Equipment information:

Fluke 268XA Other
Manufacturer:
Fluke
Model: 268XA
Date: 2002
Category: Measurement instruments
Group: Other
Description: Data Acquisition System/Data Logging System
Information:
                                    The 2686A comes with a removable PC Card (PCMCIA) for
stand-alone storage
operation. This socket accepts ATA memory cards up to 2 GB
in size.
Each 268XA device can hold from 1 to 6 analog modules. These
modules are the
Precision Analog module (PAI), Fast Analog module (FAI), and
the Digital IO/Relay and
Totalizer module (DIO). These modules are all isolated from
one another. You can add
the DIO module to the device in slot 6 only.
The analog modules measure dc volts, ac volts, ohms,
temperature, frequency, and dc
current. Temperature measurements use thermocouples,
thermistors or resistance
temperature detectors (RTDs). The devices also have
extensive computed math
capability. Besides using data collected from the analog
modules and digital totalizer,
time can also be used in computed channel calculations.
The system scans 20 to 120 analog channels and calculates
the values for up to 60
computed channels. Interval timers, alarm conditions, and/or
an external signal input can
trigger scans. The Fluke DAQ software configures and
controls up to 99 268XA devices
via an Ethernet connection. The software provides the means
to view scan data and log it
into files.
The analog modules that may be used with the 268XA are the
FAI module and the PAI
module. The PAI modules emphasize precision with 5 ½ digits
of resolution, .02%
accuracy, and can withstand up to 150 V common mode voltage
(300 V on channels 1
and 11). The FAI modules emphasize increased measurement
speed with 4 ½ digits of
resolution, 0.04% accuracy, and can withstand up to 50 V
common mode voltage. Device
specifications are provided later in this chapter.

These manuals are available for the above equipment:

Fluke -- 268XA -- Service Manual
File name: Fluke-6521-Manual-Page-1-Picture
Manual Type: Service Manual
Pages: 254
Size: 6.28 Mbytes (6585182 Bytes)
Language: english
Revision:
Manual-ID/Number: PN 1883791
Date: November 2002
Quality: Electronic document, no scan, very well readable.
Upload date:
MD5: 74fef15ba400518f1b68f189f002e7bd
ed2kID: 6831411308d23966ac90347d642d9f5e
Downloads: 58 since 29 November 2014
Information:
1 Introduction and
Specifications........................................................
1-1
Introduction
.......................................................................................................
1-3
Block Diagrams
.................................................................................................
1-5
Specifications
....................................................................................................
1-7
2680A/2686A Combined
Specifications.......................................................
1-7
2680A/2686A General Specifications
...............................................................
1-8
Real-Time Clock and Calendar
.........................................................................
1-9
Trigger In Specifications
...................................................................................
1-9
Trigger Out Specifications
................................................................................
1-9
Master Alarm Output
Specification...................................................................
1-10
Communication
I/O...........................................................................................
1-10
2686A PC Card Storage
....................................................................................
1-10
Precision Analog Input (PAI) A/D
Specifications............................................. 1-11
Specifications PAI A/D DC Voltage Measurement
...................................... 1-11
PAI A/D AC Voltage Measurement
Specifications...................................... 1-13
PAI A/D 4-Wire Resistance Measurement
Specifications............................ 1-15
PAI A/D 2-Wire Resistance Measurement
Specifications............................ 1-16
PAI A/D 4-Wire RTD per ITS-1990 Measurement Specifications
.............. 1-16
PAI A/D 2-Wire RTD per ITS-1990 Measurement Specifications
.............. 1-16
PAI A/D Thermocouple per ITS-1990 Measurement
Specifications............ 1-17
PAI A/D Frequency Measurement Specifications
........................................ 1-20
Fast Analog Input (FAI) A/D
Specifications.....................................................
