Schiller AT-10 Service Handbook
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Cardiovit
ECG and
AT-10
Spirometry Unit
Service Handbook
SCHILLER AG
Altgasse 68
CH-6341 Baar, Switzerland
Phone: + 41 41 766 42 42
Fax: + 41 41 761 08 80
Home page: http://www.schiller.ch
April 2002 Article Number: 2. 540 005
i
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
AT-10 Service Handbook
Article Number 2. 540005
Issue 1: January 1993
Issue 2: July 1998
Issue c: April 2002
Associated Documents
Guide to SCHILLER Interpretation
and Measurement Program E / D / F Article No. 2.510179
SCHILLER AT-10 USER GUIDE - English Article No. 2.510127
SCHILLER AT-10 USER GUIDE - German Article No. 2.510126
SCHILLER AT-10 USER GUIDE - French Article No. 2.510128
© Copyright 2002 by SCHILLER AG
ii
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Where to Obtain Service
WELCH ALLYN SCHILLER Inc., 7420 Carroll Road, San Diego, CA , US-92121-2334
USA
USA / Canada
Asia Pacific
Tel.: +1 858 635 6023 Fax : +1 858 635 6611
Home Page : www.welchallyn.com
SCHILLER Asia Pacific, 10 Jalan SS 3/33, Taman Universiti, 47300 Petaling Jaya, Selangor,
Malaysia
Tel.: + 603 7877 5336 Fax : + 603 7877 5744
Austria
France
Germany (EU
authorized
representative)
India
Italy
Switzerland
All other
countries
SCHILLER HmbH, Kampmüllerweg 24, A-4044 Linz, Austria
Tel.: + 43 732 709 90 Fax : + 43 732 757 000
SCHILLER Medical S.A, BP 50, 19, Avenue de la Gare, F-67162 Wissembourg / Cedex,
France
Tel.: +33 3 88 63 36 00 Fax : +33 3 88 94 12 82
SCHILLER Medizintechnik GmbH, Rudolf-Diesel Strasse 14, D-85521 Ottobrunn, Germany
Tel.: + 4989 629 981 0 Fax : + 4989 609 509 0
SCHILLER Healthcare India Pvt. Ltd.,D.C.Silk Mills Compound, 'A' Wing, 1st floor, 5,
Chunawala Estate, Kondivitta Lane, Andheri - Kurla Road, Andheri (E, Mumbai - 400 059,
India
Tel.: + 9122 826 3520 Fax : + 9122 826 3525
ESAOTE Spa (SCHILLER ), Via di Caciolle 15, I-50127 Firenze, Italy
Tel.: + 39055 4229 201 Fax : + 39055 4229 208
SCHILLER Reomed AG, Riedstrasse 14, CH-8953 Dietikon, Switzerland
Tel.: +411 744 3000 Fax : + 411 740 3710
SCHILLER AG, Altgasse 68, CH-6341 Baar, Switzerland
Tel.: + 4141 766 4242 Fax : + 4141 761 0880
Home Page : www.schiller.ch
iii
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-10 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.
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Terms of Warranty
The SCHILLER AT-10 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, send the apparatus to your dealer or directly to 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 unit and approved attached equipment is 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.
iv
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
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.
IF THE DISPLAY IS DAMAGED, A LEAKAGE OF FLUID MAY OCCUR. DO NOT INHALE
THE VAPOUR FROM THIS FLUID AND AVOID CONTACT WITH MOUTH AND SKIN. IF
CONTACT IS MADE, CLEAN CONTAMINATED AREA IMMEDIATELY WITH FRESH
WATER.
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.
THE AT-10 COMPLIES WITH EMC REGULATIONS FOR MEDICAL PRODUCTS WHICH
AFFORDS PROTECTION AGAINST EMISSIONS AND ELECTRICAL INTERFERENCE.
HOWEVER SPECIAL CARE MUST BE EXERCISED WHEN THE AT-4 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.
v
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.
WHEN NON-MEDICAL DEVICES ARE CONNECTED TO THE RS-232 INTERFACE ENSURE
THAT BOTH UNITS ARE SECURELY CONNECTED TO THE SAME EARTH POTENTIAL.
