Contec Medical Systems Co. ECG300GT User manual

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Preface
Please read the User Manual carefully before using this product. The operating
procedures specified in this User Manual should be followed strictly.This manual describes
in detail the operation steps which must be noted, the procedures which may result in
abnormality, and possible damage to the product or users. Refer to following chapters for details.
Failed to follow the User Manual may cause measuring abnormality, device damage or personal
injury. The manufacturer is NOT responsible for the safety, reliability and performance issues of
such results due to user’s negligence of this user manual for using, maintenance or storage. The
free service s and repairs do not cover such faults either.
The content in this user manual complies with real product. For software upgrade and some
modifications, the content in this user manual is subject to change without prior notice, and we
sincerely apologize for that.
Attentions
Before using this product, the safety and effectiveness described in the following shall
be considered:
Type of protection against electric shock: class I (AC power supply), internal powered
equipment (power supplied by battery)
Degree of protection against electric shock: type CF, defibrillation-proof applied part
Working mode: continuous running equipment
Enclosure protection class: IPX0
Measurement results shall be described by professional doctor combined with clinical
symptoms.
The using reliability depends on whether the operation guide and maintenance instructions
in this user manual is followed.
Service life: 5 years
Date of manufacture: see the label
Contraindications: none
Warning: To ensure the device safety and effectiveness, please use the company
recommended accessories. The maintenance and repair of the device should be done by
professional personal specified by the company. It is forbidden to refit the device.
Responsibility of the operator
The device must be operated by a professionally trained medical staff, and kept by a
special person.
The operator should read the User Manual carefully before use, and strictly follow the
operating procedure described in the User Manual.
The safety requirements have been fully considered in product designing, but the operator
can not ignore the observation of the patient and device.
The operator is responsible for providing the information of product use to the company.

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Responsibility of the company
The company supplies qualified products to user in accordance with enterprise standard.
The company installs and debugs the equipment and trains the physicians by contract.
The company performs device repair in warranty period (a year) and maintenance service
after warranty period.
The company responds timely to the user's request.
The user manual is written by Contec Medical Systems Co., Ltd. All rights reserved.

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Statement
Our company owns all rights to this unpublished work and intends to maintain it as
confidential information. This user manual is used only for reference of operation, maintenance,
or repair of our device. No part of this can be disseminated to others. And our company takes no
responsibilities for any consequences and liabilities caused by using this user manual for other
purposes.
This document contains proprietary information, which is protected by copyright. All rights
reserved. Photocopy, reproduction or translation of any part in the manual without our company's
written permission is prohibited.
All information contained in this user manual is believed to be correct. Our company shall
not be liable for incidental and consequential damages in connection with the furnishing,
performance, or use of this material. This user manual may refer to information and protected by
copyrights or patents and does not convey any license under the patent rights of our company,
nor the rights of others.Our company does not assume any liability for arising out of any
infringements of patents or other rights of the third parties.
Our company owns the final explanation right to this user manual, and reserves the right to
change the content of this user manual without prior notice, and the rights to change product
technology and specification.

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Contents
Chapter1 Overview.................................................................................................................. 1
1.1 Overview................................................................................................................. 1
1.2 Intended use.............................................................................................................1
1.3 Main technical specifications.................................................................................. 1
1.4 Main Characteristics................................................................................................2
1.5 Software overview...................................................................................................3
Chapter2 Safety Precautions....................................................................................................4
Chapter3 Warranty...................................................................................................................7
Chapter4 Working Principle and Structural Characteristics....................................................8
4.1 Working principle and its block diagram................................................................ 8
4.2 Name of each part and its function..........................................................................9
Chapter 5 Operation Precautions........................................................................................... 14
5.1 Precautions before use...........................................................................................14
5.2 Precautions during operating.................................................................................14
5.3 Precautions after use..............................................................................................14
Chapter 6 Preparations before Operation...............................................................................15
6.1 Installation of recording paper.............................................................................. 15
6.2 Power supply connection.......................................................................................16
6.3 Lead cable connection...........................................................................................16
6.4 Electrode installation.............................................................................................16
Chapter 7 Operation Instructions and Parameter Setting.......................................................19
7.1 Main Interface....................................................................................................... 19
7.2 Sampling interface.................................................................................................20
7.3 Case information input interface........................................................................... 22
7.4 Case management..................................................................................................23
7.5 Query.....................................................................................................................24
7.6 Review...................................................................................................................25
7.7 Date and time setup............................................................................................... 26
7.8 System setup..........................................................................................................27
7.9 Sampling setup...................................................................................................... 28

