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Computer-Based Instruments NI 5911 User Manual Digital Oscilloscope for PCI NI 5911 User Manual September 2000 Edition Part Number 322150 B-01.
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Important Information Warranty The NI 5911 is warranted against defects in m aterials and workmansh ip for a period of one year from the date of shipment, as evidenced by receipts or other doc umentation. National Instruments will, at its opti on, repair or replace equipment that p roves to be defective during the warranty p eriod.
Conventions The follo wing con ventions 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 Pa ge Setup item, and select Options from the last dialog box.
© National Instruments Corporatio n v 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 vi ni.com RTSI Bus Trigger and Clock Lines ........... ......................... .......................... ................. 2-14 PFI Lines ............ ......................... ......................... ...............
© National Instruments Corporatio n 1-1 NI 5911 User Manual 1 T aking Measurements with the NI 5911 Thank you for buying a National In struments 5911 digital osci lloscope with flexible reso lution. This chapter provides infor mation 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 Note The +5 V signal is fused at 1.1 A. Howe ver , National Instrument s recommends limiting the current from t his pin to 30 mA. The fuse is self-r esetting.
Chapter 1 T aking Measurements w ith the NI 5911 NI 5911 User Manual 1-4 ni.com Acquiring Data When you launch VirtualBench-Scope, it operates in continuous run mode. To start acquiring signals with VirtualBench-Scope, complete the following steps: 1.
Chapter 1 T ak ing Measuremen ts with the NI 5911 © National Instruments Corporatio n 1-5 NI 5911 User Manual Note When you launch V irtualBench-Scope, it automatically uses the setti ngs of your pre vio us V irtualBench-Scope session. 3. Enable the Ch 0 button in the channel selector area.
Chapter 1 T aking Measurements w ith the NI 5911 NI 5911 User Manual 1-6 ni.com The V irt ualBench-Scope soft front panel has the following features: • Channels selector — picks a channel or math functions tha t display wa veforms. • Channel settings g roup: – Channel settings selector selects the channel whose settings wil l be modified.
© National Instruments Corporatio n 2-1 NI 5911 User Manual 2 Hardware Overview This chapter includes an overview of t he NI 5911, explains the operatio n 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 NI 5911 PGIA is a differential amplifier.
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 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 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 other 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 Internally Calibrating the NI 5911 Internally calibrate your N I 5911 with a software function or a LabVIEW VI. Read more ab out the function, ni S cope_Cal S elfCali b rate , i n y our N I -SCOPE Function R efe r ence Help file.
Chapter 2 Hardware Over view NI 5911 User Manual 2-8 ni.com of range and should be recalibrated by performing an internal calibration. During acquisition in flexible resolution m ode, an error will be generated if the input to the ADC goes out of range for the converter.
Chapter 2 Hardware Over view © National Instruments Corporatio n 2-9 NI 5911 User Manual Figure 2-3. T rigger Sources Analog T rigger Circuit The analog trigger on the NI 5911 operates by c omparing the current analog input t o an onboard threshol d voltage.
Chapter 2 Hardware Over view NI 5911 User Manu al 2-1 0 ni.com Figure 2-4. Below-Level Analog T riggering Mode In below-le vel analog triggering mode, the trigger is generated when t he signal value is less than the trigger value.
Chapter 2 Hardware Over view © National Instruments Corporation 2-11 NI 5 911 User Manual Figure 2-6. High-Hysteresis Analog T riggering Mode In high-hysteresis analog trigg ering mode, the trigger is generated w hen a signal crosses abov e the h ysteresis value and then crosses abo ve the trigger v alue.
Chapter 2 Hardware Over view NI 5911 User Manu al 2-1 2 ni.com T rigger Hold-Off The trigger hold-off is a length of time that the NI 5911 waits after a trigg er is accepted before it accepts another trigger. In other words, when a trigger is received during acquisition, the trigger counter is loaded with the desired hold-off time.
