Schiller at 2 plus инструкция по эксплуатации

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  SCHILLER AT-2plus 6-Channel ECG Unit AT-2plus 6-Channel ECG unit 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/…
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  SERVICE HANDBOOK Issue d May 2002 What’s in this book The service philosophy for the AT-2plus Memory 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.
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  The full technical specification of the AT-2plus Memory 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-2plus Memory circuit diagrams. Circuit Diagrams & Board layouts The circuit diagrams and component layouts are provided for all boards.

• Page 4: Table Of Contents

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 Operating Elements SERVICE HANDBOOK Issue d May 2002 Chapter 1 Operating Elements Contents Introduction List of Symbols Location & Power Switching On and Off The Keyboard LCD Screen AT-2plus Short Form Operating Instructions…

• Page 5: Introduction

  Operating Elements Introduction The CARDIOVIT AT-2plus 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.

• Page 6: Location & Power

  Potential Equalisation If the AT-2plus 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.

• Page 7: The Keyboard

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 SERVICE HANDBOOK Issue d May 2002 Operating Elements The Keyboard Page 1.4…

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  In the `Born` (date of birth field), only the patients year of birth need be entered if desired. When two digits are entered (patients year of birth), the AT-2plus calculates the age of the patient according to the year entered. When the full DOB is entered, the age is calculated precisely.

• Page 9: Lcd Screen

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 SERVICE HANDBOOK Issue d May 2002 Operating Elements LCD Screen 1. Current Heart Rate (averaged over 4 beats and refreshed every 2 seconds). The HR is also given on a manual printout. Note that with an auto mode printout the HR is averaged over the full 10 seconds of the recording.

• Page 10: At-2Plus Short Form Operating Instructions

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 Operating Elements SERVICE HANDBOOK Issue d May 2002 AT-2plus Short Form Operating Instructions Automatic ECG Recording • Prepare skin, hook up patient. • Switch unit on, press ON • Press and enter patient data.

• Page 11: Modes Of Operation

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 SERVICE HANDBOOK Issue d May 2002 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.

• Page 12: Automatic Mode

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 Operating Elements SERVICE HANDBOOK Issue d May 2002 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.

• Page 13: Manual Mode

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 SERVICE HANDBOOK Issue d May 2002 Operating Elements 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…

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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 Operating Elements SERVICE HANDBOOK Issue d May 2002 Manual Mode (cont.) Chart Speed Select speed 5, 10, 25 or 50mm/s by means of the SPEED keys: 5/10 Notes: Key 7 is a toggle key -press once and 5 is selected, press a second time and 10mm/s is selected.

• Page 15: Settings

  Example If you want to reset your AT-2plus to the basic default settings, the key sequence given on page 14 is ALT; 0; 6; 6. STOP. On the following pages the programmable parameters and the programming sequences are described in detail.

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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 Operating Elements SERVICE HANDBOOK Issue d May 2002 Settings (cont.) The defined formats and settings for your unit can be checked as follows: ALT — 0 — 1 — 1 A printout of the defined settings will be produced and gives the following information, depending…
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 SERVICE HANDBOOK Issue d May 2002 Operating Elements Settings (cont.) Interpretation settings: N/A:+/- ‘normal/abnormal’ is written (+) or suppressed (-) U:+/- ‘unconfirmed report’ is written (+) or suppressed (-) A30:+/- patient age is assumed to be < 30 (-) or >30 (+)
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 Operating Elements SERVICE HANDBOOK Issue d May 2002 Settings (cont.) Language The language can only be set with the SWUP program. User Identification The user identification is printed on all recordings. The user ID can be the department, doctor or hospital etc.
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 SERVICE HANDBOOK Issue d May 2002 Operating Elements Settings (cont.) Filters There are three different filters which can be set individually as follows: • Baseline filter • Mains filter • Myogram filter Baseline Filter The digital Baseline filter suppresses excessive baseline drifts.
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 Operating Elements SERVICE HANDBOOK Issue d May 2002 Settings (cont.) Myogram Filter The Myogram filter suppresses disturbances caused by strong muscle tremor. The set value will be the new upper limit of the frequency range as soon as the FILTER key is pressed on or programmed as default when the unit is switched on.
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  All ECG traces are centred dynamically for optimal use of paper width. Auto-Centering OFF ECG traces are set to a fixed baseline position and may possibly overlap. The Standard and Cabrera lead groups available for the AT-2plus are: Lead Groups Standard Cabrera -aVR…
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 Operating Elements SERVICE HANDBOOK Issue d May 2002 Settings (cont.) Acoustic QRS Indication The acoustic QRS beep can be switched on or off at any time by pressing the QRS key Time / Date…

• Page 23: Automatic Mode (Ecg) Settings

  Operating Elements Automatic Mode (ECG) Settings Two separate Auto formats can be defined for the AT-2plus. When defining auto format 1 the key sequence ALT `1` precedes the setting. When defining auto format 2 the key sequence ALT `2` precedes the setting.

