National Instruments NI PXI-4224 User manual

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NI PXI-4224 User Manual
NI PXI-4224 User Manual
August 2008
373752G-01
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The NI PXI-4224 is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced
by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective during the
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The media on which you receive National Instruments software are warranted not to fail to execute programming instructions, due to defects in
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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.
This icon denotes a note, which alerts you to important information.
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
the product, refer to the Read Me First: Safety and Radio-Frequency
Interference document, shipped with the product, for precautions to take.
When symbol is marked on a product it denotes a warning advising you to
take precautions to avoid electrical shock.
When symbol is marked on a product it denotes a component that may be
hot. Touching this component may result in bodily injury.
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, hardware labels,
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, and code excerpts.
© National Instruments Corporation v NI PXI-4224 User Manual
Contents
Chapter 1
About the NI PXI-4224
What You Need to Get Started ......................................................................................1-2
National Instruments Documentation ............................................................................1-3
Installing the Application Software, NI-DAQ, and the DAQ Device ...........................1-3
Installing the NI PXI-4224 ............................................................................................1-4
LED Pattern Descriptions ..............................................................................................1-4
Chapter 2
Connecting Signals
Connecting Signals to the NI PXI-4224 ........................................................................2-1
Front Signal Connector....................................................................................2-1
Analog Input Connections...............................................................................2-3
Floating Signal Source Connection...................................................2-11
Ground-Referenced Signal Connection ............................................2-12
Shielded Ground-Referenced Signal Connection
(Recommended) .............................................................................2-12
Chapter 3
Configuring and Testing
Verifying and Self-Testing the Signals Using Test Panels............................................3-1
Configuring the NI PXI-4224 in MAX..........................................................................3-2
Creating a Voltage Task or Global Channel Using NI-DAQmx.....................3-2
Verifying and Self-Testing an NI-DAQmx Task or Global Channel..............3-3
Chapter 4
Theory of Operation
Theory of Operation.......................................................................................................4-1
Signal Conditioning Functional Overview......................................................4-3
Measurement Considerations ..........................................................................4-3
Input Impedance................................................................................4-3
Common-Mode Rejection Ratio .......................................................4-4
Effective CMR ..................................................................................4-5
Timing and Control Functional Overview ......................................................4-5
Programmable Function Inputs .......................................................................4-6
Device and PXI Clocks ...................................................................................4-7
Contents
NI PXI-4224 User Manual vi ni.com
Chapter 5
Using the NI PXI-4224
Developing Your Application ....................................................................................... 5-1
Typical Program Flow Chart........................................................................... 5-1
Overview of Typical Flow Chart .................................................................... 5-3
Creating a Task Using DAQ Assistant or Programmatically ........... 5-3
Adjusting Timing and Triggering..................................................... 5-3
Configuring Channel Properties ....................................................... 5-4
Acquiring, Analyzing, and Presenting.............................................. 5-5
Completing the Application.............................................................. 5-5
Developing an Application Using LabVIEW ................................................. 5-5
Using a DAQmx Channel Property Node in LabVIEW................... 5-7
Synchronization and Triggering...................................................................... 5-8
Synchronizing the NI PXI-4224 ..................................................................... 5-8
Synchronizing the NI PXI-4224 Using LabVIEW........................... 5-10
Other Application Documentation and Material ........................................................... 5-11
Calibrating the NI PXI-4224 ......................................................................................... 5-12
Loading Calibration Constants........................................................................ 5-12
Self-Calibration............................................................................................... 5-12
External Calibration ........................................................................................ 5-13
Appendix A
Specifications
Appendix B
Timing Signal Information
Appendix C
Removing the NI PXI-4224
Appendix D
Common Questions
Glossary
Index
Contents
© National Instruments Corporation vii NI PXI-4224 User Manual
Figures
