Schiller CARDIOVIT AT-2 How to use

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SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
AT-2
6-Channel
ECG unit
Service Handbook
SCHILLER AG
Altgasse 68
CH-6340 Baar, Switzerland
Phone: + 41 41 766 42 42
Fax: + 41 41 761 08 80
Home page: http://www.schiller-ag.ch/
June 1998 Article Number: 2.540 010
Operator Manual
Cardio Menu

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SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
AT-2 Service Handbook
Article Number 2. 540 010
Issue 1 : February 1996
Issue 2 : June 1998 , Update and revision to incorporate latest hardware and software.
Issue 2.1: November 1998, minor corrections incorporated including new schematic.
Associated Documents
Guide to the SCHILLER Interpretation
and Measurement Program E/ D/ F Article No. 2. 510 179
SCHILLER AT-2 User Guide - English / German / French Article No. 2. 510 100
SCHILLER AT-2 User Guide - Italian / Spanish / Portuguese Article No. 2. 510 200
Copyright © 1998 by SCHILLER AG
Windows is a trademark of Microsoft Corporation.

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SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
DECLARATION OF CONFORMITY
Diagnostic System: Cardiovit AT-2
Serial numbers starting with: 040.
Year of manufacture: 1997 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.: 11425-01 ISO 9001 (Rev.1994) EN 46001 by SQS
45112-60-01 ISO 9001/08.94 EN 46001 / 12.93 by DEKRA and
45112-16-01 Annex II, Section 3 of the Directive 93/42/EEC
4T !"$
Baar (Switzerland) Dated 20.05.1998
J. J. Schmid Markus Bütler
Research & Development Manager Quality Assurance Manager

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SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Where to Obtain Service
America WELCH ALLYN SCHILLER Inc., 7420 Carroll Road, San Diego, CA 92121.
Telephone: [phone] Fax: [phone]
www.welchallyn.com
Asia Pacific SCHILLER Asia Pacific, 10A Jalan SS 3/33, Taman University, 47300 Petaling Jaya, Malaysia
Telephone: [phone]
Fax: [phone]
Austria SCHILLER Handelsgesellschaft GmbH Medizintechnik, Kampmüllerweg 24, A-4044 Linz,
Austria.
Telephone: [phone]
Fax: [phone]
France SCHILLER France S.A, Zac des Luats 58, Route de Champigny, F-94350 Villiers Sur Marne,
France.
Telephone: [phone]
Fax: [phone]
Germany SCHILLER Medizintechnik GmbH, Rudolf Diesel Strasse 14, D-85521 Ottobrunn, Germany.
(EU-Bevollmächtiger) Telephone: [phone]
Fax: [phone]
Hotline: [phone]
India Schiller Healthcare India Pvt. Ltd. Kalpatarn Chambers, Nanik Motwane Lane, Ground Floor,
Fort, Mumbai 400 023
Telephone: [phone]
Fax: [phone]
Italy ESAOTE SPA (SCHILLER), Via di Caciolle 15, I-50125 Firenze, Italy.
Telephone: +39 / 055 4229 201
Fax: +39 / 055 4229 208
Switzerland SCHILLER Reomed AG, Riedstrasse 14, CH-8953 Dietikon, Switzerland.
Telephone: [phone]
Fax: [phone]
All other SCHILLER AG, Altgasse 68, CH-6340 Baar, Switzerland.
Countries Telephone: + 41 41 766 42 42 Fax: + 41 41 761 08 80
Home Page: http://www.schiller-ag.ch/

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SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Warranty
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 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
SCHILLER and AT-2 are registered trademarks of SCHILLER AG. All trademarks are the property
of their owners.
Copyright Notice
© Copyright 1998 by SCHILLER AG. 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 SCHILLER AG.
Terms of Warranty
The SCHILLER AT-2 is warranted against defects in material and manufacture for the duration
of one year (as from date of purchase). Excluded from this guarantee is damage caused by an
accident or as a result of improper handling. The warranty entitles free replacement of the defective
part. Any liability for subsequent damage is excluded. The warranty is void if unauthorized or
unqualified persons attempt to make repairs.
In case of a defect, contact your dealer or the manufacturer.
The manufacturer can only be held responsible for the safety, reliability, and performance of the
apparatus if:
* assembly operations, extensions, readjustments, modifications, or repairs are carried out by
persons authorized by him, and
* the AT-2 and approved attached equipment are used in accordance with the manufacturers
instructions.
THERE ARE NO EXPRESS OR IMPLIED WARRANTIES WHICH EXTEND BEYOND THE
WARRANTIES HEREINABOVE SET FORTH. SCHILLER MAKES NO WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO
THE PRODUCT OR PARTS THEREOF.

