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Modular Instrumentation NI PCI-5911 User Manual High-Speed Digitizer with Flex ADC NI PCI-5911 User M anual ™ March 2 003 Edition Part Number 322150E-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 O.
Important Information Warranty The NI 5911 is war ranted agains t defects in materi als and workmanshi p for a period of on e year from the date of shipment, as ev idenced by receipts or other documentation. National Instruments wil l, at its option, repair or replace equi pment that proves to be defect ive during the warranty period.
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.
© National Instruments Corpor ation v NI PCI-5911 User Manual Contents About This Manual Conventions ............ .............. .............. ................. .............. .............. .............. ................ v ii Related Documentation .
Contents NI PCI-5911 User Manual vi ni.com Memory ............. ............... .............. .............. .............. ................. .............. .............. ...... 2-10 Triggering and Memory Usage .............. ................. .....
© National Instruments Corporat ion vii NI PCI-5911 User Manual About This Manual The NI 5911 User Manual provides information on instal ling, connecting signals to, and acquiring d ata from your NI 5 911 high-speed digitizer . This manual includes an ov ervie w of the NI 5911 and explains the operation of each functional unit of the NI 5911.
About This Manual NI PCI-5911 User Manual viii ni.com Related Documentation The following documents contain information that you mi ght find helpful as you read this manual: • Where to Start with Yo ur NI Digitizer • NI-SCOPE Software User Manual • NI-SCOPE Instrument Dri ver Quick Reference Guide Y ou can do wnload these documents from ni.
About This Manual © National Instruments Corpor ation ix NI PCI-5911 User Manual • Pollution Degree 3 means that conductiv e pollution occurs, or dry , nonconductiv e pollution occurs that becomes condu cti ve due to condensation. Y ou must insulate signal connections for th e maximum voltage for which the device is rated.
About This Manual NI PCI-5911 User Manual x ni.com outlets in the fix ed installation, and stationary motors with perm anent connections to fixed installations. • Installation Category IV is for measurement s performed at the primary electrical supply installation (<1,000 V).
© National Instruments Corporat ion 1-1 NI PCI-5911 User Manual 1 Introduction Thank you for buyin g an NI PCI-5911 digiti zer, featuring the Flex ADC for variable speed and resolution.
Chapter 1 Introduction NI PCI-5911 User Manual 1-2 ni.com Note The +5 V signal is fused at 1.1 A. Howe ve r , NI recommends limiting the current from this pin to 30 mA.
Chapter 1 Introduction © National Instruments Corporat ion 1-3 NI PCI-5911 User Manual Figure 1-2. 9-Pin Mini-Cir cular DIN Connector Acquiring Data with the NI 5911 You can acquire data either programm atically—by w ritin g an application for the NI 5911—or interactiv ely with the Scope Soft Fron t Panel.
Chapter 1 Introduction NI PCI-5911 User Manual 1-4 ni.com NI-SCOPE Function Reference Help , located at Start»Programs» National Instru ments»NI-SCO PE . For more detailed VI help, use LabVIEW context-sensiti v e help ( Help»Show Context Help ) or the NI-SCOPE VI Reference Help , located at Start»Programs»National Instruments»NI-SCOPE .
© National Instruments Corporat ion 2-1 NI PCI-5911 User Manual 2 Hardware Over view This chapter includes an overview of the NI 5 911, explains the operation of each functional unit making up the NI 5911, and describes the signal connections. Figure 2-1 shows a block diagram of the NI 5911.
Chapter 2 Hardware Overview NI PCI-5911 User Manual 2-2 ni.com presented at the negative input is subt racted from the signal presented at the positive input. As shown in Figure 2-2, this subtraction rem oves ground noise from the signal. The inner conductor of th e BNC is V+.
Chapter 2 Hardware Overview © National Instruments Corporat ion 2-3 NI PCI-5911 User Manual Input Ranges To optimize the ADC resolution, you can select different gains for the PGIA so that you can scale your input signal to match t he full input range of the converter.
Chapter 2 Hardware Overview NI PCI-5911 User Manual 2-4 ni.com where V m is the measured v oltage, V s is the source v oltage, R s is the e xternal source impedance, and R in is the input impedance. If the de vice you are measuring has a very lar ge output impedance, your measurements will be af fected by th is impedance divider .
