S5 Cardiac Output and SvO2 Module Technical Reference Manual Slot June 2001

Table of contents

TABLE OF CONTENTS Cardiac Output Modules, M-COP and M-COPSv TABLE OF CONTENTS

i

TABLE OF FIGURES

ii

Introduction

1

1

2

Specifications

1.1 General specifications ...2 1.2 Typical performance ...2 1.2.1 C.O. ...2 1.2.2 SvO2 ...2 1.2.3 InvBP...2 1.3 Technical specifications...3

2

Functional Description

4

2.1 Measurement principle ...4 2.1.1 Cardiac output and REF ...4 2.1.2 SvO2 measurement ...5 2.1.3 Invasive blood pressure measurement ...6 2.2 Main components...6 2.2.1 COP board ...7 2.2.2 COPSv board...10 2.3 Connectors and signals...11 2.3.1 Module bus connector ...11 2.3.2 Front panel connectors ...12

3

Service Procedures

14

3.1 General service information...14 3.2 Service check ...15 3.2.1 Recommended tools ...15 3.3 Disassembly and reassembly...20 3.4 Adjustments and calibrations...20 3.4.1 Cardiac output calibration...20 3.4.2 Invasive pressure calibration...20

4

Troubleshooting

22

4.1 Troubleshooting charts...22 4.1.1 Cardiac Output...22 4.1.2 SvO2 ...22 4.1.3 InvBP...23 4.2 Troubleshooting flowchart ...24

5

Service Menu

25

5.1 COP Menu ...26 5.1.1 COP calibration menu...28

6

Spare Parts

29

6.1 Spare parts list ...29 i Document No. 800 1012-1

Datex-Ohmeda S/5 monitors 6.1.1 Cardiac Output Module, M-COP Rev. 00...29 6.1.2 Cardiac Output Module, M-COP Rev. 01...29 6.1.3 Cardiac Output Module, M-COP Rev. 02...30 6.1.4 Cardiac Output Module, M-COP Rev. 03...30 6.1.5 Cardiac Output and SvO2 Module, M-COPSv Rev. 00 ...30 6.1.6 Cardiac Output and SvO2 Module, M-COPSv Rev. 01 ...31 6.1.7 Front panel stickers for AS/3 modules (square buttons) ...31 6.1.8 Front panel stickers for S/5 modules (round buttons)...31

7

Earlier Revisions

32

APPENDIX A

33

Service check form

A-1

TABLE OF FIGURES Figure 1

Cardiac Output Module, M-COP, and Cardiac Output and SvO2 Module, M-COPSv ... 1

Figure 2

Cardiac output measurement curve... 5

Figure 3

Front panels of Cardiac Output Modules, M-COP and M-COPSv... 6

Figure 4

COPSv board block diagram, on COP board the SvO2 section is excluded... 8

Figure 5

Pressure transducer principle of operation... 8

Figure 6

Serial communication and opto isolation... 9

Figure 7

Cardiac Output Module troubleshooting flowchart...24

Figure 8

Module box and Cardiac Output Module, M-COP ...29

Figure 9

Cardiac Output and SvO2 Module, M-COPSv...30

ii Document No. 800 1012-1

Cardiac Output Modules, M-COP and M-COPSv

INTRODUCTION This section provides information for the maintenance and service of Cardiac Output Modules, MCOP and M-COPSv. Cardiac Output Modules, M-COP and M-COPSv are single width plug-in modules designed for use with the S/5 monitors. Later in this manual modules can be called w/o system name S/5. Both modules provide •

Cardiac output (C.O.)

•

Right ventricular ejection fraction (REF)

•

Invasive blood pressure (InvBP) measurement

Additionally, the COPSv module provides venous oxygen saturation (SvO2) measurement. NOTE: Do not use identical modules in the same monitor simultaneously.These modules are considered as identical and would cause communication errors if used in the same system.