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SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
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.
SWITCH THE UNIT OFF BEFORE CLEANING AND DISCONNECT FROM THE MAINS.
DO NOT, UNDER ANY CIRCUMSTANCES, IMMERSE THE UNIT OR CABLE
ASSEMBLIES IN LIQUID.
DO NOT OPERATE THE UNIT 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
USE ONLY ACCESSORIES AND OTHER PARTS RECOMMENDED OR SUPPLIED BY
SCHILLER AG. USE OF OTHER THAN RECOMMENDED OR SUPPLIED PARTS MAY
RESULT IN INJURY INACCURATE INFORMATION AND/ OR DAMAGE TO THE UNIT.
THIS UNIT COMPLIES WITH EMC REGULATIONS FOR MEDICAL PRODUCTS WHICH
AFFORDS PROTECTION AGAINST EMISSIONS AND ELECTRICAL INTERFERENCE.
HOWEVER SPECIAL CARE MUST BE EXERCISED WHEN THIS UNIT IS USED WITH
HIGH FREQUENCY EQUIPMENT.
IT MUST BE ENSURED THAT NEITHER 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 A PACEMAKER PATIENT
OR WITH SIMULTANEOUS USE OF OTHER ELECTRICAL STIMULATION
EQUIPMENT. HOWEVER, THE STIMULATION UNITS SHOULD ONLY BE USED AT A
SUFFICIENT DISTANCE FROM THE ELECTRODES. IN CASE OF DOUBT, THE
PATIENT SHOULD BE DISCONNECTED FROM THE RECORDER.

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SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Safety Notices
THIS UNIT IS CF CLASSIFIED ACCORDING TO IEC 601-1. THIS MEANS
THAT THE PATIENT CONNECTION IS FULLY ISOLATED AND DEFIBRILLATION
PROTECTED. SCHILLER CAN ONLY GUARANTEE PROTECTION AGAINST
DEFIBRILLATION VOLTAGE, HOWEVER, WHEN THE ORIGINAL SCHILLER PATIENT
CABLE IS USED.
BEFORE USING THE UNIT, ENSURE THAT AN INTRODUCTION REGARDING THE
UNIT FUNCTIONS AND THE SAFETY PRECAUTIONS HAS BEEN PROVIDED BY A
SCHILLER REPRESENTATIVE.
THE GUIDELINES FOR PATIENT ELECTRODE PLACEMENT ARE PROVIDED AS ON
OVERVIEW ONLY. THEY ARE NOT A SUBSTITUTE FOR MEDICAL EXPERTISE.
THIS UNIT IS PROVIDED FOR THE EXCLUSIVE USE OF QUALIFIED PHYSICIANS OR
PERSONNEL UNDER THEIR DIRECT SUPERVISION. THE NUMERICAL AND
GRAPHICAL RESULTS AND ANY INTERPRETATION DERIVED FROM A RECORDING
MUST BE EXAMINED WITH RESPECT TO THE PATIENTS OVERALL CLINICAL
CONDITION. THE RECORDING PREPARATION QUALITY AND THE GENERAL
RECORDED DATA QUALITY, WHICH COULD EFFECT THE REPORT DATA
ACCURACY, MUST ALSO BE TAKEN INTO ACCOUNT.
IT IS THE PHYSICIANS RESPONSIBILITY TO MAKE THE DIAGNOSIS OR TO OBTAIN
EXPERT OPINION ON THE RESULTS, AND TO INSTITUTE CORRECT TREATMENT
IF INDICATED.