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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 Operating Elements SERVICE HANDBOOK Issue d May 2002 Automatic Mode (ECG) Settings (cont.) Average Cycles The Average cycles are defined as follows: Note: Lead selection for the rhythm lead(s) are defined on page 25.
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  Confirm the selection by pressing the STOP key STOP Full details of the interpretation option are given in the SCHILLER ECG Measurement and Interpretation booklet (Art. No. 2.510 179). Interpretation Settings (C version only) The interpretation settings enable the user to determine whether or not certain comments will be added to the interpretation statements on the ECG printout.
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 Operating Elements SERVICE HANDBOOK Issue d May 2002 Automatic Mode (ECG) Settings (cont.) Selecting Rhythm Leads The rhythm leads are printed out as defined. Two separate rhythm leads can be selected. The following formats can be set:…

• Page 27: Memory And Data Transmission Option

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 SERVICE HANDBOOK Issue d May 2002 Operating Elements Memory and Data Transmission Option WARNINGS & CAUTIONS WHEN NON-MEDICAL DEVICES ARE CONNECTED TO THE RS-232 INTERFACE ENSURE THAT BOTH UNITS ARE SECURELY CONNECTED TO THE SAME EARTH POTENTIAL.

• Page 28: Erasing Memory Files

  LINE transmission; sending over the telephone system requires a modem and this form of sending is termed MODEM. Transmission Settings The speed settings options for the AT-2plus are as follows: Serial Communication Interface Transmission Entry Key Sequence…

• Page 29: Modem Transmission

  Check all settings in the SEMACOMM program (baud rate; parity — none; stop bit — 2; time between blocks, records — 100ms). • Check that the transmission speed is the same in both the AT-2plus and the SEMACOMM program. •…

• Page 30: Line Transmission

  Check all settings in the SEMACOMM program (baud rate; parity — none; stop bit — 2; time between blocks, records — 100ms). • Check that the transmission speed is the same in both the AT-2plus and the SEMACOMM program. •…

• Page 31: Software Updating Via Rs-232

  SWUP Programme for Win 95 ( 2 disks or Zip-file from Mailbox) Procedure 1. Connect the AT-2plus Memory with the RS-232 cable to any free COM port on your PC 2. Switch the PC ON and go to Win 95.

• Page 32: Care & Maintenance

  CLEANING LIQUID OR STERILIZE WITH HOT WATER, STEAM, OR AIR. The casing of the AT-2plus can be cleaned with a soft damp cloth on the surface only. Where necessary a domestic non-caustic cleaner can be used for grease and finger marks.

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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 1 SERVICE HANDBOOK Issue d May 2002 Operating Elements Care & Maintenance (cont.) Cleaning the Patient Cable Align the leads in such a way as to prevent anyone stumbling over them or any damage caused by the wheels of instrument trolleys.

• Page 34: Replacing The Recording Paper

  Return the paper tray cover in position and press firmly until secure. • Press the STOP key to transport the paper to the start position. Note: SCHILLER can only guarantee perfect printouts when SCHILLER original chart paper or chart paper of the same quality is used. Page 1.31…

• Page 35: Thermal Paper Handling

  Operating Elements Thermal Paper Handling The thermal paper used in the AT-2plus requires slightly different handling to normal paper as it can react with chemicals and to heat. However, when the following points are remembered, the paper will give reliable results: The following points apply to both storage, and when archiving the results.

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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 2 SERVICE HANDBOOK Issue d May 2002 Functional Overview Chapter 2 Functional Overview Contents Introduction MK 14 — 10 Main Board Power Supply Program and ECG Memory Serial EEPROM Thermal Print Head Controller Printer Timing…

• Page 37: Introduction

  SERVICE HANDBOOK Issue d May 2002 Introduction This chapter provides a functional overview of the AT-2plus electronics. The aim of this overview is to enable the service engineer to identify processing paths in order to help identify possible faulty modules. A functional block diagram supports the text.

