Welch Allyn AT-1 User manual

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AT-1
3-Channel Electrocardiograph
AT-1
3-Channel Electrocardiograph
Service Manual
Parts List
Cardio Menu

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AT-1 User Guide
Article Number 2. 510270b
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-1 User Guide
Article Number 2. 510270b
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: AT-1
Serial numbers starting with: 190.00100
Year of manufacture: 1995 Onwards
We, the undersigned, hereby declare that the medical device (class IIa) specified above conforms with the essential requirement
listed in Annex 1 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 30.04.2003
Baar (Switzerland) 06.05.1998
JJ Schmid Markus Bütler
Research & Development Manager Quality Assurance Manager
DECLARATION OFCONFORMITY
Electrocardiograph: AT-1
Serial numbers starting with: 190.00100
Year of manufacture: 1995 Onwards
We, the undersigned, hereby declare that the medical device (class IIa) specified above conforms with the essential requirement
listed in Annex 1 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 30.04.2003
Baar (Switzerland) 06.05.1998
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
WELCH ALLYN SCHILLER and AT-1 are registered trademarks of WELCH ALLYN SCHILLER. All trademarks are the property
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
WELCH ALLYN SCHILLER warrants the AT-1 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 Welch Ally 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
WELCH ALLYN SCHILLER and AT-1 are registered trademarks of WELCH ALLYN SCHILLER. All trademarks are the property
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
WELCH ALLYN SCHILLER warrants the AT-1 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 Welch Ally or an authorized agent. Purchase date determines warranty requirements. No other express warranty is
given.

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PHYSICIAN‘S RESPONSIBILITY
THE AT-1 ELECTROCARDIOGRAPH IS PROVIDED FOR THE EXCLUSIVE USE OF
QUALIFIED PHYSICIANS OR PERSONNEL UNDER THEIR DIRECT SUPERVISION.
THE NUMERICAL AND GRAPHICAL RESULTS FROM ARECORDING MUST BE
EXAMINED WITH RESPECT TO THE PATIENTS OVERALL CLINICAL CONDITION.
THE RECORDING PREPARATION QUALITY AND THE GENERAL RECORDED
DATAQUALITY, WHICH COULD EFFECT THE REPORTDATAACCURACY, MUST
ALSO BE TAKEN INTO ACCOUNT.
IT IS THE PHYSICIANS RESPONSIBILITY TO MAKE THE DIAGNOSIS OR TO
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 APHYSICIAN
PHYSICIAN‘S RESPONSIBILITY
THE AT-1 ELECTROCARDIOGRAPH IS PROVIDED FOR THE EXCLUSIVE USE OF
QUALIFIED PHYSICIANS OR PERSONNEL UNDER THEIR DIRECT SUPERVISION.
THE NUMERICAL AND GRAPHICAL RESULTS FROM ARECORDING MUST BE
EXAMINED WITH RESPECT TO THE PATIENTS OVERALL CLINICAL CONDITION.
THE RECORDING PREPARATION QUALITY AND THE GENERAL RECORDED
DATAQUALITY, WHICH COULD EFFECT THE REPORTDATAACCURACY, MUST
ALSO BE TAKEN INTO ACCOUNT.
IT IS THE PHYSICIANS RESPONSIBILITY TO MAKE THE DIAGNOSIS OR TO
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 APHYSICIAN

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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 (SUCH AS AUTOCLAVING). DO NOT USE E-BEAM OR
GAMMA RADIATION STERILISATION.
DO NOT USE SOLVENT CLEANERS
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 (SUCH AS AUTOCLAVING). DO NOT USE E-BEAM OR
GAMMA RADIATION STERILISATION.
DO NOT USE SOLVENT CLEANERS

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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.
THE AT-1 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.
IT MUST BE ENSURED THATNEITHER THE PATIENT NOR 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 AT
ASUFFICIENT 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 A DANGER 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
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.
THE AT-1 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.
IT MUST BE ENSURED THATNEITHER THE PATIENT NOR 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 AT
ASUFFICIENT 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 A DANGER 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
Department of Communications. These limits are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio
frequencyenergyand,if notinstalled andused inaccordance withthis instructionmanual, maycause harmfulinterference
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
andBatteryCare
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 Schiller AG for disposal.
UnitDisposalInstructions
Units no longer required can be returned to SchillerAGfor 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
Department of Communications. These limits are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio
frequencyenergy and,if notinstalled andused inaccordance withthis instructionmanual, maycause harmfulinterference
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
andBatteryCare
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 Schiller AG for disposal.
UnitDisposalInstructions
Units no longer required can be returned to SchillerAGfor 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 rechargeable 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 for 230V, or 2x315mAT for 110V .
To change a fuse press the two retaining lugs on side of the fuse panel (situated below the
mains connector on the back panel. Remove the fuse panel and replace the fuse(s). Click
back the fuse 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 rechargeable 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 for 230V, or 2x315mAT for 110V .
To change a fuse press the two retaining lugs on side of the fuse panel (situated below the
mains connector on the back panel. Remove the fuse panel and replace the fuse(s). Click
back the fuse panel.

