Welch Allyn Schiller AT-2plus User manual

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AT-2plus
6-Channel Electrocardiograph
AT-2plus
6-Channel Electrocardiograph
Cardio Menu
Service Manual

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AT-2plus User Guide
Article Number 2. 510 274e
Associated Documents
Physician`s Guide to the Interpretation and Measurement Program
Article Number 2. 510 179
Welch Allyn Inc.
7420 Carroll Road
San Diego, CA 92121
Phone: [phone]
Fax: [phone]
www.welchallyn.com
United Kingdom: Canada:
Welch Allyn UK Ltd Welch Allyn Canada Ltd
Cubblington Road 160 Matheson Blvd. East, Unit #2
Aston Abbotts HP22 4ND Mississauga, Ontario L4Z 1V4
United Kingdom Canada
Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
Copyright © `97 & `98 by Welch Allyn Schiller
AT-2plus User Guide
Article Number 2. 510 274e
Associated Documents
Physician`s Guide to the Interpretation and Measurement Program
Article Number 2. 510 179
Welch Allyn Inc.
7420 Carroll Road
San Diego, CA 92121
Phone: [phone]
Fax: [phone]
www.welchallyn.com
United Kingdom: Canada:
Welch Allyn UK Ltd Welch Allyn Canada Ltd
Cubblington Road 160 Matheson Blvd. East, Unit #2
Aston Abbotts HP22 4ND Mississauga, Ontario L4Z 1V4
United Kingdom Canada
Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
Copyright © `97 & `98 by Welch Allyn Schiller

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DECLARATION OFCONFORMITY
Electrocardiograph: CardiovitAT - 2 Plus
Serial numbers starting with: 025.
Years of manufacturing: 1996 onwards
We, the undersigned,hereby declare that the medical device (classe II a) specified above conforms with the Essential Require-
ments listed in Annex I, of EC Directive 93/42/EEC
This declaration is supported by:
Certificate of approval No:
11425-02 ISO 9001 / EN 46001 by SQS valid date 17. January 2001
45112-60-01 ISO 9001/ 07.94, EN 46001 / 08.96 by DEKRA valid date 30.04.2003
and
45112-16-01 Annex II, Section 3 of the Directive 93/42/EEC, valid date 30.01.2003
Baar (Switzerland) 12.03.1998
JJ Schmid Markus Bütler
Research & Development Manager Quality Assurance Manager
DECLARATION OFCONFORMITY
Electrocardiograph: CardiovitAT - 2 Plus
Serial numbers starting with: 025.
Years of manufacturing: 1996 onwards
We, the undersigned,hereby declare that the medical device (classe II a) specified above conforms with the Essential Require-
ments listed in Annex I, of EC Directive 93/42/EEC
This declaration is supported by:
Certificate of approval No:
11425-02 ISO 9001 / EN 46001 by SQS valid date 17. January 2001
45112-60-01 ISO 9001/ 07.94, EN 46001 / 08.96 by DEKRA valid date 30.04.2003
and
45112-16-01 Annex II, Section 3 of the Directive 93/42/EEC, valid date 30.01.2003
Baar (Switzerland) 12.03.1998
JJ Schmid Markus Bütler
Research & Development Manager Quality Assurance Manager

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Disclaimer
The Information in this guide has been carefully checked for reliability; however no guarantee is given as to the correctness of the
contents and WELCH ALLYN SCHILLER makes no representations or warranties regarding the contents of this manual. We reserve
the right to revise this document and make changes in the specification of the product described within at any time without obligation to
notify any person of such revision or change.
Trademarks
WELCHALLYNSCHILLER andAT-2plusare registeredtrademarksof WELCHALLYN SCHILLER. Alltrademarksare theproperty
of their owners.
Copyright Notice
© Copyright 1996 and 1998 by WELCH ALLYN SCHILLER. All rights reserved. You may not reproduce, transmit, transcribe, store
in a retrieval system or translate into any language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual or otherwise, any part of this publication without express written permission of WELCH ALLYN SCHILLER.
Terms of Warranty
WELCHALLYN SCHILLER warrants the AT-2plus Electrocardiograph, when new, to be free of defects in material and workmanship
and to perform in accordance with manufacturer`s specifications for the period of three (3) years from the date of purchase from Welch
Allyn or it`s authorized distributors or agents. Accessory items such as electrodes, batteries and cables are limited to a warranty of 90
days from the date of purchase from Welch Allyn or its authorized distributors or agents. Welch Allyn will repair or replace any
components found to be defective or at variance from manufacturer`s specifications within this time at no cost to the customer. It shall
be the purchasers responsibility to return the instrument to Welch Allyn or an authorized distributer, agent or service representative.
This warranty does not include breakage or failure due to tampering, misuse, neglect, accidents, modifications or shipping. This warranty
is also void if the instrument is not used in accordance with manufacturer`s recommendations or if repaired by other than WelchAllyn
or an authorized agent. Purchase date determines warranty requirements. No other express warranty is given.
Disclaimer
The Information in this guide has been carefully checked for reliability; however no guarantee is given as to the correctness of the
contents and WELCH ALLYN SCHILLER makes no representations or warranties regarding the contents of this manual. We reserve
the right to revise this document and make changes in the specification of the product described within at any time without obligation to
notify any person of such revision or change.
Trademarks
WELCHALLYNSCHILLER andAT-2plusareregisteredtrademarks ofWELCH ALLYN SCHILLER.All trademarks aretheproperty
of their owners.
Copyright Notice
© Copyright 1996 and 1998 by WELCH ALLYN SCHILLER. All rights reserved. You may not reproduce, transmit, transcribe, store
in a retrieval system or translate into any language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual or otherwise, any part of this publication without express written permission of WELCH ALLYN SCHILLER.
Terms of Warranty
WELCHALLYN SCHILLER warrants the AT-2plus Electrocardiograph, when new, to be free of defects in material and workmanship
and to perform in accordance with manufacturer`s specifications for the period of three (3) years from the date of purchase from Welch
Allyn or it`s authorized distributors or agents. Accessory items such as electrodes, batteries and cables are limited to a warranty of 90
days from the date of purchase from Welch Allyn or its authorized distributors or agents. Welch Allyn will repair or replace any
components found to be defective or at variance from manufacturer`s specifications within this time at no cost to the customer. It shall
be the purchasers responsibility to return the instrument to Welch Allyn or an authorized distributer, agent or service representative.
This warranty does not include breakage or failure due to tampering, misuse, neglect, accidents, modifications or shipping. This warranty
is also void if the instrument is not used in accordance with manufacturer`s recommendations or if repaired by other than WelchAllyn
or an authorized agent. Purchase date determines warranty requirements. No other express warranty is given.

