National Instruments SCXI-1520 User Manual
TM
SCXI
SCXI-1520 User Manual
SCXI-1520 User Manual
May 2009
372583E-01
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Conventions
The following conventions are used in this manual:
<> Angle brackets that contain numbers separated by an ellipsis represent a
range of values associated with a bit or signal name—for example,
AO <3. .0>.
» The » symbol leads you through nested menu items and dialog box options
to a final action. The sequence File»Page Setup»Options directs you to
pull down the File menu, select the Page Setup item, and select Options
from the last dialog box.
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This icon denotes a caution, which advises you of precautions to take to
avoid injury, data loss, or a system crash. When this symbol is marked on a
product, refer to the Read Me First: Safety and Radio-Frequency
Interference for information about precautions to take.
bold Bold text denotes items that you must select or click in the software, such
as menu items and dialog box options. Bold text also denotes parameter
names.
italic Italic text denotes variables, emphasis, a cross-reference, or an introduction
to a key concept. Italic text also denotes text that is a placeholder for a word
or value that you must supply.
monospace Text in this font denotes text or characters that you should enter from the
keyboard, sections of code, programming examples, and syntax examples.
This font is also used for the proper names of disk drives, paths, directories,
programs, subprograms, subroutines, device names, functions, operations,
variables, filenames, and extensions.
monospace bold Bold text in this font denotes the messages and responses that the computer
automatically prints to the screen. This font also emphasizes lines of code
that are different from the other examples.
monospace italic
Italic text in this font denotes text that is a placeholder for a word or value
that you must supply.
Contents
Chapter 1
About the SCXI-1520
What You Need to Get Started ......................................................................................1-1
National Instruments Documentation ............................................................................1-3
Installing Application Software, NI-DAQ, and the E/M Series DAQ Device .............. 1-5
Installing the SCXI-1520 Module into the SCXI Chassis...............................1-5
Connecting the SCXI-1520 in an SCXI Chassis to an E/M Series
DAQ Device for Multiplexed Scanning .......................................................1-5
Connecting the SCXI-1520 in a PXI/SCXI Combination Chassis to an
E/M Series DAQ Device for Multiplexed Scanning ....................................1-5
Verifying the SCXI-1520 Installation in Software ........................................................1-6
Installing SCXI Using NI-DAQmx in Software .............................................1-6
Manually Adding Modules in NI-DAQmx .....................................................1-6
Installing SCXI Using Traditional NI-DAQ (Legacy) in Software ................ 1-6
Manually Adding Modules in Traditional NI-DAQ (Legacy) ........................1-6
Verifying and Self-Testing the Installation .....................................................1-6
Troubleshooting the Self-Test Verification ...................................................................1-7
Troubleshooting in NI-DAQmx ......................................................................1-7
Troubleshooting in Traditional NI-DAQ (Legacy) ......................................... 1-8
Chapter 2
Connecting Signals
Connecting Bridge Sensor Signals ................................................................................ 2-1
Quarter-Bridge Type I .....................................................................................2-1
Quarter-Bridge Type II....................................................................................2-2
Half-Bridge Type I ..........................................................................................2-4
Half-Bridge Type II.........................................................................................2-5
Full-Bridge Type I...........................................................................................2-6
Full-Bridge Type II.......................................................................................... 2-7
Full-Bridge Type III ........................................................................................2-8
Remote Sense ..................................................................................................2-9
Pin Assignments ............................................................................................................2-10
© National Instruments Corporation v SCXI-1520 User Manual
Contents
Chapter 3
Configuring and Testing
SCXI-1520 Software-Configurable Settings .................................................................3-1
Common Software-Configurable Settings ...................................................... 3-1
Bridge Configuration........................................................................ 3-1
Excitation Level................................................................................ 3-2
Filter Bandwidth ............................................................................... 3-2
Gain/Input Range.............................................................................. 3-3
Null Potentiometers .......................................................................... 3-4
Shunt Calibration Switches .............................................................. 3-4
Modes of Operation .......................................................................... 3-5
Simultaneous Sample and Hold........................................................ 3-5
Configurable Settings in MAX...................................................................................... 3-5
NI-DAQmx ..................................................................................................... 3-6
Creating a Strain Global Channel or Task........................................ 3-7
Creating a Custom Voltage with Excitation Global Channel
or Task ........................................................................................... 3-8
Traditional NI-DAQ (Legacy) ........................................................................ 3-9
Configuring Module Property Pages in Traditional NI-DAQ
(Legacy)......................................................................................... 3-10
Creating a Strain Virtual Channel .................................................... 3-11
Calibrating a Strain Virtual Channel ................................................ 3-11
Verifying the Signal ...................................................................................................... 3-12
Verifying the Signal in NI-DAQmx Using a Task or Global Channel........... 3-12
