Nellcor SRC-2 Technical manual
TECHNICAL MANUAL
Pulse Oximeter Tester
Model SRC-2
To contact Mallinckrodt’s representative: In the United States,
call 1-800-635-5267 or (314)-654-2000; outside of the United States,
call your local Mallinckrodt representative.
© 2000 Mallinckrodt Inc. All rights reserved. 060288A-1000
Mallinckrodt Inc.
675 McDonnell Boulevard
P.O. Box 5980
St. Louis, MO 63134 USA
Telephone 314.654.2000
Toll Free 1.800.635.5267
Mallinckrodt
Europe BV
Hambakenwetering 1
5231 DD’s-Hertogenbosch
The Netherlands
Tel +31.73.6485200
Nellcor Puritan Bennett
4280 Hacienda Drive
Pleasanton, CA 94588 USA
Nellcor Puritan Bennett is a wholly owned subsidiary of Mallinckrodt Inc.
Nellcor is a trademark of Mallinckrodt Inc. C-Lock is a trademark of Mallinckrodt Inc.
To obtain information about a warranty, if any, for this product, contact Mallinckrodt
Technical Services or your local Mallinckrodt representative.
Covered by one or more of the following U.S. Patents and foreign equivalents: 4,621,643;
4,700,708; 4,770,179.
CONTENTS
Figures
Tables
Introduction ............................................................................. 1
Electromagnetic Interference ............................................. 1
Unpacking and Inspection .................................................. 2
Manual Introduction ............................................................ 2
Tester Description .............................................................. 3
Guide to Operation.................................................................. 5
Front Panel ......................................................................... 5
Switches and Indicators ..................................................... 6
Basic Operation with Oximeter........................................... 7
Test 1 ........................................................................... 7
Test 2 ........................................................................... 7
Test 3 ........................................................................... 8
Test 4 ........................................................................... 8
Test 5 ........................................................................... 8
Test 6 ........................................................................... 10
Circuit Analysis ....................................................................... 11
Introduction......................................................................... 11
Input Rectifier and Power Circuit........................................ 12
Light Amplitude and Modulation Circuits ............................ 12
Oscillator and Pulse Generator .......................................... 13
ECG Trigger Output (not used by N-20 series) .................. 14
Calibration Resistor ............................................................ 14
Routine Maintenance .............................................................. 15
Service................................................................................ 15
Cleaning Instructions .......................................................... 15
Technical Assistance .......................................................... 15
Returning the SRC-2 .......................................................... 16
Environmental Statement ................................................... 16
iii
Contents
Troubleshooting...................................................................... 17
Disassembly Guide ................................................................. 19
Testing and Verification ......................................................... 23
Spare Parts .............................................................................. 35
Specifications .......................................................................... 37
Schematic Diagram ................................................................. 41
Introduction......................................................................... 17
Introduction......................................................................... 19
Disassembly Procedure...................................................... 19
Assembly Procedure .......................................................... 21
Introduction......................................................................... 23
Test Equipment Required................................................... 23
Connector Continuity Test .................................................. 24
Calibration Resistor Test .................................................... 26
Power Distribution Tests .................................................... 27
Oscillator Circuit Tests ....................................................... 28
Gain/Modulation Verification .............................................. 29
ECG Trigger Output Tests.................................................. 33
Overview............................................................................. 35
Controls .............................................................................. 37
Input/Output Connectors .................................................... 38
Calibration Resistors .......................................................... 38
Accuracy............................................................................. 38
Signal Output...................................................................... 38
Emissions Compliance ....................................................... 39
Environmental..................................................................... 39
Mechanical ......................................................................... 39
Overview............................................................................. 41
iv
FIGURES
1 Front Panel........................................................................ 5
2 Overall Block Diagram ...................................................... 11
3 SRC-2 Exploded View....................................................... 20
4 Ten-Position Header Connector (P2)................................ 24
5 Nine-Position Oximeter D-Connector................................ 24
6 Main PCB Component Location........................................ 41
S-1 Schematic, PCB ................................................................ 43
TABLES
1 Connector Pins.................................................................. 25
Contents
v
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INTRODUCTION
Electromagnetic Interference
Unpacking and Inspection
Manual Introduction
Tester Description
ELECTROMAGNETIC INTERFERENCE
This device has been tested and found to comply with the limits of
the Electromagnetic Compatibility Directive 89/336/EEC. These
limits are designed to provide reasonable protection against
harmful interference in a typical installation. However, because of
the proliferation of radio-frequency transmitting equipment and
other sources of electrical noise in the health-care and home
environments (for example, cellular phones, mobile two-way
radios, electrical appliances), it is possible that high levels of such
interference due to close proximity or strength of a source, may
result in disruption of performance of this device.