1-21
FAI A/D DC Voltage Measurement
Specifications...................................... 1-21
FAI A/D AC Voltage Measurement
Specifications...................................... 1-22
FAI A/D 4-Wire Resistance Measurement
Specifications............................ 1-24
FAI A/D 2-Wire Resistance Measurement
Specifications............................ 1-25
FAI A/D 4-Wire RTD per ITS-1990 Measurement Specifications
.............. 1-25
FAI A/D Thermocouple per ITS-1990 Measurement
Specifications............ 1-26
FAI A/D Frequency Measurement Specifications
........................................ 1-28
Digital Input/Output
Module.............................................................................
1-29
Digital Input/Output Specifications
..............................................................
1-29
Totalizer Input Specifications
.......................................................................
1-30
Digital Relay
Specifications..........................................................................
1-30
Options and
Accessories....................................................................................
1-31
2 Theory of
Operation...........................................................................
2-1
Introduction
.......................................................................................................
2-3
Main Power
Supply.......................................................................................
2-5
Secondary Supplies
.......................................................................................
2-5
Out-Guard
Overview.....................................................................................
2-5
Microprocessor
.........................................................................................
2-6
FPGA........................................................................................................
2-7
Other Bus Devices
....................................................................................
2-8
Serial Devices
...........................................................................................
2-9
Trigger In/Out, Master
Alarm...................................................................
2-9
PCMCIA Interface PCA (2686A-4041)
............................................................
2-10
Backplane PCA
(268XA-4001).........................................................................
2-10
Display Interface
...........................................................................................
2-11
Module Interface
...........................................................................................
2-11
Module Power Supply PCA
(268XA-4031)......................................................
2-11
Digital Input/Output
PCA..................................................................................
2-11
Microcontroller
.............................................................................................
2-12
Data Input
Threshold.....................................................................................
2-12
Digital Input Buffers
.....................................................................................
2-13
Digital Output
Drivers...................................................................................
2-13
Relay Output Drivers
....................................................................................
2-13
Totalizer
Input...............................................................................................
2-14
Totalizer Enable
............................................................................................
2-14
A/D Theory of
Operations.................................................................................
2-14
A/D Converter PCA Block Description
........................................................ 2-14
Analog Measurement Processor
...............................................................
2-15
Input
Protection.........................................................................................
2-15
Input Signal
Conditioning.........................................................................
2-15
Analog-to-Digital (a/d) Converter
............................................................
2-15
Inguard
Microcontroller............................................................................
2-15
Channel Selection
.....................................................................................
2-15
Open Thermocouple Check
......................................................................
2-16
Analog Input PCA Block
Description...........................................................
2-16
20-Channel
Terminals...............................................................................
2-16
Reference Junction Temperature
..............................................................
2-16
A/D Converter PCA Circuit Description
...................................................... 2-16
Stallion Chip
.............................................................................................
2-18
Input
Protection.........................................................................................
2-18
Input Signal
Conditioning.........................................................................
2-18
Function Relays
........................................................................................
2-18
Channel Selection
Circuitry......................................................................
2-19
DC Volts and Thermocouples Measurement
Circuitry............................. 2-19
Ohms and RTD Measurement
Circuitry...................................................
2-20
AC Volts Measurement Circuitry.
............................................................
2-22
Frequency Measurements
.........................................................................
2-23
Active Filter (ACV Filter)
........................................................................
2-24
Voltage Reference Circuit
........................................................................
2-24
Analog/Digital Converter Circuit
............................................................. 2-24
Autozero
...................................................................................................
2-24
Integrate
....................................................................................................
2-25
Deintegrate1..............................................................................................
2-25
Deintegrate2..............................................................................................
2-27
Overhead...................................................................................................
2-27
Inguard Digital Kernel
Circuitry...............................................................
2-27
A4 Analog Input PCA Circuit Description
................................................... 2-28
A31 A/D Power Supply Circuit
Description.................................................
2-29
Controller/System Power (Outguard) to A3 A/D Converter (Inguard)
Communications
...........................................................................................
2-29
Special Codes
................................................................................................
2-29
Resets
............................................................................................................
2-29
Commands.....................................................................................................
2-30
Perform
Scan.............................................................................................
2-30
Perform
Self-Test......................................................................................
2-31
Return Firmware Version
.........................................................................
2-31
Return Boot Firmware
Version.................................................................