Verifying the Signal in Traditional NI-DAQ (Legacy) .................................. 3-13
Verifying the Signal Using Channel Strings .................................... 3-13
Verifying the Signal Using Strain Virtual Channel .......................... 3-14
Using the Strain Calibration Wizard in NI-DAQmx..................................................... 3-14
Chapter 4
Theory of Operation
Strain-Gauge Theory ..................................................................................................... 4-1
Wheatstone Bridges ........................................................................................ 4-1
Strain Gauges .................................................................................................. 4-2
Acronyms, Formulas, and Variable Definitions ............................................. 4-3
Software Scaling and Equations ..................................................................... 4-4
Quarter-Bridge Type I..................................................................................... 4-4
Quarter-Bridge Type II ................................................................................... 4-6
Half-Bridge Type I.......................................................................................... 4-9
Half-Bridge Type II ........................................................................................ 4-11
Full-Bridge Type I .......................................................................................... 4-13
SCXI-1520 User Manual vi ni.com
Full-Bridge Type II.......................................................................................... 4-14
Full-Bridge Type III ........................................................................................4-16
SCXI-1520 Theory of Operation ...................................................................................4-18
Bridge Configuration and Completion ............................................................4-21
Excitation.........................................................................................................4-22
Remote Sense....................................................................................4-23
Gain ................................................................................................................. 4-24
Filter Bandwidth and Cutoff Frequency..........................................................4-25
Offset Null Compensation...............................................................................4-25
Shunt Calibration.............................................................................................4-27
Simultaneous Sample and Hold.......................................................................4-28
Maximum Simultaneous Sample and Hold Sample Rate Using
Maximum Simultaneous Sample and Hold Using Traditional
Modes of Operation......................................................................................... 4-34
Theory of Multiplexed Mode Operation ...........................................4-34
Theory of Parallel Mode Operation ..................................................4-35
Chapter 5
Using the SCXI-1520
Developing Your Application in NI-DAQmx ...............................................................5-1
Typical Program Flowchart.............................................................................5-2
General Discussion of Typical Flowchart .......................................................5-4
Creating a Task Using DAQ Assistant or Programmatically ...........5-4
Adjusting Timing and Triggering ..................................................... 5-4
Configuring Channel Properties........................................................5-5
Performing Offset Null Compensation .............................................5-7
Performing Shunt Calibration ...........................................................5-8
Acquiring, Analyzing, and Presenting ..............................................5-8
Completing the Application .............................................................. 5-9
Developing an Application Using LabVIEW..................................................5-9
Using a DAQmx Channel Property Node in LabVIEW ...................5-11
Specifying Channel Strings in NI-DAQmx.....................................................5-12
Text Based ADEs..............................................................................5-14
Measurement Studio (Visual Basic, .NET, and C#)........................................5-14
Programmable NI-DAQmx Properties..............................................5-16
Developing Your Application in Traditional NI-DAQ (Legacy) ..................................5-18
Traditional NI-DAQ (Legacy) in LabVIEW................................................... 5-19
Typical Program Flow ......................................................................5-20
Configuring the SCXI-1520 Settings Using Traditional NI-DAQ
(Legacy) in LabVIEW ..................................................................................5-22
Contents
NI-DAQmx ....................................................................................4-30
NI-DAQ (Legacy) ..........................................................................4-32
© National Instruments Corporation vii SCXI-1520 User Manual
Contents
Performing Offset Null Compensation Using Traditional NI-DAQ
(Legacy) in LabVIEW.................................................................................. 5-24
Performing Shunt Calibration Using Traditional NI-DAQ (Legacy)
in LabVIEW ................................................................................................. 5-26
Configure, Start Acquisition, and Take Readings Using Traditional
NI-DAQ (Legacy) in LabVIEW .................................................................. 5-27
Converting Scaling Using Traditional NI-DAQ (Legacy) in LabVIEW ........ 5-27
Analyze and Display Using Traditional NI-DAQ (Legacy) in LabVIEW ..... 5-28
Traditional NI-DAQ (Legacy) in Text-Based ADEs ...................................... 5-28
Low-Level DAQ Functions ............................................................................ 5-29
Configuring System Settings Using Traditional NI-DAQ (Legacy) C API ... 5-31
Configuring Module Settings Using Traditional NI-DAQ (Legacy) C API... 5-32
Performing Offset Null Compensation Using Traditional NI-DAQ
(Legacy) C API ............................................................................................ 5-34
Performing Shunt Calibration Using Traditional NI-DAQ
(Legacy) C API ............................................................................................ 5-34
Performing Acquisition Using Traditional NI-DAQ (Legacy) C API............ 5-35
Performing Scaling, Analysis, and Display .................................................... 5-35
Other Application Documentation and Material ........................................................... 5-36
Traditional NI-DAQ (Legacy) CVI Examples................................................ 5-36