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7.10 Analysis parameters setup...................................................................................29
7.11 Print setup............................................................................................................29
7.12 Lead placement....................................................................................................31
7.13 About...................................................................................................................31
Chapter 8 Troubleshooting.................................................................................................... 32
8.1 Auto shutdown...................................................................................................... 32
8.2 AC interference..................................................................................................... 32
8.3 EMG interference..................................................................................................32
8.4 Baseline drift......................................................................................................... 33
8.5 Troubleshooting list...............................................................................................33
Chapter 9 Maintenance.......................................................................................................... 34
9.1 Battery................................................................................................................... 34
9.2 Recording paper.................................................................................................... 35
9.3 Maintenance after use............................................................................................35
9.4 Lead cables and electrodes....................................................................................36
9.5 Silicone rubber roller.............................................................................................36
9.6 Cleaning of thermal print head..............................................................................36
9.7 Disposal of product scrap......................................................................................36
9.8 Others.................................................................................................................... 36
Chapter 10 Packing List and Accessories..............................................................................38
10.1 Accompanying accessories..................................................................................38
10.2 Notes....................................................................................................................38
Appendix I ECG Automated Measurement&Interpretation Guide....................................... 39
1. Preface.....................................................................................................................39
2. Automated measurement parameters and Automated interpretation items.............39
3. Algorithm description..............................................................................................41
4. Data sources and data preprocessing.......................................................................51
5. Process and Result of Verification.......................................................................... 55
Appendix II EMC Guidance and Manufacturer Declaration.................................................64

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Chapter1 Overview
1.1 Overview
This product is a kind of electrocardiograph, which is able to sample 12 leads ECG signals
simultaneously and print out the ECG waveform with thermal printing system. Its functions are
as follows: recording and displaying ECG waveform in auto/manual mode; measuring ECG
waveform parameters automatically, and automatic analysis; pacing ECG detection; prompt for
electrode-off and out of paper; optional interface languages(Chinese/English, etc.); built-in
lithium battery, powered either by AC or DC; arbitrarily select the rhythm lead to conveniently
observe abnormal heart rate; case database management, etc.
1.2 Intended use
This product is suitable for hospital, scientific research, wards, ambulances and carrying out
medical consultations. It can be used by medical institutions to record human ECG signals,
collect and extract the ECG waveform.
1.3 Main technical specifications
1.3.1 Environment conditions
Operation:
a). Environment temperature: 5℃~40℃
b). Relative humidity: 25%~95%(no condensation)
c). Atmospheric pressure: 700 hPa~1060 hPa
d). Power supply:
Voltage: 100-240 V～
Frequency: 50 Hz, 60 Hz
Input power: ≤150 VA
Battery: 7.4 V, 3500 mAh rechargeable lithium battery
Transportation and Storage:
a). Environment temperature: -20 ℃～+55 ℃
b). Relative humidity: ≤95%
c). Atmospheric pressure: 500 hPa～1060 hPa
1.3.2 Input way: Floating and defibrillation protection
1.3.3 Lead: Standard 12 leads
1.3.4 Patient leakage current: <10µA
1.3.5 Input impedance: ≥2.5 MΩ
1.3.6 Frequency response:
Rated input
amplitude
Input frequency and waveform
Relative output response
1.0
0.67Hz~40Hz, Sine wave
±10%a
0.5
40Hz~100Hz, Sine wave
+10 %, -30 %a
0.25
100Hz~150Hz, Sine wave
+10 %, -30 %a