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PHYSICIAN‘S RESPONSIBILITY
THEAT-2PLUS ELECTROCARDIOGRAPH IS PROVIDED FORTHE EXCLUSIVE USE
OF QUALIFIED PHYSICIANS OR PERSONNEL UNDER THEIR DIRECT
SUPERVISION. THE NUMERICALAND GRAPHICALRESULTS FROMARECORDING
MUST BE EXAMINED WITH RESPECT TO THE PATIENTS OVERALL CLINICAL
CONDITION. THE RECORDING PREPARATION QUALITY AND THE GENERAL
RECORDED DATAQUALITY, WHICH COULD EFFECT THE REPORTDATA
ACCURACY, MUST ALSO BE TAKEN INTO ACCOUNT.
IT ISTHEPHYSICIANS RESPONSIBILITYTO MAKETHE DIAGNOSIS ORTO OBTAIN
EXPERTOPINION ON THE RESULTS, AND TO INSTITUTE CORRECT TREATMENT
IF INDICATED.
FEDERAL LAWIN THE USA RESTRICTS THIS DEVICE TO SALE BY OR ON THE
ORDER OF A PHYSICIAN
PHYSICIAN‘S RESPONSIBILITY
THEAT-2PLUS ELECTROCARDIOGRAPH IS PROVIDED FORTHE EXCLUSIVE USE
OF QUALIFIED PHYSICIANS OR PERSONNEL UNDER THEIR DIRECT
SUPERVISION. THE NUMERICALAND GRAPHICALRESULTS FROMARECORDING
MUST BE EXAMINED WITH RESPECT TO THE PATIENTS OVERALL CLINICAL
CONDITION. THE RECORDING PREPARATION QUALITY AND THE GENERAL
RECORDED DATAQUALITY, WHICH COULD EFFECT THE REPORTDATA
ACCURACY, MUST ALSO BE TAKEN INTO ACCOUNT.
IT ISTHEPHYSICIANS RESPONSIBILITYTO MAKETHE DIAGNOSIS ORTO OBTAIN
EXPERTOPINION ON THE RESULTS, AND TO INSTITUTE CORRECT TREATMENT
IF INDICATED.
FEDERAL LAWIN THE USA RESTRICTS THIS DEVICE TO SALE BY OR ON THE
ORDER OF A PHYSICIAN

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Safety Notices
TO PREVENT ELECTRIC SHOCK DO NOT DISASSEMBLE THE UNIT. NO SERVICEABLE PARTS INSIDE. REFER SERVICING TO
QUALIFIED PERSONNEL ONLY.
DO NOT USE THIS UNIT IN AREAS WHERE THERE IS ANY DANGER OF EXPLOSION OR THE PRESENCE OF FLAMMABLE
GASES SUCH AS ANAESTHETIC AGENTS.
THIS PRODUCT IS NOT DESIGNED FOR STERILE USE.
THIS PRODUCT IS NOT DESIGNED FOR OUTDOOR USE.
SWITCH THE UNIT OFF BEFORE CLEANING AND DISCONNECT FROM THE MAINS.
DO NOT, UNDER ANY CIRCUMSTANCES, IMMERSE THE UNIT OR CABLE ASSEMBLIES IN LIQUID.
THE DEVICE MUST ONLY BE OPERATED USING BATTERY POWER IF THE EARTH CONNECTION IS SUSPECT OR IF THE
MAINS LEAD IS DAMAGED OR SUSPECTED OF BEING DAMAGED.
DO NOT USE HIGH TEMPERATURE STERILISATION PROCESSES (SUCHAS AUTOCLAVING). DO NOT USE E-BEAM OR GAMMA
RADIATION STERILISATION.
DO NOT USE SOLVENT CLEANERS
USE ONLY ACCESSORIES AND OTHER PARTS RECOMMENDED OR SUPPLIED BY WELCH ALLYN SCHILLER. USE OF OTHER
THAN RECOMMENDED OR SUPPLIED PARTS MAY RESULTIN INJURY INACCURATE INFORMATION AND/ OR DAMAGE TO
THE UNIT.
Safety Notices
TO PREVENT ELECTRIC SHOCK DO NOT DISASSEMBLE THE UNIT. NO SERVICEABLE PARTS INSIDE. REFER SERVICING TO
QUALIFIED PERSONNEL ONLY.
DO NOT USE THIS UNIT IN AREAS WHERE THERE IS ANY DANGER OF EXPLOSION OR THE PRESENCE OF FLAMMABLE
GASES SUCH AS ANAESTHETIC AGENTS.
THIS PRODUCT IS NOT DESIGNED FOR STERILE USE.
THIS PRODUCT IS NOT DESIGNED FOR OUTDOOR USE.
SWITCH THE UNIT OFF BEFORE CLEANING AND DISCONNECT FROM THE MAINS.
DO NOT, UNDER ANY CIRCUMSTANCES, IMMERSE THE UNIT OR CABLE ASSEMBLIES IN LIQUID.
THE DEVICE MUST ONLY BE OPERATED USING BATTERY POWER IF THE EARTH CONNECTION IS SUSPECT OR IF THE
MAINS LEAD IS DAMAGED OR SUSPECTED OF BEING DAMAGED.
DO NOT USE HIGH TEMPERATURE STERILISATION PROCESSES (SUCHAS AUTOCLAVING). DO NOT USE E-BEAM OR GAMMA
RADIATION STERILISATION.
DO NOT USE SOLVENT CLEANERS
USE ONLY ACCESSORIES AND OTHER PARTS RECOMMENDED OR SUPPLIED BY WELCH ALLYN SCHILLER. USE OF OTHER
THAN RECOMMENDED OR SUPPLIED PARTS MAY RESULTIN INJURY INACCURATE INFORMATION AND/ OR DAMAGE TO
THE UNIT.

