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National Instruments NI cDAQ-9172 - page 1
USER GUIDE AND SPECIFICATIONS NI cDAQ-9172 Contents Introduction ............ .............. .............. .............. ............... .............. .......... 4 Safety Guidelines .............. .............. ............... .............. .............. ............. 5 Safety Guidelines for Hazardous Vo ltages ........ ...................... ...
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National Instruments NI cDAQ-9172 - page 2
NI cDAQ-9172 User Guide and Specifications 2 ni.com Analog Input .................... .............. .............. .............. .............. .............. ..20 Analog Input Triggering ............ ................. .............. .............. ..........20 AI Start Trigger Signal ........................ .............. ................. .... ...
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National Instruments NI cDAQ-9172 - page 3
© National Instruments Corporation 3 NI cDAQ-9172 User Guide and Specifications Counter Timi ng Signals ... .............. .............. .............. .............. ........ 63 Counter n Source Signal ............ .............. .............. .............. ..... 64 Counter n Gate Signal................... .............. .............. ....... ...
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National Instruments NI cDAQ-9172 - page 4
NI cDAQ-9172 User Guide and Specifications 4 ni.com Introduction This user guide describes how to use the National Instruments cDAQ-9172 chassis and lists specificat ions. For an interactive demonstration of how to install the NI cDAQ-9172, go to ni.com/info and enter daqin s tall . The NI cD A Q-9172 is an eight-sl ot USB chassis designed for use ...
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National Instruments NI cDAQ-9172 - page 5
© National Instruments Corporation 5 NI cDAQ-9172 User Guide and Specifications Safety Guidelines Operate the NI cDAQ-9172 chassis only as described in this user guide. Note Because some C Series I/O modules may ha v e more stringent certif ication standards than the NI cD A Q-9172 chassi s, the combined system may be limited by individual compone ...
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National Instruments NI cDAQ-9172 - page 6
NI cDAQ-9172 User Guide and Specifications 6 ni.com Related Documentation Each application software package an d driver includes information about writing applications for taking measur ements and controlling measurement devices. Check ni.com/manual s for the most recent hardware documentation, and refer to Table 1 for a list of locations for drive ...
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National Instruments NI cDAQ-9172 - page 7
© National Instruments Corporation 7 NI cDAQ-9172 User Guide and Specifications LabVIEW Getting Started with LabVIEW —describes the LabVIEW graphical programming environment and the basic LabVIEW features you use to build data acquisition and instrument control application. Start»All Programs» National Instruments» LabVIEW»LabVIEW Manuals or ...
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National Instruments NI cDAQ-9172 - page 8
NI cDAQ-9172 User Guide and Specifications 8 ni.com LabW indo ws ™ /CVI ™ LabWindows/CVI Help Data Acquisition book—contains NI-D A Qmx measurement concepts and step-by-step instructions about creating a measurement task using the D A Q Assistant. Help»Contents , then select Usin g LabWindows/CV I» Data Acquisition» Taking an NI-DAQmx Meas ...
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National Instruments NI cDAQ-9172 - page 9
© National Instruments Corporation 9 NI cDAQ-9172 User Guide and Specifications Device Documentation and Specifications Check ni.com/manual s for the most recent device and software documentation. If you do not have W eb access, NI-DAQmx includes a Documentation CD that includes documentation available when NI-DAQmx released. T raining Courses If ...
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National Instruments NI cDAQ-9172 - page 10
NI cDAQ-9172 User Guide and Specifications 10 ni.com Installing the Software Installing NI-DAQmx The DAQ Getting Started Guide , which you can down load at ni.com/ manual s , offers NI-DAQmx users step-by-st ep instructions for installing software and hardware, configu ring channels and tasks, and getting started developing an application. Installi ...