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0.5
150 Hz ~ 500 Hz, Sine wave
+10 %, -100 %a
1.5
≤1Hz,200ms, Triangle wave
+0 %, -10 %b
arelative to 10Hz brelative to 200 ms
1.3.7 Time constant: ≥3.2s
1.3.8 CMRR: >105 dB
1.3.9 Filter: power frequency(AC50/60 Hz), myoelectricity(25 Hz/35 Hz (-3 dB)), baseline drift
filter
1.3.10 Recording way: Thermal printing system
1.3.11 Specification of recording paper: 80 mm(W)×20 m(L) high-speed thermal paper
1.3.12 Time base selection(paper speed):
12.5 mm/s, 25 mm/s, 50 mm/s, error: ±5%
1.3.13 Gain control(sensitivity): 5,10, 20mm/mV, accuracy is ±2%; Standard sensitivity: 10
mm/mV±0.2 mm/mV
1.3.14 Auto record: record setup according to auto record format and mode, automatically
change leads, automatically measure and analyze.
1.3.15 Rhythm record: record setup according to rhythm record format and mode, automatically
measure and analyze.
1.3.16 Manual record: record according to manual record format.
1.3.17 Measurement parameters: HR, P-R interval, P Duration, QRS Duration, T Duration, Q-T
interval, Q-Tc, P Axis, QRS Axis, T Axis, R(V5) amplitude, S(V1) amplitude, R(V5)+S(V1)
amplitude
1.3.18 Product safety type: Class I type CF defibrillation-proof applied part
1.3.19 Polarization resistance voltage: ±610 mV
1.3.20 Noise level: ≤12 µVp-p
1.3.21 ECG signal input sampling frequency: 32 kHz
1.3.22 Waveform data processing sampling frequency: 1 kHz
1.3.23 Sampling precision: 24-bit
1.3.24 The minimum detection signal: 10 Hz, 20 µV(peak-peak value) deflected sinusoidal
signal can be detected
1.3.25 Pacing detection channel: standard II
1.3.26 Accuracy of input signal: ±5%.
1.3.27 Amplitude quantization: ≤5µV/LSB
1.3.28 Dimension: 315 mm(L)×215 mm(W)×77 mm(H)
1.3.29 Net Weight: 1.6 kg
1.3.30 Interchannel time deviation: <100 µs
1.4 Main Characteristics
1.4.1 High resolution thermal-array output system(8 dots/mm), no adjustment required.
Frequency Response is up to 150Hz.
1.4.2 Record clear and exact three channels ECG waveform and remarks in real-time and
continuously. The remark includes: lead sign, sensitivity, paper speed, filter state, etc.
1.4.3 In auto mode, recording can be completed with one-button operation, which improves work

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efficiency.
1.4.4 Under the best DC condition, the device can stand by for 10 hours, or print for at least 3
hours, or print 260 pieces ECG.
1.4.5 At least 1,000 pieces of medical records can be stored in the device, which facilitates
doctors to review and information statistics.
1.4.6 Beautiful and smooth appearance.
1.4.7 Degree of protection against ingress of liquid: IPX0
1.4.8 Use digital signal processing technology to conduct AC filter, baseline filter and EMG
filter on ECG signals, in order to get high-quality ECGs.
1.4.9 With auto-measurement, auto-analysis and auto-diagnosis functions of regular ECG
parameters, which reduces doctor’s workload and improves working efficiency.
1.4.10 With pacing ECG detection function.
1.5 Software overview
The ECG analysis program shows the results after analyzing the form of the
electrocardiogram, providing auxiliary reference for doctors to make diagnosis. The analysis
result cannot be used as the only standard for diagnosis. A comprehensive evaluation should be
made by professional electrocardiogram technicians and physicians according to clinical
experience and other test results.
The device is intended for use on all patient populations, which is decided by the clinical
doctor. The analysis program only provides ECG analysis for patients above 3 years old
(including 3 years).
Name of software: ECG300GT embedded software
Software specification: none
Software version: V1.9.10
Version naming rules: V<major version number>.<minor version number>.<revision version
number>
The version of the software can be obtained in “About”.
Involved algorithm:
Name: ECG algorithm
Type: mature algorithm
Use: to convert ECG signals of human body into intuitive waveform images and then analyzing.
Clinical function: Electrocardiogram is an important method for clinical diagnosis of
cardiovascular disease. How to use computer to quickly, automatically and accurately analyze
ECG has been a hot topic for scholars at home and abroad. The ECG algorithm is the key to the
analysis and diagnosis of ECG signals, and its accuracy and reliability determine the
effectiveness of diagnosis and treatment of patients with heart disease.