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THE AT-2PLUS COMPLIES WITH EMC REGULATIONS FOR MEDICAL PRODUCTS WHICH AFFORDS PROTECTION AGAINST
EMISSIONS AND ELECTRICAL INTERFERENCE. HOWEVER SPECIAL CARE MUST BE EXERCISED WHEN THE UNIT IS USED
WITH HIGH FREQUENCY EQUIPMENT.
ITMUST BE ENSURED THATNEITHER THE PATIENTNOR THE ELECTRODES (INCLUDING THE NEUTRAL ELECTRODE) COME
INTO CONTACT WITH OTHER PERSONS OR CONDUCTING OBJECTS (EVEN IF THESE ARE EARTHED).
THERE IS NO DANGER WHEN USING THE ECG UNIT FOR APACEMAKER PATIENT OR WITH SIMULTANEOUS USE OF
OTHER ELECTRICAL STIMULATION EQUIPMENT. HOWEVER, THE STIMULATION UNITS SHOULD ONLY BE USED ATA
SUFFICIENT DISTANCE FROM THE ELECTRODES. IN CASE OF DOUBT, THE PATIENT SHOULD BE DISCONNECTED FROM
THE RECORDER.
THIS UNIT IS CF CLASSIFIED ACCORDING TO IEC 601-1. THIS MEANS THATTHE PATIENT CONNECTION IS FULLY
ISOLATED AND DEFIBRILLATION PROTECTED. WELCH ALLYN SCHILLER CAN ONLY GUARANTEE PROTECTION
AGAINST DEFIBRILLATION VOLTAGE HOWEVER, WHEN THE ORIGINAL WELCH ALLYN SCHILLER PATIENT CABLE IS
USED.
IF SEVERAL UNITS ARE COUPLED THERE IS ADANGER OF SUMMATION OF LEAKAGE CURRENT
DO NOT TOUCH THE CASING DURING DEFIBRILLATION
IF THE PATIENT CABLE SHOULD BECOME DEFECTIVE AFTER DEFIBRILLATION, LEAD OFF WILL BE DISPLAYED AND
AN ACOUSTIC ALARM GIVEN
THE AT-2PLUS COMPLIES WITH EMC REGULATIONS FOR MEDICAL PRODUCTS WHICH AFFORDS PROTECTION AGAINST
EMISSIONS AND ELECTRICAL INTERFERENCE. HOWEVER SPECIAL CARE MUST BE EXERCISED WHEN THE UNIT IS USED
WITH HIGH FREQUENCY EQUIPMENT.
ITMUST BE ENSURED THATNEITHER THE PATIENTNOR THE ELECTRODES (INCLUDING THE NEUTRAL ELECTRODE) COME
INTO CONTACT WITH OTHER PERSONS OR CONDUCTING OBJECTS (EVEN IF THESE ARE EARTHED).
THERE IS NO DANGER WHEN USING THE ECG UNIT FOR APACEMAKER PATIENT OR WITH SIMULTANEOUS USE OF
OTHER ELECTRICAL STIMULATION EQUIPMENT. HOWEVER, THE STIMULATION UNITS SHOULD ONLY BE USED ATA
SUFFICIENT DISTANCE FROM THE ELECTRODES. IN CASE OF DOUBT, THE PATIENT SHOULD BE DISCONNECTED FROM
THE RECORDER.
THIS UNIT IS CF CLASSIFIED ACCORDING TO IEC 601-1. THIS MEANS THATTHE PATIENT CONNECTION IS FULLY
ISOLATED AND DEFIBRILLATION PROTECTED. WELCH ALLYN SCHILLER CAN ONLY GUARANTEE PROTECTION
AGAINST DEFIBRILLATION VOLTAGE HOWEVER, WHEN THE ORIGINAL WELCH ALLYN SCHILLER PATIENT CABLE IS
USED.
IF SEVERAL UNITS ARE COUPLED THERE IS ADANGER OF SUMMATION OF LEAKAGE CURRENT
DO NOT TOUCH THE CASING DURING DEFIBRILLATION
IF THE PATIENT CABLE SHOULD BECOME DEFECTIVE AFTER DEFIBRILLATION, LEAD OFF WILL BE DISPLAYED AND
AN ACOUSTIC ALARM GIVEN

