Page 3 - Important Information; Warranty; Patents; WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
Important Information Warranty The NI PXI-7831R 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 defec...
Page 4 - Compliance; FCC/Canada Radio Frequency Interference Compliance; Determining FCC Class; Class A; Federal Communications Commission; Compliance to EU Directives
Compliance FCC/Canada Radio Frequency Interference Compliance Determining FCC Class The Federal Communications Commission (FCC) has rules to protect wireless communications from interference. The FCC places digital electronics into two classes. These classes are known as Class A (for use in industri...
Page 5 - Contents; About This Manual
© National Instruments Corporation v NI PXI-7831R User Manual Contents About This Manual Conventions ................................................................................................................... viiReconfigurable I/O Documentation ..................................................
Page 6 - Glossary
Contents NI PXI-7831R User Manual vi ni.com Differential Connections for Ground-Referenced Signal Sources ... 2-8Differential Connections for Nonreferenced or Floating Signal Sources ................................................................. 2-9 Single-Ended Connection Considerations ...........
Page 7 - Conventions; File»Page Setup»Options; bold
© National Instruments Corporation vii NI PXI-7831R User Manual About This Manual This manual describes the electrical and mechanical aspects of the National Instruments PXI-7831R device and contains information concerning its operation and programming. The NI PXI-7831R device is a Reconfigurable I/...
Page 8 - Reconfigurable I/O Documentation
About This Manual NI PXI-7831R User Manual viii ni.com programs, subprograms, subroutines, device names, functions, operations, variables, filenames and extensions, and code excerpts. Reconfigurable I/O Documentation The NI PXI-7831R User Manual is one piece of the documentation set for your RIO sys...
Page 9 - Introduction; About the Reconfigurable I/O Devices
© National Instruments Corporation 1-1 NI PXI-7831R User Manual 1 Introduction This chapter describes the NI PXI-7831R, describes the concept of the Reconfigurable I/O (RIO) device, lists what you need to get started, describes the optional software and optional equipment, explains how to unpack the...
Page 10 - Using PXI with CompactPCI
Chapter 1 Introduction NI PXI-7831R User Manual 1-2 ni.com The PXI chassis has the Real-Time System Integration (RTSI) bus to easily synchronize several measurement functions to a common trigger or timing event. The RTSI bus is implemented on the PXI trigger bus on the PXI backplane. The RTSI bus ca...
Page 11 - What You Need to Get Started; Getting Started with Windows 2000/XP; PXI Pin Name
Chapter 1 Introduction © National Instruments Corporation 1-3 NI PXI-7831R User Manual What You Need to Get Started This section contains two lists that detail what you need to get started using the NI PXI-7831R with Windows 2000/XP or the RT Module. Getting Started with Windows 2000/XP To set up an...
Page 12 - Help; Getting Started with the RT Module
Chapter 1 Introduction NI PXI-7831R User Manual 1-4 ni.com ❑ The following documents are included on the NI Device Drivers CD and are also available at ni.com/manuals (optional): – LabVIEW FPGA Module Release Notes – LabVIEW FPGA Module User Manual – Where to Start with the NI PXI-7831R ❑ The LabVIE...
Page 13 - Overview of Reconfigurable I/O; Reconfigurable I/O Concept
Chapter 1 Introduction © National Instruments Corporation 1-5 NI PXI-7831R User Manual ❑ The following documents are included on the NI Device Drivers CD and are also available at ni.com/manuals (optional): – LabVIEW FPGA Module Release Notes – LabVIEW FPGA Module User Manual – LabVIEW Real-Time Mod...
Page 14 - Device-Embedded Logic and Processing
Chapter 1 Introduction NI PXI-7831R User Manual 1-6 ni.com User-Defined I/O Resources With the RIO device, you can define both the combination of I/O resources and the I/O resources themselves. You can also create new building blocks on top of fixed I/O resources. For example, one application might ...
Page 16 - Reconfigurable I/O Applications; Software Development
Chapter 1 Introduction NI PXI-7831R User Manual 1-8 ni.com Figure 1-3. FPGA Logic Use in an Application with Higher-Level Functions The FPGA is volatile and does not retain the VI when it is powered off. Therefore, the VI must be reloaded every time power is turned on. The VI comes from onboard flas...
Page 17 - FPGA Module; RT Module; Cables and Optional Equipment
Chapter 1 Introduction © National Instruments Corporation 1-9 NI PXI-7831R User Manual FPGA Module The FPGA Module enables you to use LabVIEW to create VIs that run on the RIO device, which contains a reconfigurable FPGA. The FPGA Module includes a new function palette, which contains functions that...
