GE Critikon Dinamap Compact User manual

™

DINAMAP

Compact

Vital Signs Monitor

Portable Adult/Pediatric

and

Neonatal Monitoring

Service Manual

Part No: 776-856

1

List of Effective Pages

Part No./Rev Page No. Date of Latest Revision

776856 All Original (May. 2000)
776856B All June 2001

U.S. Patent 5,579,776 U.S. Patent 4,754,761
U.S. Patent 5,170,795 U.S. Patent 4,501,280
U.S. Patent 4,349,034 U.S. Patent 4,638,810
U.S. Patent 5,052,397 U.S. Patent 4,546,775
U.S. Patent 4,360,029 U.S. Patent 4,638,810
U.S. Patent 4,543,962 U.S. Patent 4,546,775
Patents Pending U.S. Patent 5,518,000

European Patents:
104771 104772 217918 225256 335357

CAUTION: Federal (U.S.A.) law restricts this device to sale by or on order of a health care
practitioner.

The contents of this document, including all figures and drawings, is proprietary information of
GE Medical Systems, provided solely for purposes of operation, maintenance, or repair of
Dinamap™ Compact Monitors.

Dissemination for other purposes or copying thereof without the prior written consent of GE
Medical Systems, Tampa, Florida, is prohibited. Illustrations may show design models;
production units may incorporate changes.

©GE Medical Systems Information Technologies 2001 TAMPA, FL 33614
Printed in the U.S.A. All rights reserved.

Reissues and Updates

Changes occurring between issues are addressed through Change Information
Sheets and replacement pages. If a Change Information Sheet does not
accompany this manual, it is correct as printed.

Errors & Omissions Excepted

If, in the normal use of this manual, errors, or incorrect data are found, please notify:

United States
GE Medical Systems Information Technologies.
4502 Woodland Corporate Boulevard
Tampa, FL 33614

United Kingdom
Monitor House
Unit 3 Cherrywood
Chineham Business Park
Basingstoke
Hants RG24 8WF

2

DINAMAP™ Compact Vital Signs Monitor Model TS

3

TABLE OF CONTENTS

1 INTRODUCTION 7

1.1 Scope of Manual 7

1.2 Warranty and Service 7

1.2.1 Packing Instructions 8

1.2.2 Service Loan Units 8

1.2.3 Repair Parts 8

1.2.4 Replacement Accessories 9

1.3 Service Centers 9

1.4 Installation and Operation 10

1.5 Warnings & Precautions 10

1.6 Symbol Definitions 10

1.6.1 Safety Symbols 10

1.6.2 Key and Display Symbols 10

1.6.3 Connector Symbols 11

1.7 Electrical, Mechanical & Environmental Specifications 11

2 PRODUCT DESCRIPTION 15

2.1 Introduction 15

2.2 Physical Description 15

2.3 Overall Principles of Operation 19

2.4 Functional Description 19

2.4.1 System Processor 19

2.4.2 Temperature System (TS & T models only) 20

2.4.3 NIBP System 21

2.4.4 Pneumatics System 21

2.4.5 SpO2 System (TS & S models only) 23

2.4.6 Power Supply 23

2.4.7 Audio Amplifier 24

2.4.8 Alarm and Communication Interfaces 24

2.4.9 User Controls 25

2.4.10 Displays 25

2.4.11 Printer 26

3 MAINTENANCE 27

3.1 General Maintenance 27

3.1.1 Replacing Fuses 27

3.1.2 Periodic Maintenance 27

3.1.3 Care of the Storage Battery 28

4

3.2 Service Modes 29

3.2.1 The Clinician Menu (Service mode 1 2 3 4) 31

3.2.2 The Service Menu (Service mode 2 2 1 3) 32

3.3 Calibration - Checking & Re-calibrating 36

3.3.1 Checking of NIBP Calibration 36

3.3.2 NIBP Calibration 37

3.3.3 NIBP Pop Off Checking 38

3.3.4 NIBP Pop Off Pressure Calibration 39

3.3.5 Predictive Temperature Calibration Check 40

3.3.6 Predictive Temperature Calibration 40

3.4 Monitor Disassembly 42

3.4.1 Removal of the Front Panel 42

3.4.2 Removal of the Switch board, Display board and Liquid Crystal Display module 44

3.4.3 Removal of the Chassis 46

3.4.4 Removal of the Main Board and Power Supply board from the chassis 47

3.4.5 Removal of the Pump and Pressure Transducer 48

3.4.6 Removal of the Printer 49

3.4.7 Reassembling the Monitor 50

4 MANUAL RELEASE TEST PROCEDURE 51

4.1 General 51

4.1.1 Test Equipment 51

4.1.2 Test Conditions 51

4.1.3 Service mode 51

4.2 Test Procedure 52

4.2.1 Power Up Tests 52

4.2.2 External DC Supply and Battery Indication Operation 52

4.2.3 Temperature Requirements 52

4.2.4 Pulse Oximeter Requirements 53

4.2.5 NIBP Requirements 54

4.2.6 Printer Operation 55

4.2.7 Calibration Time Stamp 55

4.3 Manual Release Test Results Sheets 56

5 TROUBLE SHOOTING. 58

6 TECHNICAL INFORMATION 64

6.1 Host Port Connector (rear panel) 64

6.2 Remote Alarm Connector (rear panel) 64

6.3 Accessory Part Numbers 65

6.4 DINAMAP™ Compact Service Spares List 69

6.5 Procedural & Error Alarm Code Table 75

5

7 GLOSSARY OF TERMS AND ABBREVIATIONS 77

8 SERVICE DIAGRAMS 78

6

1 Introduction

1.1 Scope of Manual

This Service Manual provides service and parts repair information for the DINAMAP™ Compact Vital Signs
Monitor.