WHEN OPERATING THE UNIT ON BATTERY AND SIMULTANEOUSLY USING NONMEDICAL DEVICES, THE RS-232 INTERFACE MUST BE FULLY ISOLATED.
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.
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
THE AT-10 ECG 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.
vi
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
What´s in this Book
THE SERVICE PHILOSOPHY FOR ALL SCHILLER UNITS IS FAULT FINDING TO
MODULE LEVEL. 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-10 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-10. 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-10 Operating Manual.
Chapter 2 - Functional Overview
This chapter provides a functional overview of the AT-10 The functional 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 - Physical Overview & Module Replacement
This chapter gives an overview of the physical construction of the AT-10 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
replaceable 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 new module are
also provided.
Chapter 5 - Functional Checks & 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.
Chapter 7 - Technical Data
The full technical specification of the AT-10 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-10 circuit
diagrams.
vii
What´s in this Book
Circuit Diagrams & Board Layouts
The circuit diagrams and component layouts are provided for all boards. These details are provided
for information only.
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
viii
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Introduction 1.2
The Keyboard 1.4
Alpha Numeric Keypad 1.4
General Purpose Keys 1.4
Control Keys 1.6
Function Keys 1.7
Resting ECG Function Keys 1.7
Exercise Function Keys 1.8
Connector Panels 1.9
Side Panel 1.9
Back Panel 1.10
Mains Panel 1.11
Liquid Crystal Display 1.12
Calibration 1.13
Manual Baseline Reset 1.13
System Setup 1.14
Defining Macro Functions 1.14
Save Settings 1.15
ECG Menu 1.16
Filters 1.17
Baseline Filter 1.17
Myogram Filter 1.17
Mains Filter 1.17
Number of Printed Copies 1.18
Lead Sequence 1.19
User-programmable Lead Group 1.20
Programmable channels for Printout 1.21
Chapter 1
Operating Elements
Chapter 1
Operating Elements
Contents
1.7
Page 1.1
Chapter 1
Operating Elements
Introduction
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
The Schiller Cardiovit AT-10
The CARDIOVIT AT-10 is a sophisticated compact work-station for cardiological diagnosis. It has
the facility to carry out both resting and exercise ECGs with the test results displayed on the integral
LCD and recorded on the built-in thermal printer.
Three RS-232 interfaces and one RS-422 interface are provided for the connection of digitally
controlled exercise test equipment, blood pressure equipment, and for data transmission/reception.
The unit also has facilities for connection of an external video monitor, experimental DC inputs, and
analog controlled exercise equipment.
With ECG program options, the AT-10 can be upgraded to provide ECG interpretation, exercise
test evaluation, pacemaker measurement and Frank vector loops. A Spirometry option enables
Spirometry tests to be performed and pulmonary function diagnosis to be carried out.
The AT-10 can also be connected to the Schiller PC-based data management program (designated
SEMA-200), for the validation and archiving of recorded data.
Page 1.2
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Introduction (cont.)
The main operating and connection modules of the Cardiovit AT-10 are as follows:
l Keyboard The keyboard is divided into three functional areas. The
l LCD Screen The LCD screen displays the real-time ECG traces and
l Thermal Printer The printer provides hard copy of test results.
l Right-hand Side Panel The side panel contains dc input connectors, the ECG
Chapter 1
Operating Elements
top area comprises the unit ON/OFF keys, the paper tray
key and other general function keys. The central area
contains dedicated control and function keys, and the
bottom area contains the alpha-numeric keys and other
general function keys.
certain operating and status information. Under operator
control the display also gives menu options and displays
operator entered data. The display is folded down when not
in use.
patient connector, the Spirometry connector and RS serial
connectors. When the floppy disk storage option is installed,
the disk drive is installed on this side panel.
l Left-hand Side Panel This panel contains the paper tray and (below the paper
tray) the program pack.
