Page 3 - Important Information; Warranty; Patents; WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
Important Information Warranty The NI 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 defective...
Page 4 - Compliance; Determining FCC Class; Class A; Federal Communications Commission; Compliance with EU Directives
Compliance Compliance with FCC/Canada Radio Frequency Interference Regulations 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 (fo...
Page 5 - Contents; About This Manual
© National Instruments Corporation v NI 7831R User Manual Contents About This Manual Conventions ................................................................................................................... viiReconfigurable I/O Documentation ......................................................
Page 6 - Glossary
Contents NI 7831R User Manual vi ni.com Single-Ended Connection Considerations ...................................................... 2-12 Single-Ended Connections for Floating Signal Sources (RSE Input Mode).......................................................................... 2-13 Single-Ended...
Page 7 - Conventions; File»Page Setup»Options; bold
© National Instruments Corporation vii NI 7831R User Manual About This Manual This manual describes the electrical and mechanical aspects of the National Instruments 7831R device and contains information concerning its operation and programming. The NI 7831R device is a Reconfigurable I/O (RIO) devi...
Page 8 - Reconfigurable I/O Documentation; Start»Program Files»National
About This Manual NI 7831R User Manual viii ni.com programs, subprograms, subroutines, device names, functions, operations, variables, filenames, and extensions. Reconfigurable I/O Documentation The NI 7831R User Manual is one piece of the documentation set for your RIO system and application. Depen...
Page 9 - Related Documentation
About This Manual © National Instruments Corporation ix NI 7831R User Manual Related Documentation The following documents contain information you might find helpful: • NI Developer Zone tutorial, Field Wiring and Noise Considerations for Analog Signals , at ni.com/zone • PICMG CompactPCI 2.0 R3.0 •...
Page 10 - Introduction
© National Instruments Corporation 1-1 NI 7831R User Manual 1 Introduction This chapter describes the NI 7831R, describes the concept of the Reconfigurable I/O device, describes the optional software and equipment, and contains information about the NI 7831R. About the NI 7831R The NI 7831R is an R ...
Page 11 - Using PXI with CompactPCI
Chapter 1 Introduction NI 7831R User Manual 1-2 ni.com between devices. The NI PXI-7831R accesses the RTSI bus through the PXI trigger lines implemented on the PXI backplane. Refer to Appendix A, Specifications , for detailed NI 7831R specifications. Using PXI with CompactPCI Using PXI-compatible pr...
Page 12 - Overview of Reconfigurable I/O; Reconfigurable I/O Concept; PXI Pin Name
Chapter 1 Introduction © National Instruments Corporation 1-3 NI 7831R User Manual Overview of Reconfigurable I/O This section explains reconfigurable I/O and describes how to use the FPGA Module to build high-level functions in hardware. Refer to Chapter 2, Hardware Overview of the NI 7831R , for d...
Page 13 - Device-Embedded Logic and Processing
Chapter 1 Introduction NI 7831R User Manual 1-4 ni.com User-Defined I/O Resources You can create your own custom measurements using the fixed I/O resources. For example, one application might require an event counter that increments when a rising edge appears on any of three digital input lines. Ano...
Page 14 - Reconfigurable I/O Applications; Software Development; LabVIEW FPGA Module
Chapter 1 Introduction © National Instruments Corporation 1-5 NI 7831R User Manual The FPGA logic provides timing, triggering, processing, and custom I/O measurements. Each fixed I/O resource used by the application uses a small portion of the FPGA logic that controls the fixed I/O resource. The bus...
Page 15 - Start»Program Files»; LabVIEW Real-Time Module
Chapter 1 Introduction NI 7831R User Manual 1-6 ni.com You can use Interactive Front Panel Communication to communicate directly with the VI running on the FPGA. You can use Programmatic FPGA Interface Communication to programmatically control and communicate with FPGA VIs from host VIs. Use the FPG...
Page 16 - Cables and Optional Equipment; Cable
Chapter 1 Introduction © National Instruments Corporation 1-7 NI 7831R User Manual Cables and Optional Equipment National Instruments offers a variety of products you can use with R Series devices, including cables, connector blocks, and other accessories, as shown in Table 1-2. Table 1-2. Cables an...
Page 17 - Custom Cabling
Chapter 1 Introduction NI 7831R User Manual 1-8 ni.com Refer to Appendix B, Connecting I/O Signals , for more information about using these cables and accessories to connect I/O signals to the NI 7831R. Refer to ni.com/catalog for the most current cabling options. Custom Cabling NI offers a variety ...