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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 2 SERVICE HANDBOOK Issue d May 2002 Functional Overview Page 2.3…

• Page 39: Mk 14 — 10 Main Board

  Chapter 2 SCHILLER AT-2plus 6-Channel ECG Unit Functional Overview SERVICE HANDBOOK Issue d May 2002 MK 14 — 10 Main Board Power Supply The mains supply is full wave rectified to produce an unregulated dc supply of approximately 30 V (+U). This voltage is used by a switched voltage generator to produce +UD (13.5V). +UD charges the battery when mains is connected.

• Page 40: Power On Reset

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 2 SERVICE HANDBOOK Issue d May 2002 Functional Overview MK 14-10 Main Board (cont.) Power On Reset The Power on reset circuit controls the master reset of the CPU. This circuit has two functions as follows: •…

• Page 41: Mk 14-11 Rs-232 Interface Board

  / serial and serial / parallell conversion for the transmission and reception of data and provide signal level compatibility with RS-232 standard. External Modem An external modem can be connected to the RS-232 output from the AT-2plus and be used for transmitting memory contents over a telephone line. Page 2.6…

• Page 42: Top Assembly

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 2 SERVICE HANDBOOK Issue d May 2002 Functional Overview Top Assembly LCD Screen The LCD power supply produces the high voltage for the LCD backlight and the contrast voltage. The ECG signals are stored in a video RAM and the LCD controller converts the data to the proper form for the LCD screen.

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  Chapter 2 SCHILLER AT-2plus 6-Channel ECG Unit Functional Overview SERVICE HANDBOOK Issue d May 2002 Page 2.8…
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 3 SERVICE HANDBOOK Issue d May 2002 Fault Diagnosis Chapter 3 Fault Diagnosis Contents Introduction General Check Procedures Printer Check Print Head Alignment and Print Head Tension RS-232 Test with Test Plug Memory and Data Transmission Check…

• Page 45: Introduction

  SERVICE HANDBOOK Issue d May 2002 Introduction The AT-2plus is designed to be simple to use and simple to service: the service philosophy of the AT-2plus is module replacement and not board repair. The purpose of this chapter is to provide fault-finding procedures that will quickly and efficiently identify a fault to a specific module.

• Page 46: General Check Procedures

  AT-2plus functional areas. The instructions given here are guides to the basic functions. If more operating information is required (general settings, comprehensive menu guides etc.) please refer to Chapter 1 in this publication or the relevant User Manual for the software version applicable.

• Page 47: Printer Check

  Chapter 3 SCHILLER AT-2plus 6-Channel ECG Unit Fault Diagnosis SERVICE HANDBOOK Issue d May 2002 Printer Check To check the printer and to ensure that every pixel is operational, a built-in printer test is provided. To carry out the printer check press: ALT — MAN START A test printout is given.

• Page 48: Test With Test Plug

  To carry out this test proceed as follows: Note: If the SCHILLER test plug is not available a test plug can easily be fabricated from a standard 9-pin D-type connector (female). Shortcircuit the following pins: •…

• Page 49: Memory And Data Transmission Check

  • An RS-232 cable assembly, Art.No. 2.310 159 for connecting the RS-232 interface on the AT-2plus with the COM port of the PC. • A patient simulator attached to the patient connector on the AT-2plus. Test Procedure Command Screen Display…

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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 4 SERVICE HANDBOOK Issue d May 2002 Module Removal and Replacement Chapter 4 Module Removal and Replacement Contents Introduction Safety Notices Physical Overview Exploded View Base Assembly and Printer Exploded View Paper Feed Opening and Closing the Case Printer Tray Assembly and Thermal printer 4.10…
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  Chapter 4 SCHILLER AT-2plus 6-Channel ECG Unit Module Removal and Replacement SERVICE HANDBOOK Issue d May 2002 Remove top assembly In Base assembly access to : Mains trans- Paper tray Board Battery former and assembly MK 14-10 pack connector and motor…

• Page 52: Introduction

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 4 SERVICE HANDBOOK Issue d May 2002 Module Removal and Replacement Introduction This Chapter provides an overview of the procedures to remove and replace the modules that are spared at service level. The instructions given in this chapter are autonomous, with each module containing the following: •…

• Page 53: Safety Notices

  TOP ASSEMBLY REMOVED AND WITH MAINS CONNECTED. WHEN CARRYING OUT THESE PROCEDURES BEWARE THAT POTENTIALLY LETHAL VOLTAGES ARE PRESENT. CAUTIONS THE AT-2PLUS CONTAINS STATIC SENSITIVE CMOS COMPONENTS; OBSERVE ANTISTATIC PRECAUTIONS: WHEN CARRYING OUT ANY MAINTENANCE PROCEDURES ALWAYS PLACE THE UNIT ON AN EARTHED ANTISTATIC MAT.