Chapter 2 Hardware Over view © National Instruments Corporation 2-13 NI 5 911 User Manual Memor y The NI 5911 stores samples in onboard memo ry before transferring the samples to the host com puter. The minim um size for a buffer in the onboard memory is approximately 4,000 8-bit oscilloscope mode s amples or 1,000 32-bit decimation mode sam ples.
Chapter 2 Hardware Over view NI 5911 User Manu al 2-1 4 ni.com Figure 2-9. Multiple Buffer Acquisition R TSI Bus T rigger and Clock Lines The RTSI bus allows National Instruments b oards to synchronize ti ming and triggering on multiple devices. The RTSI bus has seven bidirectional trigger lines and one bidirecti onal clock signal.
Chapter 2 Hardware Over view © National Instruments Corporation 2-15 NI 5 911 User Manual PFI Lines as Outputs You can select PFI1 or PFI2 to output seve ral digital signals. Reference Clock is a 10 MHz clock that is synchronous to the 100 MH z sample clock on 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 specif ied. Acquisition System Bandwidth ..............
Appendix A Specifications NI 5911 User Manual A-2 ni.com Memory record sizes ............... ...............2,000 samples, to maximum sample depth determined by sample frequency Vertical sensitivity (input ranges) Acquisition Characteristics Accuracy Amplitude accuracy .
Appendix A Specifications © National Instruments Corporatio n A- 3 NI 5911 User Manual Max measurable input voltage ........... .... ±10 V (DC + peak AC) Input protection .................... .................. ±42 VDC (DC + peak AC) Input bias current .
Appendix A Specifications NI 5911 User Manual A-4 ni.com Dynamic Range Noise (excluding input-referred noise) Distortion Sampling Frequency Band width Noise Density To t a l N o i s e 100 MHz/ n 100 MHz – 120 dBfs/ – 43 dBfs 12.5 MHz 3.75 MHz – 135 dBfs/ – 64 dBfs 5M H z 2M H z – 150 dBfs/ – 83 dBfs 2.
Appendix A Specifications © National Instruments Corporatio n A- 5 NI 5911 User Manual T imebase System Number of timebases ........ ..................... 2, RTSI clock configured as a 10 MHz clock output (Master), or RTSI clock configured as a 10 MHz reference clock input (Slave).
Appendix A Specifications NI 5911 User Manual A-6 ni.com T riggering Systems Modes .......... ......................... ..................Above threshold, below threshold, between th resholds, outside thresholds Source .................. .............
Appendix A Specifications © National Instruments Corporatio n A- 7 NI 5911 User Manual Acquisition Modes RIS ........ .......................... ....................... 1 GS/s down to 200 MS/s effective sample rate, repetitive signals only. Data is interleaved in software.
Appendix A Specifications NI 5911 User Manual A-8 ni.com Calibration Internal .................................................... Internal calibrati on is done upon software command. The calibration involves g ain, offset and linearity correction for all input ranges and input modes.
© National Instruments Corporatio n B- 1 NI 5911 User Manual B Digitizer Basics This appendix explains basic information you need to understand abou t making measurements with dig itizers, including importan t terminology .
Appendix B Digitizer B asics NI 5911 User Manual B-2 ni.com Analog Bandwidth Analog bandwidth describes the frequenc y range (in Hertz) in which a signal can be digitized accurately . This limitation is determined b y the inherent frequency response of the input path which causes loss of amplitude and phase in formation.
Appendix B Digitizer Basics © National Instruments Corporatio n B- 3 NI 5911 User Manual Figure B-3. 1M H zS i n eW a v eS a m p l e V ertical Sensitivity Vertical sensitivity d escribes the smallest input voltage change the digitizer can capture. This limitation is because one distinct digital voltage encompasses a range of analog voltages.
Appendix B Digitizer B asics NI 5911 User Manual B-4 ni.com Figure B-4. T ransfer Function of a 3-Bit ADC ADC Resolution ADC resolution limits the accuracy of a measurement. The higher the resolution (number of bits), the more accurate the measurement.