Page 18 - Pollution Degree 1
Chapter 1 Introduction © National Instruments Corporation 1-9 NI 7831R User Manual Safety Information The following section contains important safety information that you must follow when installing and using the NI 7831R. Do not operate the NI 7831R in a manner not specified in this document. Misus...
Page 19 - Installation Category I
Chapter 1 Introduction NI 7831R User Manual 1-10 ni.com Operate the NI 7831R at or below the installation category 1 listed in the section Maximum working voltage , in Appendix A, Specifications . Measurement circuits are subjected to working voltages 2 and transient stresses (overvoltage) from the ...
Page 22 - Analog Input
Chapter 2 Hardware Overview of the NI 7831R © National Instruments Corporation 2-3 NI 7831R User Manual Figure 2-3. Parts Locator Diagram for the NI PCI-7831R Analog Input The NI 7831R has eight independent, 16-bit AI channels that you can sample simultaneously or at different rates. The input mode ...
Page 23 - Input Modes; Input Description; Input Mode
Chapter 2 Hardware Overview of the NI 7831R NI 7831R User Manual 2-4 ni.com Input Modes The NI 7831R input mode is software configurable. The input channels support three input modes—differential (DIFF), referenced single-ended (RSE), and nonreferenced single-ended (NRSE). The selected input mode ap...
Page 24 - Connecting Analog Input Signals
Chapter 2 Hardware Overview of the NI 7831R © National Instruments Corporation 2-5 NI 7831R User Manual Connecting Analog Input Signals The AI signals for the NI 7831R are AI<0..7>+, AI<0..7> –, AIGND, and AISENSE. The AI<0..7>+ and AI<0..7>– signals are connected to the eigh...
Page 26 - Types of Signal Sources; Floating Signal Sources
Chapter 2 Hardware Overview of the NI 7831R © National Instruments Corporation 2-7 NI 7831R User Manual Types of Signal Sources When configuring the input channels and making signal connections, you must first determine whether the signal sources are floating or ground referenced. The following sect...
Page 28 - Differential Connection Considerations (DIFF Input Mode)
Chapter 2 Hardware Overview of the NI 7831R © National Instruments Corporation 2-9 NI 7831R User Manual Differential Connection Considerations (DIFF Input Mode) In DIFF input mode, the NI 7831R measures the difference between the positive and negative inputs. DIFF input mode is ideal for measuring g...
Page 31 - Single-Ended Connection Considerations
Chapter 2 Hardware Overview of the NI 7831R NI 7831R User Manual 2-12 ni.com You can fully balance the signal path by connecting another resistor of the same value between the positive input and AIGND, as shown in Figure 2-7. This fully balanced input mode offers slightly better noise rejection but ...
Page 33 - Common-Mode Signal Rejection Considerations
Chapter 2 Hardware Overview of the NI 7831R NI 7831R User Manual 2-14 ni.com positive and negative inputs of the instrumentation amplifier. The instrumentation amplifier rejects this difference. If the input circuitry of a NI 7831R is referenced to ground in RSE input mode, this difference in ground...
Page 34 - Analog Output; Connecting Analog Output Signals; Output Description
Chapter 2 Hardware Overview of the NI 7831R © National Instruments Corporation 2-15 NI 7831R User Manual Analog Output The NI 7831R has eight 16-bit AO channels. The bipolar output range is fixed at ± 10 V. Some applications require that the AO channels power on to known voltage levels. To set the p...
Page 35 - Connecting Digital I/O Signals
Chapter 2 Hardware Overview of the NI 7831R NI 7831R User Manual 2-16 ni.com Figure 2-10. Analog Output Connections Digital I/O The NI 7831R has 96 bidirectional DIO lines that you can individually configure for either input or output. When the system powers on, the DIO lines are high-impedance. To ...
Page 38 - RTSI Trigger Bus; Digital Lines
Chapter 2 Hardware Overview of the NI 7831R © National Instruments Corporation 2-19 NI 7831R User Manual paired with power or ground. Because the DIO lines that are twisted with other DIO lines can couple noise onto each other, use these lines for static signals or non-edge-sensitive, low-frequency ...
Page 40 - Switch Settings
Chapter 2 Hardware Overview of the NI 7831R © National Instruments Corporation 2-21 NI 7831R User Manual The left local bus lines from the left peripheral slot of a PXI backplane (Slot 2) are routed to the star trigger lines of up to 13 other peripheral slots in a two-segment PXI system. This config...