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Chapter2 Safety Precautions
2.1 Ensure that the device is placed on a flat level worktable. Avoid strong vibration or impact
when moving it.
2.2 When working with AC power, the power cord must be 3-core, the frequency and voltage
value of the AC power source must match the identification on the manual and have sufficient
capacity. When the provided three-core power cord cannot be used, please use the built-in DC
power supply or replace the three-core power cord that meets the standard requirements.
2.3 A perfect power supply system and grounding are necessary in the room.
2.4 If there are any questions for the integrality of protective grounding cable or the reliability of
protective grounding cable connection can not be guaranteed, the device must be run with
built-in DC power supply.
2.5 The safety requirements have been fully considered in product designing, but the operator
can not ignore the observation of the patient and device. Cut off the power or take off the
electrode when necessary to ensure patient's safety.
2.6 Please turn off the device and unplug the power cord before replacing the fuse or cleaning
and disinfection. Don't rub the screen with sharp materials.
2.7 Keep the device from water, don't use or store it in places with high air pressure, humidity or
temperature over the standard, bad ventilation, or too much dust.
2.8 Do not use the device in the place with flammable anesthetic gases or other flammable
chemicals, otherwise there is a danger of explosion or fire.
2.9 Do not use the device in medical hyperbaric oxygen chamber, otherwise there is a danger of
explosion or fire.
2.10 This device is not intended to act directly on the human heart. If this device is used with
cardiac defibrillator or other electric stimulating devices at the same time, single-use electrodes
and ECG lead cables with defibrillation-proof function should be selected. It is better not to use
this device with other electric stimulating devices at the same time. If it is necessary, there must
be professional technician guiding on the scene, and the selected accessories should be
designated by our company.
2.11 When the electrocardiograph is used together with a high-frequency electrosurgical knife,
the ECG electrode should be kept away from the contact of the electrosurgical knife to prevent
burns and burning of the electrode wires caused by high-frequency sparks.
2.12 When the electrocardiograph is used together with a defibrillator, the operator should avoid
contact with the patient or the sickbed. The defibrillation electrode should not directly touch the
ECG electrode to prevent sparks from burning the device and the patient.
2.13 Please do not use the electrocardiograph in the environment that is interfered by high-power
device such as high-voltage cables, X-rays, ultrasonic machines and electrizer, keep the device
away from emission sources such as mobile phones.
2.14 If other equipment is connected with this ECG device, it must be a Class I device that
complies with IEC60601-1. Because the total leakage current may hurt patient, the monitoring of

