completion of POST, the NPB-195 sounds a 1-second tone
indicating that the monitor has passed the test.
If the start-up sequence is not completed as described above, do not use the
monitor.
The software version is often needed when calling Mallinckrodt's Technical
Services Department or your local Mallinckrodt representative for technical
assistance. Record the software version and have it available prior to requesting
technical assistance.
1.4 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 NPB-195 operator’s manual. To understand
the various Nellcor sensors that work with the monitor, refer to the individual
sensor’s directions for use.

2-1
SECTION 2: ROUTINE MAINTENANCE
2.1 Cleaning
2.2 Periodic Safety and Functional Checks
2.3 Battery
2.1 CLEANING
Caution: Do not immerse the NPB-195 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 NPB-195, 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
cables with a damp cloth. For sensors, follow each sensor’s 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 NPB-195 for damage.
2. Inspect safety labels for legibility. If the labels are not legible, contact
Mallinckrodt's Technical Services Department or your Mallinckrodt
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 the NPB-195. Contact
Mallinckrodt's Technical Services Department or your local Mallinckrodt
representative.
5. Inspect the fuses for proper value and rating (F1 & F2 = 0.5 amp slow
blow).
2.3 BATTERY
Mallinckrodt recommends replacing the instrument battery every 2 years. When
the NPB-195 is going to be stored for 3 months or more, remove the battery prior
to storage. To replace or remove the battery, refer to Section 6, Disassembly
Guide.
If the NPB-195 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 in
standby, or 18 hours if in use, to receive a full charge. The battery is being
charged anytime the instrument is plugged into AC.

3-1
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
NPB-195 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 NPB-195 fails to perform as specified in any test, repairs must be made to
correct the problem before the monitor is returned to the user.
3.2 EQUIPMENT NEEDED
Equipment Description
Digital multimeter (DMM) Fluke Model 87 or equivalent
Durasensor®oxygen transducer DS-100A
Oxisensor®II oxygen transducer D-25
Pulse oximeter tester SRC-2
Safety analyzer Must meet current AAMI ES1/1993 &
IEC 601-1/1998 specifications
Sensor extension cable EC-4 or EC-8
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 returning the instrument
to use.
Note: This section is written using Mallinckrodt factory-set defaults. If your
institution has preconfigured custom defaults, those values will be
displayed. Factory defaults can be restored using the configuration
mode procedure described in paragraph 4.2.1 below.

Section 3: Performance Verification
3-2
3.3.1 Battery Charge
Perform the following procedure to fully charge the battery.
1. Connect the monitor to an AC power source.
2. Verify that the monitor is off and that the AC Power/Battery Charging
indicator is lit.
3. Charge the battery for at least 14 hours in standby.
3.3.2 Power-up Performance
The power-up performance tests (3.3.3.1 through 3.3.3.3) verify the following
monitor functions:
• 3.3.2.1 Power-On Self-Test
• 3.3.2.2 Power-On Defaults and Alarm Limit Ranges
NPB-195
%SP02
BPM
100
110
LIGHTLIMITS TREND SETUP
Power On/Standby Alarm silence
Adjust
Up
Adjust
Down
Soft keys Contrast
Figure 3-1: NPB-195 Controls
3.3.2.1 Power-On Self-Test
1. Connect the monitor to an AC power source and verify that the AC
Power/Battery Charging indicator is lit.
2. Do not connect any input cables to the monitor.

Section 3: Performance Verification
3-3
3. Observe the monitor front panel. With the monitor off, press the Power
On/Standby button. See Figure 3-1. The monitor must perform the
following sequence.
a. Within 2 seconds all LEDs are illuminated, then all pixels on the LCD
display are illuminated, after which, the backlight comes on.
b. The indicators remain lighted.
c. The LCD display shows the Nellcor Puritan Bennett logo and the
software version of the NPB-195 (Figure 3-2).
NPB-195
Nellcor
Puritan
Bennett
NPB-195 Version 1.1.0.5
Figure 3-2: Self-Test Display
d. A 1-second beep sounds indicating proper operation of the speaker, and
all indicators turn off except the AC Power/Battery Charging
indicators.
e. The NPB-195 begins normal operation.
3.3.2.2 Power-On Defaults and Alarm Limit Ranges
Note: When observing or changing default limits, a 10-second timeout is in
effect. If no action is taken within 10 seconds, the monitor
automatically returns to the monitoring display.
Note: The descriptions that follow are based on the assumption that Pleth is
the view that has been selected. The steps to changing an alarm limit
are the same if the view being used is Blip.
1. Ensure that the monitor is on. Press and release the Limits softkey. Verify
that the monitor emits a single beep and the plethysmograph waveform is
replaced with a display of the alarm limits. The high alarm limit for %SpO2
will indicate an alarm limit of “100” inside a box (Figure 3-3).
NPB-195
EXITSEL
%SP02
BPM
100
110
ALARM LIMITS
UPPER
LOWER
SPO2 PULSE
85
170
40
100
Figure 3-3: Adjusting %SpO2Upper Alarm Limit
At the end of 10 seconds, with no activity, normal monitoring is resumed.