Traditional NI-DAQ (Legacy) Measurement Studio Examples ..................... 5-36
Calibrating the Strain System........................................................................................ 5-37
Calibrating the SCXI-1520 ............................................................................. 5-37
Internal Calibration Procedure.......................................................... 5-37
Internal Calibration Using LabVIEW............................................... 5-37
Internal Calibration Using a C-Based ADE ..................................... 5-38
External Calibration.......................................................................... 5-38
Calibrating the System .................................................................................... 5-39
Offset Null Compensation ................................................................ 5-39
Shunt Calibration.............................................................................. 5-39
Appendix A
Specifications
Appendix B
Using SCXI Channel Strings with Traditional NI-DAQ (Legacy) 7.0
or Later
Appendix C
Removing the SCXI-1520
SCXI-1520 User Manual viii ni.com
Appendix D
Common Questions
Glossary
Index
Figures
Figure 2-1. Quarter-Bridge I Circuit Diagram .........................................................2-2
Figure 2-2. Quarter-Bridge II Circuit Diagram........................................................2-3
Figure 2-3. Half-Bridge Type I Circuit Diagram .....................................................2-4
Figure 2-4. Half-Bridge Type II Circuit Diagram....................................................2-5
Figure 2-5. Full-Bridge Type I Circuit Diagram......................................................2-6
Figure 2-6. Full-Bridge Type II Circuit Diagram ....................................................2-7
Figure 2-7. Full-Bridge Type III Circuit Diagram ...................................................2-8
Figure 2-8. Remote-Sense Circuit Diagram.............................................................2-9
Figure 4-1. Basic Wheatstone Bridge Circuit Diagram ...........................................4-1
Figure 4-2. Quarter-Bridge Type I Measuring Axial and Bending Strain ...............4-4
Figure 4-3. Quarter-Bridge I Circuit Diagram .........................................................4-5
Figure 4-4. Quarter-Bridge Type II Measuring Axial and Bending Strain..............4-7
Figure 4-5. Quarter-Bridge II Circuit Diagram........................................................4-7
Figure 4-6. Half-Bridge Type I Measuring Axial and Bending Strain ....................4-9
Figure 4-7. Half-Bridge Type I Circuit Diagram .....................................................4-9
Figure 4-8. Half-Bridge Type II Rejecting Axial and
Measuring Bending Strain.....................................................................4-11
Figure 4-9. Half-Bridge Type II Circuit Diagram....................................................4-11
Figure 4-10. Full-Bridge Type I Rejecting Axial and Measuring Bending Strain..... 4-13
Figure 4-11. Full-Bridge Type I Circuit Diagram......................................................4-13
Figure 4-12. Full-Bridge Type II Rejecting Axial and Measuring Bending Strain ...4-15
Figure 4-13. Full-Bridge Type II Circuit Diagram ....................................................4-15
Figure 4-14. Full-Bridge Type III Measuring Axial and
Rejecting Bending Strain.......................................................................4-17
Figure 4-15. Full-Bridge Type III Circuit Diagram ...................................................4-17
Figure 4-16. Block Diagram of SCXI-1314/SCXI-1520 Combination .....................4-19
Figure 4-17. Signal During Simultaneous Sample-and-Hold Sampling ....................4-29
Contents
Figure 5-1. Typical Program Flowchart...................................................................5-3
Figure 5-2. LabVIEW Channel Property Node with Filtering Enabled
at 10 kHz and SS/H Disabled................................................................5-12
Figure 5-3. Typical SCXI-1520 Program Flow with
Traditional NI-DAQ (Legacy)...............................................................5-21
© National Instruments Corporation ix SCXI-1520 User Manual
Contents
Tables
Figure 5-4. Using the AI Parameter VI to Set Up the SCXI-1520 .......................... 5-24
Figure 5-5. Offset Null and Shunt Calibration Flowchart ....................................... 5-30
Figure C-1. Removing the SCXI-1520..................................................................... C-2
Table 1-1. Accessories Available for the SCXI-1520............................................ 1-2
Table 2-1. Front Signal Pin Assignments ..............................................................2-11
Table 2-2. Rear Signal Pin Assignments................................................................ 2-13
Table 2-3. SCXI-1520 Communication Signals..................................................... 2-14
Table 3-1. Excitation Voltage for Configuration and Gauge Resistances ............. 3-2
Table 4-1. Strain-Gauge Configurations ................................................................4-2
Table 4-2. Control Codes for Coarse and Fine Offset Null Potentiometers........... 4-26
Table 4-3. NI-DAQmx Values Used to Determine Maximum Sample Rate
in Multiplexed Mode............................................................................. 4-31
Table 4-4. NI-DAQmx Values Used to Determine Maximum Sample Rate
in Parallel Mode.................................................................................... 4-32
Table 4-5. Traditional NI-DAQ (Legacy) Values Used to Determine
Maximum Sample Rate in Multiplexed Mode...................................... 4-33
Table 5-1. NI-DAQmx Properties .......................................................................... 5-5
Table 5-2. Programming a Task in LabVIEW ....................................................... 5-9
Table 5-3. NI-DAQmx Properties .......................................................................... 5-16
Table 5-4. Settings for Configuring the SCXI-1520 Through the AI Parameter ...5-22
Table 5-5. Configuration Functions ....................................................................... 5-31
Table 5-6. NI-DAQ Functions Used to Configure SCXI-1520.............................. 5-33
Table D-1. Digital Signals on the SCXI-1520 ....................................................... D-2
SCXI-1520 User Manual x ni.com
About the SCXI-1520
The SCXI-1520 module is an eight-channel module for interfacing to
strain-gauge bridges and other Wheatstone-bridge based sensors.
Note Descriptions in this chapter explicitly refer to the first channel (channel 0); however,
the same descriptions are applicable to channels <1..7>.
You can configure all settings on a per channel basis in software.
The SCXI-1520 is configured using Measurement & Automation Explorer
(MAX) or through NI-DAQmx property nodes.