This manual is intended for use by service technicians who are familiar with electromechanical devices and
digital and analog circuit techniques.

!

WARNING

To reduce the risk of electric shock, do not remove the instrument’s covers.

Refer servicing to qualified service personnel.

Only trained service technicians should perform repairs on this equipment.

Take particular care when servicing the power supply assembly.

For information about operating the monitor in a clinical environment, refer to the DINAMAP™ Compact Vital
Signs Monitor Operation Manual (p/n 776-980.)

1.2 Warranty and Service

The warranty for the product is enclosed with the product in the shipping carton. All repairs on products
under warranty must be performed by or approved by Technical Service personnel. Unauthorized repairs
will void the warranty. Qualified electronic service personnel should repair products not covered by
warranty.

Extended warranties may be purchased for most products. Contact your sales representative for details and
pricing.

If the product fails to operate correctly, or if assistance, or service is required, contact the Technical Support
Department at Critikon. Before doing so, it is helpful to attempt to duplicate the problem and to confirm the
correct operation of all the accessories to ensure that they are not the cause of the problem.

Prior to calling, please be prepared to provide:

?? the product name and model number
?? a complete description of the problem

and if repair parts or service are necessary:

?? the product serial number
?? your business name and address, and Critikon Company account number
?? a purchase order number if parts or service are to be purchased
?? the part number of the required spare parts

7

If your monitor requires warranty, extended warranty, or non-warranty service, call Technical Support and a
representative will assist you. To expedite service where the product has external chassis or case
mechanical damage, please advise the Technical Service representative when you call.

The representative will record all the necessary details and will provide the information, which is required for
all returned products.

Prior to returning the monitor, contact GE Medical Systems Information Technologies:

1-877-274-8456

This service is available Monday to Friday between the hours of 8 am and 7 pm EST excluding holidays.

1.2.1 Packing Instructions

?? Remove all hoses, sensors, power cables and the battery from the monitor.
?? Only pack the accessories, which you are requested to return, and pack these in a separate bag

within the same carton as the monitor.

?? Use the original shipping carton and packing materials, if available.
?? Place the monitor in a plastic bag and tie or tape it shut to prevent loose particles entering the

product.

?? Pack 4 to 6 inches of padding around all sides of the monitor.
?? Use packing tape to securely close the carton.

Insurance is at the customer’s discretion. Any claims for damage must be initiated by the sender.

1.2.2 Service Loan Units

A loan unit is provided on request, at no charge during the service life of the product, while Critikon is
performing the repair. The loaner equipment will be shipped to your site within 2 business days.

?? Critikon will pay for shipping the loaner unit to the customer during warranty repairs.
?? The customer must pay shipping charges when a loaner unit is issued for a non-warranty repair.
?? The customer must pay shipping charges when a loaner unit is returned.

All loaner units must be returned within the time specified otherwise a rental fee may be incurred.

1.2.3 Repair Parts

Repair parts can be ordered from Customer Care via telephone or fax. Complete assemblies such as the
power supply board are available on an exchange basis. Contact Technical Support for details.

Fax: [phone]
Please allow one working day for confirmation of faxed orders. All such orders must contain the following

information:

?? Your business name, address and telephone number
?? Your fax number
?? Your purchase order number
?? Your account number.

8

1.2.4 Replacement Accessories

Replacements such as hoses and sensors must be purchased from GE Medical Systems.
Tel: [phone]
Please have your account number and the reorder / product code available for the item you wish to order.
A table of accessories and replacement part numbers appears in section 6.3.

1.3 Service Centers

For service, repairs or parts information, contact either the following Critikon office or your local Critikon
Sales Representative

North America

GE Medical Systems Information Technologies
4502 Woodland Blvd
Tampa, FL, 33614
877-274-8456

9

1.4 Installation and Operation

For information on the installation and/or operation of the DINAMAP™ Compact Vital Signs Monitor,
reference must be made to the DINAMAP™ Compact Vital Signs Monitor Operation Manual. This instrument
is to be operated and serviced by authorized personnel only, and only in accordance with the Warnings and
Precautions given in both the DINAMAP™ Compact Vital Signs Monitor Operation Manual and this
document.

1.5 Warnings & Precautions

Refer to the safety warnings and precautions detailed in the DINAMAP™ Compact Vital Signs Monitor
Operation Manual.

This manual is intended for use by authorized personnel who are familiar with digital and analog electronic
principles and who are also familiar with the operation of the DINAMAP™ Compact Vital Signs Monitor.
Disconnect all the power sources before removing covers.

1.6 Symbol Definitions

1.6.1 Safety Symbols

ATTENTION: Read accompanying
documents

Equipment complies with IEC601-1 (1988)
Type B.F.
Defibrillator protected.