Figure 2-1. NI PXI-4224 Front Label ......................................................................2-3
Figure 2-2. Unshielded Floating Signal Source Connection
Using a D-SUB Connector ....................................................................2-4
Figure 2-3. Unshielded Grounded Signal Source Connection
Using a D-SUB Connector ....................................................................2-5
Figure 2-4. Shielded Floating Signal Source Connection
Using a D-SUB Connector ....................................................................2-6
Figure 2-5. Shielded Grounded Signal Source Connection
Using a D-SUB Connector ....................................................................2-7
Figure 2-6. Unshielded Floating Signal Source Connection
Using a Terminal Block ........................................................................2-8
Figure 2-7. Unshielded Grounded Signal Source Connection
Using a Terminal Block ........................................................................2-9
Figure 2-8. Shielded Floating Signal Source Connection
Using a Terminal Block ........................................................................2-10
Figure 2-9. Shielded Grounded Signal Source Connection
Using a Terminal Block ........................................................................2-11
Figure 4-1. Block Diagram of NI PXI-4224 ............................................................4-2
Figure 4-2. Effect of Input Impedance on Signal Measurements ............................4-4
Figure 4-3. AI CONV CLK Signal Routing ............................................................4-6
Figure 4-4. NI PXI-4224 PXI Trigger Bus Signal Connection................................4-8
Figure 5-1. Typical Program Flowchart...................................................................5-2
Figure 5-2. General Synchronizing Flowchart.........................................................5-9
Figure A-1. PXI-4224 Dimensions ...........................................................................A-4
Figure B-1. Typical Posttriggered Sequence ............................................................B-2
Figure B-2. Typical Pretriggered Sequence..............................................................B-2
Figure B-3. AI START TRIG Input Signal Timing .................................................B-3
Figure B-4. AI START TRIG Output Signal Timing...............................................B-3
Figure B-5. AI REF TRIG Input Signal Timing.......................................................B-4
Figure B-6. AI REF TRIG Output Signal Timing....................................................B-5
Figure B-7. AI SAMP CLK Input Signal Timing ....................................................B-6
Figure B-8. AI SAMP CLK Output Signal Timing..................................................B-6
Figure B-9. AI CONV CLK Input Signal Timing ....................................................B-7
Figure B-10. AI CONV CLK Output Signal Timing .................................................B-8
Figure B-11. AI SAMPLE CLK TIMEBASE Signal Timing ....................................B-9
Figure B-12. AI HOLD COMPLETE Signal Timing.................................................B-10
Figure C-1. Injector/Ejector Handle Position Before Device Removal....................C-2
Contents
NI PXI-4224 User Manual viii ni.com
Tables
Table 2-1. NI PXI-4224 25-Pin D-SUB Terminal Pin Assignments ..................... 2-2
Table 4-1. Signal Conditioning Functional Blocks ................................................ 4-3
Table 4-2. PXI Trigger Bus Timing Signals .......................................................... 4-9
Table 5-1. NI-DAQmx Properties .......................................................................... 5-4
Table 5-2. Programming a Task in LabVIEW ....................................................... 5-6
Table 5-3. Synchronizing the NI PXI-4224 Using LabVIEW ............................... 5-10
Table A-1. Maximum Sampling Rates.................................................................... A-1
© National Instruments Corporation 1-1 NI PXI-4224 User Manual
1
About the NI PXI-4224
This chapter provides an introduction to the NI PXI-4224 device and its
installation.
The NI PXI-4224 is part of the NI PXI-4200 series of data acquisition
(DAQ) devices with integrated signal conditioning. The PXI-4200 series
reduces measurement setup and configuration complexity by integrating
signal conditioning and DAQ on the same product.
The NI PXI-4224 is an 8-channel isolated analog input device with a ±10 V
input range. It allows isolated analog measurements directly on the PXI
platform.
The NI PXI-4224 has the following characteristics:
Each channel has a gain of either 1 or 10.
An isolation rating of 42.4 V
peak
or 60 VDC, Category I.
The front connector is a 25-pin D-SUB connector, with 16 pins for
analog input.
Signal connections are made through a TB-2725 terminal block that
provides connections for all eight analog input channels. You can
optionally connect a standard 25-pin D-SUB cable to the device and cable
it as needed for your application.
Note Go to ni.com/products to determine if newly developed terminal blocks are
available.
You can configure most settings on a per-channel basis through software.
The NI PXI-4224 is configured using Measurement & Automation
Explorer (MAX) or through function calls to NI-DAQmx.
Note The NI PXI-4224 is supported in NI-DAQmx only.
Chapter 1 About the NI PXI-4224
NI PXI-4224 User Manual 1-2 ni.com
What You Need to Get Started
To set up and use the NI PXI-4224, you need the following:
Hardware
–NIPXI-4224
One of the following:
TB-2725 terminal block
25-pin D-SUB female connector
PXI or PXI/SCXI combination chassis
Software
NI-DAQ 7.3.1 or later
One of the following:
•LabVIEW
Measurement Studio
LabWindows
/CVI
Documentation
NI PXI-4224 User Manual
Read Me First: Safety and Radio-Frequency Interference
DAQ Getting Started Guide
PXI or PXI/SCXI combination chassis user manual
Documentation for your software
Tools
1/8 in. flathead screwdriver
You can download NI documents from
ni.com/manuals.