2-31
Set Global Configuration
..........................................................................
2-32
Set Channel
Configuration........................................................................
2-32
Do
Housekeeping......................................................................................
2-32
Checksums
....................................................................................................
2-33
Errors.............................................................................................................
2-33
Power-Up
Protocol........................................................................................
2-33
Inguard Unresponsive
...................................................................................
2-33
Inguard Software Description
.......................................................................
2-33
Hardware Elements
.......................................................................................
2-34
Channel
MUX...........................................................................................
2-34
Function Relays
........................................................................................
2-35
Stallion Chip and Signal Conditioning
..................................................... 2-36
A/D
...........................................................................................................
2-39
DISCHARGE Signal
................................................................................
2-42
Open-Thermocouple Detector
..................................................................
2-42
Channel Measurements
.................................................................................
2-42
Reading Rates
...........................................................................................
2-42
Measurement
Types..................................................................................
2-43
Autoranging
..............................................................................................
2-45
Overload
...................................................................................................
2-45
Housekeeping Readings
................................................................................
2-45
Reading Types
..........................................................................................
2-45
Housekeeping
Schedule............................................................................
2-46
Self-Tests.......................................................................................................
2-47
Power-Up Self-Tests
.................................................................................
2-47
Self-Test Command
..................................................................................
2-47
3 Maintenance
.......................................................................................
3-1
Introduction
.......................................................................................................
3-3
Self-Test Diagnostics and Error Codes
............................................................. 3-3
Cleaning.............................................................................................................
3-6
AC Fuse Replacement
.......................................................................................
3-7
DC Fuse Replacement
.......................................................................................
3-8
4 Performance
Verification...................................................................
4-1
Introduction
.......................................................................................................
4-3
Configuring the Performance Test Setup
...................................................... 4-3
Initializing the Performance Test Setup
........................................................ 4-5
Accuracy Performance Tests
.............................................................................
4-6
Master Alarm Output Tests
...........................................................................
4-7
RS-232 Master Alarm Output Test
........................................................... 4-7
Fluke DAQ Master Alarm Output Test
.................................................... 4-7
Trigger Input
Tests........................................................................................
4-7
RS-232 Trigger Input Test
........................................................................
4-7
Fluke DAQ Trigger Input Test
.................................................................
4-8
Trigger Output Tests
.....................................................................................
4-8
RS-232 Trigger Output Test
.....................................................................
4-8
Fluke DAQ Trigger Output
Test...............................................................
4-8
Volts DC Accuracy Test (PAI
Module)........................................................
4-9
Volts DC Accuracy Test (FAI
Module)........................................................
4-10
Volts AC Accuracy Test
...............................................................................
4-11
Frequency Accuracy
Test..............................................................................
4-11
Analog Channel Integrity Test
......................................................................
4-12
Open Thermocouple Response
Test..............................................................
4-12
2-Wire Resistance Accuracy Test (PAI) -
Optional...................................... 4-13
2-Wire Resistance Accuracy Test (FAI Module) - Optional
........................ 4-14
4-Wire Resistance Accuracy Test (PAI
Module).......................................... 4-16
4-Wire Resistance Accuracy Test (FAI
Module).......................................... 4-19
Digital Input/Output
Tests.............................................................................
4-20
RS-232 Digital Input/Output
Test.............................................................
4-20
Fluke DAQ Digital Input/Output Test
...................................................... 4-21
DIO Relay/Fuse Tests
...................................................................................
4-21
RS-232 DIO Relay Fuse Test
...................................................................
4-21
Fluke DAQ DIO Relay Fuse
Test.............................................................
4-21
Totalizer
Tests...............................................................................................
4-22
RS-232 Totalizer Count Test
....................................................................
4-22
RS-232 Totalizer Count and Enable Test
................................................. 4-22
RS-232 Totalizer Count and Direction Test
............................................. 4-22
RS-232 Totalizer Count and Debounce Test
............................................ 4-23
Fluke DAQ Totalizer Count
Test..............................................................
