National Instruments NI PXI-7831R manual

Reconfigurable I/O NI PXI-7831R User Manual Reconfigurable I/O Devices for PXI/CompactPCI Bus Computers NI PXI-7831R User Manual April 2003 Edition Part Number 3704 89A-01[...]

Support Worldwide Technical Support and Product Info rmation ni.com National Instruments Corporate Headquarters 11500 North Mopac Expressway Aust in, Texas 78759-3504 USA Tel: 512 683 0100 Worldwide Offices Australia 61 2 9672 8846, Austria 43 0 6 62 45 79 90 0, Belgium 32 0 2 757 00 20, Brazil 55 11 3262 3599, Canada (Calgary) 403 274 9391, Canada[...]

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, a s evidenced by receipts or other documentati on. National Instruments wil l, at its option, repair or replace equipment that proves to be def ective during the warranty period. This warrant [...]

Compliance FCC/Canada Radio Frequency Interference Compliance Determining FCC Class The Federal Communications Commission (FCC) has rules to protect wireless co mmunications from inte rference. The FCC places digital electronics into two classes. These classes are known as Class A (for use in industrial-commercial locations onl y) or Class B (for u[...]

© National Instruments Corporation v NI PXI-7831R User Manual Contents About This Manual Conventions ............ .............. ........... .............. ............ .............. .............. ........... ............. v ii Reconfigurable I/O Documentation ............. ........ ... .............. ........... .............. ............ ....[...]

Contents NI PXI-7831R User Manual vi ni.com Differential Connections for Groun d-Referenced Signal Sources ... 2-8 Differential 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-7 831R device and contains information concerning its operation and program ming. The NI PXI-7831R device is a Reconfigurable I/O (RIO) device. The NI PXI-7831R contains eight[...]

About This Manual NI PXI-7831R User Manual viii ni.com programs, subprograms, su broutines, d e vice names, functions, operations, variables, filenames and e xtensions, and code excerpts. Reconfigurable I/O Documentation The NI PXI-7831R User Manual is one piece of the documentation set for your RIO system and application . Depending on the hardwar[...]

© National Instruments Corporation 1-1 NI PXI-7831R User Manual 1 Introduction This chapter describes the NI PXI-7831R, describes the concep t of the Reconfigurable I/O (RIO) device, lis ts what you need to get sta rted, describes the optional software an d optional equipment, explains how to unpack the hardware, and contai ns safety information a[...]

Chapter 1 Introduction NI PXI-7831R User Manual 1- 2 ni.com The PXI chassis has the Real-T ime Syst em Integration (R TSI) bus to easily synchronize sev eral measurement functions to a common trigg er or timing ev en t. The R T SI bus is implemented on the PXI tr igger bus on the PXI backplane. The R TSI bus can route ti ming and trigger signals be[...]

Chapter 1 Introduction © National Instruments Corporation 1-3 NI PXI-7831R User Manual What Y ou Need to Get Started This section contains two list s that detail what you need to get star ted using the NI PXI-7831R with Windows 2000/XP or the RT Module. Getting Started with Windows 2000/XP To set up and use the NI PX I-7831R with Windows 2 000/XP,[...]

Chapter 1 Introduction NI PXI-7831R User Manual 1- 4 ni.com ❑ The follo wing documents are included on the NI De vice Drivers CD and are also av ailable at ni.com/manuals (option al): – LabVIEW FPGA Module Release Notes – LabVIEW FPGA Module User Manual – Where to Start with the NI PXI-7831R ❑ The LabVIEW Hel p , which is a vailable b y s[...]

Chapter 1 Introduction © National Instruments Corporation 1-5 NI PXI-7831R User Manual ❑ The follo wing documents are included on the NI De vice Drivers CD and are also av ailable at ni.com/manuals (option al): – LabVIEW FPGA Module Release Notes – LabVIEW FPGA Module User Manual – LabVIEW Real-Time Module User Manual – Where to Start wi[...]

Chapter 1 Introduction NI PXI-7831R User Manual 1- 6 ni.com User -Defined I/O Resources With the RIO device, y ou can define bo th 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 appl ication might require an event counter that increments when[...]

Chapter 1 Introduction © National Instruments Corporation 1-7 NI PXI-7831R User Manual the connectivity between the b us inte rface and the f ix ed I/O, including any timing, triggering, processing, an d custom I/O required by the application. T iming, triggering, processing, and custom I/O is provided by consuming logic in the FPGA. Each fixed I/[...]