This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the
instructions, may cause harmful interference with other devices in
the vicinity. Disruption or interference may be evidenced by
erratic readings, cessation of operation, or other incorrect
functioning. If this occurs, the site use should be surveyed to
determine the source of this disruption, and actions taken to
eliminate the source.
The user is encouraged to try to correct the interference by one or
more of the following measures:
Turn equipment in the vicinity off and on to isolate the offending
equipment.
Reorient or relocate the other receiving device.
Increase the separation between the interfering equipment and
this equipment.
If assistance is required, contact Mallinckrodt’s Technical
Services Department or your local Mallinckrodt representative.
1
Introduction
UNPACKING AND INSPECTION
Upon receipt, inspect the shipping container, if it is damaged,
immediately notify the carrier. The shipping container holds one
SRC-2, one ECG patch cord cable Type L, and one service
manual. Inspect each item, if the SRC-2, the patch cord cable, or
the service manual is missing or damaged, immediately contact
Mallinckrodt’s Technical Services Department or Mallinckrodt’s
local representative.
MANUAL INTRODUCTION
WARNING: Carefully read the operating instructions and all
precautionary information (set in boldface type) before use.
This manual provides service information for the Nellcor pulse
oximeter tester, model SRC-2. The SRC-2 is not intended for use
with Nellcor pulse oximeter models N-10, N-30, or the 4-button
N-100.
Note: This information is intended only for use by qualified
service personnel.
The first three sections describe the SRC-2, give instructions for
using it to test pulse oximeters, and provide a circuit description.
The remaining sections describe troubleshooting, disassembly,
test and calibration verification procedures, and provide a
schematic diagram and a spare parts lists.
2
TESTER DESCRIPTION
The SRC-2 tests the light emitting diode (LED) drive circuits and
internal detect circuits of Nellcor pulse oximeters. The SRC-2 is
powered by the oximeter LED drive signals. Switches allow the
selection of RATE, LIGHT, and MODULATION levels, mode of
operation and RCAL. (RCAL is a parameter used to select the
calibration curve.) LEDs provide an indication that drive signals
from the oximeter are active.
Introduction
Note: This device is designed to verify the calculated SpO
2
value at 81% ±2, and not any other values.
Note: Due to the pulse wave shape generated by the SRC-2
tester and Nellcor’s oximetry sampling technique, the
pulse rate tolerance at high pulse rates slightly exceeds the
oximeter’s pulse rate accuracy specification. The
oximeter’s pulse rate specification is based on the clinical
performance with physiological pulses rather than the
square wave pulses generated by the SRC-2 tester.
Note: The SRC-2 is intended to be used to assist verification of
the operation of Nellcor oximeters and is not to be used to
verify calibration of these oximeters. Refer to the
oximeter’s service manual for calibration instructions, if
applicable.
3
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GUIDE TO OPERATION
Front Panel
Switches and Indicators
Basic Operation with Oximeter
FRONT PANEL
2
1
IR
RED
112
20138
RATE
HIGH 1
LOW
HIGH 2
LIGHT
LOW
HIGHOFF
MODULATION
RCAL/MODE
RCAL 63RCAL 64
LOCALREMOTE
C-LOCK TEST
!
MODELS N-10, N-30, OR 4-BUTTON N-100
MODEL SRC-2
NOT FOR USE WITH NELLCOR
Figure 1: Front Panel
1. IR LED drive input indicator.
2. Standard oximeter connector.
3. RED LED drive input indicator.
4. Pulse RATE selector switch (38, 112, 201)
5. LIGHT output switch (low, high 1, high 2)
6. MODULATION selector switch (off/low/high)
7. RCAL/MODE selector switch
3
4
5
6
7
8
8. C-Lock® TEST input connector
5
Guide to Operation
SWITCHES AND INDICATORS
The SRC-2 front panel has four switches and two LED indicators.
• The IR LED drive indicator (1) and the RED LED drive
indicator (3) illuminate when the OXIMETER is switched
ON and the SRC-2 is connected to it. The LEDs indicate that
the oximeter LED drive circuit signals are functional.
• The RATE switch (4) sets internally generated pulse rates: 38
beats/minute (bpm), 112 bpm, and 201 bpm.