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National Instruments NI cDAQ-9172 - page 11
© National Instruments Corporation 11 NI cDAQ-9172 User Guide and Specifications Installing the NI cDAQ-9172 Figure 2 shows the dimensions of the NI cD AQ-9172 chassis. Figure 2. NI cDAQ-9172 with Dimensions in Millimeters (Inches) 53.8 mm (2.12 in.) 46.0 mm (1.81 in.) 23.7 mm (0.94 in.) 20.3 mm (0.80 in.) 25.0 mm (0.98 in.) 44.1 mm (1.74 in.) 24. ...
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National Instruments NI cDAQ-9172 - page 12
NI cDAQ-9172 User Guide and Specifications 12 ni.com Mounting the NI cDAQ-9172 You can mount the NI cDAQ-9172 chassis usin g a desktop, a 35 mm DIN-Rail, or a panel mount accesso ry kit. For accessory ordering information, refer to ni.com . Caution Y our installation must meet the following requirements: • Allows 25.4 mm (1 in.) of clearance abov ...
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National Instruments NI cDAQ-9172 - page 13
© National Instruments Corporation 13 NI cDAQ-9172 User Guide and Specifications NI 9910 DIN-Rail Kit The NI 9910 DIN-Rail Kit contains on e clip for mounting the chassis on a standard 35 mm DIN-Rail . To mount t h e chassis on a DIN-Rail, fasten the DIN-Rail clip to the chassis using a num ber 2 Phillips screwdriver and two M4 × 17 screws. The s ...
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National Instruments NI cDAQ-9172 - page 14
NI cDAQ-9172 User Guide and Specifications 14 ni.com can be used with M4, M5, No. 8, or No.10 panhead screws. Figure 5 illustrates the panel dimensions and instal lation on th e NI cDAQ-9172 chassis. Refer to the documentation included with the NI 9905 Panel Mount Kit for more detailed dimensions. Figure 5. Panel Mount Dimensions and In stallation ...
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National Instruments NI cDAQ-9172 - page 15
© National Instruments Corporation 15 NI cDAQ-9172 User Guide and Specifications Setting Up the NI cDAQ-9172 Complete the following steps to prep are the NI cDAQ-9172 chassis for use: 1. Before connecting the hardware, in stall the NI-D A Qmx software. Refer to the DAQ Getting Started Guide for more informat ion about software installation. Note T ...
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National Instruments NI cDAQ-9172 - page 16
NI cDAQ-9172 User Guide and Specifications 16 ni.com 6. Squeeze both C Series I/O module latc hes, insert the I/O module into the module slot, and pr ess until both latches lock the module in place. 7. Connect the NI cDAQ-9172 chassis with the supplied USB cable to any a v ailable USB port on your computer . 8. Connect the power source to the NI cD ...
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National Instruments NI cDAQ-9172 - page 17
© National Instruments Corporation 17 NI cDAQ-9172 User Guide and Specifications 13. Check that your device appears under Devices and Interfaces . If your device does not appear , press <F5> to refresh the view in MAX. If your device is still not recognized, refer to ni.com/ s upport/in s tall for troubleshooting info rmation. 14. Right-clic ...
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National Instruments NI cDAQ-9172 - page 18
NI cDAQ-9172 User Guide and Specifications 18 ni.com Using the NI cDAQ-9172 The cDAQ system consists of three pa rts: C Series I/O modules, the cDAQ module interface, and the USB-STC2. These componen ts digitize signals, perform D/A conversions to generate analog output signals, measure and control digital I/O signal s, and provide signal condition ...
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National Instruments NI cDAQ-9172 - page 19
© National Instruments Corporation 19 NI cDAQ-9172 User Guide and Specifications T o access this KnowledgeBase, go to ni.com/info and enter the info code rdcdaq . Correlated vs. Static DIO Modules Digital I/O module capabilities are deter mined by the type of digital signals that the module is capable of measuring or generating . Static digital I/ ...
