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Computer-Based Instruments NI 5911 User Manual High-Speed Digitizer with FLEX ADC NI 5911 User Manual ™ June 2001 Edition Part Number 322150D-01.
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Important Information Warranty The NI 5911 is warranted ag ainst defects i n materials an d workmanshi p for a peri od of one yea r from the da te of shipment , as eviden ced by receipts or other documenta tion. National Instruments will, at it s option, repair or replace equipment that proves to be defective during the warranty period.
Compliance FCC/Canada Radio Frequency Interference Compliance* Determining FCC Class The Federal Communications Commission (FCC) has rules to protect wireless communications from interference.
Canadian Depart ment of Communications This Class B digital apparatus meets all requirements of the Canadian I nterference-Causing Equipment Regulations. Cet appareil num é rique de la classe B respecte toutes les exigences du R è gleme nt sur le mat é riel brouilleur du Canada.
Conventions The follo wing con v entions are used in this manual: » The » symbol leads you through nested menu items and dialog box options to a final action. The sequence File»Page Setup» Options directs you to pull down the File menu, selec t the Page Setup item, and select Options from the last dialog box.
© National Instruments Corporatio n vii NI 5911 User Manual Contents Chapter 1 Taking Measurements with the NI 5911 Installing the NI 5911 ........... .............. ......................... ............... ......................... .......... 1-1 Connecting Signals .
Contents NI 5911 User Manu al viii ni.com RTSI Bus and Clock PFI .... .............. .......................... ........... .............. .......................... 2-11 PFI Lines ............ .............. ......................... ................
© National Instruments Corporatio n 1-1 NI 5911 User Manual 1 T aking Measurements with the NI 5911 Thank you for buyin g a National Instruments (NI) 5911 digitizer, featuring the FLEX AD C. This chapter provid es informatio n on installing, connecting signals to, a nd acquiring data from your N I 5911.
Chapter 1 T aking Measurements w ith the NI 5911 NI 5911 User Manual 1-2 ni.com Figure 1-1. NI 5911 Connectors Figure 1-2. 9-Pin Mini Cir cular DIN Connector 1 +5 Volts (Fused) 2G N D 3 Reserved 4R e .
Chapter 1 T ak ing Measuremen ts with the NI 5911 © National Instruments Corporatio n 1-3 NI 5911 User Manual Acquiring Data with Y our NI 5911 You can acquire data either programmatically — by writing an app lication f o ry o u rN I5 9 1 1 — or interactively with the Scope Soft Front Panel.
© National Instruments Corporatio n 2-1 NI 5911 User Manual 2 Hardware Overview This chapter includes an overview of the NI 5 911, explains the operation of each functional unit making up your NI 5911, and describes the signal connections. Figure 2-1 shows a block diagram of the NI 5911.
Chapter 2 Hardware Over view NI 5911 User Manual 2-2 ni.com Differential Input When measuring high dynamic range signals, ground n oise is often a problem. The PGIA of the NI 5911 allows you to make no ise-free signal measurements. The PGIA differential amplifier efficiently rejects any noise present on the ground sign al.
Chapter 2 Hardware Over view © National Instruments Corporatio n 2-3 NI 5911 User Manual Input Ranges To optimize the ADC resolution, you can select different gains for the PGIA. In this way, you can scale y our input signal to match the full inpu t range of the converter.
Chapter 2 Hardware Over view NI 5911 User Manual 2-4 ni.com if the de vice has 1 M Ω output impedance, your measured signal will be one-half the actual signal value. Input Bias The inputs of the PGIA typically draw an inpu t bias current of 1 nA at 25 ° C.
Chapter 2 Hardware Over view © National Instruments Corporatio n 2-5 NI 5911 User Manual analysis, distortion analysis, and other measurements for which high resolution is crucial. Oscilloscope Mode The ADC converts at a constant rate of 10 0 MS/s, but you can choose to store only a fraction of these samples into m emory at a lower rate.
Chapter 2 Hardware Over view NI 5911 User Manual 2-6 ni.com Like an y o ther type of con verter that uses noise shaping to enhance resolution, the frequency response of the con verter is only flat to its maximum useful bandwidth. The NI 5911 h as a bandwidth of 4 MHz.
Chapter 2 Hardware Over view © National Instruments Corporatio n 2-7 NI 5911 User Manual Calibration The NI 5911 can be calibrated for very high accuracy and resolution due to an advanced calibration scheme. There are two different types of calibration: internal, or self, calibration and external calibration.
Chapter 2 Hardware Over view NI 5911 User Manual 2-8 ni.com • The linearity of the ADC is calibrat ed using an internal sinewa ve 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 internal calibration.
Chapter 2 Hardware Over view © National Instruments Corporatio n 2-9 NI 5911 User Manual Figure 2-3. T rigger Sour ces Analog T rigger Circuit The analog trigger on the NI 5911 operates by c omparing the current analog input to an onb oard threshold voltage.
Chapter 2 Hardware Over view NI 5911 User Manu al 2-1 0 ni.com T rigger Hold-Off Trigger hold-off is the minimum length of time (in seconds) from an accepted trigger to the start of the next record. In other words, when a trigger is accepted, the trigger counter is loaded with the desired hold-off time.
Chapter 2 Hardware Over view © National Instruments Corporation 2-11 NI 5 911 User Manual Multiple-Record Acquisitions After the trigger has been received and the posttrigger samples have been stored, the NI 5911 can be configured to begin another acqui sition that is stored in another onboard memory record.