• Page 54: Physical Overview

  Module Removal and Replacement Physical Overview The AT-2plus unit is enclosed in a two part, medical standard, moulded plastic case. The top part contains the keyboard and the LCD screen with the base section containing all the electronics of the unit, the RS-232 interface, the thermal printer, the paper tray, the battery and mains transformer.

• Page 55: Exploded View Base Assembly And Printer

  Chapter 4 SCHILLER AT-2plus 6-Channel ECG Unit Module Removal and Replacement SERVICE HANDBOOK Issue d May 2002 Exploded View Base Assembly and Printer Page 4.6…

• Page 56: Exploded View Paper Feed

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 4 SERVICE HANDBOOK Issue d May 2002 Module Removal and Replacement Exploded View Paper Feed Page 4.7…

• Page 57: Opening And Closing The Case

  Prerequisites • The unit must be placed on an antistatic mat and antistatic precautions observed when any maintenance is carried out on the AT-2plus. The room temperature should be between 18 and 28 degrees. • THE WARNINGS AND CAUTIONS AT THE BEGINNING OF THE CHAPTER MUST BE OBSERVED.

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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 4 SERVICE HANDBOOK Issue d May 2002 Module Removal and Replacement Opening and Closing the Case Top Assembly Replacement To replace the Top Assembly proceed as follows: 1. Check that all boards and components are firmly secured. Check for loose screws. Ensure that no screws or foreign bodies are loose in the bottom of the case.

• Page 59: Printer Tray Assembly And Thermal Printer

  Chapter 4 SCHILLER AT-2plus 6-Channel ECG Unit Module Removal and Replacement SERVICE HANDBOOK Issue d May 2002 Printer Tray Assembly and Thermal printer Prerequisite • The Warnings and Cautions at the beginning of the Chapter must be observed. • The Top Assembly must be removed as detailed previously. All external cable assemblies must be disconnected.

• Page 60: Thermal Printer Replacement

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 4 SERVICE HANDBOOK Issue d May 2002 Module Removal and Replacement Printer Tray Assembly and Thermal printer Thermal Printer Replacement. To replace the Thermal Printer proceed as follows: 1. Position the Printer in the paper tray/print assembly so that the printer mounting plate lips slot into the dedicated cutouts in the assembly;…

• Page 61: Main Board Mk

  Chapter 4 SCHILLER AT-2plus 6-Channel ECG Unit Module Removal and Replacement SERVICE HANDBOOK Issue d May 2002 Main Board MK 14 — 10 Prerequisite • The Warnings and Cautions at the beginning of the chapter must be observed. • The top assembly must be removed and all external cable assemblies disconnected.

• Page 62: Battery Pack

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 4 SERVICE HANDBOOK Issue d May 2002 Module Removal and Replacement Battery Pack Prerequisite • The Warnings and Cautions at the beginning of the Chapter must be observed. • The Top Assembly must be removed and all external cable assemblies disconnected.

• Page 63: Keyboard

  Chapter 4 SCHILLER AT-2plus 6-Channel ECG Unit Module Removal and Replacement SERVICE HANDBOOK Issue d May 2002 Keyboard The keyboard comes as a complete assembly with the top casing. The part number of the keyboard is given in Chapter 6.

• Page 64: Lcd Screen Board

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 4 SERVICE HANDBOOK Issue d May 2002 Module Removal and Replacement LCD screen board Prerequisite • The Warnings and Cautions at the beginning of the Chapter must be observed. • The Top Assembly must be removed as detailed previously. All external cable assemblies must be disconnected.

• Page 65: Rs-232 Serial Interface Board Mk

  Chapter 4 SCHILLER AT-2plus 6-Channel ECG Unit Module Removal and Replacement SERVICE HANDBOOK Issue d May 2002 RS-232 Serial Interface Board MK 14 — 11 Prerequisite • The Warnings and Cautions at the beginning of the Chapter must be observed.

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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 5 SERVICE HANDBOOK Issue d May 2002 Adjustments Chapter 5 Adjustments Contents Introduction Safety Notices and Conditions Conditions Test Equipment Proprietary Test Equipment/Tools Main Board MK 14-10 Adjustment locations Battery Charge Voltage Precautions and Requirements…

• Page 67: Introduction

  Specific warnings and cautions are given in the text where applicable. The part numbers for all replaceable modules are given in Chapter 6. The AT-2plus has the following adjustments: • Battery Charge Voltage (VR1 on the main board MK 14-10) •…

• Page 68: Safety Notices And Conditions

  USE FORCE. NEVER STRAIN THE CABLE ASSEMBLIES. THE PROCEDURAL STEPS GIVEN FOR EACH MODULE MUST BE FOLLOWED IN THE ORDER GIVEN. THE OUTER SURFACES OF THE AT-2PLUS ARE SUSCEPTIBLE TO ABRASION DAMAGE. TO PREVENT SCRATCHING, ALWAYS PLACE ON A SOFT, NON-ABRASIVE CLOTH.