Section 3: Performance Verification
3-4
2. Press the Limits softkey. Press and hold the Down Arrow button. Verify
that the boxed number for %SpO2upper alarm limit reduces to a minimum
of “85.”
Note: A decimal point in the display indicates that the alarm limits have
been changed from factory default values.
3. Press the SEL softkey. Verify that the monitor emits a single beep and the
box moves to the %SpO2lower alarm limit of “85.” See Figure 3-4.
NPB-195
EXITSEL
%SP02
BPM
100
110
ALARM LIMITS
UPPER
LOWER
SPO2 PULSE
85
170
40
100
Figure 3-4: Adjusting % SpO2Lower Alarm Limit
4. Press and hold the Down Arrow button and verify that the %SpO2lower
alarm limit display reduces to a minimum of “20.” Press and hold the Up
Arrow button and verify that the %SpO2lower alarm limit display cannot be
raised past the upper alarm limit setting of “85.” Press the Exit button.
5. Press the Limits softkey and then press the SEL softkey two times. Verify
that the monitor emits a beep after each keystroke. The Pulse upper alarm
limit should be “170” and should be boxed. See Figure 3-5.
NPB-195
EXITSEL
%SP02
BPM
100
110
ALARM LIMITS
UPPER
LOWER
SPO2 PULSE
85
170
40
100
Figure 3-5: Adjusting High Pulse Rate Alarm
6. Press and hold the Down Arrow button. Verify that the Pulse upper alarm
limit display reduces to a minimum of “40” and is displayed. Press the Exit
button.
7. Press the Limits softkey and then press the SEL softkey three times. Verify
that the Pulse lower alarm limit display indicates an alarm limit of “40” and
is boxed. See Figure 3-6.
NPB-195
EXITSEL
%SP02
BPM
100
110
ALARM LIMITS
UPPER
LOWER
SPO2 PULSE
85
170
40
100
Figure 3-6: Adjusting Low Pulse Rate Alarm

Section 3: Performance Verification
3-5
8. Press and hold the Down Arrow button. Verify that the boxed Pulse lower
alarm limit display reduces to a minimum of “30.”
9. Press and hold the Up Arrow button and verify that the boxed Pulse lower
alarm limit display cannot be adjusted above the Pulse high limit of “40.”
10. Press the Power On/Standby button to turn the monitor off.
11. Press the Power On/Standby button to turn the NPB-195 back on.
12. Press and release the Limits softkey. Verify that the %SpO2upper alarm
limit display is boxed and indicates an alarm limit of “100.”
13. Press the SEL softkey. Verify that the %SpO2lower alarm limit display is
boxed and indicates an alarm limit of “85.”
14. Press the SEL softkey a second time. Verify that the Pulse upper alarm
limit display is boxed and indicates an alarm limit of “170.”
15. Press the SEL softkey a third time. Verify that the Pulse lower alarm limit
display is boxed and indicates an alarm limit of “40.”
16. Press the Power On/Standby button to turn the monitor off.
3.3.3 Hardware and Software Tests
Hardware and software testing include the following tests.
• 3.3.3.1 Operation with a Pulse Oximeter Tester
• 3.3.3.2 General Operation
3.3.3.1 Operation with a Pulse Oximeter Tester
Operation with an SRC-2 pulse oximeter tester includes the following tests.
• 3.3.3.1.1 Alarms and Alarm Silence
• 3.3.3.1.2 Alarm Volume Control
• 3.3.3.1.3 Pulse Tone Volume Control
• 3.3.3.1.4 Dynamic Operating Range
3.3.3.1.1 Alarms and Alarm Silence
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 Power On/Standby button to turn the monitor on. After the normal
power-up sequence, press the following softkeys; Setup, View, and Pleth.
Verify that the %SpO2 and Pulse initially indicate zeroes.