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This equipment has been tested and found to comply with the limits for a class A digital device, pursuant to both Part
15 of the FCC (Federal Communications Commision) Rules and the radio interference regulations of the Canadian
DepartmentofCommunications.These limits are designed to provide reasonable protectionagainst harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with this instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.
DisposalInstructions
andBattery Care
ÆÊ
ÇÃ
°DO NOT DISPOSE OF THE BATTERYBY FIRE OR INCINERATOR -
DANGER OF EXPLOSION
°DO NOT ATTEMPT TO RECHARGE THE BATTERY- DANGER OF
EXPLOSION
°DO NOT OPEN THE BATTERYCASING - DANGER OF ACID BURN
Only dispose of the battery in official recycling centres or municipally approved
areas. Alternatively, used batteries can be returned to Welch Allyn Schiller for
disposal.
UnitDisposal Instructions
Units no longer required can be returned to Welch Allyn Schiller for disposal.
Alternatively, dispose of the unit in municipally approved recycling centres.
This equipment has been tested and found to comply with the limits for a class A digital device, pursuant to both Part
15 of the FCC (Federal Communications Commision) Rules and the radio interference regulations of the Canadian
DepartmentofCommunications.These limits are designed to provide reasonable protectionagainst harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with this instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.
DisposalInstructions
andBattery Care
ÆÊ
ÇÃ
°DO NOT DISPOSE OF THE BATTERYBY FIRE OR INCINERATOR -
DANGER OF EXPLOSION
°DO NOT ATTEMPT TO RECHARGE THE BATTERY- DANGER OF
EXPLOSION
°DO NOT OPEN THE BATTERYCASING - DANGER OF ACID BURN
Only dispose of the battery in official recycling centres or municipally approved
areas. Alternatively, used batteries can be returned to Welch Allyn Schiller for
disposal.
UnitDisposal Instructions
Units no longer required can be returned to Welch Allyn Schiller for disposal.
Alternatively, dispose of the unit in municipally approved recycling centres.

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Power Supply
The mains connection is on the rear of the unit.
The power supply voltage is set by the factory for100-115V(nom. 110V) or 220-240V
(nom. 230V) working. The setting is indicated by the indented metal strip on the fuse
panel. Contact your dealer if the voltage needs to be changed.
The mains indicator lamp on the keyboard is always lit when the unit is connected to the mains
supply. The unit can either be operated from the mains supply or from the built-in recharge-
able battery. The power source is indicted on the top line of the LCD.
Changing a Mains Fuse
If it is necessary to change a fuse, always replace with the correct rating i.e 2x200mAT
for230V,or 2x315mAT for 110V .
To change a fuse press the two retaining lugs on side of the fuse panel (situated below the mains
connectoron the backpanel.Remove the fusepaneland replace thefuse(s).Click back thefuse
panel.
Power Supply
The mains connection is on the rear of the unit.
The power supply voltage is set by the factory for100-115V(nom. 110V) or 220-240V
(nom. 230V) working. The setting is indicated by the indented metal strip on the fuse
panel. Contact your dealer if the voltage needs to be changed.
The mains indicator lamp on the keyboard is always lit when the unit is connected to the mains
supply. The unit can either be operated from the mains supply or from the built-in recharge-
able battery. The power source is indicted on the top line of the LCD.
Changing a Mains Fuse
If it is necessary to change a fuse, always replace with the correct rating i.e 2x200mAT
for230V,or 2x315mAT for 110V .
To change a fuse press the two retaining lugs on side of the fuse panel (situated below the mains
connectoron the backpanel.Remove the fusepaneland replace thefuse(s).Click back thefuse
panel.

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AT-2plusUser`sGuide
This User`s Guide gives instructions on how to operate the unit and provides an overview of all the basic
functions in an easy and simple to use format. The procedures are presented in a logical, step-by step way to
enable the user to quickly and easily familiarise themselves with unit operation. Detailed medical information is
excluded from this guide except where necessary to operate the unit or understand the results.
AT-2plusUser`sGuide
This User`s Guide gives instructions on how to operate the unit and provides an overview of all the basic
functions in an easy and simple to use format. The procedures are presented in a logical, step-by step way to
enable the user to quickly and easily familiarise themselves with unit operation. Detailed medical information is
excluded from this guide except where necessary to operate the unit or understand the results.