Chapter 1 About the NI PXI-4224
© National Instruments Corporation 1-3 NI PXI-4224 User Manual
National Instruments Documentation
The NI PXI-4224 User Manual is one piece of the documentation set for
your DAQ system. You could have any of several types of manuals
depending on the hardware and software in your system. Use the manuals
you have as follows:
DAQ Getting Started Guide—This document describes how to install
NI-DAQ devices and NI-DAQ. Install NI-DAQmx before you install
the SCXI module.
SCXI Quick Start Guide—This document describes how to set up an
SCXI chassis, install SCXI modules and terminal blocks, and
configure the SCXI system in MAX.
PXI or PXI/SCXI combination chassis manual—Read this manual for
maintenance information about the chassis and for installation
instructions.
Accessory installation guides or manuals—If you are using accessory
products, read the terminal block installation guides. They explain how
to physically connect the relevant pieces of the system.
Software documentation—You may have both application software
and NI-DAQmx software documentation. NI application software
includes LabVIEW, Measurement Studio, and LabWindows/CVI.
After you set up the hardware system, use either your application
software documentation or the NI-DAQmx documentation to help you
write your application. If you have a large, complicated system, it is
worthwhile to look through the software documentation before you
configure the hardware.
Installing the Application Software, NI-DAQ,
and the DAQ Device
Refer to the DAQ Getting Started Guide, packaged with the NI-DAQ
software, for instructions for installing your application software, NI-DAQ
driver software, and the DAQ device to which you will connect the
NI PXI-4224.
NI-DAQ 7.3.1 or later is required to configure and program the
NI PXI-4224 device. If you do not have NI-DAQ 7.3.1 or later, you can
either contact an NI sales representative to request it on a CD or download
it from
ni.com.
Chapter 1 About the NI PXI-4224
NI PXI-4224 User Manual 1-4 ni.com
Installing the NI PXI-4224
Note Refer to the Read Me First: Radio-Frequency Interference document before
removing equipment covers or connecting or disconnecting any signal wires.
Refer to the DAQ Getting Started Guide to unpack, install, and configure
the NI PXI-4224 in a PXI chassis, and then to the SCXI Quick Start Guide
if you are using a PXI/SCXI combination chassis.
LED Pattern Descriptions
The following LEDs on the NI PXI-4224 front panel confirm the system is
functioning properly:
The ACCESS LED is normally green and blinks yellow for a minimum
of 100 ms during the NI PXI-4224 configuration.
The ACTIVE LED is normally green and blinks yellow for a minimum
of 100 ms during data acquisition.
© National Instruments Corporation 2-1 NI PXI-4224 User Manual
2
Connecting Signals
This chapter provides details about the front signal connector of the
NI PXI-4224 and how to connect signals to the NI PXI-4224.
Connecting Signals to the NI PXI-4224
After you have verified that the NI PXI-4224 is installed correctly and
self-tested the device, refer to the following sections to connect signals to
the device.
Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document
before removing equipment covers, or connecting or disconnecting any signal wires.
Front Signal Connector
The NI PXI-4224 connection interface consists of a 25-pin D-SUB
connector and one SMB connector. You can program SMB connector
as a PFI 0 line or for external calibration. Table 2-1 shows the signal
assignments of the D-SUB connector for the NI PXI-4224. Figure 2-1
shows the front label, with each set of screw terminals labeled according
to the corresponding differential input signal for the NI PXI-4224.
To connect a signal to the NI PXI-4224, use a TB-2725 terminal block
designed specifically for the NI-PXI-4224, or use a 25-pin D-SUB to build
a connector to suit your application. Refer to the TB-2725 Terminal Block
Installation Guide if you are using the TB-2725 terminal block. Use
Table 2-1 to make the signal connections if you are constructing a
connector using a 25-pin D-SUB connector.
Connect a timing or triggering signal to the PFI 0/CAL SMB connector
using a cable with an SMB signal connector.
Chapter 2 Connecting Signals
NI PXI-4224 User Manual 2-2 ni.com
Caution The PFI 0/CAL SMB connector is for low-voltage timing and calibration signals
only. Voltages greater than ±15 V can damage the device.