1.6.2 Key and Display Symbols

Power Off/On

Silence Alarms

NIBP

STAT

MAP

* = TS & S models only
** = TS & T models only

SpO

Predictive
Temperature **

Battery Power

External Power

Beats Per Minute

*

2

10

1.6.3 Connector Symbols

External Alarm Connector

External Comms Port Connector

Fuse

External Power

1.7 Electrical, Mechanical & Environmental Specifications

NIBP

CUFF PRESSURE RANGE: Adult / Pediatric: 0 mmHg to 290 mmHg

Neonate: 0 mmHg to 140 mmHg

DEFAULT TARGET Adult / Pediatric: 178 ± 15 mmHg
CUFF INFLATION: Neonate: 110 ± 15 mmHg

TARGET CUFF INFLATION Adult / Pediatric: 100 to 250 mmHg; 5 mmHg increments
ADJUSTMENT RANGE: Neonate: 100 to 140 mmHg; 5 mmHg increments

BLOOD PRESSURE
MEASUREMENT RANGE:

Adult / Pediatric: 30 - 245 15 - 215 10 - 195
Neonate: 40 - 140 30 - 115 20 - 100

BLOOD PRESSURE ACCURACY: Meets AAMI/ANSI SP-10 Electronic or Automated

BLOOD PRESSURE 20 seconds to 45 seconds typical
DETERMINATION TIME: Adult: 120 seconds maximum,

Neonate: 85 seconds maximum.
PULSE RATE DETERMINATION: Adult / Pediatric: 30 - 200 BPM

Neonate: 30 - 200 BPM

PULSE RATE ACCURACY: ± 3.5 percent
OVERPRESSURE CUT-OFF: Adult / Pediatric 300 - 330 mmHg

Neonate 150 - 165 mmHg

Systolic

mmHg

Sphygmomanometer Standard for Accuracy. (AAMI/ANSI
standard :± 5 mmHg mean error; 8 mmHg standard deviation;
intra-arterial method.)

MAP mmHg Diastolic

mmHg

Predictive Temperature Determination (TS & T models)

RANGE: Max. 42.2 ?Celsius 108.0° Fahrenheit

Min 31.1?Celsius 88.0° Fahrenheit
PROBE ACCURACY: ? 0.1oC ± 0.2oF

11

PREDICTIVE TEMPERATURE ? 0.6oC, 36.1 - 39.4 oC ± 1oF, 97 - 103 oF
ACCURACY : UNSPECIFIED < 36.1OC, > 39.4 OC

UNSPECIFIED < 97 OF, > 103 OF

DETERMINATION TIME: 30 seconds typical; 60 seconds maximum

SpO2 (TS & S Model)

OXYGEN SATURATION
RANGE: 0 to 100%

SATURATION ACCURACY: 0% to 69%: unspecified

ADULT ACCURACY (70-100%)

Nellcor Puritan Bennett™ Sensor Accuracy
OXICLIQ-P Pediatric sensor 2.5 digits

OXIBAND Pediatric/infant sensor 3.0 digits
DURA-Y ear clip 3.5 digits
OXISENSOR II D-20 Pediatric sensor 3.5 digits
OXICLIQ-N neonatal/adult sensor 2.5 digits
REFLECTANCE sensor 3.5 digits
DURASENSOR adult 3.0 digits
OXIBAND adult/neonatal sensor 3.0 digits
DURA-Y multisite sensor 3.0 digits
OXISENSOR R-15 adult nasal sensor 3.5 digits
OXISENSOR II D-25 adult sensor 2.0 digits
OXICLIQ-A adult sensor 2.5 digits
OXISENSOR II N-25 neonatal/adult sensor 2.0 digits
OXISENSOR II I-20 infant sensor 2.0 digits
OXISENSOR II D-25L adult sensor, long cable 2.0 digits

Neonatal Accuracy:

When sensors are used on neonatal subjects as recommended, the specified accuracy range is increased
by ?1 digit to account for the theoretical effect on oximeter measurements of fetal hemoglobin in neonatal
blood (e.g., N –25 accuracy on neonates is ?3, rather than ?2.)

Note: Refer to NELLCOR PURITAN BENNETT sensor specifications.

PULSE RATE DETERMINATION: 20 BPM - 250 BPM +/- 3 beats
SATURATION PITCH INDICATOR: Pitch changes with saturation.

Volume selectable from 0 (off) to 9.

WAVEFORMS: Pulse Plethysmograph waveform on LCD gain compensated
SENSOR DISCONNECT / The monitor will detect the attachment or disconnection

DISCONNECT FROM PATIENT: of a sensor from the patient within 5 seconds.
PULSE DETECTION: The monitor will detect a pulse or enter a no signal state within 15

seconds of being attached to the patient.

12

LOSS OF PULSE: The monitor will detect loss of pulse from patient and
enter a no signal state within 10 seconds.

Mechanical

DIMENSIONS: Height: 9.1 in (23.0 cm)

Width: 7.3 in (18.5 cm)
Depth: 6.9 in (17.5 cm)

WEIGHT including battery: 8.3 lb (3.75 kg)
MOUNTINGS: Self-supporting on rubber feet or pole mountable.
PORTABILITY: Carried by recessed handle or pole mounted.
CLASSIFICATION INFORMATION: • Mode of Operation - Continuous

• Degree of Protection against harmful ingress of water: (See
IPX1 definition).

Power Requirements:

POWER CONVERTER: Protection against electrical shock - Class 1
INPUT VOLTAGE: 115 / 230 VAC, 50 / 60 Hz (nominal),

90 ~ 264 VAC, 47 ~ 63 Hz (range)

MONITOR: Protection against electrical shock - Class 1
INPUT VOLTAGE: 24 VDC (nominal), 12-30 VDC from supplied power converter
EXTERNAL DC LINE FUSE: T3.15A 250 VAC
BATTERY: 12 volt, 2.3 amp-hours.