With the SCXI-1520 and the accessory SCXI-1314 terminal block, you can
do the following:
• Connect sensors of all bridge configurations, including quarter-, half-,
and full-bridge
• Set the DC voltage excitation between 0 and 10 V (increments
dependent upon the driver software)
• Programmatically offset null bridge circuits connected to the
SCXI-1520
• Set the analog input lowpass filter cut-off frequency to 10 Hz, 100 Hz,
1 kHz, 10 kHz, or bypass
• Set the analog input gain between 1 and 1000 at any one of 49 settings
• Implement shunt calibration using two independent circuits
• Connect the bridge for remote-sense voltage excitation
1
What You Need to Get Started
To set up and use the SCXI-1520, you need the following:
❑ Hardware
– SCXI-1520 module
– One of the following terminal blocks:
• SCXI-1314 terminal block
• SCXI-1314T terminal block
© National Instruments Corporation 1-1 SCXI-1520 User Manual
Chapter 1 About the SCXI-1520
– SCXI or PXI/SCXI combo chassis
– E/M Series DAQ device
– Computer, if using an SCXI chassis
– Cabling, cable adapter, and sensors as required for your
application
❑ Software
– NI-DAQ 7.0 or later
– Application software, such as LabVIEW, LabWindows
Measurement Studio, or other programming environments
❑ Documentation
– Read Me First: Safety and Radio-Frequency Interference
– DAQ Getting Started Guide
– SCXI Quick Start Guide
– SCXI-1520 User Manual
– Documentation for your hardware
– Documentation for your software
™
/CVI™,
The optional accessories listed in Table 1-1 are available for the
SCXI-1520.
Table 1-1. Accessories Available for the SCXI-1520
Accessory Description
SCXI-1314
†
Screw terminal block—Mounts on the front of the SCXI-1520 module.
It includes connections and sockets for two shunt calibration resistors and
a quarter-bridge completion resistor per channel.
SCXI-1314T
††
RJ-50 terminal block—Mounts on the front of the SCXI-1520 module.
It features eight RJ-50 10-position/10-conductor (10p10c) modular plugs
for connection to hardware TEDS smart sensors.
SCXI-1520 User Manual 1-2 ni.com
Chapter 1 About the SCXI-1520
Table 1-1. Accessories Available for the SCXI-1520 (Continued)
Accessory Description
SCXI-1310
‡
Connector and shell assembly—The SCXI-1310 provides 96 eyelet-type
terminals for easy hook-and-solder signal connection and custom
mass termination connectivity.
TBX-96
‡
DIN-rail mounted terminal block with 96 generic screw terminals.
One of the following cables is required to connect the TBX-96 to an
SCXI module:
• SH96-96 shielded cable, 1 m
• R96-96 unshielded ribbon cable, 1 m
†
You must wire a shunt resistor between the pins that correspond to the SCA on the SCXI-1314 and the appropriate legs of
the bridge sensor. Refer to Chapter 4, Theory of Operation, for more information.
††
The SCXI-1314T only supports SCA. It does not support SCB. There are no quarter-bridge completion resistors in the
SCXI-1314T. If you are connecting a quarter-bridge sensor to an SCXI-1520 using an SCXI-1314T, you must place an
external resistor between the pins that correspond to PX– and SX+ on the terminals. Refer to Chapter 2, Connecting Signals,
for more information.
‡
There are no quarter-bridge completion resistors in the SCXI-1310 or TBX-96. If you are connecting a quarter-bridge
sensor to an SCXI-1520 using an SCXI-1310 or TBX-96, you must place an external resistor between the pins that
correspond to PX– and SX+ on the terminals. Refer to Chapter 2, Connecting Signals, for more information.
National Instruments Documentation
The SCXI-1520 User Manual is one piece of the documentation set for data
acquisition (DAQ) systems. You could have any of several types of
manuals depending on the hardware and software in the system. Use the
manuals you have as follows:
• Getting Started with SCXI—This is the first manual you should read.
It gives an overview of the SCXI system and contains the most
commonly needed information for the modules, chassis, and software.
• SCXI or PXI/SCXI chassis manual—Read this manual for
maintenance information on the chassis and for installation
instructions.
• The DAQ Getting Started Guide—This document has information on
installing NI-DAQ and the E/M Series DAQ device. Install these
before you install the SCXI module.
• The SCXI Quick Start Guide—This document contains a quick
overview for setting up an SCXI chassis, installing SCXI modules and
terminal blocks, and attaching sensors. It also describes setting up the
SCXI system in MAX.
© National Instruments Corporation 1-3 SCXI-1520 User Manual
Chapter 1 About the SCXI-1520
• The SCXI hardware user manuals—Read these manuals for detailed
information about signal connections and module configuration. They
also explain, in greater detail, how the module works and contain
application hints.
• Accessory installation guides or manuals—Read the terminal block
and cable assembly installation guides. They explain how to physically
connect the relevant pieces of the system. Consult these guides when
you are making the connections.
• The E/M Series DAQ device documentation—This documentation has
detailed information about the DAQ device that plugs into or is
connected to the computer. Use this documentation for hardware
installation and configuration instructions, specification information
about the DAQ device, and application hints.
• Software documentation—You may have both application software
and NI-DAQ software documentation. National Instruments (NI)
application software includes LabVIEW, LabWindows/CVI, and
Measurement Studio. After you set up the hardware system, use either
your application software documentation or the NI-DAQ
documentation to help you write your application. If you have a large,
complex system, it is worthwhile to look through the software
documentation before you configure the hardware.
• One or more of the following help files for software information:
– Start»Programs»National Instruments»NI-DAQ»
NI-DAQmx Help
– Start»Programs»National Instruments»NI-DAQ»
Traditional NI-DAQ User Manual
– Start»Programs»National Instruments»NI-DAQ»
Traditional NI-DAQ Function Reference Help
• NI strain-gauge application notes or tutorials—NI has additional
material about strain gauges and strain measurements available at
ni.com/support.
You can download NI documents from
the latest version of NI-DAQ, click Download Software at
SCXI-1520 User Manual 1-4 ni.com
ni.com/manuals. To download
ni.com.