• Page 69: Test Equipment

  ECG Simulator, e.g. Phantom 320 • Oscilloscope • Digital Multimeter • Standard tool kit with a selection of cross-bladed, flat-bladed and posi-drive screwdrivers, pliers and general tools • SCHILLER 10 lead patient cable Number 2.400070 (2. 400071 for USA) Page 5.4…

• Page 70: Main Board Mk 14-10 Adjustment Locations

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 5 SERVICE HANDBOOK Issue d May 2002 Adjustments Main Board MK 14-10 Adjustment locations Page 5.5…

• Page 71: Battery Charge Voltage

  Battery Charge Voltage Precautions and Requirements The unit must be placed on an antistatic mat and antistatic precautions observed when any maintenance is carried out on the AT-2plus. The room temperature should be between 18 and 28 degrees. Tools and Equipment •…

• Page 72: Paper Mark Detector Check

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 5 SERVICE HANDBOOK Issue d May 2002 Adjustments Paper mark Detector Check Tools, Equipment and Material • Digital voltmeter • Small flat bladed screwdriver • 70% alcohol solution and clean lint free cloth Procedure To adjust the paper-mark Schmitt trigger sensitivity proceed as follows: •…

• Page 73: Ecg Amplifier +2V, -2V And Pwm Ramp Time Adjustment

  • DISCONNECT THE MAINS SUPPLY CAUTIONS THE AT-2PLUS CONTAINS STATIC SENSITIVE CMOS COMPONENTS; OBSERVE ANTISTATIC PRECAUTIONS . PLACE THE UNIT ON AN EARTHED ANTISTATIC MAT. PERSONNEL MUST BE EARTHED WHEN HANDLING THE UNIT. EXERCISE CARE WHEN REMOVING AND REPLACING CONNECTORS. NEVER USE FORCE.

• Page 74: Ecg Amplifier Reference Voltage

  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 5 SERVICE HANDBOOK Issue d May 2002 Adjustments ECG Amplifier reference voltage • Switch the unit on and measure the voltage difference between the +2V reference and the — 2V reference on pins 1 and 7 of operational amplifier U5. Adjust trimmer VR2 to achieve a voltage difference of 4000 mV ±2mV.

• Page 75: Service Screen

  Chapter 5 SCHILLER AT-2plus 6-Channel ECG Unit Adjustments SERVICE HANDBOOK Issue d May 2002 Service Screen The service screen provides information of the patient cable and electrodes and gives the value of certain reference voltages and important internal offset values. These values are for information only.

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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 5 SERVICE HANDBOOK Issue d May 2002 Adjustments Service Screen (cont.) Electrode dc offset This gives the voltage drop in the patient cable and can indicate any faults in the patient cable or patient electrode.

• Page 77: Software Options / Updates

  Acceptance of the code is indicated by a series of beeps. CAUTION MORE THAN 10 ATTEMPTS TO ENTER THE INCORRECT CODE BLOCKS THE UNIT Installing Software Updates To update the operating software in the AT-2plus see instructions in Chapter 1 of this book. Page 5.12…