Minimum operation time: 2 hours (5 minute auto cycle with adult

cuff at 25°C with power save mode enabled) from full charge.
Time for full recharge: 8 hours from full discharge

Environmental

OPERATING TEMPERATURE: + 5° C to + 40° C (+ 41° F to + 104° F)
OPERATING ATMOSPHERIC

PRESSURE RANGE: 700 to 1060 hectoPascal
STORAGE TEMPERATURE: –20° C to + 50° C (– 4° F to + 122° F)
STORAGE / TRANSPORTATION

ATMOSPHERIC PRESSURE: 500 to 1060 hectoPascal
HUMIDITY RANGE: 0 % to 95 % non-condensing
RADIO FREQUENCY Complies with IEC Publication 801-3 (Draft 7, second edition)
ELECTROMAGNETIC IMMUNITY: 3.0V/m, modulation 80% AM @ 1kHz, frequency range

26.0~1000.0Mhz

13

0086

IPX1

This product conforms with the essential requirements of the Medical Device Directive.
Accessories without the CE Mark are not guaranteed to meet the Essential
requirements of the Medical Device Directive.

The DINAMAP™ Compact monitor is protected against vertically falling drops of water
and conforms to the IEC 529 standard at level of IPX1. No harmful effects will come of
vertically falling drops of water making contact with the monitor.

14

2 PRODUCT DESCRIPTION

2.1 Introduction

The DINAMAP™ Compact series of monitors are portable devices, provide non-invasive determination
systolic and diastolic blood pressure, mean arterial pressure (MAP), pulse rate, predictive temperature and
blood oxygen saturation for neonatal and adult/Pediatric patients. Certain model variants are not equipped
with all functions. The monitors are mains or battery operated, and are primarily intended for use in hospital
acute care settings such as Day Surgery, Accident & Emergency, ITU, High Dependency Units, Labor and
Delivery, GI/Endoscopy, and Medical/Surgical Units.

2.2 Physical Description

Each monitor is supplied with an accessory pack. The contents of the pack vary according to model and are
listed below:

Model: DINAMAP™ Compact BP Monitor
Qty Description
1 DINAMAP™ Compact Monitor with integral printer

1 AC-DC Power Converter
2 Mains power leads
1 Rechargeable Battery
1 Cuff, Standard Adult
1 Pneumatic Hose, 12 ft., Standard Adult
2 Printer paper rolls
1 Operating Instruction Manual

Model: DINAMAP™ Compact TS & T Monitors are supplied as above, with the addition of:
Qty Description
1 Nellcor Puritan Bennett™ Finger sensor

1 Nellcor Puritan Bennett™ sensor extension cable

Models TS and T are supplied with the Predictive Temperature Kit. This is comprised of the following
items:

Qty Description
1 Oral Temperature Probe

1 Probe holder accessory
2 Pack of 20 probe covers
1 Instruction sheet

15

Rear Panel Connections

2

6

1

5

T3.15A 250V

4

3

1

2

3

4

5

6

BATTERY COVER Securely retains and protects the internal battery.

EXTERNAL POWER Connection socket for the supplied external power

DATA INTERFACE

REMOTE ALARM

POLE CLAMP

FUSE HOLDER

CONNECTOR

CONNECTOR

Used to clamp the monitor to a pole or stand.

converter ONLY.

External power source line fuse holder.

Host communications port: 15 way D-type RS232 serial
port for use with equipment conforming to IEC-601 only.

Remote Alarm port with both normally open and
normally closed isolated contacts for use with equipment
conforming to IEC-601 only. (if so equipped)

16

Front Panel Controls & Indicators (TS Model shown)

17

19

7

8

9

10 ROTOR

CONTROL

11 LCD

12

13

14

15 SYSTOLIC

PRESSURE

16 DIASTOLIC

PRESSURE

15

16

20

21

22

11

8

7

9

27

This push button switch controls the ON/
OFF state of the monitor. Push for power
ON and again for power OFF.

This green LED indicates the external
power and battery charging status of the
monitor.

This yellow LED indicates operation and
charge status of the internal battery.

This is used to highlight and select items in
the LCD menus. If the monitor is OFF,
pushing it will switch the monitor ON.

This panel displays all alarms, user
interface messages & configuration
options.

Press this key to begin or halt an NIBP
determination. The key also cancels STAT
mode.

Press this key to begin or halt operation of
the STAT mode of NIBP monitoring.

This switch alternately mutes & enables
the audio alarm. When pressed once
(SILENCE ON) the switch lights indicating
audible alarms have been silenced.

This 3 digit red LED display indicates the
measured systolic B.P. in mmHg.

This 3 digit red LED display indicates the
measured diastolic B.P. in mmHg.

2526

18

19 PULSE BPM

20

21

22 °C °F DISPLAY

23 TEMP. PROBE

24 SpO2 SENSOR

25 CUFF

26 LIGHT SENSOR

27 PRINTER DOOR

DISPLAY

CONNECTOR

CONNECTOR

CONNECTOR

10

18

14

13

12

23

24

This 3 digit LED indicates SpO
Oxygen Saturation in %. =

This 3-digit yellow LED display
shows pulse rate in Beats Per
Minute.

This yellow LED flashes, indicating
real-time pulse rate measurements
are derived from the SpO2 signals.

This 4 digit red LED Display
indicates the measured
Temperature.

These indicate that Temperature is
being displayed in degrees Celsius
or Fahrenheit.

Plug the predictive temperature
probe cable into this socket.

Attach the SpO2 sensor extension
cable to this socket. =

Insert the NIBP Cuff hose into this
connector.

Automatically measures ambient
light to set LED display intensity.

Open this door to gain access to the
paper.

?