Figure 1

Cardiac Output Module, M-COP, and Cardiac Output and SvO2 Module, MCOPSv

1 Document No. 8001012-1

Datex-Ohmeda S/5 monitors

1

SPECIFICATIONS

1.1 General specifications Module size (W × D × H) Module weight

37 × 180 × 112 mm / 1.5 × 7.1 × 4.4 in 0.35 kg / 0.8 lbs

Power consumption, M-COP Power consumption, M-COPSv

Approximately 3.5 W Approximately 5 W

1.2 Typical performance 1.2.1 C.O. Measurement range Display resolution Repeatability

0.1...20 l/min 0.01 l/min ±2 % or ±0.02 l/min whichever is greater (measured from electrically generated flow curves)

Max. change in blood temp

2.99 °C

Injectate temp range (with Edward's compatible probes) 0...25.5 °C ±0.3 °C 25.5...27.0 °C ±0.5 °C Blood temp range (with Edward's compatible catheters) 17.5...30.9 °C ±0.5°C 31.0...43.0 °C ±0.3°C Protection against electric shock

type CF defibrillation proof

REF Repeatability (Measuring range 10-60 %)

±2 %

1.2.2 SvO2 Accuracy ±2 % (Measuring range 30-95 %) Equal to standard deviation when using in-vivo calibration.

1.2.3 InvBP Measurement range Zero adjustment range Calibration range

2 Document No. 800 1012-1

-40...+320 mmHg ±150 mmHg ±20 %

Cardiac Output Modules, M-COP and M-COPSv Scales

Upper limit is adjustable between 10 and 300 mmHg in steps of 10. Lower limit is 10 % of selected upper limit below zero.

Sweep speed

12.5, 25, 50 mm/s

DIGITAL DISPLAY Range Resolution

-40...+320 mmHg ±1 mmHg

WAVEFORM DISPLAY Range

-30...+300 mmHg

PULSE RATE Measurement range Resolution Accuracy Respiration artifact rejection

30...250 bpm 1 bpm ±5 % or ±5 bpm whichever is greater

1.3 Technical specifications The digital display is averaged over 5 seconds and updated at 5 second intervals. Accuracy

±5 % or ±2 mmHg, whichever is greater

Transducer and input sensitivity

5 µV/V/mmHg, 5 VDC 20 mA max current

Nonlinearity

<1 %, 0 to 200 mmHg <2 %, -40 to 0 and 200 to 320 mmHg

Filter adjustable upper limit

0...22 Hz (-3 dB), 4...22 Hz

Zero set accuracy Calibration resolution Zero time

±1 mmHg ±1 mmHg < 15 sec

Protection against electric shock

type CF defibrillation proof

NOTE: The accuracy of the measurement may be different from the specified accuracy, depending on the transducer/probe used. Please check the transducer/probe specification.

3 Document No. 8001012-1

Datex-Ohmeda S/5 monitors

2

FUNCTIONAL DESCRIPTION

2.1 Measurement principle 2.1.1 Cardiac output and REF Cardiac output measurement is made using the principle of thermodilution. During measurement the catheter lies in the heart, with an injection port in the right atrium (RA) and a thermistor, which is to monitor blood temperature, in the pulmonary artery (PA). A small, known amount of thermal indicator is injected into the RA and is mixed with the blood on its way to the PA. The catheter thermistor measures the decrease in blood temperature as the blood flows past the thermistor in the PA. The information is stored in the module and the cardiac output is calculated from the area beneath the time-temperature Cardiac Output Measurement Curve, as shown in figure 2. The area under the time-temperature curve is inversely proportional to the flow rate which corresponds to cardiac output. The cardiac output is calculated from the equation: C.O.= (1.08 CT 60 Vi(TB-Ti))/(TBdt + C) where: C.O. = 1.08 = CT = 60 = Vi = TB = Ti = TBdt = C=

4 Document No. 800 1012-1

cardiac output in liters/minute factor comparing the density and specific heat of 5% dextrose solution in water to those of blood. correction factor for the injectate temperature rise as it passes through the catheter and its dead space seconds/minute injectate volume in liters baseline blood temperature (°C) injectate temperature area under time-temperature curve between time o and x, where x is the time when the curve has dropped to 30% of its peak value. area beneath time-temperature curve between x and the end of the curve.

Temperature change in blood [%

Cardiac Output Modules, M-COP and M-COPSv

-T

area A

100%

start of meas.

80%

end of meas. area C

30% 0% m.s.