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National Instruments NI cDAQ-9172 - page 20
NI cDAQ-9172 User Guide and Specifications 20 ni.com PFI Signals The PFI signals, available through co rrelated digital input and output modules installed in slots 5 and/or 6, provide access to advanced features such as triggering, synchronization, and counter/timers. Refer to the PFI section for mor e information. The PFI pins hav e a digital filt ...
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National Instruments NI cDAQ-9172 - page 21
© National Instruments Corporation 21 NI cDAQ-9172 User Guide and Specifications triggers can come from three separate modules i f desired. T o find your module triggering option s, refer to the documentation included with your C Series I/O modules. For more information about using digital mod ules for triggering, re fer to the Digital I/O section ...
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National Instruments NI cDAQ-9172 - page 22
NI cDAQ-9172 User Guide and Specifications 22 ni.com Using an Analog Source Some C Series I/O modules can genera te a trigger base d on an analog signal. In NI-DAQmx, this is ca lled the Analog Comparison Event. When you use an analog tr igger source for ai/Start Trigger, the acquisition begins on the first rising edge of the Analog Com parison Eve ...
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National Instruments NI cDAQ-9172 - page 23
© National Instruments Corporation 23 NI cDAQ-9172 User Guide and Specifications When the reference trigger o ccurs, the NI cDA Q-9172 co ntinues to write samples to the buf fer unt il the buf fer contains the number of posttrigger samples desired. Figure 9 sho ws the final b uf fer . Figure 9. Reference T rigger Final Buffer Using a Digital Sourc ...
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National Instruments NI cDAQ-9172 - page 24
NI cDAQ-9172 User Guide and Specifications 24 ni.com AI Pause T rigger Signal You can use the AI Pause Trigger (a i/PauseTrigger) signal to pause and resume a measurement acquisition. Th e internal sample clock pauses while the external trig ger signal is active and resu mes when the signal is inact ive. You can program the active level of th e pau ...
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National Instruments NI cDAQ-9172 - page 25
© National Instruments Corporation 25 NI cDAQ-9172 User Guide and Specifications Figure 10. Sample Clock T iming Options Routing AI Sample Clock to an Output T erminal You can route ai/SampleClock to any output PFI terminal. AI Sample Clock T imebase The AI Sample Clock Timebase (ai/SampleClockTimebase) signal is divided dow n to provide a source ...
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National Instruments NI cDAQ-9172 - page 26
NI cDAQ-9172 User Guide and Specifications 26 ni.com ActiveDevs and AI Convert Clock Rate properties using the DAQmx Timing property node or functions. Simultaneous Sample-and-Hold Simultaneous sampl e-and-hold (SSH) C Series analog input modules contain multiple A/D converters or ci rcuitry that allows all the input channels to be sampl ed at the ...
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National Instruments NI cDAQ-9172 - page 27
© National Instruments Corporation 27 NI cDAQ-9172 User Guide and Specifications Slow Sample Rate Modules Some C Series analog input mod ules are specifically designed for measuring signals that vary slowly, su ch as temperature. Because of their slow rate, it is not appropriate for these modules to con strain the AI Sample Clock to operate at or ...
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National Instruments NI cDAQ-9172 - page 28
NI cDAQ-9172 User Guide and Specifications 28 ni.com Getting Started with AI Ap plications in Software You can use the NI c DAQ-9172 chassi s in the following analog inp ut applications: • Single-Point •F i n i t e • Continuous For more information about programming analog inp ut applications and triggers in software, Refer to the N I-DAQmx H ...
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National Instruments NI cDAQ-9172 - page 29
© National Instruments Corporation 29 NI cDAQ-9172 User Guide and Specifications Software-T imed Generations With a softw are-timed generation , softwa re controls the rate at which data is generated. Software sends a separate command to the hardware to initiate each DAC conversion. In NI-DAQmx, software-timed generations are referred to as on-dem ...