17

17

This red LED display indicates the
measured mean arterial B.P. in mmHg. It
also shows instantaneous cuff pressure
during an NIBP determination.

= TS & S models only

18

2.3 Overall Principles of Operation

This section of the manual describes the principles of operation of the DINAMAP™ Compact monitor. The
section is arranged to give an overall description of the instrument, the following sections then detail each of
the functional systems. For full assembly drawings, circuit diagrams and parts lists of the component circuit
boards, refer to section 8 of this manual. The system block diagram of the DINAMAP™ Compact monitor is
shown in drawing 8600EB.

Patient vital signs can be measured by a variety of electronic sensors, including oscillatory pressure sensors
for Non-Invasive Blood Pressure measurement. Both the DINAMAP™ Compact T and TS models are
provided with a predictive temperature parameter determination. The Compact TS model is also equipped
with a Nellcor Puritan Bennett™ Blood Oximetry module enabling oxygen saturation and heart rate to be
determined from information received via a finger sensor.

Operator access is via buttons and the rotor located on the front panel. A liquid crystal graphics display
module provides the user with menu, alarm and status information as well as a plethysmograph display or a
record of previous measurements. Parameter information is presented by multiplexed seven segment LED
displays and discrete LED indicators. A thermal printer provides hard copies of patients vital signs either
automatically or on demand. A built-in speaker and piezo-electric sounder advise the user of pulse signals
and alarm conditions.

The monitor is designed to operate from AC mains via the supplied power converter, or from an internal
rechargeable battery. The external AC power converter rectifies the mains to produce a raw DC supply
which is regulated internally to provide the DC operating power. The external raw DC source is employed to
charge the internal batteries. The real time clock and user monitor settings are maintained by an internal
rechargeable NiCd backup battery.

The monitor includes a pneumatics system required for NIBP operation. NIBP determinations are made by
pumping up the air pressure in a restrictive cuff and monitoring the oscillatory signals in the system as the
pressure is released. Large deflation steps are employed for NIBP and the system processor interpolates
measurements between steps. The pneumatic system then regulates operation of the pneumatic pump and
valves. An overpressure sensor provides independent protection against over-inflation. Protection against
deflation failure is inherent in the design; the valve and pneumatic system being designed to auto-deflate
the system in the event of power fail or alarm situations.

Blood Oximetry (SpO2) determinations (model TS only) are made using a proprietary module from Nellcor
Puritan Bennett™, which communicates the parameter measurements to the system processor via an
internal serial port.

Predictive temperature measurements are based on a 3 or 12-minute mercury in glass reference. Predictive
Temperature probes can be connected to the monitor to provide an analog signal representing the
measured temperature. An A/D converter then digitizes this analog signal; this information is then
interpreted by the system processor and displayed for viewing.

2.4 Functional Description

The functions of the DINAMAP™ Compact monitor can be separated into eleven discrete parts. The
following paragraphs describe each of the Monitors, with full circuit diagrams provided in section 8.

2.4.1 System Processor

The system processor is based on 68302 microprocessor IC22 on the Main Board. A master 19.6608 MHz
clock generated by XL1 exits the system processor at pin 98 and is divided by 16 inside binary ripple

19

counter IC36 to provide the 1.23 MHz ADC clock. Communication between microprocessor IC22 and all bus
devices is provided by a 24-bit address bus, 8-bits data bus and the three wire serial peripheral interface
(SPI) bus. The system processor is equipped with a watchdog timer and reset circuit.

The system program is stored in a 4 Mbit FLASH memory IC28 as 512k by 8 bit words. Program memory is
provided by a low power 1 Mbit SRAM IC32 formatted as 128k by 8 bit words. Non-volatile settings are
stored in an EEPROM IC26 which talks to a dedicated serial port on the system processor. All bus devices
are powered from the +5VD digital supply, except for the RAM that is also powered from the VRAM supply
when the system is in “standby” mode.

Should the software detect a system fault or fail to reset its watchdog timer, the system processor will output
a logic low level on its watchdog output WDOG. This is latched as FAILSAFE by the output of the bistable
formed by IC31, allowing the output of the relaxation oscillator IC1 to pass through IC4 to sound the piezo
sounder LS1. The FAILSAFE signal is also used to disable the isolated power supply module PM100.

The power supply board battery backup voltage BATT_BACKUP, derived from either NiCd battery or an
external supply, appears on the supervisory circuit IC35. This supervisory circuit has two functions. First, it
generates Reset and Halt signals for the system processor when the 5 volt power supply powers on and off
respectively. Secondly, it controls transistor TR8, allowing the 5 volt line to power the RAM chip IC32 and
PIC when the system is “on”, or the BATT_BACKUP to power the RAM and the PIC when the system is
“off”. This allows values to be saved in the otherwise volatile RAM and to maintain the low power standby
mode of the PIC.

Additional control signals from the system processor are decoded by IC16, which generates seven chip
select lines and IC17 which generates latch outputs for the LED display drivers. The data bus D0 ~ D7 is
filtered by inductors L12~19 to produce a buffered data bus DB0 ~ DB7 for the display drivers.

There is also a PIC micro-controller IC5 on the power supply board 8620AB, which has its own independent
watchdog, reset circuit and provides the real-time clock function. The PIC provides control of PSU status,
battery charging, printer and alarm/annunciator audio output. Communications between the system
processor and the PIC are continually monitored in order to provide additional fail-safe security for the
monitor. All measurement, alarm and communications ports of the instrument are isolated to IEC601.