Chapter 1 About the SCXI-1520
Installing Application Software, NI-DAQ, and the E/M Series DAQ Device
Refer to the DAQ Getting Started Guide packaged with the NI-DAQ
software to install your application software, NI-DAQ driver software, and
the DAQ device to which you will connect the SCXI-1520. NI-DAQ 7.0 or
later is required to configure and program the SCXI-1520 module. If you
do not have NI-DAQ 7.0 or later, you can either contact a NI sales
representative to request it on a CD or download the latest NI-DAQ version
ni.com.
from
Note Refer to the Read Me First: Radio-Frequency Interference document before
removing equipment covers or connecting or disconnecting any signal wires.
Installing the SCXI-1520 Module into the SCXI Chassis
Refer to the SCXI Quick Start Guide to install your SCXI-1520 module.
Connecting the SCXI-1520 in an SCXI Chassis to an E/M Series DAQ Device for Multiplexed Scanning
Refer to the SCXI Quick Start Guide to install the cable adapter and connect
the SCXI modules to the DAQ device.
If you have already installed the appropriate software, refer to Chapter 3,
Configuring and Testing, to configure the SCXI-1520 module(s).
Connecting the SCXI-1520 in a PXI/SCXI Combination Chassis to an E/M Series DAQ Device for Multiplexed Scanning
Refer to the SCXI Quick Start Guide to connect the SCXI modules to the
DAQ device.
If you have already installed the appropriate software, refer to Chapter 3,
Configuring and Testing, to configure the SCXI-1520 module(s).
© National Instruments Corporation 1-5 SCXI-1520 User Manual
Chapter 1 About the SCXI-1520
Verifying the SCXI-1520 Installation in Software
Refer to the SCXI Quick Start Guide for information on verifying the SCXI
installation.
Installing SCXI Using NI-DAQmx in Software
Refer to the SCXI Quick Start Guide for information on installing modules
using NI-DAQmx in software.
Manually Adding Modules in NI-DAQmx
If you did not auto-detect the SCXI modules, you must manually add each
of the modules. Refer to the SCXI Quick Start Guide to manually add
modules.
Note NI recommends auto-detecting modules for the first time configuration of the
chassis.
Installing SCXI Using Traditional NI-DAQ (Legacy) in Software
Refer to the SCXI Quick Start Guide for information on installing modules
using Traditional NI-DAQ (Legacy) in software.
Manually Adding Modules in Traditional NI-DAQ (Legacy)
If you did not auto-detect the SCXI modules, you must manually add each
of the modules. Refer to the SCXI Quick Start Guide to manually add
modules.
Note NI recommends auto-detecting modules for the first time configuration of the
chassis.
Verifying and Self-Testing the Installation
The verification procedure for the SCXI chassis is the same for both
NI-DAQmx and Traditional NI-DAQ (Legacy). To test the successful
installation for the SCXI chassis, refer to the SCXI Quick Start Guide.
Verify that the chassis is powered on and correctly connected to an
E/M Series DAQ device.
SCXI-1520 User Manual 1-6 ni.com
Chapter 1 About the SCXI-1520
After verifying and self-testing the installation, the SCXI system should
operate properly with your ADE software. If the test did not complete
successfully, refer to Chapter 3, Configuring and Testing, for
troubleshooting steps.
Troubleshooting the Self-Test Verification
If the Self-Test Verification did not verify the chassis configuration,
complete the steps in this section to troubleshoot the SCXI configuration.
Troubleshooting in NI-DAQmx
• If you get a Verify SCXI Chassis message box showing the SCXI
chassis model number, Chassis ID: x, and one or more messages
stating Slot Number: x Configuration has module: SCXI-XXXX
or 1520, hardware in chassis is: Empty, take the following
troubleshooting actions:
– Make sure the SCXI chassis is powered on.
– Make sure all SCXI modules are properly installed in the chassis.
Refer to the SCXI Quick Start Guide for proper installation
instructions.
– Make sure the cable between the SCXI chassis and E/M Series
DAQ device is properly connected.
– Inspect the cable connectors for bent pins.
– Make sure you are using the correct NI cable assembly.
– Test the DAQ device to verify it is working properly. Refer to the
DAQ device help file for more information.
• If you get a Verify SCXI Chassis message box showing the SCXI
chassis model number,
Number:
hardware in chassis is: SCXI-
complete the following troubleshooting steps to correct the error.
1. Expand the list of NI-DAQmx devices by clicking the + next to
2. Right-click the SCXI chassis and click Properties to load the
3. Under the Modules tab, ensure that the cabled module is listed in
x
Configuration has module: SCXI-
NI-DAQmx Devices.
chassis configurator.
the correct slot.
Chassis ID:
x
, and the message Slot
YYYY
XXXX
or 1520,
, 1520, or Empty,
© National Instruments Corporation 1-7 SCXI-1520 User Manual
Chapter 1 About the SCXI-1520
4. If the cabled module is not listed in the correct slot, complete the
following troubleshooting steps:
a. If the cabled module is not listed in the correct slot and the
slot is empty, click the drop-down listbox next to the correct
slot and select the cabled module. Configure the cabled
module following the steps listed in the SCXI Quick Start
Guide. Click OK.
b. If another module appears where the cabled module should
be, click the drop-down listbox next to the correct slot and
select the cabled module. A message box appears asking you
to confirm the module replacement. Click OK. Configure the
cabled module following the steps listed in the SCXI Quick
Start Guide. Click OK.