Figure 2

80%

30%

Time

t

Cardiac output measurement curve

A = area derived by integration of the time-temperature curve C = area beneath the time-temperature curve between t30% and end of the curve. Computation based on an exponential fit to the curve between t80% of the peak and t30%. REF (right ventricular ejection fraction) measurement is a part of the time-temperature (thermodilution) cardiac output measurement. Ejection fraction is determined using an exponential technique by synchronizing sensed R-waves with points of temperature changes on the timetemperature curve. Once ejection fraction, cardiac output, and heart rate are known, right ventricular volumes may be calculated. The measurement requires a Baxter-Edwards fast response thermistor catheter and an ECG module to synchronize R-wave detection to the time-temperature curves.

2.1.2 SvO2 measurement The COPSv module measures SvO2 when coupled with a Baxter-Edwards OM-2E optical module and a Swan-Ganz oximetry catheter. To measure SvO2, the system utilizes a spectrophotometric technique involving the use of light emitting diodes (LEDs) that produce red (660 nm) and infrared (810 nm) light. The light is transmitted to the blood through a single plastic optical fiber in the oximetry catheter and reflected back through a separate optical fiber to a photodetector in the optical module. The light is electrically transmitted to the COPSv module and analyzed to determine SvO2. The oximetry portion of the system measures SvO2 in the pulmonary artery by detecting color changes in the red blood cells. When pulses of red and infrared light are transmitted through the oximetry catheter, the light is reflected from the red blood cells and transmitted back through the catheter to the optical module. The amount of light reflected at each wavelength depends primarily on the color of the blood and the number of red blood cells. Since the number of red blood cells in the blood affects the amount of reflected light, the differences are compensated for when the patient’s total hemoglobin value is entered. The optical module stores and transfers SvO2 calibration data. SvO2 values can be affected by the presence of methemeglobin or carboxyhemoglobin which imitate the absorption characteristics of HbO2. Large concentrations of methemeglobin or carboxyhemoglobin could then cause a falsely elevated SvO2. In cases where dysfunctional hemoglobins are suspected, SvO2 should be interpreted with caution. 5 Document No. 8001012-1

Datex-Ohmeda S/5 monitors

2.1.3 Invasive blood pressure measurement To measure invasive blood pressure, a catheter is inserted into an artery or vein. The invasive pressure setup, consisting of connecting tubing, pressure transducer, an intravenous bag of normal saline all connected together by stopcocks, is attached to the catheter. The pressure transducer is placed at the same level with the heart, and electrically zeroed. The pressure transducer is a piezo-resistive device that converts the pressure signal to a voltage. The monitor interprets the voltage signal so that blood pressure data and blood pressure waveforms can be displayed.

2.2 Main components The Cardiac Output Module, M-COP consist of a COP circuit board and two input boards - a CO input board and a P input board, attached to the front panel. The Cardiac Output and SvO2 Module, M-COPSv, consist of a COPSv circuit board and three input boards - a CO input board, a SvO2 input board and a P input board, attached to the front panel. The front panels are shown in figure 3. M-COP 1

M-COPSv

2

P4

P4

3 SvO2

4

6 C.O.

C.O.

5

Figure 3

Front panels of Cardiac Output Modules, M-COP and M-COPSv

(1)

Key for pressure zeroing (Zero P4)

(2)

Key for cardiac output measurement (Start C.O.)

(3)

Connector for invasive blood pressure measurement

(4)

Connector for C.O. self test

(5)

Connector for C.O. measurement

(6)

Connector for SvO2 measurement

6 Document No. 800 1012-1

Cardiac Output Modules, M-COP and M-COPSv

2.2.1 COP board The COP board consists of the following functional sections. • • • • • • •

Processor Cardiac output measurement Cardiac output self test Invasive blood pressure measurement Serial communication Isolation Power supply

Processor section The microprocessor uses the Intel 80C196KC-16 CPU which includes three A/D converters and a UART. The microprocessor uses external memories, an 8-bit data bus, a 16 MHz oscillator, and a watchdog timer. The three A/D-converters within the CPU convert the analog input signals to digital. The internal UART communicates and transfers data between the module and the CPU board in the monitor.

Cardiac output measurement section The catheter and the probe contain an NTC resistor that reacts to temperature change. The temperature dependent voltage across the NTC resistor is amplified and an offset value is added to it. The resultant signal is then regulated into a ±5 V range by voltage slicing and sent to an A/D converter. Because the temperature measurements are calibrated digitally and non-linearity of catheter/probe is compensated by software, ambient temperature change after calibration is the only factor that may influence the measurement.