l Rear Panel The rear panel contains the data input/output connector,
the external video monitor and the ERGO connector. The
rear panel also contains the mains connector with on/off
switch, voltage selector and mains fuse. When the LAN
option is installed the LAN connector is mounted on the
back panel
Page 1.3
Chapter 1
Operating Elements
The Keyboard
Alpha Numeric Keypad
The functions of the dual purpose keys on the alphanumeric keyboard are as follows:
KEY FUNCTION
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
DUAL PURPOSE KEYS
'1' to
'7'
Printout Speed Selection 2.5, 5, 10, 12.5, 25, 50, or 100
mm/s
'8' to `_ Printout Sensitivity Selection 2.5, 5, 10, or 20 mm/mV
General Purpose Keys
The general purpose keys to the right of the alpha-numeric keypad, are as follows:
Page 1.4
The direction keys are used to move the cursor in order to make menu selections
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
The Keyboard (cont.)
Chapter 1
Operating Elements
The top line of the keyboard is dual purpose and when the unit is in the ECG mode, these keys double
as control for the direct setting of speed and sensitivity for manual printout. Otherwise, the
alphanumeric keyboard serves as a normal keyboard for data input.
Page 1.5
Chapter 1
Operating Elements
The Keyboard (cont.)
Control Keys
The Control keys are situated at the top of the keyboard and contain the function keys which are
common to all function modules. The control keys are as follows:
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Page 1.6
Note: Slight functional differences may exist in different modes
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
The Keyboard (cont.)
Function Keys
The function keys are arranged in a group in the middle of the keyboard. The left part of the group
comprises keys for the resting ECG recording functions. The middle part comprises keys for the
Exercise ECG functions. On the right hand side is the SPIRO key for the optional pulmonary
function testing program. The following is a summary of the keys and their functions:
Resting ECG Function Keys
Chapter 1
Operating Elements
Page 1.7
Chapter 1
Operating Elements
The Keyboard (cont.)
Exercise Function Keys
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Page 1.8
* The grade increases when pressed in conjunction with the YES (+) key and decreases when
pressed in conjunction with the NO (-) key.
The Speed/Load increases when pressed in conjunction with the YES (+) key and decreases
when pressed in conjunction with the NO (-) key.
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Connector Panels
Side Panel
Chapter 1
Operating Elements
The following are located on the side panel:
1. 1 X RS-232C interface for connection of a bicycle with blood pressure measuring device
(Port 1)
2. 1 X RS-232C interface for connection of an ergometer (bicycle or treadmill) (Port 2)
3. 1 X RS-232C interface for data transfer (Port 3)
4. 1 X RS-422 interface for data transfer
5. LCD contrast control
6. DC inputs: DC2 0.5V/cm
7. DC inputs: DC1 0.5V/cm
8. Connection for SP-20, SP-150, SP-110 or SP-110/R flow sensor for lung function
measurements (Option)
9. Test socket for electrode leads with control light
10.EKG / ECG Socket for patient cable
Note: The socket is CF rated ie fully floating and isolated, defibrillation protected, suitable
for intra-cardiac application.
Page 1.9
Chapter 1
Operating Elements
Connector Panels (cont.)
Back Panel
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
The following connectors are located on the back panel:
1. Identification Plate
2. Mains Module
3. Connector for external video
4. Exercise (stress) test connection for analogue ergometers (bicycle or treadmill)
5. Data I/O socket for connection of foot-switch, QRS trigger, treadmill elevation control
6. Potential equalisation (ground) connection
7. Local area network Connector (Option)
Page 1.10
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Connector Panels (cont.)
Mains Panel
Chapter 1
Operating Elements
The following are located on the mains panel:
1. Mains fuse (200 mA slow) and voltage selector
2. Mains connection
3. Voltage indicator (mains)
4. Power on / off switch
Page 1.11
Chapter 1
Operating Elements
Liquid Crystal Display
The liquid crystal display (LCD) performs both as a real-time monitor and as an alphanumeric
display for menu selection, data input and the provision of important information.
The display can be folded down when not in use. The contrast can be adjusted by means of the LCD
control located on the side panel of the unit.
