National Instruments NI 7831R - Manuals

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...

© 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...

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...

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 •...

© 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 ...

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...

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...

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...

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...

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...

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...

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 ...

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...

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 ...

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 ...

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...

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...

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...

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...

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 ...

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...

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...

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 ...

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 ...

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...

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...

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...

© 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 ...

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...

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 ...................................................

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 ...

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 ..........................

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 ...............................

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 .........................................

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 ...

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 .....................................................

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-...

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...

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...

© 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. –...