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AT-1 User`s Guide
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-1 User`s Guide
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-1 User Guide Art. No. 2. 510 270
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AT-1 User Guide Art. No. 2. 510 270
Manual ECG Recording (Rhythm Strip)
•Prepare skin, hook up patient
•Press ON to switch unit on.
•Press MAN START to start printout.
•Change lead group with and .
•Press STOP to stop the printout.
Electrode hook-up check
•Press key sequence .
The contact resistance of each electrode is printed. Best results are
obtainedwhen the electrodevoltagereadings(right column) arebetween
±50mV.
Filter On/Off
•Press to switch the (Myogram) filter On / Off.
Print System Configuration
•Press key sequence .
Automatic ECG Recording
•Prepare skin, hook up patient
•Press ON to switch unit on.
•Waitfor atleast10 secondsforthe ECGtostabilise.
•Press AUTO to record and print.
•Press COPY for additional copies.
•Press OFF to switch unit off.
AT-1 - User Guide
Short Form Instructions
Manual ECG Recording (Rhythm Strip)
•Prepare skin, hook up patient
•Press ON to switch unit on.
•Press MAN START to start printout.
•Change lead group with and .
•Press STOP to stop the printout.
Electrode hook-up check
•Press key sequence .
The contact resistance of each electrode is printed. Best results are
obtainedwhen the electrodevoltagereadings(right column) arebetween
±50mV.
Filter On/Off
•Press to switch the (Myogram) filter On / Off.
Print System Configuration
•Press key sequence .
Automatic ECG Recording
•Prepare skin, hook up patient
•Press ON to switch unit on.
•Waitfor atleast10 secondsforthe ECGtostabilise.
•Press AUTO to record and print.
•Press COPY for additional copies.
•Press OFF to switch unit off.
AT-1 - User Guide
Short Form Instructions

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Short Form Instructions ................................................ 1
Introduction .................................................................. 4
AT-1 - Operation Modes - Automatic ................................. 5
AT-1 - Operation Modes - Manual Mode ........................... 5
Patient Cable Connections............................................ 6
Standard Leads .................................................................. 7
Recording an ECG in Automatic Mode ........................ 8
Recording an ECG in Manual Mode ............................ 10
Acoustic QRS Indication ..................................................... 10
Location and Power Supply .......................................... 12
Location ............................................................................. 12
Power Supply ..................................................................... 12
Switching the Unit On and Off....................................... 13
Switching On and Off ......................................................... 13
Potential Equalisation......................................................... 13
Keyboard ....................................................................... 14
Settings .......................................................................... 17
Defaults .............................................................................. 18
Printout of Current Settings ................................................ 19
Select Language ................................................................. 20
BaselineFilter .................................................................... 21
Short Form Instructions ................................................ 1
Introduction .................................................................. 4
AT-1 - Operation Modes - Automatic ................................. 5
AT-1 - Operation Modes - Manual Mode ........................... 5
Patient Cable Connections............................................ 6
Standard Leads .................................................................. 7
Recording an ECG in Automatic Mode ........................ 8
Recording an ECG in Manual Mode ............................ 10
Acoustic QRS Indication ..................................................... 10
Location and Power Supply .......................................... 12
Location ............................................................................. 12
Power Supply ..................................................................... 12
Switching the Unit On and Off....................................... 13
Switching On and Off ......................................................... 13
Potential Equalisation......................................................... 13
Keyboard ....................................................................... 14
Settings .......................................................................... 17
Defaults .............................................................................. 18
Printout of Current Settings ................................................ 19
Select Language ................................................................. 20
BaselineFilter .................................................................... 21