2.4.2 Temperature System

The temperature system for the Model DINAMAP™ Compact Monitor for reading predictive thermistor probes
is located on the Main Board.

If a thermistor probe is used, the resistance of the probe varies in relation to temperature. The probe
resistance is effectively in parallel with R63 and therefore a change in temperature results in a change in
voltage applied to input selector IC19. The selected input voltage from IC19 is connected to the voltage to
frequency converter (VFC) IC18. The frequency of the square wave output from the VFC varies
proportionately to the input voltage. The output signal is isolated through opto-coupler PC2 and enters the
system processor, as PRED_TEMP_F. The processor receives the square wave signal and determines the
temperature by counting the number of edges received per unit interval.

Through the application of a software algorithm, the system processor provides two select lines TEMP_SEL0
and TEMP_SEL1. These are isolated by opto-isolators PC3 and PC4 and used to control the input selector
IC19, allowing the appropriate resistor tree to be selected. There are four selectable channels, two providing
calibrations points, a third used for probe type detection and the fourth for the thermistor measurement.

The probe type is determined by measurement of the frequency produced by the VFC from a DC input
derived from resistor tree R59-R61; for an oral probe this produces a frequency equivalent to 42 degrees
Celsius, Rectal probes short out R61 and hence change the frequency slightly. The software is capable of
determining which probe type is attached and hence selects the appropriate measurement mode.

20

Compensation for drift in accuracy of the system is achieved by the unit recalibrating itself on switch on and
after each measurement and at ten-minute intervals. Calibration is achieved by measuring two points on the
high precision resistor chain of RV3, R70, and R74-77 which equate to 10°C and 37°C. Any changes in
VREFI or voltage to frequency transfer characteristic can therefore be accommodated within reason.

The temperature circuit is powered from an isolated 5-volt and ?9 volt supply (5 and ?15V on revision 04
and earlier), these supplies are generated by the isolated power supply module PM100. Calibration of the
voltage and hence frequency in the temperature reference circuit is achieved by the use of resistor trees,
attached to a stable reference voltage. This reference, VREFI is 3.24 volts (nominal) and is generated from
the isolated 5-volt line by D2, adjustment provided by RV2. Thus RV2 will adjust the overall calibration of
voltage ranges X0, X1 and X2. Additional adjustment of the calibration points X0 and X1 is provided by RV3
in their resistor tree. Together RV2 and RV3 are used to calibrate the temperature circuit.

The VREFI may be measured across TP3 and TP2, and the PRED_TEMP_F signal may be measured
across TP9 and TP6.

2.4.3 NIBP System

The non-invasive blood pressure system measures blood pressure and pulse rate. The NIBP measurement
circuitry is located on the Main Board.

To measure blood pressure, a reference voltage generated by IC2 supplies a bridge pressure transducer
ML1 to enable it to convert air pressure from the pneumatics system into an analog voltage. The
instrumentation amplifier IC5 amplifies this voltage. The unfiltered signal PT1 is routed to into an eight
channel analog multiplexer, IC20. When selected, the output signal is buffered by IC21 as signal
BUF_ANA_MUX and enters the ADC IC23. The digitized output of the ADC is presented to IC24, an octal
buffer/line driver, from where it is transmitted to the data bus and the system processor. Pressure
transducer offset PT1_REF from the output of IC2 also enters the analog multiplexer IC20. When selected,
it provides an off-set value to the system processor. The processor then measures the offset value and
subtracts the offset from PT1 measurements. The control signals for the multiplexer (ASEL0 ~ ASEL2) are
generated by the system processor.

The pulse rate component (typically one percent) of the cuff pressure signal is filtered and separated from
the PT1 pressure signal. The low pass filter formed around IC9a allows the low frequency pulse signal
through whilst attenuating any higher frequency noise. The signal is then ac coupled by the high pass filter
of C20 & R41 in order to strip off the small pulse rate signal from the cuff pressure signal. IC9b then
amplifies the pulse signal before being applied to high pass filter IC12. The output from IC12 FPT1 is routed
to the analog multiplexer IC20 for selection by the system processor. The system processor controls the
analog switch IC7, it is used to clamp and apply offset signals into the filtered pressure measurement
channel.

The system software includes an internal on-line self-test feature for the FPT channel at power-up and after
each non-STAT mode determination.

2.4.4 Pneumatics System

The pneumatics system provides air pressure for the NIBP cuff, manifolding for control of cuff pressure, and
an overpressure signal to the system processor and pneumatic control logic GAL if the pressure exceeds
300 mmHg in adult mode or 158 mmHg in neonate mode. The system is comprised of an air pump, pressure
transducer, overpressure detection circuitry, power control circuit, and two solenoid-operated pneumatic
valves. Air from the pump is routed through the dump valve to the cuff output manifold.

The pneumatics system provides control of the pump by commands received from the system processor.
The PUMP_ON signal from latch IC3 on the Main Board is passed to the pneumatic control logic GAL IC1 on
the power supply board. The GAL produces a pump drive signal which turns on FET TR4b, TR13 and TR8,
pulling down the ground return side of the pump motor through current sensing resistor R31. Both the

21

Deflate and Dump valve control signals are also generated by latch IC3 (Main Board) and passed to the GAL
IC1 (power supply board). Pump motor current is sensed in R31 and amplified by IC4. This is routed to the
system processor as PUMPC and also compared to a reference to produce an over current input signal to
the GAL. If pin 9 of GAL IC1 goes high, pin 12 (signal LATCHED_OVC) will be latched high and the pump
enable output will go high switching off the pump. The latched over current condition can be reset by the
Main Board processor asserting PNEURESET high.