Chapter 1 Introduction NI PXI-7831R User Manual 1- 8 ni.com Figure 1-3. FPGA Logic Use in an Applicati on with Higher -Level Functions The FPGA is volatile and does not retain the VI when it is powered of f . Therefore, the VI must be reloaded e very time po wer is turned on. The VI comes from onboard flash memory or from the so ftware ov er the bu[...]

Chapter 1 Introduction © National Instruments Corporation 1-9 NI PXI-7831R User Manual FPGA Module The FPGA Module enables you t o use LabVIEW to create VIs that run on the RIO device, which contains a reconfigurable FPGA. The FPGA Module includes a new functi on palette, which contai ns functions that run on the FPGA on the RIO device. These func[...]

Chapter 1 Introduction NI PXI-7831R User Manual 1-10 ni.com Refer to Appendix B, Connecting I/O Signals , for more infor mation 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 of fice nearest to you. Custom Cabling NI offers a variety o[...]

Chapter 1 Introduction © National Instruments Corporation 1-11 NI PXI-7831R User Manual SHC68-NT-S (NI part #189041-02) c onnects 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 corresponds to which NI PXI-783 1R pin. Using this cab[...]

Chapter 1 Introduction NI PXI-7831R User Manual 1-12 ni.com Do not substitute parts or modify the NI PXI-7831R except as describ ed in this document. Use th e NI PXI-7831R only with the chassis, modules, accessories, and cables specif ied in the installation instructions. Y ou must hav e all covers and f iller panels installed during operation of t[...]

Chapter 1 Introduction © National Instruments Corporation 1-13 NI PXI-7831R User Manual standard impulse withstan d voltage le vels that commonl y occur in electrical distribution systems. The following is a description of installation categories: • Installation Category I is for measur ements performed on circuits not directly connected to the [...]

© National Instruments Corporation 2-1 NI PXI-7831R User Manual 2 Hardware Over view of the NI PXI-7831R This chapter presents an overview of the hardware functi ons and I/O connectors on the NI PXI-7 831R. Figure 2-1 shows a block diagram for the NI PXI-7831R, and Figure 2-2 sho ws the parts locator diag rams for the NI PXI-7831R. Figure 2-1. NI [...]

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 d ifferent rates. The input m ode is software configurable, and the input range is fixed [...]

Chapte r 2 Hardware Ov erview of the N I PXI-78 31R © 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 inp ut modes—di fferential (D IFF) input, referenced single-ended (RSE) input, and nonreferenced sing le-ended (NRSE) input. The sel[...]

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 N I PXI-7831 R 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 NI PX I-7831R. Fo r all input modes, the A[...]

Chapte r 2 Hardware Ov erview of the N I PXI-78 31R © National Instruments Corporation 2-5 NI PXI-7831R User Manual Figure 2-3. NI PXI-7831R Instrumentation Amplifier The instrumentation amplifier app lies common-mode vo ltage rejection and presents high input impedance to the AI signals connected to the NI PXI-7831R. Signals are routed to the pos[...]

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 poi nt. Some examples of floating signal sources are output s of transformer s, thermocouples, battery-powered devices[...]

Chapte r 2 Hardware Ov erview of the N I PXI-78 31R © National Instruments Corporation 2-7 NI PXI-7831R User Manual Figure 2-4. Summary of Analog Input Connections + – + – V 1 AI< i > AISENSE AIGND< i > + – + – V 1 AI< i > AISENSE AIGND< i > See text f or information on bias resistors. + – + – V 1 AI< i > [...]

Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2- 8 ni.com Differential Connection Consid erations (DIFF Input Mode) In DIFF input mode, the NI PXI-7831R measures the difference between the positive and negative inpu ts. DIFF input mode is ideal for measur ing ground-referenced signals from other devices. When using DIFF i[...]

Chapte r 2 Hardware Ov erview of the N I PXI-78 31R © National Instruments Corporation 2-9 NI PXI-7831R User Manual Figure 2-5. Differential Input Connections for Ground-Referenced Signals W i th this connection type, the instrumen tation amplifier rejects both the common-mode noise in the signal and the groun d potential difference between the si[...]

Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-10 ni.com Figure 2-6. Differential Input Connections for Nonreferenced Signals Figure 2-6 shows two bias resistors connected in parallel with the signal leads of a floating signal source. If you do not use the resistors and the source is truly floating, the source is not lik[...]

Chapte r 2 Hardware Ov erview of the N I PXI-78 31R © National Instruments Corporation 2-11 NI PXI-7831R User Manual the source, other than the very high-i nput impedance of the instrumentation amplifier . Y ou can fully balance the signal path by connecting another resistor of the same value between the positi ve input and AIGND, as sho wn in Fig[...]

Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-12 ni.com the NI PXI-7831R provides the reference ground point for the external signal. The NRSE input mode is used for ground-referenced signal sources; in this case, the external signal supp lies its o wn reference ground point and the NI PXI-7831R should not suppl y one. [...]

Chapte r 2 Hardware Ov erview of the N I PXI-78 31R © National Instruments Corporation 2-13 NI PXI-7831R User Manual amplifier, and the signal local gro und re ference is connected to the negative input of the instrumentation amplifier. The gro und point of the signal should, therefore, be connected to AISENSE. Any potential difference between the[...]

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 A ppendix A, Specifications , for more informati on about input ranges. Analog Output The NI PXI-7831R has eight 16-bit AO channels. The bi polar[...]

Chapte r 2 Hardware Ov erview of the N I PXI-78 31R © National Instruments Corporation 2-15 NI PXI-7831R User Manual Figure 2-9. An alog Output Connections Digital I/O The NI PXI-7831R has 96 bi directional DIO lines that can be individually configured for either input or output. When the system powers on, the DIO lines are all high-impedance. To [...]

Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-16 ni.com device s. Because the NI PXI-7831R digital outputs pr o vide a nominal output swing of 0 to 3.3 V (3.3 V TTL), the NI PXI-7831R DIO lines cannot driv e 5 V CMOS logic lev els . T o interface to 5 V CMOS de vices, you must provide an external pull-up resi stor to 5 [...]

Chapte r 2 Hardware Ov erview of the N I PXI-78 31R © National Instruments Corporation 2-17 NI PXI-7831R User Manual Figure 2-10 shows signal connections for three typical DIO applications. Figure 2-10. Example Digital I/O Connections Figure 2-10 shows DIO<0..3> configured for digital input and DIO<4..7> configured for digital ou tput.[...]

Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-18 ni.com edge-sensiti ve or high-frequenc y digi tal signals on the DIO lines that are paired with po wer or ground. Because the DIO lines that are twisted with other DIO lines can couple noise onto each other , these lines should be used for static signals or for non-edg e[...]

Chapte r 2 Hardware Ov erview of the N I PXI-78 31R © National Instruments Corporation 2-19 NI PXI-7831R User Manual Caution Do not d ri ve the same PXI trigger bus line on the same PXI bus segment with the NI PXI-7831R and another de vice simultaneously . Such signal driving can damage both devices. NI is not liable for any damage resulting from [...]

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 e xample, an NI PXI-7831R in slot 2 can send out an independent trigger signal to each de vice plugge d into slots <3..15> using the PXI/LBLST AR<0..12>. Each device recei ve[...]

Chapte r 2 Hardware Ov erview of the N I PXI-78 31R © National Instruments Corporation 2-21 NI PXI-7831R User Manual flash memory , repeat the procedure ab ove b ut return switch 1 to the OFF position in st ep 3. Note When the NI PXI-7831R is powered on with switch 1 in the ON po sition, the analog circuitry does not return properly calibrated da [...]

Chapter 2 Hardware Overview of the NI PXI-7831R NI PXI-7831R User Manual 2-22 ni.com through areas with lar ge magneti c fields or high electromagnetic interference. • Route signals to the de vice carefu lly . Keep cabling away from noise sources. The most common noise source in a PXI D A Q system is the video monitor . Separate the monitor from [...]

© National Instruments Corporation 3-1 NI PXI-7831R User Manual 3 Calibration Calibration refers to the process of minimizing m easurement and output voltage errors. On the NI PXI-7831R, these errors are corrected in the analog circuitry by onb oard calibration DACs (CalDACs). Because calibration is handled by the analog circuitry, the data read f[...]

Chapter 3 Calibr ation NI PXI-7831R User Manual 3- 2 ni.com onboard voltage reference. The offset an d gain errors in the analog circuitry are calibrated out by adjusting the CalD ACs to minimize these errors. Immediately after internal calibration, the only signi f icant residual calibration error should be gain error due to time and temperature d[...]