Cardiac output self test The Cardiac Output Module, M-COP contains a C.O. Self Test connector. When the cable is connected to the C.O. Self Test connector, the microprocessor starts the test program automatically. First, the microprocessor measures 30 °C, then it activates test circuits and measures 37 °C and 41 °C. If the values are not correct ‘Cable fault’ is displayed and there is a fault is either in the module or in the catheter connecting cable.

7 Document No. 8001012-1

Datex-Ohmeda S/5 monitors

Module data

RS485 DRIVER FOR MODULE RESET

RS485 DRIVER FOR DATA

OPTO ISOLATION

POWER NONISOLATION SECTION

PATIENT ISOLATION

ISOLATION TRANS-

Module bus data

MEMORY

FORMER MICROPROCESSOR RAM internal 256 external 16K EPROM 48K RS COMMUNICATION

Serial device communication

SvO2 AD OM-2 control

Power for module

POWER RESET

Reset NONVOLATILE

Power for communication

Module reset

ISOLATION SECTION

ADCONVERTER 8 chn 12 bit

C.O. control

SvO2 MEASURING UNIT

POWER

C.O.

Press AD

AD C.O. MEASURING UNIT

P4 INV PRESSURE MEASURING UNIT

FRONT PANEL KEYS

To optical module

Figure 4

COPSv board block diagram, on COP board the SvO2 section is excluded

Invasive blood pressure measurement section Uin

Pressure transducer Instrumentation amplifier Uout

Input Filter

G to AD converter

Figure 5

Pressure transducer principle of operation

An isolated +5 V supply is connected to the input of the pressure transducer bridge circuit. From the bridge circuit output a differential voltage, which depends on blood pressure and input supply voltage, is calculated using the following formula: 8 Document No. 800 1012-1

Cardiac Output Modules, M-COP and M-COPSv Uout = Uin x Pressure x 5 V, where Uin = 5 V Þ Uout = 25 V x Pressure [mmHg] Pressure amplification is performed by the instrumentation amplifier. The gain of the amplifier is set so that the level of the signal transferred to the A/D converter stays within the measurement range even when there are circumstantial offsets or offsets caused by the pressure transducer. The input filter before the amplifier attenuates high frequency disturbances. A FET switch cuts the measurement current and detects the existence of the pressure transducer. The existence of the pressure transducer is also checked digitally by a jumper next to the connector.

Serial communication Serial communication between the Cardiac Output Module and the Central Unit Frame is via an RS485 type bus. The communication bus drivers are powered from the Module Bus. The module isolation section is powered (+5 V) from the isolated power supply. The communication drivers are controlled by a Reset signal such that when the Reset is active the drivers do not transfer data.

Send data

Receive data Send data send/receive Reset

Figure 6

RS485 Driver NData

Opto isolation

send/receive

Reset

RS485 Driver

Reset in NReset in

to central unit (module bus)

Data

Receive data

Patient Isolation

to module prosessor

In addition to the RS485 reset there is a logic power-up reset, which holds for approximately 500 ms regardless of the state of the RS485 reset. A time constant determines the power-up reset time. The power-up reset also prevents the module from sending data to the Module Bus. The data transmission rate is 500 kbps.

Serial communication and opto isolation

Isolation section There are two opto isolators, one for data and one for the reset signal. Signals are processed on logical high-low levels even though the output of the opto isolators in the isolation section are analog signals. The reset line is an open collector type, with a pull-up resistor so that the microprocessor is able to use its internal watchdog function.

9 Document No. 8001012-1

Datex-Ohmeda S/5 monitors

Power supply section The module isolated power supply is developed from the +15 Vdirty (non isolated) supply from the Central Unit power supply. The isolated power supply is a switched-mode circuit, where an FET switch is controlled by an oscillator using a bipolar timer. The frequency of the oscillator is approximately 30 kHz, with a pulse ratio of 50%; switching of the FET is slow to suppress spurious interference. A special isolation pulse transformer is used in the circuit. The transformer secondary circuit uses normal linear regulators except for +5 V which uses a low drop type linear regulator.

2.2.2 COPSv board The COPSv board consists of the same functional sections as the COP board, except for the cardiac output self test section. Additionally, the COPSv board consists of the SvO2 measurement section.