A typical display of an ECG recording (with patient simulator connected) is as follows:
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Depending on the function, the displayed information will vary but the screen is normally divided
into three general area as follows:
l The top of the screen gives status and operating information. These are permanently
displayed.
l The central part of the screen is taken up with the measured waveform (ie ECG trace, Lung
function curve, etc) with the lead identifications or measurement units on the left-hand side.
l The bottom of the screen displays the time interval of the recording, indicated in seconds.
The very bottom line gives, from left to right:
• Selected Baseline and Myogram filter settings
• Speed, sensitivity and the number of channels (for direct (manual) print-out)
• The leads that are selected for the printout (for direct (manual) print-out)
Page 1.12
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Calibration
At any time during the ECG recording, a 1mV calibration signal can be manually produced by
pressing the <1mV> key on the keyboard. This 1mV square wave signal is indicated both on the
display and on the printout.
Manual Baseline Reset
Pressing the manual baseline recentre key resets the displayed traces to the optimal
position. Use this key to centre the real-time ECG traces, when `drifting´ occurs.
Chapter 1
Operating Elements
Page 1.13
Chapter 1
Operating Elements
System Setup
There are several general settings for the AT-10. Press the <FNCT> key to call up the initial menu.
Two options are presented. Option 1 is for entry of the operator information - MTA (Medical
technical Assistant). The second menu item is the set-up option. Press <2> and the System Setup
menu is displayed as follows:
When the menu is entered, the cursor is always located on the first item. There are two ways to select
a particular menu item as follows:
• press the number indicated to the left, or
• use the direction keys to move the cursor to the item required and press the <ENTER> key.
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Most of the options are self explanatory in the set-up menu, however the macro function and the save
setup options are detailed here.
Defining Macro Functions
With the AT-10 you can create your own macro functions and assign them to one of the first six
numerical keys on the alphanumeric keyboard. Up to 30 keystrokes can be stored for one macro
enabling you to call up a particular sub-menu or to carry out a particular programming sequence by
pressing only two keys.
Note: Before starting to program a macro, it is advisable to carry out the sequence making
a note of the order of the key strokes for reference.
In the System Setup menu, press key <1> to call up the Macro function input menu. To start the
programming sequence, press key <I> , then the number key which you wish to program and then
carry out the required sequence.
Once the sequence is completed, press the <2nd> key followed by the <ESC> key and storage of
the keystroke sequence is confirmed by an audible tone.
To initiate a programmed Macro sequence, press the <2nd> key and then the programmed number
key on the alphanumeric keyboard. The sequence will remain stored until a new sequence
overwrites the existing macro programmed for that key.
Page 1.14
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
System Setup (cont.)
Save Settings
Programmable parameters can be stored as base settings. These stored settings are not erased when
the unit is switched off. To call up this function, select the last item in the System Setup menu and
the Save Settings menu is displayed as follows:
Chapter 1
Operating Elements
See the AT-10 Operating Manual for full explanation. By pressing <ENTER>, the actual
configuration will be permanently stored and confirmation is given with the message:
*** Settings memorized! ***.
By pressing key "X" the factory default settings are activated. Press <ENTER> and these settings
are stored and confirmed through the message:
*** Settings memorized! ***.
Page 1.15
Chapter 1
Operating Elements
ECG Menu
To call up the menu for any of the main functions, simply press the respective function key (eg
<ECG> for resting ECG, <EXERCISE> for exercise ECG, etc). To return from any menu directly
to the Monitor mode, press the <FNCT> key. To return from any menu to the previous menu, press
the ESC key. To call up the main resting ECG menu, press the ECG key.
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Page 1.16
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Filters
There are five filters which can be set before starting the recording of an ECG. To call up the menu
for these filters, press the <ECG> key, then select option `ECG Settings´ followed by 'Filters´. The
following menu is displayed:
Chapter 1
Operating Elements
Baseline Filter
A digital baseline filter has been designed in order to suppress excessive baseline drifts. By pressing
key <1> (for resting ECGs) or key <2> (for exercise ECGs), the setting can be altered to one of the
following values: 0.50, 0.25, 0.12 or 0.05 Hz. The value set is the lower limit of the frequency range
and is normally set to 0.05Hz (IEC recommendation), i.e. a frequency range of 0.05 to 150Hz.