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leakage current is carried out and taken charge by the connected equipment.
2.15 Notes related to EMC
The device complies with the safety standards for medical electrical equipment or system
electromagnetic compatibility in IEC60601-1-2. Electromagnetic environments exceeding the
IEC60601-1-2 standard may cause harmful interference to the device or prevent the device from
performing its intended function or degrade its performance. Therefore, if there is a phenomenon
that does not match its function during use, be sure to confirm and eliminate adverse effects
before continuing to use it. Corresponding precautions for this situation are given in this manual.
The device or system should not be used near or stacked with other devices. If it must be
used near or stacked with other devices, it should be observed and verified that the device
is working normally under the configuration it is using.
The use of ACCESSORIES other than those specified by the MANUFACTURER of the
device or system, may result in increased EMISSIONS or decreased IMMUNITY of the
ME EQUIPMENT or ME SYSTEM.
Effect from radiated electromagnetic waves:
The use of a mobile phone may affect the operation of the device. When installing medical
electrical equipment, be sure to remind people around the device to turn off mobile phones and
small radios.
Effect from shock and conduction electromagnetic waves:
High frequency noise from other equipment can enter the device through the AC socket.
Please identify the source of noise, if possible, stop using the equipment. If the equipment can
not be deactivated, use noise cancellation equipment or take other measures to reduce the
impact.
Effect from static electricity:
Static electricity in a dry environment(indoor) may affect the operation of the device,
especially in winter. Before using the device, humidify the indoor air or discharge the static
electricity from the cable and operator.
Effect from thunder and lightning:
If there is thunder and lightning nearby, it may cause a voltage surge in the device. If you
are concerned about danger, disconnect the AC power and use the internal power supply.
2.16 Notes concerning ECG waveform measurement and analysis
2.16.1 The identification of P wave and Q wave is not always reliable with intensive EMG or AC
interference. Neither are the ST segment and T wave with baseline drift.
2.16.2 Winding and unclear end position of S wave and T wave may cause error in measurement.
2.16.3 When R wave is uninspected caused by some leads off or QRS wave low voltage, the
heart rate measurement may deviate greatly from the correct.
2.16.4 In case of QRS low voltage, ECG axis calculation and border-point identify of QRS wave
are not always reliable.
2.16.5 Occasionally, frequent ventricular premature complexes may be identified as dominant
beat.
2.16.6 Merging of versatile arrhythmia may result in unreliable measurement because of the
difficulty in distinguishing P wave in such situation.

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2.16.7 The device has an automatic analysis function that automatically analyzes the obtained
ECG waveform without reflecting all the patient’s status. The results of the analysis may
sometimes not comply with the doctor’s diagnosis. Therefore, the final conclusion needs to be
comprehensively analyzed by doctors in combination with analysis results, patient clinical
characterization and other test results.

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Chapter3 Warranty
3.1 In normal use, under strict observance of user manual and operation notes, in case of failure,
please contact with our customer service department. Our company has the sales record and
customer archives for each device. The customer has one year free warranty service from the
date of shipping according to the following conditions. To supply all-around and quick
maintenance service for you, please mail the maintenance card to us in time.
3.2 Our company may adopt such ways as guidance, express to company or door-to-door service,
etc. to carry out warranty promise.
3.3 Even in warranty period, the following repairs are charged.
3.3.1 Faults or injuries caused by misuse that not according to user manual and operation notes.
3.3.2 Faults or injuries caused by dropping accidentally after purchase.
3.3.3 Faults or injuries caused by repair, reconstruction, decomposition, etc. not by our company.
3.3.4 Faults or injuries caused by improper storage or force majeure after purchase.
3.3.5 Faults or injuries caused by using improper thermal recording paper.
3.4 The warranty period for accessories and fray parts is half a year. Power cable, recording
paper, operation manual and packing material are excluded.
3.5 Our company is not responsible for the faults of other connected devices caused by the faults
of this device directly or indirectly.
3.6 The warranty will be canceled if we find the protection label has been destroyed.
3.7 For charged maintenance beyond warranty period, our company advises to continue using
"Maintenance contract regulation". Please refer to our customer service department for details.