• Ensure that you have the highest priority SCXI module cabled to the
E/M Series DAQ device. Refer to the SCXI Quick Start Guide to find
out which SCXI module in the chassis should be cabled to the DAQ
device.
• After checking the preceding items, return to the Troubleshooting the
Self-Test Verification section and retest the SCXI chassis.
If these measures do not successfully configure the SCXI system, contact
NI. Refer to the Technical Support Information document for contact
information.
Troubleshooting in Traditional NI-DAQ (Legacy)
• If you get the message Unable to test chassis at this time,
you have not designated at least one module as connected to a E Series
DAQ device. Refer to the Traditional NI-DAQ (Legacy) section of
Chapter 3, Configuring and Testing,
the cabled module in the system from Connected to: None to
Connected to: Device x.
• If you get the message
codes and the message
Failed to find followed by the module
Unable to communicate with chassis,
take the following troubleshooting actions:
– Make sure the SCXI chassis is powered on.
– Make sure the cable between the SCXI chassis and E Series DAQ
device is properly connected.
– Inspect the cable connectors for bent pins.
– Make sure you are using the correct NI cable assembly.
– Test the DAQ device to verify it is working properly. Refer to the
DAQ device help file for more information.
SCXI-1520 User Manual 1-8 ni.com
and change the configuration of
Chapter 1 About the SCXI-1520
• If you get the message Failed to find, followed by module codes
and the message
Instead found: module with ID 0Xxx, refer
to the Traditional NI-DAQ (Legacy) section of Chapter 3, Configuring
and Testing, and make sure the correct module is in the specified slot.
Delete the incorrect module as described in Appendix C, Removing the
SCXI-1520, and add the correct module as described in the Traditional
NI-DAQ (Legacy) section of Chapter 3, Configuring and Testing.
• If you get the message
and the message
Failed to find, followed by a module code
Slot x is empty, make sure the configured module
is installed in the specified slot. If not, install the module by following
the instructions in the Installing the SCXI-1520 Module into the SCXI
Chassis section. If the module is installed in the correct slot, power off
the chassis, remove the module as specified in Appendix C, Removing
the SCXI-1520, and verify that no connector pins are bent on the rear
signal connector. Reinstall the module as described in the Installing the
SCXI-1520 Module into the SCXI Chassis section, ensuring
the module is fully inserted and properly aligned in the slot.
• After checking the preceding items, return to the Troubleshooting the
Self-Test Verification section and retest the SCXI chassis.
If these measures do not successfully configure the SCXI system, contact
NI. Refer to the Technical Support Information document for contact
information.
© National Instruments Corporation 1-9 SCXI-1520 User Manual
Connecting Signals
This chapter describes how to connect Wheatstone bridge sensors to the
SCXI-1520 in quarter-, half-, and full-bridge configurations and for remote
sensing. It also provides the front and rear signal pin assignments of the
module.
Connecting Bridge Sensor Signals
This section discusses how to connect the signals of supported strain-gauge
configuration types as well as full-bridge sensors such as load, force,
torque, and pressure sensors. It also discusses connecting leads for remote
sensing and shunt calibration. Refer to Chapter 4, Theory of Operation, for
a discussion of strain-gauge concepts. Refer to the SCXI-1314 Installation
Guide for more signal connection information.
Notes The circuits in this section illustrate circuits using the SCXI-1314 terminal block.
If you are using the SCXI-1314T terminal block, refer to the SCXI-1314T TEDS Bridge
Sensor Terminal Block Installation Guide for the permitted circuit configuration diagrams.
2
Refer to Figure 2-5 and use its wiring diagram for full-bridge sensors such as load, force,
torque, and pressure sensors.
Quarter-Bridge Type I
This section provides information for connecting the quarter-bridge
strain-gauge configuration type I. Figure 2-1 shows the quarter-bridge
type I circuit wiring diagram.
Note S– is left unwired.
© National Instruments Corporation 2-1 SCXI-1520 User Manual
Chapter 2 Connecting Signals
SCXI-1520 Set Bridge
Configuration to
Quarter Bridge
+
–
+
–
V
CH
S+
P+
R
L
R
L
R
L
QTR
SCA
SCA
Shunt
Cal A
P
SCXI-1314
R
1
R
2
R
S
R
3
R
4
(gauge)
V
EX
+
You must connect
the shunt calibration
wires externally using
the terminal block
screw connections.
Transducer
Figure 2-1. Quarter-Bridge I Circuit Diagram
Quarter-Bridge Type II
SCXI-1520 User Manual 2-2 ni.com
The following symbols apply to the circuit diagram and equations:
•R
and R2 are half-bridge completion resistors.
1
•R
is the quarter-bridge completion resistor.
3
•R
is the active element measuring tensile strain (+ε).
4
• V
• R
• V
Note The value of the quarter-bridge completion resistor, R
resistance of the strain gauge. NI recommends using a 0.1% precision resistor.
This section provides information for connecting the quarter-bridge
strain-gauge configuration type II. Figure 2-2 shows the quarter-bridge
type II circuit wiring diagram.
is the excitation voltage.
EX
is the lead resistance.
L
is the measured voltage.