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AT-2plus 6-Channel ECG Unit - USER GUIDE
1
AT-2plus 6-Channel ECG Unit - USER GUIDE
Manual ECG Recording (Rhythm Strip)
•Prepare skin, hook up patient.
•Switch unit on, press ON ON .
•Press MAN START MAN
PRINT .
•Change lead group with 1and 2.
•Press STOP STOP to stop the printout.
Electrode hook-up check
•Press ALT 0
1mV 3
AUTO 3 AUTO for electrode check.
Best results are obtained when the electrode voltage readings
(right column) are between ±50mV.
Filter On/Off
•Press FILTER to switch the (Myogram) filter On / Off.
System Configuration
•Press ALT 0
1mV 11to print system settings.
Automatic ECG Recording
•Prepare skin, hook up patient.
•Switch unit on, press ON ON .
•Press PATIENT
DATA and enter patient data.
•Press PATIENT
DATA again and wait for at
least 10 seconds until a clear and stable trace is
displayed.
•Press AUTO AUTO PRINT to record and print.
•Press COPY COPY for additional copies.
AT-2plus - User Guide
Short Form Instructions
Manual ECG Recording (Rhythm Strip)
•Prepare skin, hook up patient.
•Switch unit on, press ON ON .
•Press MAN START MAN
PRINT .
•Change lead group with 1and 2.
•Press STOP STOP to stop the printout.
Electrode hook-up check
•Press ALT 0
1mV 3
AUTO 3 AUTO for electrode check.
Best results are obtained when the electrode voltage readings
(right column) are between ±50mV.
Filter On/Off
•Press FILTER to switch the (Myogram) filter On / Off.
System Configuration
•Press ALT 0
1mV 11to print system settings.
Automatic ECG Recording
•Prepare skin, hook up patient.
•Switch unit on, press ON ON .
•Press PATIENT
DATA and enter patient data.
•Press PATIENT
DATA again and wait for at
least 10 seconds until a clear and stable trace is
displayed.
•Press AUTO AUTO PRINT to record and print.
•Press COPY COPY for additional copies.
AT-2plus - User Guide
Short Form Instructions

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List of Symbols
93/42/EEC Medical Devices:
0124 `Notified Body` DEKRA AG
Battery operation
(Flashes when battery
capacity limited.
Mains connected
Potential Equalisation
(common ground)
Attention - General warning sign -
see accompanying documentation
Type CF equipment - safe for internal
applications. Note: The paddles indicate
that the equipment is defibrillator proof
♥
List of Symbols
93/42/EEC Medical Devices:
0124 `Notified Body` DEKRA AG
Battery operation
(Flashes when battery
capacity limited.
Mains connected
Potential Equalisation
(common ground)
Attention - General warning sign -
see accompanying documentation
Type CF equipment - safe for internal
applications. Note: The paddles indicate
that the equipment is defibrillator proof
♥

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AT-2plus 6-Channel ECG Unit - USER GUIDE
3
AT-2plus 6-Channel ECG Unit - USER GUIDE
Modes of Operation................................................. 4
Automatic Mode..................................................................4
Manual Mode ..................................................................... 4
Automatic Mode...................................................... 5
Manual Mode .......................................................... 6
Patient Cable Connections...................................... 8
Standard Leads .................................................................. 9
Location & Power ................................................... 10
Location .............................................................................10
Power Supply .....................................................................10
Switching On and Off .............................................. 11
Potential Equalisation .........................................................11
Keyboard ................................................................. 12
LCDScreen.............................................................. 14
Settings .................................................................... 15
DefaultSettings...................................................................17
Language - American and Standard English ......................18
User Identification ..............................................................18
Filters .................................................................................19
BaselineFilter ....................................................................19
Mains Filter ........................................................................19
Myogram Filter ..................................................................20
Defining Lead Sequence & Printout .................................... 21
Acoustic QRS Indication ..................................................... 22
Time / Date .........................................................................22
Automatic Mode (ECG) Settings..............................23
Average Cycles ...................................................................24
Measurements and Markings (i version only) ....................25
Interpretation (i version only).............................................26
Interpretation Settings (i version only)................................ 26
SelectingRhythm Leads ...................................................... 27
Memory and Data Transmission Option ..................28
Safety Notices ..................................................................... 28
Auto Storage and Auto Erase..............................................28
Manual Storage .................................................................. 29
Displaying Memory Files ...................................................29
Reading and Printing a Stored File ..................................... 29
ErasingMemory Files ........................................................ 29
Memory and Data Transmission Option ..................30
Transmitting Stored Files ...................................................30
Transmission Settings .........................................................30
Line Transmission ..............................................................31
Modem Transmission .........................................................31
Care & Maintenance ................................................33
Self-test ...............................................................................33
12 Monthly Check...............................................................33
Cleaning the Casing ...........................................................33
Cleaningthe Patient Cable..................................................34
Cleaning the Thermal Print Head .......................................34
Replacing the Recording Paper ...............................35
Thermal Paper Handling ...................................................36
Fault Diagnosis ........................................................37
Technical Data .........................................................39
Available Configurations .................................................... 41
Modes of Operation..................................................4
Automatic Mode..................................................................4
Manual Mode ..................................................................... 4
Automatic Mode.......................................................5
Manual Mode ...........................................................6
Patient Cable Connections.......................................8
Standard Leads .................................................................. 9
Location & Power ....................................................10
Location .............................................................................10
Power Supply ..................................................................... 10
Switching On and Off ...............................................11
Potential Equalisation .........................................................11
Keyboard ..................................................................12
LCDScreen...............................................................14
Settings .....................................................................15
DefaultSettings ..................................................................17
Language - American and Standard English ......................18
User Identification .............................................................. 18
Filters .................................................................................19
BaselineFilter ....................................................................19
Mains Filter ........................................................................ 19
Myogram Filter ..................................................................20
Defining Lead Sequence & Printout .................................... 21
Acoustic QRS Indication ..................................................... 22
Time / Date .........................................................................22
Automatic Mode (ECG) Settings............................. 23
Average Cycles ...................................................................24
Measurements and Markings (i version only) ....................25
Interpretation (i version only).............................................26
Interpretation Settings (i version only)................................ 26
SelectingRhythm Leads ......................................................27
Memory and Data Transmission Option ................. 28
Safety Notices .....................................................................28
Auto Storage and Auto Erase..............................................28
Manual Storage .................................................................. 29
Displaying Memory Files ...................................................29
Reading and Printing a Stored File .....................................29
ErasingMemory Files ........................................................29
Memory and Data Transmission Option ................. 30
Transmitting Stored Files ...................................................30
Transmission Settings .........................................................30
Line Transmission ..............................................................31
Modem Transmission .........................................................31
Care & Maintenance ............................................... 33
Self-test ...............................................................................33
12 Monthly Check...............................................................33
Cleaning the Casing ...........................................................33
Cleaningthe Patient Cable..................................................34
Cleaning the Thermal Print Head .......................................34
Replacing the Recording Paper .............................. 35
Thermal Paper Handling ...................................................36
Fault Diagnosis ....................................................... 37
Technical Data ........................................................ 39
Available Configurations .................................................... 41