The settings 0.12, 0.25 and 0.50Hz should only be used when absolutely necessary as the possibility
exists that they could affect the original ECG signal, especially the ST segments.
Pressing key <4>, <5> or <7> toggles the smooth filter, the baseline stabilisation or the pacemaker
detection circuit on or off.
The current baseline filter setting is indicated at the bottom of the screen. Once the setting has been
changed, firstly press the <FILTER> key in order to reset this indication.
Myogram Filter
The myogram filter suppresses disturbances caused by strong muscle tremor. This filter can be
switched on and off by pressing the <FILTER> key. When set to off, the displayed setting will be
150Hz. When set to on, the selected cut-off frequency (25 or 35Hz) will be indicated.
To alter the setting for the filter, press key <3> and the cut-off frequency can be set to either 25 or
35Hz. The current Myogram filter setting is indicated at the bottom of the screen to the right of the
baseline filter setting. Once the setting has been changed, press the <FILTER> key in order to reset
this indication.
The stored ECG can be printed either with or without passing the myogram filter.
Note: Using the myogram filter causes wave amplitudes on the printout to be reduced by as
much as 20%. Average cycles and measurement values however are not affected by
this filter.
Mains Filter
The mains filter is an adaptive 50Hz / 60Hz digital interference filter designed to suppress ac
interference without attenuating or distorting the ECG. By pressing key <6>, the filter can be set
according to country requirements to either 50Hz (for most European countries) or 60Hz (for the
USA) or switched off.
Page 1.17
Chapter 1
Operating Elements
Number of Printed Copies
The number of copies to be printed out can be pre-selected. To do this, press the <ECG> key, select
the ECG Settings / Further Settings menu option and then select ''Number of copies'' (1).
Press key <1> several times to select the required number of copies (either 1, 2, 3, 4 or none).
The unit will now produce the specified number of ECG copies whenever the <AUTO START>
or <COPY> key is pressed.
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Page 1.18
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Lead Sequence
The lead sequence can be set to either Standard or Cabrera. The sequence required can be selected
by pressing the <ECG> key, selecting the ECG Settings / Further Settings menu option and then
selecting ''12 Lead Sequence'' (2).
Press key <2> to toggle between Standard and Cabrera leads.
Standard Cabrera
I VI II V4 aVL V1 II V4
II V2 aVF V5 I V2 aVF V5
III V3 III V6 -aVR V3 III V6
aVR V4 V2 V7 II V4 V2 V7
Chapter 1
Operating Elements
Lead Groups
aVL V5 V4 V8 aVF V5 V4 V8
aVF V6 V5 V9 III V6 V5 V9
Page 1.19
Chapter 1
Operating Elements
User-programmable Lead Group
The user-programmable group comprises 12 leads which can be individually programmed. To
program these leads, press the <ECG >key, select the ECG Settings menu option and then select
''Programmable Leads'' (5). The following table is then displayed:
The display shows the leads currently programmed. The numbers 1 to 12 symbolise the order of the
leads and the actual lead identifications show which lead is in which position in the group.
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
To program your own lead group, simply enter the code number of the lead you require and press
it several times to select the lead that you want. As an example, to select lead V1 as the first lead,
press key <1> several times until lead V1 is displayed. All leads can be programmed in this way.
Page 1.20
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Programmable channels for Printout
The number of channels for the printout can be set to either 3, 4 (5,7), 6 or a user-defined number.
To set this user-defined number, press the <ECG> key, select the ECG Settings / Further Settings
menu option and then select ''Programmable Channels'' (3).
Press key <3>, several times to select the required number of channels (ie, 4, 5 or 7). This setting
is particularly useful when, for example, additional Doppler or Phono waveforms are to be recorded
through the experimental inputs.
Note: Selection of the number of channels (ie, 3, 4 or 6) is performed by pressing the
<PRINTER CHANNEL> key and the current selection is indicated at the bottom of
the screen.
Chapter 1
Operating Elements
Page 1.21
Chapter 1
Operating Elements
SCHILLER AT-10 ECG and Spirometry Unit
SERVICE HANDBOOK Issue c April 2002
Page 1.22
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