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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 6 SERVICE HANDBOOK Issue d May 2002 Spare Parts Chapter 6 Spare Parts Contents Ordering Information Service Department Spare Parts Page 6.1…
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  Your local representative stocks all the disposables and accessories available for the AT-2plus. In case of difficulty or to obtain the address of your local dealer, please contact the head office. Our staff will be pleased to help process your order or to provide any details for all SCHILLER products.
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 6 SERVICE HANDBOOK Issue d May 2002 Spare Parts Spare Parts Description Part Number Mikroprocessor and power supply board MK 14-10 3.248 3BC Keyboard MK 14-3B 3.248 2BA RS-232 Interface board MK 14-11 3.248 5BA LCD Module 4.600 062…
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  Chapter 6 SCHILLER AT-2plus 6-Channel ECG Unit Spare Parts SERVICE HANDBOOK Issue d May 2002 Page 6.4…
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 7 SERVICE HANDBOOK Issue d May 2002 Technical Data Chapter 7 Technical Data Contents Technical Data Available Configurations Page 7.1…
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  Chapter 7 SCHILLER AT-2plus 6-Channel ECG Unit Technical Data SERVICE HANDBOOK Issue d May 2002 Technical Data Technical data subject to change without notice. Dimensions: 400 x 330 x 100 mm Weight: 5.0 kg ( 5.35 kg with full paper tray)
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  25 to 95% (non condensing) Atmospheric pressure: 700 to 1060 hPa Control Panel: Rubber keys Available Configurations The CARDIOVIT AT-2plus is available in several versions: Standard Version: Unit with ECG recording and printout capabilities. Version C: Unit with additional ECG Interpretation program (including measurements).
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  Chapter 7 SCHILLER AT-2plus 6-Channel ECG Unit Technical Data SERVICE HANDBOOK Issue d May 2002 Page 7.4…
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 8 SERVICE HANDBOOK Issue d May 2002 Glossary Chapter 8 Glossary Contents Introduction Acronyms Page 8.1…
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  The following list provides a glossary of the important signals and acronyms used in the circuit diagrams for the SCHILLER instruments. They will not all apply to the AT-2plus Memory. Only abbreviations that are specific to SCHILLER equipment are included here. General electrical and electronic abbreviations are not included.
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 8 SERVICE HANDBOOK Issue d May 2002 Glossary Acronyms ..OS Offset signal (on the ECG amplifier). A(1…n) CPU Address Bus ALBEEP Alarm beeper signal to the audio amplifier. The frequency of this signal is about 1000 Hz.
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  Chapter 8 SCHILLER AT-2plus 6-Channel ECG Unit Glossary SERVICE HANDBOOK Issue d May 2002 Acronyms DTACK Transfer data acknowledge. Bus signal to acknowledge transfer of data. Outgoing serial data, turns modem ON. ECGI ECG in — serial ECG data to the CPU sent over the optical interface.
• Page 90
  Motor ON — printer motor enable signal. NWTZ Mains supply. Non-maskable interrupt — interrupt for U47 (Schiller gate array) activated by the reset button. Off signal from the OFF key to switch off the power supply. Control signal derived from FLM (unity waveform 1/2 FLM frequency).
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  Upper column address strobe (for dynamic RAM). UD1, UD2 Upper data strobe — used for generating UOE and UWE. Upper data strobe — used on the Schiller gate array. UOE, USRAM Upper output enable — for static RAM. Page 8.6…
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  SCHILLER AT-2plus 6-Channel ECG Unit Chapter 8 SERVICE HANDBOOK Issue d May 2002 Glossary Acronyms Voltage rectified from the mains input and regulated to approximately +15 V. Upper write enable. Unregulated dc supply from mains (approximately 30V). +UBU Back-up voltage for the real time clock and static RAM.
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  Chapter 8 SCHILLER AT-2plus 6-Channel ECG Unit Glossary SERVICE HANDBOOK Issue d May 2002 Page 8.8…

SCHILLER AT-2plus 6-Channel ECG Unit

SERVICE HANDBOOK Issue d May 2002

AT-2plus

Memory

6-Channel ECG 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/

SCHILLER AT-2plus 6-Channel ECG Unit

SERVICE HANDBOOK Issue d May 2002

AT-2plus Memory Service Handbook

Article Number 2. 540014d

Associated Documents

© SCHILLERAG 2001

Windows™ is a trademark of Microsoft Corporation.

SCHILLER AT-2plus 6-Channel ECG Unit

SERVICE HANDBOOK Issue d May 2002

Where to Obtain Service

SCHILLER AT-2plus 6-Channel ECG Unit

SERVICE HANDBOOK Issue d May 2002

Warranty

Terms of Warranty

The SCHILLER AT-2plus Memory 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-2plus Memory 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.

SCHILLER AT-2plus 6-Channel ECG Unit

SERVICE HANDBOOK Issue d May 2002

Safety Notices

WARNINGS & CAUTIONS

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.

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.

SCHILLER AT-2plus 6-Channel ECG Unit

SERVICE HANDBOOK Issue d May 2002

Safety Notices

WARNINGS & CAUTIONS

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.

AN EXTERNAL DEVICE MUST ONLY BE CONNECTED USING THE ORIGINAL SCHILLER INTERFACE CABLE ASSEMBLY.

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.

SCHILLER AT-2plus 6-Channel ECG Unit

SERVICE HANDBOOK Issue d May 2002

What’s in this book

The service philosophy for the AT-2plus Memory 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-2plus Memory 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-2plus Memory. 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-2plus User Guide.