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Chapter4 Working Principle and Structural Characteristics
4.1 Working principle and its block diagram
4.1.1 The power supply unit
Principle of power supply
After the AC power supply enters the switching power supply, it is converted to DC voltage
and supplied to the DC-DC power unit, it also provides constant voltage current limiting
charging for the rechargeable lithium battery in the device through the DC-DC circuit, and
generates +5V and +8.5V voltage through the power conversion to supply power to the
corresponding modules. At the same time, the lithium battery in the device can independently
satisfy working requirements of each module in the device through the buck-boost circuit.
Note: The principle block diagram and component list are only available to service
stations or maintenance personnel designated by our company.
4.1.2 Signal acquisition unit
The signal acquisition unit uses a floating setting, which is a signal acquisition and
processing system, including analog circuit part and A/D conversion (with sampling accuracy of
24 bits) and data processing part. The analog circuit consists of signal following, amplification,
anti-aliasing low-pass filtering, lead-off detection and overload detection. CPU system is
responsible for coordinating the work of each circuit such as the A/D converter, the lead-off
detection circuit and the overload detection circuit, in order to achieve signal acquisition,
processing, and lead-off detection. Control information and A/D conversion and data acquisition
between the floating circuit and the solid circuit are transmitted through the optoelectronic
coupler.
4.1.3 Control unit
（1）Principle of control unit
The control system consists of printing system, button system, liquid crystal display system,
and signal acquisition system. The ECG signal sent from the signal acquisition system through
the high-speed optoelectronic coupler is received by the CPU system, after digital filtering, gain
adjustment and motor drive, it is sent to the printing system to print the ECG waveform. After
the printing is completed, the CPU system processes waveform measurement and analysis. The
CPU system also receives an interrupt signal and button code from the button system to complete
the interrupt processing. In addition, the lead-off signal, paper out detection, battery voltage
management, and automatic power-off are also managed by the CPU system. The liquid crystal
controller receives data and commands from the CPU system to complete the display of the
control state of the device.

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（2）Principle block diagram is shown in Figure 4-1.
Figure 4-1 Block diagram of control unit
4.2 Name of each part and its function
4.2.1 Front view
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1
3
Figure 4-2 Front view
1. Paper compartment cover
Keep the paper compartment closed, hold the printing paper
2. Display screen
Display patient’s ECG and related information
3. Button area
Control the operations of the device, and enter information.
4. Cover switch
To open or close the paper compartment cover.
Note
Do not put heavy objects on the screen or hit against it, otherwise the screen will be
damaged.
If the device is not in use, cover it to prevent liquid spills on the screen.
Do not use sharp stuff to operate the buttons, otherwise it may case permanent
damage to the buttons.

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4.2.2 Side view
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Figure 4-3 Side view
5. Lead cable interface
Connect with lead cables.
6. USB interface
Communicate with the computer. The ECG data and analysis result can be transmitted to a
computer, by using the computer, many functions can be achieved, such as archiving, managing,
and analyzing ECG data, which facilitates clinical research, organization teaching and training,
as well as program upgrade, case import and export, and connection with external printer.
Note
1. Lead cables must be disconnected from patient before connecting with a computer via
the USB interface.
2. Operator must not touch the USB interface and patient at the same time.
4.2.3 Rear view
Figure 4-4 Rear view
7. Equipotential terminal
Connect with the potential equalization conductor.
8. Input socket
Connect with AC power cord.
4.2.4 Buttons
Figure 4-5 Schematic diagram of buttons

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1. Startup indicator
It lights in green after turning on the device.
2. Power status indicator
Green indicates that the AC power supply is used. At this time, there is no battery in the device
or the battery is full. Red and green two colors indicate that the battery is being charged.
3. MENU
Menu button
4. MODE
When the device in sampling interface, use MODE button to select the print mode.
5. 1mV
Calibration button
6. PRINT
Print the sampled ECG waveform or end the printing.
7. Direction button
Up button
8. Direction button
Right button
9. SET
System menu and confirm.
10. Direction button
Down button
11. Direction button
Left button
12. FILTER
Set the filter mode.
13. SPEED
Change the ECG recording speed
14. SEN
Adjust the sensitivity manually.
15. ON/OFF
When the device is turned on, short press this button, it will prompt whether to shut down the
device, long press this button to turn off the device.
4.2.5 Symbols
～AC
Alternating current
Equipotential point, the equipotential point of this device is
combined with the protective grounding.
Caution! Refer to the accompanying document.
Type CF applied part, with defibrillation-proof function