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AT-1 User Guide Art. No. 2. 510 270
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AT-1 User Guide Art. No. 2. 510 270
Mains Filter ........................................................................ 22
Myogram Filter .................................................................. 23
Lead Sequence (standard/Cabrera), Printout (simultaneous/
sequential) & Paper Settings .............................................. 24
Automatic Mode (ECG) Settings................................... 25
ECG Format ...................................................................... 25
Average Cycles ................................................................... 26
Measurements and Markings ............................................. 27
Rhythm Leads..................................................................... 28
PatientData Field .............................................................. 30
Measurements................................................................ 31
Heart Rate (HR) ................................................................. 31
Intervals ............................................................................. 31
ElectricalAxis..................................................................... 32
Care & Maintenance ..................................................... 37
Care of your AT-1 .............................................................. 37
Self-test ............................................................................... 37
Maintenance ....................................................................... 37
Replacing the Recording Paper .................................... 38
Trouble Shooting........................................................... 39
Technical Data .............................................................. 40
Mains Filter ........................................................................ 22
Myogram Filter .................................................................. 23
Lead Sequence (standard/Cabrera), Printout (simultaneous/
sequential) & Paper Settings .............................................. 24
Automatic Mode (ECG) Settings................................... 25
ECG Format ...................................................................... 25
Average Cycles ................................................................... 26
Measurements and Markings ............................................. 27
Rhythm Leads..................................................................... 28
PatientData Field .............................................................. 30
Measurements................................................................ 31
Heart Rate (HR) ................................................................. 31
Intervals ............................................................................. 31
ElectricalAxis..................................................................... 32
Care & Maintenance ..................................................... 37
Care of your AT-1 .............................................................. 37
Self-test ............................................................................... 37
Maintenance ....................................................................... 37
Replacing the Recording Paper .................................... 38
Trouble Shooting........................................................... 39
Technical Data .............................................................. 40

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Introduction
The WelchAllyn Schiller AT-1 is a 3-channel ECG recorder with the following features:
°Low weight and compact dimensions.
°Built-in rechargeable battery for mains-independent use.
°Simple one key operation.
°Automatic or manual recording modes.
°Selectable printing formats with integrated quality thermal printer.
°ECG memory for easy copying.
°Choice of 8 languages for printing.
The unit receives and processes all ECG signals simultaneously and continuously records the data in a circular 10 second
memory.
If there is any disturbance (i.e. loose electrode or end of paper), an audible alarm is given and the corresponding indicator
lamp flashes, for example
As long as the disturbance remains, no ECG can be stored. As soon as the defect is eliminated, storage starts.
Introduction
The WelchAllyn Schiller AT-1 is a 3-channel ECG recorder with the following features:
°Low weight and compact dimensions.
°Built-in rechargeable battery for mains-independent use.
°Simple one key operation.
°Automatic or manual recording modes.
°Selectable printing formats with integrated quality thermal printer.
°ECG memory for easy copying.
°Choice of 8 languages for printing.
The unit receives and processes all ECG signals simultaneously and continuously records the data in a circular 10 second
memory.
If there is any disturbance (i.e. loose electrode or end of paper), an audible alarm is given and the corresponding indicator
lamp flashes, for example
As long as the disturbance remains, no ECG can be stored. As soon as the defect is eliminated, storage starts.

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AT-1 User Guide Art. No. 2. 510 270
5
AT-1 User Guide Art. No. 2. 510 270
Introduction
AT-1 - Operation Modes - Automatic
Automatic Mode provides a printout giving 10 seconds of ECG recording of all 12 leads in 2 different formats.
The following can be programmed freely in each of the formats before recording:
°Lead Format
°Chart Speed
°Measurements
°Average Cycles & Markings
For further information see Paragraph “ECG Recording in Automatic Mode”.
AT-1 - Operation Modes - Manual Mode
Manual Mode provides a real time printout of 3 leads that are selected and indicated on the keyboard.
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”.
Introduction
AT-1 - Operation Modes - Automatic
Automatic Mode provides a printout giving 10 seconds of ECG recording of all 12 leads in 2 different formats.
The following can be programmed freely in each of the formats before recording:
°Lead Format
°Chart Speed
°Measurements
°Average Cycles & Markings
For further information see Paragraph “ECG Recording in Automatic Mode”.
AT-1 - Operation Modes - Manual Mode
Manual Mode provides a real time printout of 3 leads that are selected and indicated on the keyboard.
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”.