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SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
What's in this book
THE SERVICE PHILOSOPHY FOR ALL SCHILLER UNITS IS FAULT FINDING TO
MODULE LEVEL ONLY. THE PURPOSE OF THIS BOOK IS TO PROVIDE ALL THE
INFORMATION NECESSARY TO ENABLE THE SERVICE ENGINEER TO EFFICIENTLY
LOCATE AND REPLACE A FAULTY MODULE. THIS BOOK ASSUMES NO DETAILED
KNOWLEDGE OF THE AT-2 BUT DOES REQUIRE THAT THE SERVICE ENGINEER IS
FAMILIAR WITH STANDARD WORKSHOP PRACTICES.
The book is divided into the following chapters:
Chapter 1 - Operating Elements
The purpose of this chapter is to provide an easy reference for all the main operator functions and
to give a basic introduction to the AT-2. This chapter gives details of the operator controls with
the operation and function of each key briefly explained. The information in this chapter provides
a background to the operating functions only. Complete operating information is provided in the
SCHILLER AT-2 User Guide.
Chapter 2 - Functional Overview
This chapter provides a functional overview of the AT-2. The description is supported by functional
block diagrams.
Chapter 3 - Fault Diagnosis
This chapter provides a guide to locate a fault to module level. The diagnostics are presented in
a logical sequence of fault finding algorithms and procedures. Illustrations are provided to support
the text where needed.
Chapter 4 - Module Removal and Replacement
This chapter gives an overview of the physical construction of the AT-2 with the main physical
attributes of the unit briefly described. The physical description is supported by illustrations
showing the internal location of all modules. Removal and replacement instructions for all
removable modules are also provided in this chapter. Each procedure is autonomous with details
of tools, jumper settings, adjustments and settings or special requirements that are required before
and after replacement. Functional checks that must be carried out after replacing a module are
also provided.
Chapter 5 - Adjustments
This chapter provides all adjustments and settings. Also detailed in this chapter are basic functional
test procedures that can be performed to check the functioning of the unit.
Chapter 6 - Spare Parts
This chapter provides the part numbers and reordering information for all replaceable modules.
Also included in this chapter are details of any special test equipment or special tools required for
adjustment or fault finding procedures.

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SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
What's in this book
Chapter 7 - Technical Data
The full technical specification of the AT-2 is given in this chapter.
Chapter 8 - Glossary
This chapter explains all the acronyms and signal titles used in this book and in the AT-2 circuit
diagrams.
Index
Circuit Diagrams & Board layouts
The circuit diagrams and component layouts are provided for all boards. These details are provided
for information only.
General Symbols
We need your help
The philosophy of SCHILLER is one of continuous
improvement. Our aim is to provide the user with the most
up-to-date information and the latest technological
developments.
Your suggestions and comments are welcome on all
SCHILLER documentation. Please contact the SCHILLER
Technical Documentation Department.
Fax No: + 41 (0)41 761 03 34

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SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998

Page 1.1
Chapter 1
Operating Elements
SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Chapter 1
Operating Elements
Contents
Introduction 1.2
Location & Power 1.3
The Keyboard 1.4
AT-2 Short Form Operating Instructions 1.5
Modes of Operation 1.6
Automatic Mode 1.8
Manual Mode 1.9
Settings 1.10
Automatic Mode (ECG) Settings 1.18
Care & Maintenance 1.22
Replacing the Recording Paper 1.23
Thermal Paper Handling 1.24

Page 1.2
SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Chapter 1
Operating Elements
Introduction
The CARDIOVIT AT-2 is a 6-channel ECG recorder with all (12) ECG signals simultaneously
processed to provide instant ECG recordings. Two automatic recording modes can be individually
preset to enable one button ECG recording of preferred print formats.
Individual lamps are provided to give power, paper error, filter, lead group and lead off indications.
In addition, any detected disturbance (i.e. loose electrode or end of paper), gives an audible alarm
and the corresponding indicator lamp flashes.
The AT-2 includes the following features:
 Low weight and compact dimensions
 Large A4 size printout from integrated quality thermal printer
 Built-in rechargeable battery for mains-independent use - 4hrs normal use or 300 printouts
on one battery charge
 Simple one key operation for main functions
 Automatic or manual recording modes
 Selectable printing formats
 ECG memory for easy copying
 Interpretation program option (including measurements) for children and adults

Page 1.3
Chapter 1
Operating Elements
SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
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 or from the built-in rechargeable battery. The power source is indicated by the
resp. indicator lamp. When battery capacity is limited, the battery symbol flashes on and off.
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 approximately 6 hours
of normal use. The unit can remain connected to the mains supply without any danger of damage
to either the battery or the unit.
Switching On and Off
The CARDIOVIT AT-2 is switched on with the green ON key
and off by means of the red OFF key
The unit is automatically switched off after 5 minutes (30 seconds if battery capacity is limited) if
no key is pressed and the patient cable is not connected.
Potential Equalisation
If the AT-2 is used in conjunction with other patient connected equipment, we recommend that
the potential equalisation stud on the rear of the unit is connected to the hospital/ building common
ground with the yellow/green ground cable (Part-no. 2.310005). When working from an emergency
vehicle, the vehicle common ground can be used.