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National Instruments NI cDAQ-9172 - page 30
NI cDAQ-9172 User Guide and Specifications 30 ni.com One property of buf fered I/O operat ions is sample mode. The sample mode can be either finite or continuous: • Finite—Finite sample mode generati on refers to the generation of a specific, predetermined number of da ta samples. After the specified number of samples is written out, the genera ...
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National Instruments NI cDAQ-9172 - page 31
© National Instruments Corporation 31 NI cDAQ-9172 User Guide and Specifications Analog Output Timing Signals The NI cDAQ-9172 chassis featur es the following AO (waveform generation) timing signals: • A O Sample Clock •A O S t a r t T r i g g e r • A O Pause T rigger AO Sample Clock The AO sample clock (ao/ SampleClock) signals when all the ...
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National Instruments NI cDAQ-9172 - page 32
NI cDAQ-9172 User Guide and Specifications 32 ni.com more information, refer to th e NI-DAQmx Help . The NI-DAQmx Help is available after installation fro m Start»All Programs»Na tional Instruments»NI- DAQ»NI-DAQmx Help . Using a Digital Source To use ao/StartTrigger, specify a s ource and a rising or falling edge. The source can be one of the ...
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National Instruments NI cDAQ-9172 - page 33
© National Instruments Corporation 33 NI cDAQ-9172 User Guide and Specifications AO Pause T rigger Signal Use the AO Pause trigge r signal (ao/PauseTrigger) to mask off samples in a DAQ sequence. When ao/PauseTrigge r is active, no samples occur, but ao/PauseTrigger does not stop a sample that is in progress. The pause does not take effect until t ...
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National Instruments NI cDAQ-9172 - page 34
NI cDAQ-9172 User Guide and Specifications 34 ni.com The NI-DAQmx Help is av ailab le after installation from Start» All Programs»National Instruments»NI-DAQ»N I-DAQmx Help . To v i e w t h e LabVIEW Help, in v e rsion 8.0 or later , select Help»Search the LabVIEW Help in LabVIEW . Alternately , to do wnload the LabVIEW Help, go to ni.com/manu ...
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National Instruments NI cDAQ-9172 - page 35
© National Instruments Corporation 35 NI cDAQ-9172 User Guide and Specifications Digital I/O To use digital I/O, insert a digital I/O C Series m odule into any slot on the NI cDAQ-9172 chassis. The I/ O speci fications, such as number of lines, logic levels, update rate, and line direction, are determined by the ty pe of C Series I/O module used. ...
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National Instruments NI cDAQ-9172 - page 36
NI cDAQ-9172 User Guide and Specifications 36 ni.com Static DIO Each of the DIO lines can be used as a static DI or DO line. You can use static DIO lines to monitor or cont rol digital signals on some C Series I/O modules. Each D IO line can b e individually confi gured as a digital input (DI) or digital ou tput (DO), dependi ng on th e C Series I/ ...
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National Instruments NI cDAQ-9172 - page 37
© National Instruments Corporation 37 NI cDAQ-9172 User Guide and Specifications Using an Internal Source To use di/SampleClock w ith an internal source, specify the signal source and the polarity of the signal. Use the following signals as the source: • AI Sample Clock • AI Con vert Clock • A O Sample Clock • Counter n Internal Output • ...
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National Instruments NI cDAQ-9172 - page 38
NI cDAQ-9172 User Guide and Specifications 38 ni.com Buffered Digital Waveform Generation A buffer is a temporary storage in computer memory for generated samples. In a buffered generation, data is moved from a host buffer to the NI cDAQ-9172 onboard FIFO before it is written to the C Series I/O modules. Buffered generation s typically allow for mu ...
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National Instruments NI cDAQ-9172 - page 39
© National Instruments Corporation 39 NI cDAQ-9172 User Guide and Specifications Change Detection Event The Change Detection Event is the signal generated when a change on t he rising or falling edge lines is detected by the change detection task. Routing Change Detectio n Event to an Output Te r m i n a l You can route ChangeDet ectionEvent to an ...