Chapter 2 — Functional Overview

This chapter provides a functional overview of the AT-2plus Memory. 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-2plus Memory 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.

SCHILLER AT-2plus 6-Channel ECG Unit

SERVICE HANDBOOK Issue d May 2002

What’s in this book

Chapter 7 — Technical Data

The full technical specification of the AT-2plus Memory 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-2plus Memory circuit diagrams.

Circuit Diagrams & Board layouts

The circuit diagrams and component layouts are provided for all boards. These details are provided for information only.

Chapter 1

Operating Elements

Introduction

The CARDIOVIT AT-2plus 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.

The AT-2plus 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

•Large, clear LCD for ECG preview prior to printing

•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

•Alphanumeric keyboard for patient data entry and clinical comments

List of Symbols

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 isa indicted on the top line of the LCD.

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 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 4 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-2plus 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-2plus 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.

The Keyboard

The Keyboard (cont.)

1Print extra copy — of Auto mode recording currently in memory. Press the ALT key first followed by this key to obtain a copy in Auto format 2.

2Display/enter patient data. When the patient data is displayed, pressing this key again returns to the ECG. Use the up/down arrows to go to the next data entry field.

In the `Born` (date of birth field), only the patients year of birth need be entered if desired. When two digits are entered (patients year of birth), the AT-2plus calculates the age of the patient according to the year entered. When the full DOB is entered, the age is calculated precisely.

3Myogram filter ON / OFF. The cutoff frequency can be defined and is detailed in `Settings`.

4.The top figures on the number keys designated > and < changes the lead group displayed on the screen.

5.Auto sensitivity key — automatically sets the ECG printout sensitivity ( in AUTO mode only) to the best setting for the signal strength (5mm/mV or 10mm/mV)

6.The top figures on the number keys designated 5, 10, and 20 set the sensitivity of the ECG both on the screen and on the (manual) printout. The sensitivity is 5, 10 or 20 mm / mV.

7.The top figures on the number keys designated 5/10, 25, and 50 set the speed of the ECG both on the screen and on the (manual) printout. The speed on the screen can only be set to 25 or 50 mm / s. The speed of the manual printout can be 5, 10, 25 or 50 mm/s. The 5 and 10 mm/s settings are both on the same key which toggles the two speeds.

8.The top character `QRS` toggles the QRS beeper ON/ OFF

9.Delete last typed character.

10.Switch the unit OFF.

11.Switch the unit ON.

12.Manual mode recording — start continuous printout of ECG — until STOP key pressed

13.Auto Mode recording (in Auto mode 1). Press ALT followed by the AUTO key for auto mode 2.

14.STOP printout / confirm (new) setting

15.ALT key — key for initiation of setups and selection of second format for printout and auto mode recording

16.In ECG mode use the UP/DOWN arrows to adjust screen contrast. When entering patient data use the LEFT/RIGHT arrow keys to move cursor in data field. Use the UP/DOWN arrow keys to go up/down to the next data entry

17.Mains Indicator — lit when mains connected.

Second letters on the keyboard — è, é, ç, ø are reached by holding the ALT key pressed before the letter key. Accents on a letter e.g. ô, ñ etc. are reached by pressing <SHIFT> and then the letter. In addition the following special characters are available (AT-2plus Memory only !):

LCD Screen

1.Current Heart Rate (averaged over 4 beats and refreshed every 2 seconds). The HR is also given on a manual printout. Note that with an auto mode printout the HR is averaged over the full 10 seconds of the recording.

2.Top line — Current Day, Date and Time Bottom Line — System messages

3.Top Line — Current power source — mains or battery. When battery capacity is limited the battery symbol flashes.

Bottom line — `ALT` in this box indicates that the ALT key has been pressed.

4.Electrode connections — when a lead flashes it indicates that the electrode resistance is too high. The electrode must be reapplied

5.Lead indication (leads currently displayed on the screen). Change the lead group with the keys `1` and `2`.

6.Myogram Filter indication — `Filter` = filter ON; no indication = filter OFF. Switch the filter on or off with the Filter key.

7.An `A` in this box indicates that automatic sensitivity is selected (auto mode printout only). Switch automatic sensitivity on or off with key `3`.

8.Sensitivity — 5, 10 or 20 mm/mV. Change the sensitivity with the keys `4`, `5`, and `6`.

AT-2plus Short Form Operating Instructions

Automatic ECG Recording

∙Prepare skin, hook up patient.

∙Switch unit on, press ON .

∙Press and enter patient data.

∙Press again and wait for at least 10 seconds until a clear and stable trace is displayed.

∙Press AUTO to record and print.