Page 18 - Custom Cabling; Cable
Chapter 1 Introduction NI PXI-7831R User Manual 1-10 ni.com Refer to Appendix B, Connecting I/O Signals , for more information on using these cables and accessories to connect I/O signals to the PXI-7831R. For the most up-to-date cabling options, refer to ni.com/catalog or call the sales office near...
Page 19 - Unpacking
Chapter 1 Introduction © National Instruments Corporation 1-11 NI PXI-7831R User Manual SHC68-NT-S (NI part #189041-02) connects to the NI PXI-7831R VHDCI connectors on one end of the cable. The other end of the cable is not terminated. This cable ships with a wire list identifying which wire corres...
Page 23 - Analog Input; Input Description
Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-2 ni.com Figure 2-2. Parts Locator Diagram for the NI PXI-7831R Analog Input The NI PXI-7831R has eight independent, 16-bit AI channels that can be simultaneously sampled or sampled at different rates. The input mode is softw...
Page 24 - Input Modes; Input Mode
Chapter 2 Hardware Overview of the NI PXI-7831R © National Instruments Corporation 2-3 NI PXI-7831R User Manual Input Modes The NI PXI-7831R input mode is software configurable. The input channels support three input modes—differential (DIFF) input, referenced single-ended (RSE) input, and nonrefere...
Page 25 - Connecting Analog Input Signals
Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-4 ni.com Connecting Analog Input Signals The AI signals for the NI PXI-7831R are AI<0..7>+, AI<0..7> –, AIGND, and AISENSE. The AI<0..7>+ and AI<0..7>– signals are tied to the eight AI channels of the ...
Page 26 - Types of Signal Sources
Chapter 2 Hardware Overview of the NI PXI-7831R © National Instruments Corporation 2-5 NI PXI-7831R User Manual Figure 2-3. NI PXI-7831R Instrumentation Amplifier The instrumentation amplifier applies common-mode voltage rejection and presents high input impedance to the AI signals connected to the ...
Page 27 - Floating Signal Sources
Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-6 ni.com Floating Signal Sources A floating signal source is in no way connected to the building ground system but instead has an isolated ground-reference point. Some examples of floating signal sources are outputs of transf...
Page 29 - Differential Connection Considerations (DIFF Input Mode)
Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-8 ni.com Differential Connection Considerations (DIFF Input Mode) In DIFF input mode, the NI PXI-7831R measures the difference between the positive and negative inputs. DIFF input mode is ideal for measuring ground-referenced...
Page 32 - Single-Ended Connection Considerations
Chapter 2 Hardware Overview of the NI PXI-7831R © National Instruments Corporation 2-11 NI PXI-7831R User Manual the source, other than the very high-input impedance of the instrumentation amplifier. You can fully balance the signal path by connecting another resistor of the same value between the p...
Page 34 - Common-Mode Signal Rejection Considerations
Chapter 2 Hardware Overview of the NI PXI-7831R © National Instruments Corporation 2-13 NI PXI-7831R User Manual amplifier, and the signal local ground reference is connected to the negative input of the instrumentation amplifier. The ground point of the signal should, therefore, be connected to AIS...
Page 35 - Analog Output; Connecting Analog Output Signals; Output Description
Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-14 ni.com common-mode signals as long as V+ in and V– in (input signals) are both within their specified input ranges. Refer to Appendix A, Specifications , for more information about input ranges. Analog Output The NI PXI-78...
Page 36 - Connecting Digital I/O Signals
Chapter 2 Hardware Overview of the NI PXI-7831R © National Instruments Corporation 2-15 NI PXI-7831R User Manual Figure 2-9. Analog Output Connections Digital I/O The NI PXI-7831R has 96 bidirectional DIO lines that can be individually configured for either input or output. When the system powers on...
Page 39 - PXI Trigger Bus; Digital Lines
Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-18 ni.com edge-sensitive or high-frequency digital signals on the DIO lines that are paired with power or ground. Because the DIO lines that are twisted with other DIO lines can couple noise onto each other, these lines shoul...
Page 40 - PXI Local Bus
Chapter 2 Hardware Overview of the NI PXI-7831R © National Instruments Corporation 2-19 NI PXI-7831R User Manual Caution Do not drive the same PXI trigger bus line on the same PXI bus segment with the NI PXI-7831R and another device simultaneously. Such signal driving can damage both devices. NI is ...
Page 41 - Switch Settings
Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-20 ni.com other peripheral slots and results in very precise trigger timing signals. For example, an NI PXI-7831R in slot 2 can send out an independent trigger signal to each device plugged into slots <3..15> using the ...