The Deflate valve vents the system to atmosphere in its energized state. When the pump is operating, the
deflate valve is de-energized by the GAL IC1 turning off FET TR1b in the ground return side of the valve
circuit. If a failsafe, overpressure or deflate condition signal arrives on the GAL, the valve will be energized
and the system will rapidly deflate. The over-pressure signal is produced by the pump pressure transducer
and associated electronics, while the failsafe can be derived from the system processor’s watchdog output
as well as from the PIC IC5.

Conversely, the Dump valve vents the system to atmosphere in its de-energized state. When the pump is
operating during a determination cycle, the Dump valve remains energized, the GAL receiving a high level
DUMP signal from the latch IC3 on the Main Board. When the determination cycle is complete, or if an alarm
condition arises, the DUMP signal from latch IC3 will go low causing the GAL to turn off FET TR4a and de­energize the dump valve, opening the system to atmosphere.

Because the action of deflation can be initiated by energizing one valve or de-energizing another, a power
failure during a determination will always result in de-pressurization of the system.

The action of operating the Dump and Deflate valves produces a voltage across R20/21 and R66. This
signal is labeled VALVESENSE and is routed to the multiplexer IC20 on the Main Board from where it can
be selected by the system processor. The four possible conditions of the Dump and Deflate valves can be
ascertained from the VALVESENSE signal.

Once the system processor has determined which cuff type is being used, it instructs latch IC3 to output an
ADULT signal to TR1. In the pump pressure transducer circuit on the Main Board, IC8 generates a high
precision 5 volt reference, which is made available to dual op-amps IC10 and IC21. This reference is
monitored by the system processor as PT2_REF. The buffered reference from IC21 is applied to excite the
pump output pressure transducer ML2 on the Main Board (Transducer mounted on Pump assembly on
revision 04 and earlier). The output of the transducer varies in proportion to the air pressure in the system.
The transducer ML2 output pins connect to IC11, an instrumentation op-amp in differential mode
configuration. An offset voltage derived from the voltage reference IC8 is buffered by IC10b and fed to IC11
it is then summed with the amplified difference signal from the transducer. IC11’s output is passed to the
analog multiplexer IC20 as PT2 and the inverting input of comparator IC15a where it is compared to the
over pressure limit.

Note: For revision 04 units and earlier the reference to IC25 on the Main Board in the following paragraphs
relates to IC10.

The system processor produces control signals POT_INC, POT_U/D and POT_CS to drive a digital
potentiometer IC13 which sets the gain of amplifier IC25a and hence the over pressure limit. The “high” end
of the digital pot is connected to the output of the output of IC25a while the “low” end of the pot connects to
the precision resistor chain formed by R47, 48, & 50. The “wiper” of the pot connects to the inverting input of
IC25a. During factory set-up, the over pressure alignment is trimmed by selecting IC13 and incrementing its
output up or down. After alignment is complete, jumper LK1 is removed, thus preventing chip select of the
digital pot.

The output of IC25b applies an offset to the Adult/Neonate threshold input of IC15a. The output of IC15a,
labeled UNFIL_OVP, is normally at a high logic level but changes to low when overpressure occurs. This
signal is available as an input to the PSU board as unfiltered overpressure (UNFIL_OVP). UNFIL_OVP is
then filtered by R49 and C27 and fed in to comparator IC15b to produce filtered overpressure signal
FLT_OVP and is made available to the PSU board. The overpressure threshold voltage reference is

22

buffered by IC12 to produce TH_VREF which can be measured by the system processor via multiplexer
IC20 and ADC IC23.

Upon clearance of the overpressure condition the Main Board system processor can reset the overpressure
latch in GAL IC1 on the PSU Board, by asserting PNEU_RESET signal high, in order that another
determination can be carried out.

2.4.5 SpO2 System (TS & S models only)

Blood oxygen saturation and pulse determinations can be made (DINAMAP™ Compact TS and S only)
using a Nellcor Puritan Bennett™ finger sensor. This connects to the SpO2 module fitted inside a shielded
case mounted in the monitor. This module is supplied as a complete replaceable part, no service being
possible.

The SpO2 module communicates with the system processor via an isolated two wire serial interface. Data
signals from the system processor (SPO2_TX) are isolated by opto-coupler PC6. From here they enter
connector PL13 to the SpO2 module. Likewise, data transmitted from the SpO2 module are isolated by opto­coupler PC5, from where it is routed to the system processor as signal SPO2_RXD.

The SpO2 module (and the temperature determination circuit) is powered via an isolated power supply
module PM100. This is powered from the +12VV supply and generates the isolated +5VI, +9VI and -9VI
supplies (+5VI, +15VI and -15VI supplies on revision 04 units and earlier). On revision 06 units the isolated
power supply module is switched on by the system processor SPO2_PSU_ON signal, turning TR11 off and
setting the control input to ML3 high. On revision 04 and earlier units the isolated power supply module ML3
is turned on by grounding its -ve supply connection through FET TR12. In the event of a FAILSAFE
condition arising, the control signal of ML3 is set low by TR10 switching on (06 unit), or by switching TR12
off (on revision 04 units and earlier).

2.4.6 Power Supply

The power supplies are generated and controlled on the power supply board.
The power supply is designed to operate from both an external DC line source and from a 12-volt

rechargeable lead-acid battery. The supplied mains power converter provides 24 volt DC output. When both
supplies are present, the power supply will operate from the line supply if it is greater than 12 volts. If the
line supply is greater than 16 volts the battery will be charged both when the monitor is switched on and off.
The power supply sequencing functions are controlled by the PIC IC5.