SvO2 measurement section The SvO2 algorithm is a part of the COPSv module software. The algorithm consists of five different parts; initialization, calibrations, signal processing and SvO2 calculation, automatic gain control, and signal quality analysis. Initialization When the optical module is connected to the COPSv module, a number of start-up procedures are performed prior to normal operation. These procedures include transfer of calibration factors from the optical module to the COPSv module and initialization of LED currents. Calibration The system is calibrated according to either in-vitro or in-vivo calibration. In-vitro calibration is performed before the oximetry catheter is removed from the package with the catheter tip still inside the calibration cup. The resulting calibration factor is calculated on the basis of the measured ratio of red and infrared signals and the ideal ratio for the calibration cup. In-vivo calibration is performed when the catheter is inserted into the patient’s pulmonary artery. The resulting calibration factor is based on the measured ratio of red and infrared signal and the Hgb and SvO2 values measured in a laboratory. If the calibration is skipped, the result of an old calibration is used instead and the “Not calibrated” message is displayed in the SvO2 number field. Signal processing and SvO2 calculation The reflected red and infrared signals transferred from the optical module to the COPSv module are filtered, and SvO2 is calculated on the basis of the ratio of the two signals. Automatic gain control The intensity of the red and infrared signals can be amplified by four different gains. The gain is selected automatically to achieve optimal signal levels. Signal quality The reflected red and infrared signals are checked for wall contact artifacts, pulsatility and intensity shifts. An index is calculated to indicate the signal quality. 0 indicates a normal signal, 1 indicates an intermediate signal, 2 indicates a poor signal, and 3 indicates an unacceptable signal. Please refer to the service menu section for more information.

10 Document No. 800 1012-1

Cardiac Output Modules, M-COP and M-COPSv

2.3 Connectors and signals 2.3.1 Module bus connector

13

1

25

14

Pin

I/O

Signal

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

I I I I I/O I/O I I O I O I I I O I O I I

RESET_RS485* -15 VDC* +15 VDIRTY* +15 VDC* -DATA_RS485* DATA_RS485* Ground & Shield* -RESET_RS485* CTSB RTSB RXDB TXDB Ground & Shield* +32 VDIRTY GroundDIRTY* CTSC RTSC RXDC TXDC ON/STANDBY BIT0IN RXDD_RS232 TXDD_RS232 +5 VDC* +5 VDC*

*Used in the M-COP module

11 Document No. 8001012-1

Datex-Ohmeda S/5 monitors

2.3.2 Front panel connectors Invasive blood pressure connector (P4)

3 6 1 2

9

4

7

5

8

0

Pin

Signal

1 2 3 4 5 6 7 8 9 0

Pressure 4 + Pressure 4 Polarization - (ground) Polarization + Not connected Not connected Not connected Not connected Ground Cable detection

Cardiac output connector (C.O.)

14

13

12

1 15 11 10 2 16 9 3

17

4 5

6

7

8

Pin

Signal

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

BAB THB BAC Not connected Shield Not connected THD THA THC BAA Not connected Not connected Not connected FL Not connected Not connected Not connected

C.O. Self Test connector (C.O. Test)

4

2

3

1

12 Document No. 800 1012-1

Pin

Signal

1 2 3 4

CTC CTA CTB CTD

Cardiac Output Modules, M-COP and M-COPSv

SvO2 connector (SvO2)

1

14 13 15 12

2

11 16

4

10

6

17

9 8

7

3 5

Pin

Signal

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

IR_CATHODE CE SK DATA_OUT CHASSIS_GND SVO2_GND HEATER_RTN REMOTE_OUT +V_OPT TEMP_SENSOR HEATER_HI LOCAL_OUT REF_RTN LED_ANODE RED_CATHODE DATA_IN -V_OPT

13 Document No. 8001012-1

Datex-Ohmeda S/5 monitors

3

SERVICE PROCEDURES

3.1 General service information Field service of the M-COP and M-COPSv modules is limited to replacing faulty mechanical parts. The COP board and the COPSv board cannot be replaced, and all calibrations can only be done at the factory. Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full type designation, and a detailed description of the fault.

CAUTION

Only trained personnel with the appropriate tools and equipment should perform the tests and repairs outlined in this section. Unauthorized service may void warranty of the unit.