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National Instruments NI cDAQ-9172 - page 40
NI cDAQ-9172 User Guide and Specifications 40 ni.com PFI You can configure channels of a correl ated digita l module in slots 5 and 6 as Programmable Function Interface (PFI) terminals. Y ou can configure each PFI indi vidually as the following: • Static digital input • Static digital output • T iming input signal for AI, A O, DI, DO, or coun ...
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National Instruments NI cDAQ-9172 - page 41
© National Instruments Corporation 41 NI cDAQ-9172 User Guide and Specifications Figure 15. NI cDAQ-9172 Counters Counters have se ven input sig nals, although in most applicat ions only a few inputs are used. For information about connecting the counter signals, refer to the Default Counter/Timer Routing section. The following sections describe v ...
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National Instruments NI cDAQ-9172 - page 42
NI cDAQ-9172 User Guide and Specifications 42 ni.com Counter Input Applications Counting Edges In edge counting appl ications, the co unter counts edges on its Source after the counter is armed. You can configure the counter to count rising or falling edges on its Source input. You also can control the direction of counting (up or down). The counte ...
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National Instruments NI cDAQ-9172 - page 43
© National Instruments Corporation 43 NI cDAQ-9172 User Guide and Specifications Y ou can route the pause tr igger to the Gate input of the cou nter . Y ou can configure the counter to pause cou nting when the pause t rigger is high or when it is lo w . Figure 17 shows an e xample of on-demand edge counting with a pause trigger . Figure 17. Single ...
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National Instruments NI cDAQ-9172 - page 44
NI cDAQ-9172 User Guide and Specifications 44 ni.com Controlling the Direction of Counting In edge counting applications, the counter can co unt up or down. You can configure the counter to do the follo wing: • Always count up • Always count do wn • Count up when the Counter n B input is hig h; count down when it is low For information on con ...
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National Instruments NI cDAQ-9172 - page 45
© National Instruments Corporation 45 NI cDAQ-9172 User Guide and Specifications Figure 19 shows an e xample of a single pulse-width measurement. Figure 19. Single Pulse-Wid th Measurement Buffered Pulse-Width Measurement Buffered pulse-width measurement is simil ar to single pulse-width measurement, but buffered pulse-width measurement takes meas ...
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National Instruments NI cDAQ-9172 - page 46
NI cDAQ-9172 User Guide and Specifications 46 ni.com Note If you are using an external signal as the Source, at least one Source pulse should occur between each acti ve edge of the Gate signal. This condition ensures that correct values are returned b y the counter . If this condition is not met, consider using duplicate count prev ention, describe ...
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National Instruments NI cDAQ-9172 - page 47
© National Instruments Corporation 47 NI cDAQ-9172 User Guide and Specifications Buffered Period Measurement Buffered period measurem ent is similar to single period measu rement, but buffered period measurem ent measures multiple periods. The counter counts the number of rising (or falling) edges on the Source input between each pair of acti ve e ...
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National Instruments NI cDAQ-9172 - page 48
NI cDAQ-9172 User Guide and Specifications 48 ni.com Semi-Period Measurement In semi-period measuremen ts, the counter measures a sem i-period on its Gate input signal after the counter is arme d. A semi-period is the time between any two consecutive edges on the Gate input. Y ou can route an internal or exte rna l periodic cloc k signal (with a kn ...
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National Instruments NI cDAQ-9172 - page 49
© National Instruments Corporation 49 NI cDAQ-9172 User Guide and Specifications Note If you are using an external signal as the Source, at least one Source pulse should occur between each acti ve edge of the Gate signal. This condition ensures that correct values are returned b y the counter . If this condition is not met, consider using duplicat ...
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National Instruments NI cDAQ-9172 - page 50
NI cDAQ-9172 User Guide and Specifications 50 ni.com Method 1b—Measure Low Frequency With One Counter (Averaged) This method is good for lo w to medium frequency signals. Use this me thod to measure several periods of your signal using a know n timebase. Figure 25 illustrates this meth od. Figure 25. Frequency Measurement—Method 1b Y ou can rou ...