CH
, must equal the nominal
3
Chapter 2 Connecting Signals
+
–
+
–
S+
P+
P
R
L
R
L
R
L
SCA
SCA
Shunt
Cal A
SCXI-1314Transducer
V
CH
R
1
R
2
R
S
R
4
(gauge)
V
EX
R
3
(dummy)
R
L
R
L
SCXI-1520 Set Bridge
Configuration to Quarter Bridge
Note The quarter-bridge type II configuration is often confused with the more commonly
used half-bridge type I configuration. In the half-bridge type I configuration, the R
3
element is active and bonded to the strain specimen to measure Poisson's ratio, while in the
quarter-bridge type II configuration, the R
element does not actively measure strain, but
3
is in close thermal contact with the strain specimen. In quarter-bridge type II configuration,
element is not bonded to the specimen. Typically it is either physically close to the
the R
3
specimen or mounted on the same type material at the same temperature, but is not under
strain.
Figure 2-2. Quarter-Bridge II Circuit Diagram
The following symbols apply to the circuit diagram and equations:
© National Instruments Corporation 2-3 SCXI-1520 User Manual
Note S– and QTR are left unwired.
•R
and R2 are half-bridge completion resistors.
1
•R
is the quarter-bridge temperature-sensing element (dummy gauge).
3
•R
is the active element measuring tensile strain (+ε).
4
• V
• R
• V
is the excitation voltage.
EX
is the lead resistance.
L
is the measured voltage.
CH
Chapter 2 Connecting Signals
+
–
+
–
S+
P+
P
R
L
R
L
R
L
SCA
SCA
Shunt
Cal A
+
v
SCXI-1520 Set Bridge
Configuration to Half Bridge
SCXI-1314
Transducer
V
CH
R
1
R
2
R
S
R
4
(gauge)
V
EX
R
3
(gauge)
R
L
R
L
Half-Bridge Type I
Note S– is left unwired.
This section provides information for connecting the half-bridge
strain-gauge configuration type I. Figure 2-3 shows the half-bridge type I
circuit wiring diagram.
Figure 2-3. Half-Bridge Type I Circuit Diagram
The following symbols apply to the circuit diagram and equations:
•R
and R2 are half-bridge completion resistors.
1
•R
is the active element measuring compression from Poisson
3
effect (–νε).
Note As shown in Figure 2-4, for greatest calibration accuracy, use separate wires
•R
• V
• R
• V
between the bridge and the SCA terminals. Do not directly connect S+ or P– to the
SCXI-1520 User Manual 2-4 ni.com
SCA terminals inside the SCXI-1314 terminal block unless the strain-gauge cable
length is very short.
is the active element measuring tensile strain (+ε).
4
is the excitation voltage.
EX
is the lead resistance.
L
is the measured voltage.
CH
Half-Bridge Type II
+
–
+
–
S+
P+
P
R
L
R
L
R
L
SCA
SCA
Shunt
Cal A
+
–
SCXI-1314Transducer
V
CH
R
1
R
2
R
S
R
4
(gauge)
V
EX
R
3
(gauge)
R
L
R
L
V
out
+
V
out
SCXI-1520 Set Bridge
Configuration to Half Bridge
Note S– is left unwired.
Chapter 2 Connecting Signals
This section provides information for connecting the half-bridge
strain-gauge configuration type II. Figure 2-4 shows the half-bridge type II
circuit wiring diagram.
Figure 2-4. Half-Bridge Type II Circuit Diagram
The following symbols apply to the circuit diagram and equations:
•R
and R2 are half-bridge completion resistors.
1
•R
is the active element measuring compressive strain (–ε).
3
•R
© National Instruments Corporation 2-5 SCXI-1520 User Manual
Note As shown in Figure 2-3, for greatest calibration accuracy, use separate wires
between the bridge and the SCA terminals. Do not directly connect S+ or P– to the
SCA terminals inside the SCXI-1314 terminal block unless the strain-gauge cable
length is very short.
is the active element measuring tensile strain (+ε).
4
• V
• R
• V
is the excitation voltage.
EX
is the lead resistance.
L
is the measured voltage.
CH
Chapter 2 Connecting Signals
+
–
V
EX
+
V
EX
+
–
S+
S
P+
P
R
1
R
2
R
4
R
3
SCA
SCA
Shunt
Cal A
+
–
+
–
R
L
R
L
SCXI-1520 Set Bridge
Configuration to Full BridgeSCXI-1314
Transducer
V
CH
R
S
CH+
CH
R
L
R
L
Full-Bridge Type I
This section provides information for connecting the full-bridge
strain-gauge configuration type I. Figure 2-5 shows the full-bridge type I
circuit wiring diagram.
Figure 2-5. Full-Bridge Type I Circuit Diagram
The following symbols apply to the circuit diagram and equations:
•R
is an active element measuring compressive strain (–ε).
1
•R
is an active element measuring tensile strain (+ε).
2
•R
is an active element measuring compressive strain (–ε).
3
•R
is an active element measuring tensile strain (+ε).
4
SCXI-1520 User Manual 2-6 ni.com
Note As shown in Figure 2-5, for greatest calibration accuracy, use separate wires
between the bridge and the SCA terminals. Do not directly connect S+ or P– to the
SCA terminals inside the SCXI-1314 terminal block unless the strain-gauge cable
length is very short.
• V
• R
• V
is the excitation voltage.
EX
is the lead resistance.
L
is the measured voltage.