Section 3: Performance Verification
3-6
3. Move the modulation switch on the SRC-2 to LOW.
4. Verify the following monitor reactions:
a. The plethysmograph waveform begins to track the artificial pulse
signal from the SRC-2.
b. The pulse tone is heard.
c. Zeroes are displayed in the %SpO2and Pulse 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
e. The audible alarm sounds and both the %SpO2and Pulse displays will
flash, indicating both parameters have violated the default alarm limits.
5. Press and hold the Alarm Silence button on the front of the monitor for less
than 2 seconds. Verify that the %SpO2display indicates “60” and the Pulse
display indicates “SEC” while the Alarm Silence button is pressed. When
the button is released the alarm is silenced.
6. With the alarm silenced verify the following:
a. The alarm remains silenced.
b. The Audible Silence indicator lights.
c. The %SpO2and Pulse displays continue to flash.
d. The pulse tone is still audible.
e. The audible alarm returns in approximately 60 seconds.
7. Press and hold the Alarm Silence button. Press the Down Arrow button
until the Pulse display indicates “30.” Press the Up Arrow button and verify
that the displays indicate 60 SEC, 90 SEC, 120 SEC, and OFF. Release the
button when the display indicates “OFF. "
8. Press and release the Alarm Silence button. Verify that the Alarm Silence
Indicator flashes.
9. 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 approximately 3-minute intervals.

Section 3: Performance Verification
3-7
3.3.3.1.2 Alarm Volume Control
After completing the procedure in paragraph 3.3.3.1.1 above:
1. Press and hold the Alarm Silence button and verify the following:
a. “OFF” is displayed for approximately 2 seconds.
b. After 2 seconds, a steady tone is heard at the default alarm volume
setting, the %SpO2display indicates “VOL,” and the Pulse display
indicates the default setting of 5.
2. While still pressing the Alarm Silence button, press the Down Arrow button
until an alarm volume setting of 1 is displayed. Verify that the volume of
the alarm has decreased but is still audible.
3. Continue pressing the Alarm Silence button and press the Up Arrow button
to increase the alarm volume setting to a maximum value of 10. Verify that
the volume increases. Press the Down Arrow button until a comfortable
audio level is attained.
4. Release the Alarm Silence button. The tone will stop.
3.3.3.1.3 Pulse Tone Volume Control
1. Press the Up Arrow button and verify that the beeping pulse tone sound
level increases.
2. Press the Down Arrow button and verify that the beeping pulse tone
decreases until it is no longer audible. Press the Up Arrow button to return
the beep volume to a comfortable level.
3.3.3.1.4 Dynamic Operating Range
The following test sequence verifies proper monitor operation over a range of
input signals.
1. Connect the SRC-2 to the NPB-195 and turn the NPB-195 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 NPB-195 readings
are within the indicated tolerances. Allow the monitor several seconds to
stabilize the readings.
Note: A asterisk “*” indicates values that produce an alarm. Press the Alarm
Silence button to silence the alarm.
Table 3-1: Dynamic Operating Range
SRC-2 Settings NPB-195 Indications
RATE LIGHT MODULATION SpO2Pulse Rate
38 HIGH2 LOW 79 - 83* 35 - 41*
112 HIGH1 HIGH 79 - 83* 109 - 115
201 LOW LOW 79 - 83* 198 - 204*
201 LOW HIGH 79 - 83* 198 - 204*

Section 3: Performance Verification
3-8
3.3.3.1.5 Nurse Call
Note: The Nurse Call tests must be performed with the instrument operating
on AC power.
1. Connect the negative lead of a voltmeter to pin 10 and positive lead to pin
11 of the serial port on the back of the instrument (Figure 10-1). Ensure
that the audible alarm is not silenced or turned off.
2. Set the SRC-2 to create an alarm condition. Verify an output voltage at pins
10 and 11 between +5 to +12 VDC.
3. Press the Alarm Silence button. With no active audible alarm, the output
voltage at pins 10 and 11 must be between -5 to -12 VDC.
4. Turn the instrument off.
3.3.3.1.6 Operation on Battery Power
1. Turn the instrument on using AC Power.
2. Disconnect the instrument from AC and verify that the AC Power Indicator
turns off.
3. Verify that the instrument continues monitoring normally and that the Low
Battery Indicator is not lit.
Note: If the Low Battery Indicator is illuminated, perform the procedure
outlined in step 3.3.1.
4. Connect the instrument to AC and verify that the AC Power Indicator turns
on and that the instrument is monitoring normally.
3.3.3.2 General Operation
The following tests are an overall performance check of the system:
• 3.3.3.2.1 LED Excitation Test
• 3.3.3.2.2 Operation with a Live Subject
3.3.3.2.1 LED Excitation Test
This procedure uses normal system components to test circuit operation. A
Nellcor 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.
2. Connect an EC-4 or EC-8 sensor input cable to the monitor.
3. Connect a D-25 sensor to the sensor input cable.
4. Press the Power 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.