Page 1.4
SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Chapter 1
Operating Elements
The Keyboard

Page 1.5
Chapter 1
Operating Elements
SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Automatic ECG Recording
•Prepare skin, hook up patient.
•Switch unit on, press ON
•Press AUTO to record and print.
•Press COPY for additional copies.
AT-2 Short Form Operating Instructions
Manual ECG Recording (Rhythm Strip)
•Prepare skin, hook up patient.
•Switch unit on, press ON
•Press MAN START
•Change lead group with
•Press STOP to stop the printout.
Electrode hook-up check
•Press for print-out of
electrode dc offsets.
Best results are obtained when the electrode voltage readings
(right column) are between ±50mV.
Filter On/Off
•Press to switch the (Myogram) filter On / Off.
System Configuration
•Press to print system
settings.

Page 1.6
SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Chapter 1
Operating Elements
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`.

Page 1.7
Chapter 1
Operating Elements
SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Modes of Operation (cont.)
Manual Mode
Manual Mode provides a real time print-out of 6 selected leads.
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.

Page 1.8
SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Chapter 1
Operating Elements
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 is pressed before recording in automatic mode, the
unit 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.
To start the automatic ECG recording in Format 1, press the AUTO key:
To start the automatic recording in the second format, press the ALT key followed by the
AUTO key:
+
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
 Detailed Measurement Table
To obtain an extra printout of the ECG recording in Format 1, simply press the COPY key:
COPY
To obtain an extra printout of the second format, press the ALT key followed by the COPY key:
ALT - COPY
Note: The Auto mode settings for the two formats are detailed in the paragraph entitled '
Automatic Mode (ECG) Settings` later in this chapter.

Page 1.9
Chapter 1
Operating Elements
SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Manual Mode
Manual mode provides a direct printout of the real-time ECG with full control of parameter
selection.
To start the manual recording of a real-time ECG, press the MANUAL Printout key
To stop the manual recording (printout) press the STOP key
The printout provides you with the following:
 Six (selected) leads with lead identification.
 On the lower edge, the chart speed, time and date, user identification and filter settings (if
on).
 At the top, the heart rate as current average of 4 beats, trace sensitivity.
The following can be freely chosen during or before the recording:
Lead Group by means of the LEAD FORWARD
and LEAD BACKWARD key
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
Chart Speed Select speed 5, 25 or 50mm/s by means of the SPEED keys:
Sensitivity Select 5, 10 or 20 mm/mV by means of the SENSITIVITY keys:
Myogram Filter Switch the filter ON or OFF with the FILTER key:
25 Hz or 35 Hz is displayed on the bottom line of the printout when
the filter is switched on.
Recentering To re-centre the ECG traces, press the 1mV key

Page 1.10
SCHILLER AT-2 6-Channel ECG Unit
SERVICE HANDBOOK Issue 2.1 November 1998
Chapter 1
Operating Elements
Settings
Each parameter is set by means of a code. This code comprises a combination of keys starting
with the ALT key followed by two or three numbers. The setting is confirmed with the STOP
key. As soon as the ALT key is pressed, the keyboard is dedicated to the programming function.
Note: The Alternative (ALT) function is only active for 4 seconds. If a programming key is
not pressed within 4 seconds, the unit reverts to standard mode. The ALT key must
again be pressed to activate the programming mode
The setting is remembered and the keyboard released for other functions when the STOP key is
pressed. Once a setting has been confirmed, it is stored in the memory even when the unit is
switched off.
Example
If you want to set the language on your AT-2 to English, the key sequence given on the table (se
page 13), is
ALT - 0 - 2 - 2 - STOP.
On the following pages the programmable parameters and the programming sequences are
described in detail.