Appendix B Digitizer Basics © National Instruments Corporatio n B- 5 NI 5911 User Manual thresholds, programmable hysteresis values, and trigger hold-off. The NI 5911 also has two digital triggers that give you more fle x ibility in triggering by allo wing you t o connect a TTL/CMOS digital signal to trigger the acquisition.
Appendix B Digitizer B asics NI 5911 User Manual B-6 ni.com Figure B-5. Waveform Reconstruction w i th RIS The time measurement is made w ith a time-to-digital con verter (TDC). The resolution of the TD C is the number of physical bins to which t he TDC can quantize the trigger arriv al time.
Appendix B Digitizer Basics © National Instruments Corporatio n B- 7 NI 5911 User Manual For e xample, consider the maximum interpolation factor to be 5. If the TDC could output v alues from 0 to 15, then each logical bin will contain three physical bi ns, as show n in Figure B-6.
Appendix B Digitizer B asics NI 5911 User Manual B-8 ni.com Figure B-7. Dynamic Range of an 8-Bit ADC with Three Different Gain Settings +127 LSB +38.4 LSB – 38.4 LSB 0 LSB – 128 LSB +127 LSB +7 LSB – 8 LSB 0 LSB – 128 LSB +127 LSB +153 LSB – 154 LSB 0 LSB – 128 LSB Acquired Signal a.
Appendix B Digitizer Basics © National Instruments Corporatio n B- 9 NI 5911 User Manual • Source impedance — Mo st digitizers and d igital storage os cilloscopes ( D S O s )h a v ea1M Ω input resistance in the passb and.
Appendix B Digitizer B asics NI 5911 User Manu al B-10 ni.com Figure B-8. Difficul t Pulse T rain Signal Ideally , the t rigger ev ent should occu r at condition one, but sometimes the instrument may trigger on co ndition two because the signal crosses the trigger lev el.
© National Instruments Corporatio n C- 1 NI 5911 User Manual C 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 C T echnical Support R esources NI 5911 User Manual C-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 off ice W eb sites from the W o rldwide Of fices section of ni.
© National Instruments Corporatio n G-1 NI 5911 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 G.
Glossary NI 5911 User Manual G-2 ni.com A C coupled the passing of a signal through a f i lter network that removes the DC component of the si gnal ADC analog-to-digital con verter — an electronic d.
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 cond itioning that allows you to f ilt er unwanted signals from the signal you are trying to measure G gain the factor by which a s.
Glossary © National Instruments Corporatio n G-5 NI 5911 User Manual interrupt lev el the relativ e priority at wh ich a device can interrupt ISA industry standard architecture K kk i l o — the sta.
Glossary NI 5911 User Manual G-6 ni.com N noise an undesirable electrical sign al — Noise comes from external 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 filled 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 xcitation cur rent 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 o ltage error VI virtual instrument — (1) a combinat.
© National Instruments Corporatio n I-1 NI 5911 User Manual Index Numbers +5 V signal limitation on current (note), 1-3 self-resetting fuse (note), 1-3 A AC coupling, 2-4 accuracy characteristics, A-2 to A-3 accurate measurements for digitizers. See digitizers.
Index NI 5911 User Manual I-2 ni.com noise-free signal measurement (figure), 2-2 d i g i t i z e r s ,B - 1t oB - 1 0 ADC resolution, B-4 analog bandwidth, B-2 making accurate measurements, B - 7t oB .
Index © National Instruments Corporatio n I-3 NI 5911 User Manual I impedance formula for impedance divider, 2-3 input and output impedance, 2 -3 source impedance, B-9 input bias, 2-4 input coupling,.
Index NI 5911 User Manual I-4 ni.com power requirement specifications, A-7 programmatically controllin g NI 5911, 1-3 pulse train sign al, difficult (f igure), B-10 R Random Interleaved Sampling (RIS).
Index © National Instruments Corporatio n I-5 NI 5911 User Manual V vertical sensitivity d i g i t i z e r s ,B - 3t oB - 4 specifications, A-2 VirtualBench-Scope soft fron t panel, 1-2 to 1-6 Acquir.
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