Incoming line power from the external power converter has any high voltage spikes snubbed by transient
suppresser D4 and over-voltage protection is provided by D6, R10 and CSR1. Should the line input voltage
rise above 34 volts, zener diode D6 conducts, turning on thyristor CSR1. This causes a short circuit which
blows the external DC line fuse. Reverse polarity protection for the power supply is provided by blocking
diodes D8 and D29. A sample of the line input voltage is taken by R3 and R6 (DC_INPUT), and routed to
the external DC detection circuit IC16 and the PIC.

The switcher IC3, inductor L1 and diode D10 form a flyback converter with a nominal output of 15.1 volts
and VRAW of 14.8 volts through the battery blocking diode D11. A sample of the smoothed output is taken
by R29 & R30 to provide a feedback voltage.

The PIC uses the DC_BATTERY, DC_INPUT and EXT_DC_ON signals to determine the available power
sources. If valid power supply conditions exist and a battery is detected, the PIC will turn on TR7, which
turns on p-channel FET TR6, allowing the +15VI line to charge the battery via D9, R17 and FS1. When
charging is taking place, a voltage will appear across R17, which will be proportional to the charge current.
This voltage is sampled by R14 & R15 to produce the BATTERY_C signal.

23

If there is no valid external DC line supply applied to the monitor, the monitor will default to use the battery.
DC from the rechargeable battery arrives on thermal fuse FS1, from where it is routed to the source of TR2,
a p-channel FET under the control of TR3. The battery supplies power to VRAW via transistor TR2 and
diode D28. When operating from a battery, VRAW will be in the range 10.4 - 13.5 V depending on the
battery charge. A sample of the battery’s terminal voltage is taken by R1 & R2 and applied to the ADC input
of the PIC (DC_BATTERY). From this, the PIC can determine the charge state of the battery.

Diodes D24 and D25 provide a power supply line VDC_OP which is present whenever a supply is available.
This supply is used exclusively for IC16, a programmable voltage regulator with internal comparator. IC16
performs two functions. First, its internal comparator compares the sampled line input voltage DC_INPUT to
an internal reference level. When the DC_INPUT is below approximately 10.4 volts, IC16 turns off TR14 to
indicate to the PIC that there is no valid external DC input. The second function of IC16 is to generate a
precision voltage supply from VDC_OP, set by R5 & R9 to 4.5 volts. This voltage is connected to the
BATT_BACKUP line by D13, D23 preventing the voltage from entering the NiCd backup battery. This
battery, B1, has a nominal terminal voltage of 3.6 volts and is trickle charged form the +15.1 volt supply
when the system is powered.
The VRAW supply, which is nominally 14.8 volts when operating from an external line voltage or 10.4 to

13.6 volts when operating from battery, is used to generate the other power supply lines. The monitor’s
power on switch is routed directly to the PIC, which controls the set up sequencing of the power rails. The
PIC switches on the +5VD line then the +VDISP line, the 12-volt supplies are controlled by the system
processor which turns them on after the +5VD supply is stable.

VRAW enters IC7, a step down DC-to-DC converter, which is used to produce the +5VD digital line. The 5
volt logic supply IC7 is controlled by the PSU_INH signal from the PIC. VRAW also connects to IC17 to
produce the +4.5 volt LED display supply +VDISP, which is controlled by the PIC signal ENABLE_VDISP.

The 12 volt line and other supplies are controlled by the 12V_ON signal from the system processor on the
Main Board. When this pin is at a high logic level, TR9 is turned on, as is p-channel FET TR10. This causes
the VRAW supply to enter IC8, a boost-switching regulator. R41 & R42 set the output voltage of the flyback
converter to 14.5 volts, which is further regulated by linear regulator IC9 to produce the pump and valve
supply +12VV line and linear regulator IC18 to produce the analog supply +12VR line. The output of TR10
also feeds the inverting switching regulator IC10, which produces a -14 volt supply to linear regulator IC19
that in turn produces the analog supply -12VR line. A sample of the +12VV line is taken by R44 & R45,
producing the PUMP_V signal, while a sample is taken across +12VR and -12VR lines by R47 & R48
producing the ANALOG_V signal. These are measured by ADCs inside the PIC to confirm the operation of
the power supplies.

2.4.7 Audio Amplifier

User warning sounds are generated by the power supply board PIC as a pulse width modulated digital
signal AUDIO_FREQ. This signal is fed to all the inputs of the quad bilateral switch IC14, their outputs being
connected together via a resistor ladder to produce a switched gain-summing amplifier IC6. The gain
elements are operated by the PIC signal A_GAIN0-3, together providing a 4-bit (16 level) volume control.
The output of the summing amplifier IC6 also applies band-pass filtering to the audio signal. The circuit
around IC6b sets the upper breakpoint of the filter, while the circuit on the input to the final amplifier IC15
sets the lower breakpoint and provides amplification for the speaker.

2.4.8 Alarm and Communication Interfaces

The remote alarm signal originates from the system processor on the Main Board, from where it is logic
ORed with the FAILSAFE signal, inverted and sent as the REMOTE_ALARM signal to the power supply
board. The signal controls n-channel FET TR11 to drive the coil of the relay RL1/2. The switch side of the
relay contains both normally open and normally closed contacts, which are separated from the monitor
electronics via an isolation barrier. A dual pole dual throw relay is used, but its switch elements are
connected in parallel to provide a single pole dual throw action with increased current capacity.

24