Fluke 268XA Manuals

Manuals and User Guides for Fluke 268XA. We have 1 Fluke 268XA manual available for free PDF download: Service Manual

Fluke 268XA Service Manual

Fluke 268XA Service Manual (254 pages)

Data Acquisition System/Data Logging System

Brand: Fluke | Category: Data Loggers | Size: 6.59 MB

Table of Contents

Table of Contents
7
List of Tables
13
List of Figures
15
Introduction and Specifications

19
Theory of Operation

49
- Introduction
  51
- Communication Control System
  51
- 268XA Main Supply Circuit
  52
Chapter 2

53
- Main Power Supply
  53
- Secondary Supplies
  53
- Out-Guard Overview
  53
  - Microprocessor
    54
  - System Interface Unit
    54
  - Fpga
    55
  - Other Bus Devices
    56
  - FPGA Block Diagram
    56
  - Serial Devices
    57
  - Trigger In/Out, Master Alarm
    57
- PCMCIA Interface PCA (2686A-4041)
  58
- Backplane PCA (268XA-4001)
  58
  - Display Interface
    59
  - Module Interface
    59
- Module Power Supply PCA (268XA-4031)
  59
- Digital Input/Output PCA
  59
  - Microcontroller
    60
  - Data Input Threshold
    60
  - Digital Input Buffers
    61
  - Digital Output Drivers
    61
  - Relay Output Drivers
    61
  - Totalizer Input
    62
  - Totalizer Enable
    62
- A/D Theory of Operations
  62
  - A/D Converter PCA Block Description
    62
    
    Analog Measurement Processor
    63
    
    Input Protection
    63
    
    Input Signal Conditioning
    63
    
    Analog-To-Digital (A/D) Converter
    63
    
    Inguard Microcontroller
    63
    
    Channel Selection
    63
    
    Open Thermocouple Check
    64
  - Analog Input PCA Block Description
    64
    
    20-Channel Terminals
    64
    
    Reference Junction Temperature
    64
  - A/D Converter PCA Circuit Description
    64
    
    A3 A/D Converter Block Diagram
    65
    
    Function Relays
    66
    
    Input Protection
    66
    
    Input Signal Conditioning
    66
    
    Stallion Chip
    66
    
    Channel Selection Circuitry
    67
    
    DC Volts and Thermocouples Measurement Circuitry
    67
    
    DC Volts 300 V Range Simplified Schematic
    68
    
    Ohms and RTD Measurement Circuitry
    68
    
    RTD Measurement Simplified Schematic
    69
    
    AC Volts Measurement Circuitry
    70
    
    AC Volts #V Range Simplified Schematic
    71
    
    Frequency Measurements
    71
    
    Active Filter (ACV Filter)
    72
    
    Analog/Digital Converter Circuit
    72
    
    Autozero
    72
    
    Voltage Reference Circuit
    72
    
    Deintegrate1
    73
    
    Integrate
    73
    
    Integrator Output Wavefrom for Input Near + Full Scale
    74
    
    Deintegrate2
    75
    
    Inguard Digital Kernel Circuitry
    75
    
    Integrator Output Waveform for Input Near - Full Scale
    75
    
    Overhead
    75
    
    Open Thermocouple Detect Circuitry
    76
  - A4 Analog Input PCA Circuit Description
    76
  - A31 A/D Power Supply Circuit Description
    77
  - Controller/System Power (Outguard) to A3 A/D Converter (Inguard) Communications
    77
  - Special Codes
    77
  - Resets
    77
  - Commands
    78
    
    Perform Scan
    78
    
    Perform Self-Test
    79
    
    Return Firmware Version
    79
    
    Return Boot Firmware Version
    79
    
    Set Global Configuration
    80
    
    Set Channel Configuration
    80
    
    Do Housekeeping
    80
  - Checksums
    81
  - Errors
    81
  - Power-Up Protocol
    81
  - Inguard Unresponsive
    81
  - Inguard Software Description
    81
  - Hardware Elements
    82
    
    Channel MUX
    82
    
    Function Relays
    83
    
    Stallion Chip and Signal Conditioning
    84
    
    A/D
    87
    
    DISCHARGE Signal
    90
    
    Open-Thermocouple Detector
    90
  - Channel Measurements
    90
    
    Reading Rates
    90
    
    Measurement Types
    91
    
    Autoranging
    93
    
    Overload
    93
  - Housekeeping Readings
    93
    
    Reading Types
    93
    
    Housekeeping Schedule
    94
  - Self-Tests
    95
    
    Power-Up Self-Tests
    95
    
    Self-Test Command
    95
Maintenance

97
Chapter 3

99
- Introduction
  99
- Self-Test Diagnostics and Error Codes
  99
- Cleaning
  102
- AC Fuse Replacement
  103
- Replacing the Fuse
  103
- DC Fuse Replacement
  104
- DC Fuse Location
  105
Performance Verification

107
- Introduction
  109
Chapter 4

109
- Configuring the Performance Test Setup
  109
- Initializing the Performance Test Setup
  111
- Connection between Device and Host
  111
- Accuracy Performance Tests
  112
  - Master Alarm Output Tests
    113
    