Chapter 2 Hardware Overview © National Instruments Corporat ion 2-5 NI PCI-5911 User Manual to allo w an 8-bit digitizer to acquire accurate data. Howe v er , the NI 5911 in flexible resolution mode is much more precise and thus requires a greater number of time constants of settling ti me to achiev e the desired precision.
Chapter 2 Hardware Overview NI PCI-5911 User Manual 2-6 ni.com Flexible Resolution Mode Table 2-2 shows the relationship between the avail able sampling rates, resolution, and the corresponding bandwidt h for flexible resolution mode.
Chapter 2 Hardware Overview © National Instruments Corporat ion 2-7 NI PCI-5911 User Manual Calibration The NI 5911 can be calibrated for high accuracy and resolution because of an advanced calibration sch eme. Th ere are two different types of calibration: internal, or self-calibrati on, and external calibration.
Chapter 2 Hardware Overview NI PCI-5911 User Manual 2-8 ni.com • The linearity of the ADC is calibrated using an internal sine wav e generator as reference. • The time-to-digital con verter used for RIS measurements is calibrated. Caution Do not apply high-amplit ude or high-frequency signals to the NI 5911 during self-calibration.
Chapter 2 Hardware Overview © National Instruments Corporat ion 2-9 NI PCI-5911 User Manual Figure 2-3. T rigger Sources Analog T rigger Circuit The analog trigger on the NI 591 1 operates by comparing the current analog input to an onb oard threshold voltage.
Chapter 2 Hardware Overview NI PCI-5911 User Manual 2-10 ni.com T rigger Holdoff Trigger holdoff is the minimu m length of time (in seconds) from an accepted trigger to the start of the ne xt record. In other words, when a trigger is accepted, the trigger counter is loaded with the desired holdoff time.
Chapter 2 Hardware Overview © National Instruments Corporat ion 2-11 N I PCI-5911 User Manual Multi-Record Acquisitions After the trigger has been received a nd the posttrigger samples have been stored, the NI 5911 can be configured to begin another acquisition that is stored in another onboard memory record.
Chapter 2 Hardware Overview NI PCI-5911 User Manual 2-12 ni.com PFI Lines as Inputs You can select PFI 1 or PFI 2 as inputs for a trigger or a reference clock. Refer to the Synchr o niza t ion sec t ion f o r m ore informa t ion about t h e use of reference clocks in the NI 5911.
Chapter 2 Hardware Overview © National Instruments Corporat ion 2-13 N I PCI-5911 User Manual route that trigger over the R TSI bus to trigger the other digitizer(s). Howe v er , the trigger that is routed to the ot her digitizer(s) is sent synchronously to an internal 25 MHz clock.
© National Instruments Corporat ion A-1 NI PCI-5911 User Manual A Specifications This appendix lists the specifications of the NI 5911. These specif ications are typical at 25 ° C unless otherwise stated. Acquisition System Bandwidth ........ ......
Appendix A Specifications NI PCI-5911 User Manual A-2 ni.com Sample onboard memory ......... ............... 4 MB or 16 MB Memory Sample Depth 20 kS/s Fle xible Resolution 20.
Appendix A Specifications © National Instruments Corporat ion A-3 NI PCI-5911 User Manual Vertical Sensitivity (Input Ranges) Acquisition Characteristics Accuracy DC gain accuracy ......... .............. ............ ±0.05% si gnal ±0 .0001% fs for all input ranges at 1 MS/s in flexible resolution mode DC offset accuracy .
Appendix A Specifications NI PCI-5911 User Manual A-4 ni.com Filtering Dynamic Range Noise (excluding input-referred no ise) Sampling Fr equency Filter Mode Bandwidth Rip ple Alias Attenuation 100/ n * MS/s Con ventional 100 MHz ±3 dB N/A 12.5 MS/s Flexible Resolution 3.
Appendix A Specifications © National Instruments Corporat ion A-5 NI PCI-5911 User Manual Distortion T imebase System Reference clock .......................... ............ 10 MHz Clock accuracy (as master) .. .............. .... 10 MHz ±50 ppm Clock input tolerance (as slave) .
