National Instruments NI PXI-7831R - Manuals

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 ...........

© 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/...

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...

© 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...

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...

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...

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...

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...

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 ...

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...

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...

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...

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...

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...

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...

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 ...

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 ...

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...

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...

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...

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...

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...

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...

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...

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 ...

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 ...

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...

© 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...

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...

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

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...

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

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...

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...

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...

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 ...

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...

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...

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...

© 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...