If you are building a 25-pin D-SUB connector for your application, make sure you use a
connector and wires that are safety rated for the voltage and category of the signals in your
application.
Table 2-1. NI PXI-4224 25-Pin D-SUB Terminal Pin Assignments
Front Connector
Diagram
Pin Number Signal Names Pin Number Signal Names
*
NC—No Connection
14 AI 0 – 1 AI 0 +
15 AI 1 – 2 AI 1 +
16 AI 2 – 3 AI 2 +
17 AI 3 – 4 AI 3 +
18 AI 4 – 5 AI 4 +
19 AI 5 – 6 AI 5 +
20 AI 6 – 7 AI 6 +
21 AI 7 – 8 AI 7 +
22 No Pin 9 No Pin
23 NC
*
10 D GND
24 SPI CLK 11 MISO
25 SELECT 12 MOSI
N/A N/A 13 +5 V
14 15 16 17 18 19 20 21 22 23 24 25
12345678910111213
Chapter 2 Connecting Signals
© National Instruments Corporation 2-3 NI PXI-4224 User Manual
Figure 2-1. NI PXI-4224 Front Label
Analog Input Connections
The following sections provide a definition of the signal source
characteristics, descriptions of various ways to connect signals to the
NI PXI-4224, and electrical diagrams showing the signal source and
connections. Whenever possible, use shielded twisted-pair field wiring
and grounding to reduce the effects of unwanted noise sources.
1 ACCESS and ACTIVE LEDs
2 SMB PFI 0/CAL Connector
3 25-Pin D-SUB or TB-2725 Terminal
Block Connector
NI PXI-4224
8 Chan Isolation Amp
ACCESS ACTIVE
PFI 0/
CAL
14 15 16 17 18 19 20 21 22 23 24 25
12345678910111213
1
2
3
Chapter 2 Connecting Signals
NI PXI-4224 User Manual 2-4 ni.com
In the electrical diagrams, two different ground symbols are used. These
symbols indicate that you cannot assume that the indicated grounds are at
the same potential. Refer to Appendix A, Specifications, for maximum
working voltage specifications.
You can make signal connections to the NI PXI-4224 through either an
NI terminal block, such as the TB-2725, or you can build a connector using
a 25-pin D-SUB.
Caution If you are building a 25-pin D-SUB connector for your application, make sure
you use a connector and signal wires that are safety rated for the voltage and category of
the signals in your application.
Figures 2-2 through 2-5 illustrate connecting signals using a D-SUB
connector.
Figure 2-2. Unshielded Floating Signal Source Connection Using a D-SUB Connector
+
Tw i sted-Pair
Wiring
AI 0 +
AI 0 –
CH 0
V
SIG
Signal Source
AI 7 +
AI 7 –
CH 7
Chapter 2 Connecting Signals
© National Instruments Corporation 2-5 NI PXI-4224 User Manual
Figure 2-3. Unshielded Grounded Signal Source Connection Using a D-SUB Connector
CH 0
CH 7
+
Tw i sted-Pair
Wiring
V
SIG
V
SIG
Ground
Reference
Signal Source
AI 0 +
AI 0 –
AI 7 +
AI 7 –
Chapter 2 Connecting Signals
NI PXI-4224 User Manual 2-6 ni.com
Figure 2-4. Shielded Floating Signal Source Connection Using a D-SUB Connector
+
AI 0 +
AI 0 –
CH 0
V
SIG
Signal Source
AI 7 +
AI 7 –
CH 7
Shielding
Tw i sted-Pair
Wiring
Chapter 2 Connecting Signals
© National Instruments Corporation 2-7 NI PXI-4224 User Manual
Figure 2-5. Shielded Grounded Signal Source Connection Using a D-SUB Connector
CH 0
CH 7
Shielding
+
Tw i sted-Pair
Wiring
V
SIG
V
SIG
Ground
Reference
Signal Source
AI 0 +
AI 0 –
AI 7 +
AI 7 –
Chapter 2 Connecting Signals
NI PXI-4224 User Manual 2-8 ni.com
Figures 2-6 through 2-9 illustrate connecting signals using a terminal
block.
Figure 2-6. Unshielded Floating Signal Source Connection Using a Terminal Block
+
Tw i sted-Pair
Wiring
AI 0 +
AI 0 –
CH 0
V
SIG
Signal Source
Terminal Block
AI 7 +
AI 7 –
CH 7
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National Instruments NI PXI-4224 User manual

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