Page 42 - Power Connections; Field Wiring Considerations
Chapter 2 Hardware Overview of the NI PXI-7831R © National Instruments Corporation 2-21 NI PXI-7831R User Manual flash memory, repeat the procedure above but return switch 1 to the OFF position in step 3. Note When the NI PXI-7831R is powered on with switch 1 in the ON position, the analog circuitry...
Page 44 - Calibration; Loading Calibration Constants; Internal Calibration
© National Instruments Corporation 3-1 NI PXI-7831R User Manual 3 Calibration Calibration refers to the process of minimizing measurement and output voltage errors. On the NI PXI-7831R, these errors are corrected in the analog circuitry by onboard calibration DACs (CalDACs). Because calibration is h...
Page 45 - External Calibration; Manual Calibration
Chapter 3 Calibration NI PXI-7831R User Manual 3-2 ni.com onboard voltage reference. The offset and gain errors in the analog circuitry are calibrated out by adjusting the CalDACs to minimize these errors. Immediately after internal calibration, the only significant residual calibration error should...
Page 47 - Accuracy Information; Dynamic Characteristics
Appendix A Specifications NI PXI-7831R User Manual A-2 ni.com Overvoltage protection ...........................±42 V Data transfers ..........................................Interrupts, programmed I/O Accuracy Information DC Transfer Characteristics INL.................................................
Page 48 - Step Size
Appendix A Specifications © National Instruments Corporation A-3 NI PXI-7831R User Manual Settling time Crosstalk................................................. –80 dB, DC to 100 kHz Analog Output Output Characteristics Number of channels ............................... 8 single-ended, voltage out...
Page 49 - DC Transfer Characteristics
Appendix A Specifications NI PXI-7831R User Manual A-4 ni.com DC Transfer Characteristics INL..........................................................±0.5 LSB typ, ±4.0 LSB max DNL ........................................................±0.5 LSB typ, ±1 LSB max Monotonicity ...........................
Page 50 - Reconfigurable FPGA; Level
Appendix A Specifications © National Instruments Corporation A-5 NI PXI-7831R User Manual Digital I/O Number of channels NI PXI-7831R ................................. 96 input/output Compatibility ......................................... TTL Digital logic levels Maximum output current Power-on sta...
Page 51 - Calibration Certificates
Appendix A Specifications NI PXI-7831R User Manual A-6 ni.com Timebase accuracy With onboard base clock .................±100 ppm Phase locked to PXI 10 MHz clock.......................±350 ps jitter, 300 ps skew (max) Calibration Recommended warm-up time .................15 minutes Calibration inte...
Page 52 - Physical; Maximum Working Voltage
Appendix A Specifications © National Instruments Corporation A-7 NI PXI-7831R User Manual Physical Dimensions (not including connectors) .................... 16.0 by 10.0 cm (6.3 by 3.9 in.) I/O connectors NI PXI-7831R ................................. Three 68-pin female high-density VHDCI type Max...
Page 53 - Electromagnetic Compatibility; CE Compliance; Declaration
Appendix A Specifications NI PXI-7831R User Manual A-8 ni.com Electromagnetic Compatibility Emissions ................................................EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Immunity ................................................EN 61326-1:1997 + A2:2001, Table 1 EMC/EMI ...
Page 58 - Connecting to 5B and SSR Signal Conditioning
Appendix B Connecting I/O Signals © National Instruments Corporation B-5 NI PXI-7831R User Manual Connecting to 5B and SSR Signal Conditioning NI provides cables that allow you to connect signals from the NI PXI-7831R directly to 5B backplanes for analog signal conditioning and SSR backplanes for di...
Page 63 - Quick Reference Label; SCB-68 Quick Reference Label
Appendix C Using the SCB-68 Shielded Connector Block NI PXI-7831R User Manual C-2 ni.com Quick Reference Label Figure C-2 shows the pinout that appears on the SCB-68 quick reference label that ships with the NI PXI-7831R. Figure C-2. SCB-68 Quick Reference Label for the NI PXI-7831R S1 NC = No Conne...
Page 65 - Calibration Certificate
Appendix D Technical Support and Professional Services NI PXI-7831R User Manual D-2 ni.com • Calibration Certificate —If your product supports calibration, you can obtain the calibration certificate for your product at ni.com/calibration . If you searched ni.com and could not find the answers you ne...
Page 66 - Symbol
© National Instruments Corporation G-1 NI PXI-7831R User Manual Glossary Symbol Prefix Value p pico 10 – 12 n nano 10 – 9 µ micro 10 – 6 m milli 10 – 3 k kilo 10 3 M mega 10 6 G giga 10 9 Numbers/Symbols ° Degrees. > Greater than. ≥ Greater than or equal to. < Less than. ≤ Less than or equal t...