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Patient Cable Connections
The accessory kit of the electrocardiograph
includes a 10-lead patient cable. This cable is
pluggedintothe patient cablesocket onthe right-
hand side of the unit and secured with the two
screws.
The AT-1 is CF rated. The patient connection
is fully isolated and defibrillation protected.
Protection against defibrillation voltage is
howeveronly ensured, ifthe originalSCHILLER
patient cable (Part-no. 2.400070 / USA:
2.400071) is used. Make sure that during ECG
recording neither the patient nor the conducting
parts of the patient connection or the electrodes
(including the neutral electrode) come into
contactwith otherpersonsor conductingobjects
(even if these are earthed).
The quality of the ECG is dependent on the
preparation and the resistance between the skin
andthe electrode.To ensure a good quality ECG
and minimise the skin/electrode resistance,
remember the following points:
1. Ensure that the patient is warm and
relaxed.
2. Shave electrode area before cleaning.
3. Thoroughlyclean theareawith alcohol.
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
•C3between, andequidistantto, C4and C2
•C6 onleftmidaxillarylineonthesamelevel
as C4
•C5between, andequidistantto, C4and C6
The electrode placements shown on the following page are labelled
withthe colorsaccording toIEC requirements. TheequivalentAHA
colors are given on the table opposite.
Patient Cable Connections
The accessory kit of the electrocardiograph
includes a 10-lead patient cable. This cable is
pluggedintothe patient cablesocket onthe right-
hand side of the unit and secured with the two
screws.
The AT-1 is CF rated. The patient connection
is fully isolated and defibrillation protected.
Protection against defibrillation voltage is
howeveronly ensured, ifthe originalSCHILLER
patient cable (Part-no. 2.400070 / USA:
2.400071) is used. Make sure that during ECG
recording neither the patient nor the conducting
parts of the patient connection or the electrodes
(including the neutral electrode) come into
contactwith otherpersonsor conductingobjects
(even if these are earthed).
The quality of the ECG is dependent on the
preparation and the resistance between the skin
andthe electrode.To ensure a good quality ECG
and minimise the skin/electrode resistance,
remember the following points:
1. Ensure that the patient is warm and
relaxed.
2. Shave electrode area before cleaning.
3. Thoroughlyclean theareawith alcohol.
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
•C3between, andequidistantto, C4and C2
•C6 onleftmidaxillarylineonthesamelevel
as C4
•C5between, andequidistantto, C4and C6
The electrode placements shown on the following page are labelled
withthe colorsaccording toIEC requirements. TheequivalentAHA
colors are given on the table opposite.

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AT-1 User Guide Art. No. 2. 510 270
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
Standard Leads

8
8
Recording an ECG in 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 see ECG settings).
Pressing before recording in automatic mode, the program detects very large waveform amplitudes and
sets the sensitivity for the extremity and/or precordial leads to 5 mm/mV to reduce the overlapping of traces.
Tostartthe automatic ECG recordinginFormat 1, press .
Tostartthe automaticrecordinginthesecondformat,press followedby .
Recording an ECG in 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 see ECG settings).
Pressing before recording in automatic mode, the program detects very large waveform amplitudes and
sets the sensitivity for the extremity and/or precordial leads to 5 mm/mV to reduce the overlapping of traces.
Tostartthe automatic ECG recordinginFormat 1, press .
Tostartthe automaticrecordinginthesecondformat,press followedby .

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AT-1 User Guide Art. No. 2. 510 270
Recording an ECG in Automatic Mode
The printout provides the following information:
°ECG recording of all leads in either Standard or Cabrera format according to selection
°Sensitivity
°Heart Rate
°Speed
and if set:
°Data field to manually insert data
°Average Cycles
°Intervals
°Axis
°Detailed Measurement Table
Toobtain an extra printoutofthe ECG recordinginFormat 1, press .
Toobtain anextra printoutofthe secondformat, press followedby .
Recording an ECG in Automatic Mode
The printout provides the following information:
°ECG recording of all leads in either Standard or Cabrera format according to selection
°Sensitivity
°Heart Rate
°Speed
and if set:
°Data field to manually insert data
°Average Cycles
°Intervals
°Axis
°Detailed Measurement Table
Toobtain an extra printoutofthe ECG recordinginFormat 1, press .
Toobtain anextra printoutofthe secondformat, press followedby .

10
10
Recording an ECG in Manual Mode
Manual mode provides a direct printout of the real-time ECG with full control of parameter selection.
The following can be freely chosen during or before the recording:
Lead Group with and
The following lead groups are selectable:
Additionally lead V1, II and V5 can be printed by pressing:
followed by
Set Chart Speed
Set Sensitivity
Acoustic QRS Indication
The acoustic QRS indication can be switched on or off at any time
by pressing the QRS BEEP key .
Recording an ECG in Manual Mode
Manual mode provides a direct printout of the real-time ECG with full control of parameter selection.
The following can be freely chosen during or before the recording:
Lead Group with and
The following lead groups are selectable:
Additionally lead V1, II and V5 can be printed by pressing:
followed by
Set Chart Speed
Set Sensitivity
Acoustic QRS Indication
The acoustic QRS indication can be switched on or off at any time
by pressing the QRS BEEP key .