© National Instruments Corporation A- 1 NI PXI-7831R User Manual A Specifications This appendix list s the specifications of the NI PXI-7831R. These specifications are typical at 25 °C unless otherwise noted. Analog Input Input Characteristics Number of channels ........................ ....... 8 Input modes ............... .............. .......[...]

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 T ransfer Characteristics INL....................... ............... ........... .........±3 LSB typ, ±6 LSB max DNL[...]

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 output Resolution .............. ............[...]

Appendix A Specifications NI PXI-7831R User Manual A-4 ni.com DC T ransfer Characteristics INL....................... ............... .............. ......±0.5 LSB typ, ±4.0 LSB max DNL ................ .............. ........... .............. .±0.5 LSB typ, ±1 LSB max Monotonicity ............. .............. ......... ......16 bits, guarante[...]

Appendix A Specifications © National Instruments Corporation A- 5 NI PXI-7831R User Manual Digital I/O Number of channels NI PXI-7831R ....... ........... ............... 96 i nput/output Compatibility ...... .............. .............. ....... TTL Digital logic lev els Maximum output current Power-on state ................. .............. .....[...]

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, 30 0 ps skew (max) Calibration Recommended warm-up time .................15 minutes Calibration interval ............... .............. ....1 yea[...]

Appendix A Specifications © National Instruments Corporation A- 7 NI PXI-7831R User Manual Physical Dimensions (not including connectors) ..... ........... .... 16.0 by 10.0 c m (6.3 by 3.9 in.) I/O connectors NI PXI-7831R ..................... ............ Three 68-pin female high-density VHDCI type Maximum W orking Voltage Maximum working voltag[...]

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 ............ ............ .............. ...[...]

© National Instruments Corporation B- 1 NI PXI-7831R User Manual B Connecting I/O Signals This appendix describes how to make input and output signal connections to the NI PX I-7831R I/O connectors. The NI PXI-7831R has two DIO connectors with 40 DIO lines per connector , and one MIO connector with ei ght AI lines, eight A O lines, and 16 DIO line[...]

Appendix B Connecting I/O Signals NI PXI-7831R User Manual B-2 ni.com Figure B-1. NI PXI-7831R Connector Locations Figure B-2 shows the I/O connector pin assignments for the I/O connectors on the NI PXI-7831R. The DIO connector pin assignment appl ies to connectors<1..2> on the NI PXI-7831R. The MIO connector pin assignment applies to connect[...]

Appendix B Connecting I/O Signals © National Instruments Corporation B- 3 NI PXI-7831R User Manual Figure B-2. NI PXI-7831R I/O Connect or Pin Assignments T o access the signals on the I/O connect ors, you must conn ect a cable from the I/O connector to a signal acces sory . Plug the small VHDCI connector end of the cable into the appropriate I/O [...]

Appendix B Connecting I/O Signals NI PXI-7831R User Manual B-4 ni.com . Caution Connections that exceed any of the maximum ratings of input or outpu t signals on the NI PXI-7831R can damage th e NI PXI-7831R and the computer . Maxi mum input ratings for each signal are gi ven in the Protection column of T able B-2. NI is not liable for any damage r[...]

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 allo w yo u to connect signals from the NI PXI-7831R directly to 5B backplanes for analog signal conditi oning and SSR backplanes for digital signal cond itioning. Table B-2. NI PXI[...]

Appendix B Connecting I/O Signals NI PXI-7831R User Manual B-6 ni.com The NSC68-262650 cable is designed to connect the signals on the NI PXI-7831R MIO connector directly to 5B and SSR backplanes. This cable has a 68-pin male VHDCI connect or on one end that plugs into the NI PXI-7831R MIO connector . The other end of this cable provides two 26-pin[...]

Appendix B Connecting I/O Signals © National Instruments Corporation B- 7 NI PXI-7831R User Manual , Figure B-3. Connector Pinouts When Using NSC68-262650 Cable The NSC68-5050 cable is designed to connect th e signals on the NI PXI-7831R DIO connectors directly to SSR backplanes for digital signal conditioning. This cab le has a 68-pin male VHDCI [...]