Page 41 - Power Connections
Chapter 2 Hardware Overview of the NI 7831R NI 7831R User Manual 2-22 ni.com 4. Reinsert the NI 7831R into the PXI/CompactPCI chassis or PCI computer. Refer to the Installing the Hardware section of the Getting Started with the NI 7831R document for installation instructions. 5. Plug in and power on...
Page 42 - Field Wiring Considerations
Chapter 2 Hardware Overview of the NI 7831R © National Instruments Corporation 2-23 NI 7831R User Manual Field Wiring Considerations Environmental noise can seriously affect the measurement accuracy of the device if you do not take proper care when running signal wires between signal sources and the...
Page 43 - Calibration; Loading Calibration Constants; Internal Calibration
© National Instruments Corporation 3-1 NI 7831R User Manual 3 Calibration Calibration is the process of determining and/or adjusting the accuracy of an instrument to minimize measurement and output voltage errors. On the NI 7831R, onboard calibration DACs (CalDACs) correct these errors. Because the ...
Page 44 - Start»All Programs»National Instruments»NI-RIO»; »Calibrate; External Calibration; Manual Calibration
Chapter 3 Calibration NI 7831R User Manual 3-2 ni.com If you have NI-RIO installed, you can find the internal calibration utility at Start»All Programs»National Instruments»NI-RIO» device »Calibrate 7831R Device . Device is the NI PXI-7831R or NI PCI-7831R device. Immediately after internal calibrat...
Page 46 - Accuracy Information; Dynamic Characteristics
Appendix A Specifications NI 7831R User Manual A-2 ni.com Overvoltage protection ...........................± 42 V Data transfers ..........................................Interrupts, programmed I/O Accuracy Information DC Transfer Characteristics INL ...................................................
Page 47 - Settling Time; Step Size
Appendix A Specifications © National Instruments Corporation A-3 NI 7831R User Manual Settling Time Crosstalk................................................. –80 dB, DC to 100 kHz Analog Output Output Characteristics Number of channels ............................... 8 single-ended, voltage output ...
Page 48 - DC Transfer Characteristics
Appendix A Specifications NI 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 49 - Reconfigurable FPGA; Level
Appendix A Specifications © National Instruments Corporation A-5 NI 7831R User Manual Digital logic levels Maximum output current I max (source)..................................... 5.0 mA I max (sink) ........................................ 5.0 mA Input leakage current ...............................
Page 50 - Calibration Certificates; Bus Interface
Appendix A Specifications NI 7831R User Manual A-6 ni.com Phase locked to PXI 10 MHzClock(NI PXI-7831R only) ....................Adds 350 ps jitter, 300 ps skew Additional frequency dependent jitter 40 MHz ............................................None 80 MHz .........................................
Page 51 - Physical
Appendix A Specifications © National Instruments Corporation A-7 NI 7831R User Manual by the digital outputs use the following equation: Where j is the number of digital outputs being used to source current. Power available at I/O connectors ......... +4.50 to +5.25 VDC at 1 A total, 250 mA per I/O ...
Page 52 - Storage Environment
Appendix A Specifications NI 7831R User Manual A-8 ni.com chassis, tested in accordance with IEC-60068-2-1 and IEC-60068-2-2 Relative humidity range..........................10 to 90%, noncondensing, tested in accordance with IEC-60068-2-56 Altitude .....................................................
Page 53 - Safety; Electromagnetic Compatibility; CE Compliance
Appendix A Specifications © National Instruments Corporation A-9 NI 7831R User Manual Safety This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use: • IEC 61010-1, EN 61010-1 • UL 3111-1, UL 61010B-...
Page 57 - Connecting to CompactRIO Extension I/O Chassis
Appendix B Connecting I/O Signals NI 7831R User Manual B-4 ni.com Connecting to CompactRIO Extension I/O Chassis You can use the CompactRIO R Series Expansion chassis and CompactRIO I/O modules with the NI 7831R. Refer to the CompactRIO R Series Expansion System Installation Instructions for informa...
Page 58 - Connecting to 5B and SSR Signal Conditioning
Appendix B Connecting I/O Signals © National Instruments Corporation B-5 NI 7831R User Manual Connecting to 5B and SSR Signal Conditioning NI provides cables that allow you to connect signals from the NI 7831R directly to 5B backplanes for analog signal conditioning and SSR backplanes for digital si...
Page 64 - Symbol
© National Instruments Corporation G-1 NI 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 to. –...