    RS-232 Master Alarm Output Test
    113
    
    Fluke DAQ Master Alarm Output Test
    113
  - Trigger Input Tests
    113
    
    RS-232 Trigger Input Test
    113
    
    Fluke DAQ Trigger Input Test
    114
  - Trigger Output Tests
    114
    
    RS-232 Trigger Output Test
    114
    
    Fluke DAQ Trigger Output Test
    114
  - Volts DC Accuracy Test (PAI Module)
    115
  - Volts DC Accuracy Test (FAI Module)
    116
  - Volts AC Accuracy Test
    117
  - Frequency Accuracy Test
    117
  - Analog Channel Integrity Test
    118
  - Open Thermocouple Response Test
    118
  - 2-Wire Resistance Accuracy Test (PAI) - Optional
    119
  - 2-Wire Resistance Accuracy Test (FAI Module) - Optional
    120
  - 4-Wire Resistance Accuracy Test (PAI Module)
    122
  - 4-Wire Resistance Accuracy Test (FAI Module)
    125
  - Digital Input/Output Tests
    126
    
    RS-232 Digital Input/Output Test
    126
    
    DIO Connector Module
    126
    
    Fluke DAQ Digital Input/Output Test
    127
  - DIO Relay/Fuse Tests
    127
    
    RS-232 DIO Relay Fuse Test
    127
    
    Fluke DAQ DIO Relay Fuse Test
    127
  - Totalizer Tests
    128
    
    RS-232 Totalizer Count Test
    128
    
    RS-232 Totalizer Count and Enable Test
    128
    
    RS-232 Totalizer Count and Direction Test
    128
    
    RS-232 Totalizer Count and Debounce Test
    129
    
    Fluke DAQ Totalizer Count Test
    129
    
    Fluke DAQ Totalizer Count and Enable Test
    129
    
    Fluke DAQ Totalizer Count and Direction Test
    130
    
    Fluke DAQ Totalizer Count and Debounce Test
    130
Calibration

131
Chapter 5

133
- Introduction
  133
- Calibration
  133
- Methods of Calibration
  133
- Preparing for Calibration
  133
- Device and Host Computer Calibration Setup
  135
- Universal Input Module Calibration Connections
  135
- Ending Calibration
  136
- RS-232 Device Configuration Parameters
  136
- Two-Wire Calibration Connection
  136
- Manual Calibration Procedure
  137
- Four-Wire Calibration Connection
  137
- Manual Calibration Commands
  139
  - DC Calibration Procedure
    140
  - AC Calibration Procedure
    142
  - Resistance Calibration Procedure
    143
  - Frequency Calibration Procedure
    145
Diagnostic Testing and Troubleshooting

147
Chapter 6

149
- Introduction
  149
- Servicing Surface-Mount Assemblies
  149
- Error Detection
  150
  - FLASH ROM Parameter Defaults
    153
  - Background Testing
    153
  - Retrieving Error Codes Using RS-232
    154
- Selecting the Diagnostic Tools
  154
  - Diagnostic Tool Dio
    154
  - Diagnostic Tool Relay
    155
  - Diagnostic Tool Ids
    155
  - Diagnostic Tool Conf
    156
  - Diagnostic Display Test
    157
  - COMM Parameter Reset
    157
- Using the RS-232 Interface
  157
  - Command Processing
    157
  - Device Configuration
    158
  - Command Set
    159
- Troubleshooting the Device
  171
  - General Troubleshooting
    171
  - Sys/Ctrl PCA Troubleshooting
    182
    
    Troubleshooting the Sys/Ctrl PCA Digital Kernel
    182
    
    Troubleshooting the RS-232 Interface
    182
    
    Troubleshooting the Ethernet Interface
    183
    
    Troubleshooting the Keypad, Master Alarm Output, Trigger Input, and Trigger out Lines
    183
    
    Troubleshooting the Power Supply
    183
  - A2 Display PCA Troubleshooting
    183
    
    Display Test Pattern #1
    184
    
    Display Test Pattern #2
    184
    
    Variations in the Display
    185
  - PCMCIA PCA Troubleshooting
    186
  - A/D Power Supply PCA Troubleshooting
    186
  - DIO Module Troubleshooting
    186
    
    Digital Input Buffers
    187
    
    Digital Output Drivers
    187
    
    Relay Output Drivers
    187
    
    Totalizer Input
    188
    
    Totalizer Enable
    188
  - Digital Output PCA Troubleshooting
    188
  - A3 A/D Converter Module Troubleshooting
    188
    
    A3 Kernel
    188
    
    Break/Reset Circuit
    189
    
    Out of Tolerance Readings
    189
    
    Troubleshooting Relay Problems
    190
  - A4 Analog Input PCA Troubleshooting
    190
- Troubleshooting Calibration Failures
  190
  - Retrieving Calibration Constants
    191
- Flukedaq Software
  193
Replaceable Parts

195
- Introduction
  197
- How to Obtain Parts
  197
- Service Centers
  197
- Parts Lists
  198
- 268XA Final Assembly
  204
- Blank Module
  205
- DIO Module
  206
- FAI Module
  208
- PAI Module
  210
- Isothermal Input
  212
Figure Title Page

213
Schematics

213
- Backplane PCA
  215
- Controller/System Power PCA
  217
- Digital I/O PCA
  223
- Backplane Extender PCA
  227
- Extender PCA
  229
- A/D Supply Assembly
  231
- Pcmcia Pca
  233
- Output PCA
  235
- Analog Input Connector PCA
  251
- Display PCA
  253

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