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National Instruments NI cDAQ-9172 - page 51
© National Instruments Corporation 51 NI cDAQ-9172 User Guide and Specifications Method 2—Measure High Frequency With T wo Counters This method is good for high frequency signals. Use this me thod to measure one pulse of a known width using your sign al and derive the frequency of your signal from th e resu lt. Figure 26 illustrates this meth od ...
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National Instruments NI cDAQ-9172 - page 52
NI cDAQ-9172 User Guide and Specifications 52 ni.com Y ou can route the signal to measur e to the Source input of Counter 0, as sho wn in Figure 27. Assume this signal to measure has frequency F1. Configure Counter 0 to generate a single pulse that is the width of N periods of the source input signal. Figure 27. Frequency Measurement—Method 3 The ...
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National Instruments NI cDAQ-9172 - page 53
© National Instruments Corporation 53 NI cDAQ-9172 User Guide and Specifications Choosing a Method for Measuring Frequency The best method to measure frequency depends on several factors including the expected frequency of th e signal to measures, the desired accuracy, how many counters are avai lable and how long the measurement can take. • Met ...
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National Instruments NI cDAQ-9172 - page 54
NI cDAQ-9172 User Guide and Specifications 54 ni.com T able 6 summarizes some of the di f ferences in meth ods of measurin g frequency . For information on connecting counter signal s, refer to the Default Counter/Timer Routing section. Position Measurement You can use the count ers to perf orm position measurements with quadratur e encoders or t w ...
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National Instruments NI cDAQ-9172 - page 55
© National Instruments Corporation 55 NI cDAQ-9172 User Guide and Specifications Figure 28 sho ws a quadrature c ycle and the resulting increments and decrements for X1 encoding. When channel A leads channel B, the increment occurs on the rising edge of channel A. When channel B leads channel A, the decrement occurs on the f alling edge of channel ...
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National Instruments NI cDAQ-9172 - page 56
NI cDAQ-9172 User Guide and Specifications 56 ni.com Channel Z Behavior Some quadrature encoders have a thir d channel, channel Z, which is also referred to as the index channel. A high l evel on channel Z causes the counter to b e reloaded w ith a specifi ed value in a specified phase of the quadrature cycle. You can program this reload to occur i ...
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National Instruments NI cDAQ-9172 - page 57
© National Instruments Corporation 57 NI cDAQ-9172 User Guide and Specifications Measurements Using T wo Pulse Encoders The counter supports two pulse enco ders that have two channels—channels A and B. The counter increments on each rising edge of channel A. The counter decrements on each rising edge of channel B, as shown in Figure 32. Figure 3 ...
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National Instruments NI cDAQ-9172 - page 58
NI cDAQ-9172 User Guide and Specifications 58 ni.com Figure 33 shows an e xample of a si ngle two-signal edge-separation measurement. Figure 33. Single T wo-Signal Edge-Sep aration Measurement Buffered T wo-Signal Edge- Separation Measurement Buffered and single two-signal edge-sep aration measurements are similar, but buffered measurement m easure ...
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National Instruments NI cDAQ-9172 - page 59
© National Instruments Corporation 59 NI cDAQ-9172 User Guide and Specifications Counter Output Applications Simple Pulse Generation The counter can output a single pulse. The pulse appears on the Counter n Internal Output sign al of the counter. Y ou can specify a delay from when the counter is arm ed to the beginning of the pulse. The delay is m ...
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National Instruments NI cDAQ-9172 - page 60
NI cDAQ-9172 User Guide and Specifications 60 ni.com Figure 36 shows a generation of a pulse with a pulse delay of four and a pulse width of three (using the rising edge of Sou rce). Figure 36. Single Pulse Generation with Start T rigger Retriggerable Single Pulse Generation The counter can output a single pulse in response to each pulse on a hardw ...