4-23
Fluke DAQ Totalizer Count and Enable
Test........................................... 4-23
Fluke DAQ Totalizer Count and Direction
Test....................................... 4-24
Fluke DAQ Totalizer Count and Debounce
Test...................................... 4-24
5
Calibration..........................................................................................
5-1
Introduction
.......................................................................................................
5-3
Calibration
.........................................................................................................
5-3
Methods of
Calibration......................................................................................
5-3
Preparing for Calibration
...................................................................................
5-3
Ending
Calibration.............................................................................................
5-6
RS-232 Device Configuration Parameters
........................................................ 5-6
Manual Calibration
Procedure...........................................................................
5-7
Manual Calibration
Commands.........................................................................
5-9
V DC Calibration Procedure
.........................................................................
5-10
V AC Calibration Procedure
.........................................................................
5-12
Resistance Calibration
Procedure..................................................................
5-13
Frequency Calibration
Procedure..................................................................
5-15
6 Diagnostic Testing and
Troubleshooting......................................... 6-1
Introduction
.......................................................................................................
6-3
Servicing Surface-Mount Assemblies
...............................................................
6-3
Error Detection
..................................................................................................
6-4
FLASH ROM Parameter Defaults
................................................................
6-7
Background Testing
......................................................................................
6-7
Retrieving Error Codes using
RS-232...........................................................
6-8
Selecting the Diagnostic Tools
..........................................................................
6-8
Diagnostic Tool
dio.......................................................................................
6-8
Diagnostic Tool
rELAy.................................................................................
6-9
Diagnostic Tool
idS.......................................................................................
6-9
Diagnostic Tool
conF....................................................................................
6-10
Diagnostic Display Test
................................................................................
6-11
COMM Parameter Reset
...............................................................................
6-11
Using the RS-232 Interface
...............................................................................
6-11
Command
Processing....................................................................................
6-11
Device Configuration
....................................................................................
6-12
Command Set
................................................................................................
6-13
Troubleshooting the
Device...............................................................................
6-25
General
Troubleshooting...............................................................................
6-25
Sys/Ctrl PCA
Troubleshooting......................................................................
6-36
Troubleshooting the Sys/Ctrl PCA Digital Kernel
................................... 6-36
Troubleshooting the RS-232
Interface......................................................
6-36
Troubleshooting the Ethernet Interface
.................................................... 6-37
Troubleshooting the Keypad, Master Alarm Output, Trigger Input,
and Trigger Out
Lines...............................................................................
6-37
Troubleshooting the Power
Supply...........................................................
6-37
A2 Display PCA Troubleshooting
................................................................
6-37
Variations in the Display
..........................................................................
6-39
PCMCIA PCA Troubleshooting
...................................................................
6-40
A/D Power Supply PCA Troubleshooting
.................................................... 6-40
DIO Module
Troubleshooting.......................................................................
6-40
Digital Input
Buffers.................................................................................
6-41
Digital Output Drivers
..............................................................................
6-41
Relay Output Drivers
................................................................................
6-41
Totalizer
Input...........................................................................................
6-42
Totalizer
Enable........................................................................................
6-42
Digital Output PCA Troubleshooting
........................................................... 6-42
A3 A/D Converter Module Troubleshooting
................................................ 6-42
A3
Kernel..................................................................................................
6-42
Break/Reset
Circuit...................................................................................
6-43
Out of Tolerance Readings
.......................................................................
6-43
Troubleshooting Relay
Problems..............................................................
6-44
A4 Analog Input PCA
Troubleshooting........................................................
6-44
Troubleshooting Calibration
Failures................................................................
6-44
Retrieving Calibration Constants
..................................................................
6-45
FlukeDAQ
Software..........................................................................................
6-47
7 Replaceable Parts
..............................................................................
7-1
Introduction
.......................................................................................................
7-3
How to Obtain Parts
..........................................................................................
7-3
Service
Centers..................................................................................................
7-3
Parts Lists
..........................................................................................................
7-4
8
Schematics.........................................................................................
8-1
Introduction
.......................................................................................................
8-3
Fluke-6521-Manual-Page-1-Picture
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