CH
Full-Bridge Type II
+
–
+
–
S+
S
P+
P
SCA
SCA
Shunt
Cal A
+
–
–v
+v
R
L
R
L
SCXI-1520 Set Bridge
Configuration to Full BridgeSCXI-1314
Transducer
R
1
R
2
R
4
R
3
V
CH
R
S
V
EX
+
V
EX–
R
L
R
L
Chapter 2 Connecting Signals
This section provides information for connecting the full-bridge
strain-gauge configuration type II. Figure 2-6 shows the full-bridge type II
circuit wiring diagram.
Figure 2-6. Full-Bridge Type II Circuit Diagram
The following symbols apply to the circuit diagram and equations:
•R
is an active element measuring compressive Poisson effect (–νε).
1
•R
is an active element measuring tensile Poisson effect (+νε).
2
•R
is an active element measuring compressive strain (–ε).
3
© National Instruments Corporation 2-7 SCXI-1520 User Manual
Note As shown in Figure 2-6, for greatest calibration accuracy, use separate wires
between the bridge and the SCA terminals. Do not directly connect S+ or P– to the
SCA terminals inside the SCXI-1314 terminal block unless the strain-gauge cable
length is very short.
• V
• R
• V
•R
is an active element measuring tensile strain (+ε).
4
is the excitation voltage.
EX
is the lead resistance.
L
is the measured voltage.
CH
Chapter 2 Connecting Signals
+
–
+
–
S+
S
P+
P
SCA
SCA
Shunt
Cal A
+
–v
–v
+
SCXI-1520 Set Bridge
Configuration to Full BridgeSCXI-1314
Transducer
R
1
R
2
R
4
R
3
V
CH
R
S
V
EX
+
V
EX–
R
L
R
L
Full-Bridge Type III
This section provides information for connecting the full-bridge
strain-gauge configuration type I. The full-bridge type III only measures
axial strain. Figure 2-7 shows the full-bridge type III circuit wiring
diagram.
Figure 2-7. Full-Bridge Type III Circuit Diagram
The following symbols apply to the circuit diagram and equations:
•R
is an active element measuring compressive Poisson effect (–νε).
1
•R
is an active element measuring tensile strain (+ε).
2
•R
is an active element measuring compressive Poisson effect (–νε).
3
•R
is an active element measuring the tensile strain (+ε).
4
is the excitation voltage.
EX
is the lead resistance.
L
is the measured voltage.
CH
Note As shown in Figure 2-7, for greatest calibration accuracy, use separate wires
between the bridge and the SCA terminals. Do not directly connect S+ or P– to the
SCA terminals inside the SCXI-1314 terminal block unless the strain-gauge cable
• V
• R
• V
length is very short.
SCXI-1520 User Manual 2-8 ni.com
Remote Sense
Note NI recommends using remote sense if your application requires the improved
accuracy. Refer to Chapter 4, Theory of Operation, for more information about using
remote sense.
Run Separate Wires
Between Remote-Sense
Terminals and Bridge
R
1
Chapter 2 Connecting Signals
Wire the SCXI-1520 for remote sense as shown in Figure 2-8.
SCXI-1520SCXI-1314Transducer
RS+
V
EX
+
R
4
P+
+
–
Feedback
R
2
V
EX–
R
3
P
RS
Figure 2-8. Remote-Sense Circuit Diagram
Note
If you use remote sense, set RL to zero in the equations for measured strain (ε).
© National Instruments Corporation 2-9 SCXI-1520 User Manual
Chapter 2 Connecting Signals
Pin Assignments
The pin assignments for the SCXI-1520 front signal connector are shown
in Table 2-1. The front signal connector is a special 96-pin DIN C male
connector through which you make all signal connections. The terminal
assignments are as follows:
•SX+ and SX– are for analog input
•RSX+ and RSX– are for remote sense
•PX+ and PX– are for excitation output
•SCAX are for shunt calibration circuit A
•SCBX are for shunt calibration circuit B
where X is the channel number.
The negative terminals are listed in Column B and the positive terminals are
listed in Column C. The pins labeled RSVD are reserved. Do not make any
connections to the RSVD pins.
SCXI-1520 User Manual 2-10 ni.com
Column
A B C
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
© National Instruments Corporation 2-11 SCXI-1520 User Manual
Chapter 2 Connecting Signals
Table 2-1. Front Signal Pin Assignments
Front Connector Diagram Pin Number Column A Column B Column C
32 SCB0 S0– S0+
31 SCB0 RS0– RS0+
30 SCB1 P0– P0+
29 SCB1 SCA0 SCA0
28 RSVD S1– S1+
27 RSVD RS1– RS1+
26 RSVD P1– P1+
25 RSVD SCA1 SCA1
24 SCB2 S2– S2+
23 SCB2 RS2– RS2+
22 SCB3 P2– P2+
21 SCB3 SCA2 SCA2
20 RSVD S3– S3+
19 RSVD RS3– RS3+
18 RSVD P3– P3+
17 RSVD SCA3 SCA3
16 SCB4 S4– S4+
15 SCB4 RS4– RS4+
14 SCB5 P4– P4+
13 SCB5 SCA4 SCA4
12 RSVD S5– S5+
11 RSVD RS5– RS5+
10 RSVD P5– P5+
9 RSVD SCA5 SCA5
8 SCB6 S6– S6+
7 SCB6 RS6– RS6+
6 SCB7 P6– P6+
5 SCB7 SCA6 SCA6
4 RSVD S7– S7+
3 RSVD RS7– RS7+
2 RSVD P7– P7+
1 RSVD SCA7 SCA7
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