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National Instruments NI cDAQ-9172 - page 61
© National Instruments Corporation 61 NI cDAQ-9172 User Guide and Specifications Pulse T rain Generation Continuous Pulse T rain Generation This function generates a train of pulses with programmable frequency and duty cycle. The pulses appear on the Counter n Internal Output signal of the counter. Y ou can specify a delay from when the counter is ...
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National Instruments NI cDAQ-9172 - page 62
NI cDAQ-9172 User Guide and Specifications 62 ni.com Frequency Generation You can generate a frequency by using a counter in pulse train generation mode or by using the frequency generator circui t. Using the Frequency Generator The frequency generator can output a square wave at many different frequencies. The frequency genera tor is independen t ...
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National Instruments NI cDAQ-9172 - page 63
© National Instruments Corporation 63 NI cDAQ-9172 User Guide and Specifications Frequenc y Output can be routed to any output PFI terminal. The FREQ OUT signal also can be routed to DO Sample Clock and DI Sample Clock. In software, program th e frequency ge nerator as you would program one of the counters for pulse train generation. For informati ...
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National Instruments NI cDAQ-9172 - page 64
NI cDAQ-9172 User Guide and Specifications 64 ni.com Counter n Source Signal The selected edge of the Counter n Source signal increments and decrements the counter value, depend ing upon the application the counter is performing. Table 7 lists how this terminal is used in variou s applications. Table 8 lists Co unter n Source minimum pulse width. R ...
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National Instruments NI cDAQ-9172 - page 65
© National Instruments Corporation 65 NI cDAQ-9172 User Guide and Specifications Routing Counter n Source to an Output T erminal You can route Counter n Source to any output PFI terminal. Counter n Gate Signal The Counter n Gate signal can perform many differen t operations depending on the application includi ng starting and stopping the counter, ...
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National Instruments NI cDAQ-9172 - page 66
NI cDAQ-9172 User Guide and Specifications 66 ni.com Routing a Signal to Counter n Aux Each counter has independent input selectors for the Counter n Au x signal. You can route the foll owing signals to the Counter n Aux input: • Any PFI termin al • ai/ReferenceT rigger • ai/StartTrigger • Analog Comparison Event In addition, you can route ...
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National Instruments NI cDAQ-9172 - page 67
© National Instruments Corporation 67 NI cDAQ-9172 User Guide and Specifications waiting for the Gate signal w hen it is armed. Counter o utput operations can use the arm signal in addition to a start trigger . Software can arm a counter or configure counters to be armed on a hardware signal. Software calls this ha rdware signal the Arm Start T ri ...
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National Instruments NI cDAQ-9172 - page 68
NI cDAQ-9172 User Guide and Specifications 68 ni.com Default Counter/Timer Routing Counter/timer signals are available to correlated digital I/O C Series modules in slots 5 and/or 6. To determine the signal routin g options for modules installed in your system, refer to the Device Routes tab in MAX. Counter T riggering Counters support three differ ...
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National Instruments NI cDAQ-9172 - page 69
© National Instruments Corporation 69 NI cDAQ-9172 User Guide and Specifications Other Counter Features Cascading Counters You can internally route the Counter n Internal Output and Counter n TC signals of each counter to the Gate inpu ts of the other counter. By cascading two counters together, you can effectively create a 64-bit counter. By casc ...
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National Instruments NI cDAQ-9172 - page 70
NI cDAQ-9172 User Guide and Specifications 70 ni.com Y ou can configure the f ilter setting fo r each input independ ently . On po wer up, the filters are dis abled. Figure 41 sho ws an example of a lo w to high transition on an input with its filter set to 125 ns (N = 5). Figure 41. Filter Example Enabling filters introduces jitter on the input si ...