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4
Modes of Operation
Automatic Mode
Automatic Mode provides a printout giving 10 seconds of ECG
recording of all 12 leads with a choice of 2 different formats.
The following can be programmed freely for each of the 2 formats
before recording:
•Lead Format
•Chart Speed
•With the optional interpretation program installed it is also
possible to select the measurement table, average cycles
with optional markings and interpretation statements for
the printout.
For further information see paragraph `Settings for Automatic
Mode`.
Manual Mode
Manual Mode provides a real time printout of 6 leads that are
selected and indicated on the screen.
The following can be freely selected before or during recording:
•Lead Group
•Chart Speed
•Sensitivity
•Myogram Filter
For further information see paragraph `ECG Recording in Manual
Mode` following.
Modes of Operation
Automatic Mode
Automatic Mode provides a printout giving 10 seconds of ECG
recording of all 12 leads with a choice of 2 different formats.
The following can be programmed freely for each of the 2 formats
before recording:
•Lead Format
•Chart Speed
•With the optional interpretation program installed it is also
possible to select the measurement table, average cycles
with optional markings and interpretation statements for
the printout.
For further information see paragraph `Settings for Automatic
Mode`.
Manual Mode
Manual Mode provides a real time printout of 6 leads that are
selected and indicated on the screen.
The following can be freely selected before or during recording:
•Lead Group
•Chart Speed
•Sensitivity
•Myogram Filter
For further information see paragraph `ECG Recording in Manual
Mode` following.

5
AT-2plus 6-Channel ECG Unit - USER GUIDE
5
AT-2plus 6-Channel ECG Unit - USER GUIDE
Automatic Mode
In automatic mode, a full 12-lead ECG is printed in one of two
predefined formats with a sensitivity of 10 mm/mV. These two
formats are selected by the user to suit his specific needs and
requirements.
When the AUTO SENSITIVITY key 3
AUTO
is pressed before
recording in automatic mode, the unit detects very large waveform
amplitudesand sets thesensitivity fortheextremity and/or precordial
leads to 5 mm/mV to reduce the overlapping of traces.An `A` on the
bottom line of the LCD indicates that Auto sensitivity is set.
To start the automatic ECG recording in
Format 1, press theAUTO key:
AUTO PRINT
To start the automatic recording in the
secondformat, presstheALT keyfollowed
by theAUTO key:
ALT +AUTO PRINT
The printout gives the following:
•ECG recording of all leads in either Standard or Cabrera
format according to selection
•Sensitivity
•Heart Rate
•Speed
•Filter Settings
•Time and Date
•Interpretation statements
•Average Cycles
•Intervals
•Axis
•Sokolow Index (ECG index for hypertrophy)
•Detailed Measurement Table
To obtain an extra printout of the ECG recording in
Format 1, simply press the COPY key
To obtain an extra printout of the second format, press theALT key
followed by the COPY key ALT + COPY
The Auto mode settings for the two formats are detailed in the
paragraph entitled `Settings for Automatic Mode` later in this book
COPY
Automatic Mode
In automatic mode, a full 12-lead ECG is printed in one of two
predefined formats with a sensitivity of 10 mm/mV. These two
formats are selected by the user to suit his specific needs and
requirements.
When the AUTO SENSITIVITY key 3
AUTO
is pressed before
recording in automatic mode, the unit detects very large waveform
amplitudesand sets thesensitivity fortheextremity and/or precordial
leads to 5 mm/mV to reduce the overlapping of traces. An `A` on the
bottom line of the LCD indicates that Auto sensitivity is set.
To start the automatic ECG recording in
Format1,press the AUTOkey:
AUTO PRINT
To start the automatic recording in the
secondformat, presstheALT keyfollowed
by the AUTO key:
ALT +AUTO PRINT
The printout gives the following:
•ECG recording of all leads in either Standard or Cabrera
format according to selection
•Sensitivity
•Heart Rate
•Speed
•Filter Settings
•Time and Date
•Interpretation statements
•Average Cycles
•Intervals
•Axis
•Sokolow Index (ECG index for hypertrophy)
•Detailed Measurement Table
To obtain an extra printout of the ECG recording in
Format 1, simply press the COPY key
To obtain an extra printout of the second format, press theALT key
followed by the COPY key ALT + COPY
The Auto mode settings for the two formats are detailed in the
paragraph entitled `Settings for Automatic Mode` later in this book
COPY