14 Document No. 800 1012-1

Cardiac Output Modules, M-COP and M-COPSv

3.2 Service check These instructions include complete procedures for a service check. The service check is recommended to be performed after any service repair. However, the service check procedures can also be used for determining possible failures. The procedures should be performed in ascending order. The instructions include a check form (Appendix A) which should be filled in when performing the procedures. The mark

? in the instructions means that the check form should be signed after performing

the procedure.

The procedures are designed for monitors with S/5 monitor software of revision 01. However, most of the procedures also apply to monitors, which contain some other monitor software type/revision.

3.2.1 Recommended tools Tool

Order No.

Notes

Patient simulator SvO2 simulator

890121

Pressure manometer InvBP transducer Catheter connecting cable Screwdriver

All modules •

Detach the module box by removing the two screws from the back of the module. Be careful with the loose latch and spring locking pin.

1.

Check internal parts: •

screws are tightened properly

•

cables are connected properly

•

all socket mounted IC’s are inserted properly

•

EMC covers are attached properly

•

there are no loose objects inside the module

? 2.

Check external parts:

15 Document No. 8001012-1

Datex-Ohmeda S/5 monitors

•

the front cover and the front panel sticker are intact

•

all connectors are intact and are attached properly

•

the module box, latch and spring locking pin are intact

? • • •

Reattach the module box and check that the latch moves properly. Turn the monitor on and wait until the monitoring screen appears. Configure the monitor screen so that all the required parameters are shown, for example :

Monitor Setup - Screen 1 Setup - Waveform Fields - Field 4 - P4 Digit Fields - Field 4 - SvO2 •

Preset the C.O., SvO2 and InvBP measurement settings:

Others - C.O. View - C.O. Setup - Scale - 1.0 °C Injectate Volume - 10 ml Measurement Mode - SET SvO2 - Update Hgb - 115 g/l

Invasive Pressures - P4 Setup - Label - PA 3.

Plug in the module. Check that it goes in smoothly and locks up properly.

4.

Check that the module is recognized by entering the C.O. View menu:

?

Others - C.O. View Check that the message “No Catheter” is shown in the middle of the menu and the message “No cable” in the digit field for SvO2, if it is an M-COPSv module.

? 5.

Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8) Take down the information regarding COP software by selecting SCROLL VERS and turning the ComWheel.

? 6.

Enter the COP module service menu: Parameters - COP Check that the “Timeouts”, “Bad checksums” and “Bad c-s by mod” values are not increasing faster than by 50 per second. Check that the module memories have passed the internal memory test, i.e. “RAM”, “ROM” and “EEPROM” all show OK.

16 Document No. 800 1012-1

Cardiac Output Modules, M-COP and M-COPSv

? Invasive blood pressure measurement 7.

Check the front panel membrane key ZERO P4. Press the key for at least one second. Check that the key being pressed is identified, i.e. the information on the service menu under “Button” - “P4” changes from OFF to ON.

?

8.

Check that “Cable” and “Probe” for P4 show OFF. Plug a cable with an invasive blood pressure transducer into the front panel connector P4 and check that “Cable” and “Probe” show ON and the corresponding pressure waveform appears on the screen.

?

9.

Calibrate InvBP channel P4 according to the instructions in the Technical Reference Manual.

10.

Return to the normal monitoring screen by pressing the “Normal Screen” key on the Command Board. Check the InvBP channel with a patient simulator. The settings and checks with a Dynatech Nevada medSim 300 Patient Simulator are:

?

SENSITIVITY -switch; 5 µV/V/mmHg ECG - BASE - BPM - 60 BP - 3 - WAVE - ATM Connect the cable from channel BP3 to module connector P4. Zero the InvBP channel P4 by pressing the ZERO P4 key on the module front panel. BP - 3 - WAVE - PA Check that appropriate InvBP waveforms are shown and the InvBP value is approximately 25/10 (±2 mmHg) for channel P4 (PA).

?

SvO2 measurement 11. Enter the COP module service menu. Check that the SvO2 values “Meas. state”, “OM fail” and “OM temp.” all show NO OM. Turn the SvO2 simulator’s pulsation switch to “Medium” and the range switch to “Normal pulse”. Connect the simulator to the module and check that the messages “Initializing, please wait”, “Warming up” and “Not calibrated” appear in the digit field for SvO2. Initializing, please wait --> Warming up --> Not calibrated 17 Document No. 8001012-1