Appendix A Specifications NI PCI-5911 User Manual A-6 ni.com Clock jitter .............. .............. ................. .<75 pS rms , independent of reference cloc k source Clock compatibility ....................... .........TTL fo r both input and output Sampling clock frequencies Conventional mode .
Appendix A Specifications © National Instruments Corporat ion A-7 NI PCI-5911 User Manual Sampling Methods Random interleaved sampling ................ 1 GS/s down to 200 MS/s effective sample rate, repetit ive signals only Real-time sampling .......
Appendix A Specifications NI PCI-5911 User Manual A-8 ni.com Calibration Self-calibration (inter nal calibration) .....Self-calibrati on is done using a software command. The calibration involves g ain, offset and linearity correction for all input ranges and input modes.
Appendix A Specifications © National Instruments Corporat ion A-9 NI PCI-5911 User Manual CE Compliance This product meets the essential re quirements of applicable European Directi ves, as amended f.
© National Instruments Corporat ion B-1 NI PCI-5911 User Manual B T echnical Support and Professional Ser vices Visit the following sections of the National Instruments Web site at ni.
Appendix B T echnica l Support and Professional Services NI PCI-5911 User Manual B-2 ni.com If you searched ni.com and could not find the answers you need, contact your local off ice or NI corporate h eadquarters. Phone numbers for our worldwide of f ices are listed at the front of this manual.
© National Instruments Corporat ion G-1 NI PCI-5911 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 .
Glossary NI PCI-5911 User Manual G- 2 ni.com A C coupled the passing of a signal through a filter network that remov es the DC component of t he signal ADC analog-to-digital con ver ter—an electroni.
Glossary © National Instruments Corporat ion G-3 NI PCI-5911 User Manual clock hardware component that controls timing for reading from or writing to groups CMRR common-mode rejection ratio—a measu.
Glossary NI PCI-5911 User Manual G- 4 ni.com E EEPR OM electrically erasable programmabl e read-only memory—R OM that can be erased with an electrical signal and reprogrammed equiv alent time sampli.
Glossary © National Instruments Corporat ion G-5 NI PCI-5911 User Manual input impedance the measured resistance and capacitan ce between the input terminals of a circuit instrument driv er a set of high-lev el software functions t hat controls a specific plug-in D A Q board.
Glossary NI PCI-5911 User Manual G- 6 ni.com N noise an undesirable electri cal signal—noise comes from external sources such as the A C power line, motors, generators, transform ers, fluorescent li.
Glossary © National Instruments Corporat ion G-7 NI PCI-5911 User Manual pretriggering the technique used on a device to k eep a buf fer filled with data, so that when the trigger conditions are met , the sample includes the data leading up to the trigger condition PXI PCI eXtensions for Instrumentation.
Glossary NI PCI-5911 User Manual G- 8 ni.com sense in four -wire resistance the sense m easures the v oltage across the resistor being excited by the e xcitation current settling time the amount of ti.
Glossary © National Instruments Corporat ion G-9 NI PCI-5911 User Manual V Vv o l t s V AC volts alternating current VDC volts direct current V error voltage error VI virtual instrument—(1) a combi.
© National Instruments Corporat ion I-1 NI PCI-5911 User Manual Index A AC coupling, 2-4 accuracy characteristics, A-3 acquisition multiple record, 2-11 Scope Soft Front Panel, 1-4 acquisition charac.
Index NI PCI-5911 User Manual I-2 ni.com E errors during acquisition, 2-8 example code, B-1 F filtering specifications, A-4 flexible resolu tion mode available sampling rates (table), 2-6 definition, .
Index © National Instruments Corporat ion I-3 NI PCI-5911 User Manual Declaration of Conformity, B-1 professional services, B-1 system integration services, B-1 technical support, B-1 worldwide offic.
Index NI PCI-5911 User Manual I-4 ni.com specifications acquisition characteristics accuracy, A-3 common-mode characteristics, A-3 distortion, A-5 dynamic range, A-4 filtering, A-4 acquisition modes, .
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