• The LIGHT switch (5) has three positions (low, high 1, and
high 2). Low simulates a condition of dark-colored skin or
thick tissue between the sensor LEDs and the photo detector.
The two high settings simulate conditions of light-colored
skin or thin tissue between the sensor LEDs and the photo
detector.
• The MODULATION switch (6) has three positions (off, low,
and high) and controls amplitude of modulation. The high
setting is equivalent to strong pulse signals detected by an
oxygen transducer, and low setting is equivalent to weak
pulse signals.
• The RCAL/MODE switch (7) selects SRC-2 controlled pulse
rates, light level, and modulation when set to LOCAL, while
also testing the RCAL 63 resistor. When set to REMOTE,
local functions are disabled. When set to RCAL 64, this
resistor is selected.
Note: REMOTE mode is reserved for future use. Do not
use this mode with test procedures in this manual.
6
BASIC OPERATION WITH OXIMETER
1. Turn the oximeter off.
2. Connect the SRC-2 to the sensor connector.
3. Turn the oximeter on.
Ensure that the SRC-2 IR and RED LED drive indicators are
both lit.
4. Set the RCAL/MODE switch to RCAL 63/Local.
5. Set the LIGHT and MODULATION switches as required by
test procedures 1–4 listed on the following page. Allow the
oximeter a few seconds to obtain a steady reading.
6. Observe and record the OXIMETER SpO
saturation and pulse rate. These readings should be within the
specifications defined in each of the tests listed below.
Test 1
1. Set the LIGHT switch to HIGH 1.
Guide to Operation
readings for
2
Test 2
2. Set the MODULATION switch to HIGH.
3. Set the RATE switch to 112.
4. Verify the following readings on the oximeter:
Saturation (%): 81 ±2
Rate (bpm): 112 ±2% (110 to 114)
1. Set the LIGHT switch to LOW.
2. Set the MODULATION switch to LOW.
3. Set the RATE switch to 201.
4. Verify the following readings on the oximeter:
Saturation (%): 81 ±2
Rate (bpm): 201 ±3% (195 to 207)
7
Guide to Operation
Test 3
1. Set the LIGHT switch to HIGH 2.
Note: For the N-100C oximeter, use the high 1 setting.
2. Set the MODULATION switch to LOW.
3. Set the RATE switch to 38.
4. Verify the following readings on the oximeter:
Saturation (%): 81 ±2
Rate (bpm): 38 ±2% (37 to 39)
Test 4
1. Set the LIGHT switch to LOW.
2. Set the MODULATION switch to HIGH.
3. Set the rate switch to 201.
4. Verify the following readings on the oximeter:
Test 5
8
Saturation (%): 81 ±2
Rate (bpm): 201 ±3% (195 to 207)
1. Set the modulation switch to OFF.
2. Set the RCAL switch to RCAL 63.
3. On the oximeter, locate the applicable memory location:
Guide to Operation
Oximeter
N-20 Series
N-100C
N-200
N-180/N-185
N-1000/
N-2500
N-6000/
N-6000B
Memory
Location
9
9
3
9
Service
Screen
SpO2
board
Procedure for finding correct
memory location.
Note: The RCAL value cannot be displayed on
N-20 series oximeters.
1. On the oximeter, press the high sat and audio
alarm off buttons simultaneously.
2. Rotate the control knob until “9” (“3” for the
N-180/N-185) appears in the SAT display field.
3. Note the RCAL value displayed in the Rate
display field.
1. From the main menu, press SETUP.
2. Press OFFLINE MENU.
3. Move the curser to ENGINEERING MENU,
then press EXECUTE.
4. Move the cursor to EXAMINE SAT MEMORY,
then press EXECUTE.
5. Rotate the control knob clockwise to reach item
#9.
6. Note the displayed RCAL value.
1. On the monitor, press the FREEZE button.
2. Press unlabeled menu soft keys 2 and 4
simultaneously.
3. Press “Service” soft key.
4. Press “SpO2” soft key.
5. Note displayed “CALIB. INDEX” RCAL value.
N-3000 Service
Menu,
item #30
1. While simultaneously holding down the upper
and lower limit buttons and the print button,
turn the oximeter on.
2. After the tone, release the three buttons.
3. Press the print button again to confirm that you
are in the service mode.
4. Rotate the control knob to reach item #30.
5. Press the upper limit key.
6. Note displayed RCAL value.
9
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