∙Press COPY for additional copies.

Manual ECG Recording (Rhythm Strip)

·Prepare skin, hook up patient.

∙Switch unit on, press ON .

∙Press MAN START .

∙ Press STOP to stop the printout.

Electrode hook-up check

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

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.

Lead format and chart speed can be programmed freely for each of the 2 formats before recording.

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:

For further information see paragraph `ECG Recording in Manual Mode` following.

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.

AUTO

When the AUTO SENSITIVITY key 3 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. 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 the AUTO key:

To start the automatic recording in the second format, press the ALT key followed by the AUTO key:

ALT +

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:

COPY

To obtain an extra printout of the second format, press the ALT 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

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, 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:

WARNING

AFTER HEAVY ARTEFACTS OR LEAD OFF, THE INDICATION OF THE HEART RATE MAY NOT BE RELIABLE.

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.

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 reset your AT-2plus to the basic default settings, the key sequence given on page 14 is ALT; 0; 6; 6. STOP.

On the following pages the programmable parameters and the programming sequences are described in detail.

Settings (cont.)

The defined formats and settings for your unit can be checked as follows:

ALT — 0 — 1 — 1

A printout of the defined settings will be produced and gives the following information, depending on the installed software:

Default Settings

To reset the unit to the basic default settings, proceed as follows:

ALT — 0 — 6 — 6

Settings (cont.)

Language

The language can only be set with the SWUP program.

User Identification

The user identification is printed on all recordings. The user ID can be the department, doctor or hospital etc. Enter the user ID as follows:

Press the ALT key followed by key 9, 3, 3

ALT — 9 — 3 — 3

The user entry field is displayed on the LCD. Enter up to 30 characters via the keyboard.

Confirm the new user ID by pressing the ENTER key.

Settings (cont.)

Filters

There are three different filters which can be set individually as follows:

•Baseline filter

•Mains filter

•Myogram filter

Baseline Filter

The digital Baseline filter suppresses excessive baseline drifts. The setting options are as follows:

Mains Filter

The Mains filter is an adaptive digital interference filter designed to suppress AC interference without attenuating or distorting the ECG.

Set the mains filter in accordance with the frequency of your local mains supply as follows:

Mains Filter

Settings (cont.)

Myogram Filter

The Myogram filter suppresses disturbances caused by strong muscle tremor. The set value will be the new upper limit of the frequency range as soon as the FILTER key is pressed on or programmed as default when the unit is switched on. When the Myogram filter is on `Filter` is displayed on the bottom line of the LCD.

Myogram Filter

Confirm the selection by pressing the STOP key

STOP

The myogram filter is switched on and off manually with the FILTER KEY

Settings (cont.)

Defining Lead Sequence & Printout

The required settings can be selected as follows:

Sequences, Print & Auto-centering

Confirm the selection by pressing the STOP key

The Standard and Cabrera lead groups available for the AT-2plus are:

Settings (cont.)

Acoustic QRS Indication

The acoustic QRS beep can be switched on or off at any time by pressing the QRS key

Time / Date

The required settings can be selected as follows:

Setting the Time and Date

Automatic Mode (ECG) Settings

Two separate Auto formats can be defined for the AT-2plus. When defining auto format 1 the key sequence ALT `1` precedes the setting. When defining auto format 2 the key sequence ALT `2` precedes the setting.

Automatic ECG Format

The automatic mode formats are detailed on the following pages. The ECG format is set as follows:

ECG Format

Automatic Mode (ECG) Settings (cont.)

Interpretation (C version only)

To print or suppress interpretation statements on the printout proceed as follows:

Interpretation (Interpretation Option Only)

Confirm the selection by pressing the STOP key

STOP

Full details of the interpretation option are given in the SCHILLER ECG Measurement and Interpretation booklet (Art. No. 2.510 179).

Interpretation Settings (C version only)

The interpretation settings enable the user to determine whether or not certain comments will be added to the interpretation statements on the ECG printout. Furthermore, the patient’s age can be defined (<30 or >30) and if low or high sensitivity should be applied. Low sensitivity will suppress certain nonspecific ECG diagnosis; this may be advisable when carrying out ECGs for screening.

SCHILLER AT-2plus 6-Channel ECG Unit

SERVICE HANDBOOK Issue d May 2002

What’s in this book

The service philosophy for the AT-2plus Memory 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-2plus

Memory 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-2plus Memory. 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-2plus User Guide.

Chapter 2 — Functional Overview

This chapter provides a functional overview of the AT-2plus Memory. 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-2plus Memory 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.

vii