6
6
Manual Mode
Manual mode provides a direct printout of the real-time ECG with
full control of parameter selection.
Tostartthemanualrecordingof areal-time
ECG,pressthe MANUAL Printoutkey
MAN
PRINT
To stop the manual recording (printout)
press the STOP key
STOP
The printout provides you with the following:
•Six (selected) leads with lead identification.
•On the lower edge, the chart speed, user identification and
filter settings (if on).
•At the top, the heart rate as current average of 4 beats, trace
sensitivity, and the time and date
The following can be freely chosen during or before the recording:
LeadGroup by means of the LEAD FORWARD and LEAD
BACKWARD key
12
The following lead groups are selectable:
•I, II, III aVR,aVL, aVF
(Cabrera: aVL, I, -aVR / II, aVF, III)
•V1, V2, V3 /V4, V5, V6
•II, aVF, III /V2, V4, V5
•V4, V5, V6 / V7, V8, V9
Note: The LCD only displays three leads at one time. When the
leadforward or lead backwardkey ispressed, thefollowing
/preceding three lead group is displayed
Manual Mode
Manual mode provides a direct printout of the real-time ECG with
full control of parameter selection.
Tostartthemanualrecordingof areal-time
ECG,pressthe MANUAL Printoutkey
MAN
PRINT
To stop the manual recording (printout)
press the STOP key
STOP
The printout provides you with the following:
•Six (selected) leads with lead identification.
•On the lower edge, the chart speed, user identification and
filter settings (if on).
•At the top, the heart rate as current average of 4 beats, trace
sensitivity, and the time and date
The following can be freely chosen during or before the recording:
LeadGroup by means of the LEAD FORWARD and LEAD
BACKWARD key
12
The following lead groups are selectable:
•I, II, III aVR,aVL, aVF
(Cabrera: aVL, I, -aVR / II, aVF, III)
•V1, V2, V3 /V4, V5, V6
•II, aVF, III /V2, V4, V5
•V4, V5, V6 / V7, V8, V9
Note: The LCD only displays three leads at one time. When the
leadforward or lead backwardkey ispressed, thefollowing
/preceding three lead group is displayed

7
AT-2plus 6-Channel ECG Unit - USER GUIDE
7
AT-2plus 6-Channel ECG Unit - USER GUIDE
Manual Mode
Chart Speed Select speed 5, 10, 25 or 50mm/s by means of
the SPEED keys:
7
5/10 8
25 9 50
Notes: Key7isatogglekey-pressonceand5isselected,
press a second time and 10mm/s is selected.
When the 25 or 50mm/s key is pressed, the
same speed is set on both the screen and the
(manual) printout. When 5 or 10 mm/s is
selected, this affects the manual printout speed
only.
Sensitivity Select 5, 10 or 20 mm/mV by means of the
SENSITIVITY keys:
4
55 10 6 20
Myogram Filter Switch the filter ON or OFF with the FILTER
key:
FILTER
`FILTER` is displayed on the bottom line of the
LCD when the filter is switched on.
Recentering To re-centre the ECG traces, press the 1mV key
0
1mV
WARNING: AFTER HEAVY ARTEFACTS OR LEAD OFF, THE
INDICATION OF THE HEARTRATE MAY NOT
BE RELIABLE.
Manual Mode
Chart Speed Select speed 5, 10, 25 or 50mm/s by means of
the SPEED keys:
7
5/10 8
25 9 50
Notes: Key7isatogglekey-pressonceand5isselected,
press a second time and 10mm/s is selected.
When the 25 or 50mm/s key is pressed, the
same speed is set on both the screen and the
(manual) printout. When 5 or 10 mm/s is
selected, this affects the manual printout speed
only.
Sensitivity Select 5, 10 or 20 mm/mV by means of the
SENSITIVITY keys:
4
55 10 6 20
Myogram Filter Switch the filter ON or OFF with the FILTER
key:
FILTER
`FILTER` is displayed on the bottom line of the
LCD when the filter is switched on.
Recentering To re-centre the ECG traces, press the 1mV key
0
1mV
WARNING: AFTER HEAVY ARTEFACTS OR LEAD OFF, THE
INDICATION OF THE HEARTRATE MAY NOT
BE RELIABLE.