Appendix B Connecting I/O Signals NI PXI-7831R User Manual B-8 ni.com lines on the NSC68- 5050 cable header . In this case, you only hav e access to the channels that exist on both the SSR backplane and the NSC68-5050 cable header you are using. Figure B-4 shows the connector pinouts when using the NSC68-5050 cable. Figure B-4. Con nector Pinouts W[...]

© National Instruments Corporation C- 1 NI PXI-7831R User Manual C Using the SCB-68 Shielded Connector Block This appendix describes how to connect input and output signals to the NI PXI-7831R with the SCB-68 shielded connect or block. The SCB-68 has 68 screw terminals for I/O signal connections. T o use the SCB-68 with the NI PXI-7831R, y ou must[...]

Appendix C Using the SCB-68 Shielded Connec tor Block NI PXI-7831R User Manual C-2 ni.com Quick Reference Label Figure C-2 shows the pinout that app ears 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 Connect 1 THE MIO COLUMN CORRESPONDS TO THE MIO CONNE[...]

© National Instruments Corporation D-1 NI PXI-7831R User Manual D T echnical Support and Professional Ser vices Visit the following sections of the National Instruments Web site at ni.com for technical support an d professional services: • Support —Online technical support resources include the following: – Self-Help Resources —For immedia[...]

Appendix D T echnical Supp ort and Professional Ser vices NI PXI-7831R User Manual D-2 ni.com • Calibration Certificate —If your product suppor ts calibration, you can obtain the calibration certif icate for your product at ni.com/calibration . If you searched ni.com and could not find the answers you need, contact your local off ice or NI corp[...]

© National Instruments Corporation G-1 NI PXI-7831R User Manual Glossar y Symbol Pref ix V alue pp i c o 1 0 –1 2 nn a n o 1 0 –9 µ micro 10 –6 m milli 10 –3 k kilo 10 3 Mm e g a 1 0 6 Gg i g a 1 0 9 Numbers/Symbols ° Degrees. > Greater than. ≥ Greater than or equal to. < Less than. ≤ Less than or equal to. – Negati ve of, or[...]

Glossary NI PXI-7831R User Manual G-2 © National Instruments Corporation Square root of. +5V +5 VDC source signal. A A Amperes. A/D Analog-to-digital . A C Alternating curren t. ADC Analog-to-digital con verter—an elect ronic de vi ce, often an integrated circuit, that con verts an an alog voltage to a digital number . AI Analog input. AI< i [...]

Glossary © National Instruments Corporation G-3 NI PXI-7831R User Manual C CC e l s i u s . CalD A C Calibration D AC. CH Channel—pin or wire lead to wh ich you apply or from which you read the analog or digital signal. Anal og signals can be single-ended or differential. For digital signals, you group channels to form ports. Ports usua lly cons[...]

Glossary NI PXI-7831R User Manual G-4 © National Instruments Corporation DIO Digital input /output. DIO< i > Digital input/ou tput channel signal. DMA Direct memory access—a method by wh ich data can be transferred to/from computer memory from/ to a de vice or memory on the bus while the processor does something else. DMA is th e fastest m[...]

Glossary © National Instruments Corporation G-5 NI PXI-7831R User Manual I I/O Input/output—the transfer of data to/from a comp uter system in v olving communications channels, operator interface de vices, and/or data acquisition and control interfaces. INL Relati ve accurac y . L LabVIEW Laboratory V irtual Instrument Engineering W orkbench. La[...]

Glossary NI PXI-7831R User Manual G-6 © National Instruments Corporation N noise An undesirable electrical signal—noise comes from external sources such as the A C power line, motors, generators, transformers, f luorescent lights, CR T displays, computers, electrical st orms, welders, radio transmitters, and internal sources such as semic onduct[...]

Glossary © National Instruments Corporation G-7 NI PXI-7831R User Manual R RAM Random-access memory—the generic term for the read/write memory that is used in computers. RAM allows bits and bytes to be written to it as well as read from. V arious types of RA M are DRAM, EDO RAM, SRAM, and VRAM. resolution The smallest signal increment that can b[...]

Glossary NI PXI-7831R User Manual G-8 © National Instruments Corporation T THD T otal harmonic distortion—the rat io of the total rms signal due to harmonic distortion to the overall rms signal, in decibel or a percentage. thermocouple A temperature se nsor created by joining tw o diss imilar metals. The junction produces a small voltage as a fu[...]