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USB interface
PATIENT
Lead cable socket
Serial number
Manufacturer
Date of manufacture
Batch code
Latex free
Atmospheric pressure limitation
Temperature limitation
Humidity limitation
This way up
Fragile, handle with care
Keep away from rain
Stacking limit by number
General warning label
NOTE:
Background col our:yellow
Triangular band:Black
This item is compliant with Medical Device Directive
93/42EEC of June 14,1993, a directive of the European
Economic Community
Refer to instruction manual/booklet
Catalogue number

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Authorized representative in the European Community
Waste disposal symbol. This symbol indicates that electrical
and electronic equipment waste cannot be disposed of as
unsorted municipal waste and must be recycled separately.

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Chapter 5 Operation Precautions
5.1 Precautions before use
5.1.1 For safe and effective use, please read the user manual carefully before operation.
5.1.2 Check to ensure that the device is in good condition.
5.1.3 The device shall be placed on a flat surface, and moves gently to avoid strong vibration or
shock.
5.1.4 Check to ensure that the lead cables are correctly connected, and the device grounding is
correct.
5.1.5 The AC frequency and voltage should comply with the requirements, and enough current
capacity should be guaranteed.
5.1.6 When using the battery for power supply, check to ensure that the battery voltage and
battery status are in good condition, and the battery has enough power.
5.1.7 When the device is used together with other equipment, all devices and equipment should
be equipotential grounded in order to protect the user and operator.
5.1.8 Install the device where easily grounded in the room. Do not allow the patient and
patient-connected lead cables and electrodes to come into contact with other conductor parts,
including the earth or a hospital bed.
5.1.9 Clean the lead cable with neutral solvent. Do not use alcohol-based cleaners or gemicides.
5.1.10 Ensure that the device is running within the normal ambient temperature range of 5℃to
40℃. If the device is stored at a higher or lower temperature, leave it in the operating
environment for approximately 10 minutes before use in order to ensure the normal work.
5.2 Precautions during operating
5.2.1 The printing can be started after the ECG waveform is stable.
5.2.2 During using, the doctor should observe the patient carefully and cannot leave the
operating site. If necessary, turn off the power or remove the electrode to ensure patient safety.
5.2.3 The patient and the device can only be connected via lead cables through the electrodes, in
order to avoid patient touches other parts of device or conductors.
5.2.4 Patient can not move during operating.
5.2.5 Maintenance or repair to the device or accessory is not allowed during using.
5.3 Precautions after use
5.3.1 Set the states of all functions to initial states.
5.3.2 Cut off the power, gently remove the electrodes and limb clips, then remove the lead cables,
do not pull with force.
5.3.3 Clean the device and all accessories, and store them for the next use.

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Chapter 6 Preparations before Operation
6.1 Installation of recording paper
6.1.1 The device adopts high-speed recording paper, its specification is 80 mm(W)×20 m(L).
6.1.2 The installation method of recording paper is described as below:
1. As shown in Figure 6-1, open the paper cabinet cover, take out the paper axis, insert it into the
roll paper as shown in the figure. The paper side with grids should be faced downwards, and then
install it to proper position in the paper cabinet.
Figure 6-1 Installation of recording paper
2. Close the paper cabinet cover, it would be better to leave 2cm paper outside the exit of paper
cabinet.
Note
The recording paper should be aligned with the slot of the paper cabinet cover. It is
recommended to leave 2cm paper outside.
6.1.3 If the recording paper runs out during recording, the device will stop printing automatically,
and the screen will display a prompt of lack of paper, as shown in Figure 6-2.
Figure 6-2 Lack of paper prompt