8
8
Patient Cable Connections
Theaccessory kit of theelectrocardiograph includesa 10-leadpatient
cable. This cable is plugged into the patient cable socket on the
right-hand side of the unit and secured with the two screws.
The AT-2plus is CF rated. The patient connection is fully isolated
and defibrillation protected. Protection against defibrillation voltage
ishoweveronlyensured, if the original WELCHALLYN SCHILLER
patient cable (Part-no. 80130-0000) is used. Make sure that during
ECG recording neither the patient nor the conducting parts of the
patientconnection or theelectrodes (includingtheneutral electrode)
come into contact with other persons or conducting objects (even if
these are earthed).
The quality of the ECG is dependent on the preparation and the
resistance between the skin and the electrode. To ensure a good
quality ECG and minimise the skin/electrode resistance, remember
the following points:
1. Ensurethatthepatientiswarmandrelaxed.
2. Shave electrode area before cleaning.
3. Thoroughlyclean theareawithalcohol.
4. Place the C4 electrode first - in the fifth
intercostal space on midclavicular line.
Thenplace:
•C1 in fourth intercostal space at the right
sternalborder
•C2 in fourth intercostal space at the left
sternalborder
•C3 between,and equidistantto, C4and C2
•C6onleftmidaxillarylineonthesamelevel
as C4
•C5 between,and equidistantto, C4and C6
Theelectrode placements shownon the following pageare labelled
withthe colors accordingto IECrequirements.The equivalent AHA
colors are given on the table opposite.
Patient Cable Connections
Theaccessory kit of theelectrocardiograph includesa 10-leadpatient
cable. This cable is plugged into the patient cable socket on the
right-hand side of the unit and secured with the two screws.
The AT-2plus is CF rated. The patient connection is fully isolated
and defibrillation protected. Protection against defibrillation voltage
ishoweveronlyensured, if the original WELCHALLYN SCHILLER
patient cable (Part-no. 80130-0000) is used. Make sure that during
ECG recording neither the patient nor the conducting parts of the
patientconnection or theelectrodes (includingtheneutral electrode)
come into contact with other persons or conducting objects (even if
these are earthed).
The quality of the ECG is dependent on the preparation and the
resistance between the skin and the electrode. To ensure a good
quality ECG and minimise the skin/electrode resistance, remember
the following points:
1. Ensurethatthepatientiswarmandrelaxed.
2. Shave electrode area before cleaning.
3. Thoroughlyclean theareawithalcohol.
4. Place the C4 electrode first - in the fifth
intercostal space on midclavicular line.
Thenplace:
•C1 in fourth intercostal space at the right
sternalborder
•C2 in fourth intercostal space at the left
sternalborder
•C3 between,and equidistantto, C4and C2
•C6onleftmidaxillarylineonthesamelevel
as C4
•C5 between,and equidistantto, C4and C6
Theelectrode placements shownon the following pageare labelled
withthe colors accordingto IECrequirements.The equivalent AHA
colors are given on the table opposite.

9
AT-2plus 6-Channel ECG Unit - USER GUIDE
9
AT-2plus 6-Channel ECG Unit - USER GUIDE
Standard Leads
Patient Cable Connections
IEC AHA
NBlack RL Green
RRed RA White
C1 White/Red V1 Brown/Red
C2 White/Yellow V2 Brown/Yellow
C3 White/Green V3 Brown/Green
C4 White/Brown V4 Brown/Blue
C5 White/Black V5 Brown/Orange
C6 White/Violet V6 Brown/Violet
LYellow LA Black
FGreen LL Red
Standard Leads
Patient Cable Connections
IEC AHA
NBlack RL Green
RRed RA White
C1 White/Red V1 Brown/Red
C2 White/Yellow V2 Brown/Yellow
C3 White/Green V3 Brown/Green
C4 White/Brown V4 Brown/Blue
C5 White/Black V5 Brown/Orange
C6 White/Violet V6 Brown/Violet
LYellow LA Black
FGreen LL Red

10
10
Location & Power
Location
Do not keep or operate the apparatus in a wet, moist, or dusty
environment. Also, avoid exposure to direct sunlight or heat from
other sources. Do not allow the unit to come into contact with acidic
vapours or liquids, as such contact may cause irreparable damage.
The unit should not be placed near X-ray or diathermy units, large
transformers or motors. The unit must be placed on a flat surface
and must not be operated in areas where there is any danger of
explosion.
Power Supply
The mains connection is on the rear of the unit. The mains indicator
lamp on the keyboard is always lit when the unit is connected to the
mains supply. The unit can either be operated from the mains supply
orfromthe built-in rechargeable battery. Thepower source isindicted
on the top line of the LCD.
R L F C1 C2
C3 C4 C5 C6
HR: 76/min Wed 20-AUG-96 18:20:21
Power Indication
When mains is connected a mains symbol is
displayed (as shown above). When the unit is
running on battery power a battery symbol is
displayed:
When battery capacity is limited, the battery
symbolflasheson andoff.
To recharge the battery, connect the apparatus to the mains supply
by means of the supplied power cable. A totally discharged battery
needs less than 15 hours to be fully recharged (60% in less than 3
hours, 90% in less than 7 hours). A fully charged battery gives
approximately4 hours ofnormal use.The unitcanremain connected
to the mains supply without any danger of damage to either the
battery or the unit.
Location & Power
Location
Do not keep or operate the apparatus in a wet, moist, or dusty
environment. Also, avoid exposure to direct sunlight or heat from
other sources. Do not allow the unit to come into contact with acidic
vapours or liquids, as such contact may cause irreparable damage.
The unit should not be placed near X-ray or diathermy units, large
transformers or motors. The unit must be placed on a flat surface
and must not be operated in areas where there is any danger of
explosion.
Power Supply
The mains connection is on the rear of the unit. The mains indicator
lamp on the keyboard is always lit when the unit is connected to the
mains supply. The unit can either be operated from the mains supply
orfromthe built-in rechargeable battery. Thepower source isindicted
on the top line of the LCD.
R L F C1 C2
C3 C4 C5 C6
HR: 76/min Wed 20-AUG-96 18:20:21
Power Indication
When mains is connected a mains symbol is
displayed (as shown above). When the unit is
running on battery power a battery symbol is
displayed:
When battery capacity is limited, the battery
symbolflasheson andoff.
To recharge the battery, connect the apparatus to the mains supply
by means of the supplied power cable. A totally discharged battery
needs less than 15 hours to be fully recharged (60% in less than 3
hours, 90% in less than 7 hours). A fully charged battery gives
approximately4 hours ofnormal use.The unitcanremain connected
to the mains supply without any danger of damage to either the
battery or the unit.