Chapter 2 Hardware Over view NI 5911 User Manu al 2-1 2 ni.com PFI Lines as Inputs You can select PFI1 or PFI2 as inputs for a trigger o r a reference clock. Please see the Synchronization section belo w for more information about the use of reference clocks in the NI 5911.
© National Instruments Corporatio n A- 1 NI 5911 User Manual A Specifications This appendix lists the sp ecifications of the NI 5911. These specifications are typical at 25 ° C unless otherwise stated. Acquisition System Bandwidth .............. ...
Appendix A Specifications NI 5911 User Manual A-2 ni.com Sample onboard memory ........................ 4 MB or 16 MB Memory sample depth Vertical sensitivity (input ranges) 20 kS/s Flexible Resolution 20.
Appendix A Specifications © National Instruments Corporatio n A- 3 NI 5911 User Manual Acquisition Characteristics Accuracy DC gain accuracy ................................... ±0.05% signal ±0.0001% fs for all input ranges at 1 MS/ s in flexible resolu tion mode DC offset accuracy .
Appendix A Specifications NI 5911 User Manual A-4 ni.com Filtering Dynamic Range Noise (excluding input-referred noise) Sampling Frequency Filter Mode Bandwidth Ripple Alias Attenuation 100/ n * MS/s Oscilloscope 100 MHz ±3 dB N/A 12.5 MS/s Flex ible Resolution 3.
Appendix A Specifications © National Instruments Corporatio n A- 5 NI 5911 User Manual Distortion T imebase System Reference clock ...................
Appendix A Specifications NI 5911 User Manual A-6 ni.com Clock input tolerance (as slave)..............10 MHz ±100 ppm Clock jitter ........... ............... ....................<75 pS rms, independent of reference clock so urce Clock compatibility .
Appendix A Specifications © National Instruments Corporatio n A- 7 NI 5911 User Manual Sensitivity ............................................... 170 steps in full-scale voltage range TRIG input range ......... .............. ............ ±5 V (without external attenuation) TRIG input impedance .
Appendix A Specifications NI 5911 User Manual A-8 ni.com Operating Environment Note Multiple NI 5911s in the same co mputer may raise operating temperat ures beyond specification and gi ve rise to imprecise data. NI strong ly recommends leaving an empty PCI slot between multi ple NI 5911s or adding a fan.
© National Instruments Corporatio n B- 1 NI 5911 User Manual B T echnical Support Resources W eb Support National Instruments W eb support is your first stop for help in solving installation, configuration, and application pro blems and questions.
Appendix B T echnical Support R esources NI 5911 User Manual B-2 ni.com W orldwide Support National Instruments has of fices located around the world to help address your support needs. Y ou can access our branch of fice W eb sites from the W orldwide Of fices section of ni.
© National Instruments Corporatio n G-1 NI 59 11 User Manual Glossar y Pref ix Meanings V alue p- pico- 10 – 12 n- nano- 10 – 9 µ- micro- 10 – 6 m- milli- 10 – 3 k- kilo- 10 3 M- mega- 10 6 .
Glossary NI 5911 User Manual G-2 ni.com A C coupled the passing of a signal through a filter network that removes the DC component of the si gnal ADC analog-to-digital con verter — an electronic de .
Glossary © National Instruments Corporatio n G-3 NI 5911 User Manual clock hardware component that controls timing for reading from or writing to groups CMRR common-mode rejection ratio — a measure.
Glossary NI 5911 User Manual G-4 ni.com F filtering a type of signal conditioning that al lo w s you to filter unwanted signals from the signal you are trying to measure fs full-scale — total voltage in the input range.
Glossary © National Instruments Corporatio n G-5 NI 5911 User Manual interrupt lev e l the relativ e prior ity at which a device can interrupt ISA industry standard architecture K kk i l o — the st.
Glossary NI 5911 User Manual G-6 ni.com N noise an undesirable electrical signal — noise comes from e xternal sources such as the A C power line, motors, generators, transformers, fluoresc ent light.
Glossary © National Instruments Corporatio n G-7 NI 5911 User Manual pretriggering the technique used on a de vice to keep a b uffer f illed with data, so that when the trigger conditions are met, the sample includes the data leading u p to the trigger con dition PXI PCI eXtensions for Instrumentation.
Glossary NI 5911 User Manual G-8 ni.com sense in four-wire resistance the sense measures the v oltag e across the resistor being excited by the e xcitati on current settling time the amount of time re.
Glossary © National Instruments Corporatio n G-9 NI 5911 User Manual V V volts V AC volts alternating current VDC volts direct current V error v oltage error VI virtual instrument — (1) a combinati.
© National Instruments Corporatio n I-1 NI 5911 User Manual Index A AC coupling, 2-4 accuracy characteristics, A-3 acquisition multiple record, 2-11 Scope Soft Front Panel, 1-3 acquisition characteri.
Index NI 5911 User Manual I-2 ni.com G grounding considerations, 2-2 H hardware overview See also specifications acquisition syste m PFI lines, 2-11 triggering and arming , 2-8 block diagram of NI 591.
Index © National Instruments Corporatio n I-3 NI 5911 User Manual O operating environment specifications, A-8 oscilloscope mode definition, 2-4 purpose and use, 2-5 Real-Time and RIS sampling methods, 2-5 output impedance, 2-3 P PFI lines as inputs, 2-12 as outputs, 2-12 overview, 2-11 PGIA.
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