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National Instruments NI cDAQ-9172 - page 71
© National Instruments Corporation 71 NI cDAQ-9172 User Guide and Specifications Duplicate Count Prevention Duplicate count preven tion (or synchronous coun ting mode) ensures that a counter returns correct dat a in applications that use a slow or non-peri odic external source. Duplicate count pr evention applie s only to buffered counter applicat ...
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National Instruments NI cDAQ-9172 - page 72
NI cDAQ-9172 User Guide and Specifications 72 ni.com Example Application That Works Incorrectly (Duplicate Counting) In Figure 44, after the first rising edge of Gate, no Source pulses occur, which means that the counter does not write the correct data to the buffer. Figure 44. Duplicate Count Example Example Application That Prevents Duplicate Cou ...
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National Instruments NI cDAQ-9172 - page 73
© National Instruments Corporation 73 NI cDAQ-9172 User Guide and Specifications Even if the Source pulses are long, the counter increments only once for each Source pulse. Normally , the counter value and Counter n Internal Output signals change synchronously to the Source signal. With duplicate count prev ention, the counter value and Counter n ...
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National Instruments NI cDAQ-9172 - page 74
NI cDAQ-9172 User Guide and Specifications 74 ni.com Otherwise, the mode depends on the signal that drives Counter n Source. T able 10 describes the conditions for each mode. 80 MHz Source Mode In 80 MHz source mode, the NI cDAQ-9172 synchron izes signals on the rising edge of the source, and counts on the follo wing rising edge of the source, as s ...
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National Instruments NI cDAQ-9172 - page 75
© National Instruments Corporation 75 NI cDAQ-9172 User Guide and Specifications External Source Mode In external source mode, the chassis gen erates a delayed Source signal by delaying th e Source signal by seve ral nanoseconds. The NI cDAQ-9172 chassis synchronizes signals on the rising edg e of the delayed Source signal and counts on the follow ...
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National Instruments NI cDAQ-9172 - page 76
NI cDAQ-9172 User Guide and Specifications 76 ni.com Clock Routing Figure 49 shows the clock routing circui try of the NI cDAQ-9172 chassis. Figure 49. NI cDAQ-9 172 Clock Routing Cir cuitry 80 MHz Timebase You can use the 80 MHz Timebase as the Source input to the 32-bit general-purpose counter/timers. The 80 MHz T imebase can be generated from th ...
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National Instruments NI cDAQ-9172 - page 77
© National Instruments Corporation 77 NI cDAQ-9172 User Guide and Specifications Specifications These specifications are for the NI c DAQ-9172 chassis only. These specifications are typical at 25 °C unless otherwise noted. For the C Series I/O module specifications, refer to the documentation for the C Series I/O modules you are using. Analog Inp ...
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National Instruments NI cDAQ-9172 - page 78
NI cDAQ-9172 User Guide and Specifications 78 ni.com AO waveform modes ..................... .........Non-periodic waveform, periodic waveform regeneratio n mode from onboard memory, periodic waveform regeneratio n from host buff er includin g dynamic update Digital W aveform Characteris tics (Slots 1 th rough 4 Only) 1 Waveform acquisition (DI) FI ...
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National Instruments NI cDAQ-9172 - page 79
© National Instruments Corporation 79 NI cDAQ-9172 User Guide and Specifications Debounce filter settings .......... ............... Selectable per input: 125 ns, 6.425 µs, 2.56 ms, disable, high and low transitio ns Timing input frequency ...................... .... 0 to 20 MHz Timing output frequency .................... .... 0 to 20 MHz Genera ...
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National Instruments NI cDAQ-9172 - page 80
NI cDAQ-9172 User Guide and Specifications 80 ni.com Frequency Generator (Slots 5 and 6 Only) Number of channels ......... ................. ......1 Base clocks ................ .............. .............. .10 MHz, 100 kHz Divisors ...................... .............. .............. .1 to 16 (integers) Base clock accuracy ......... ........... . ...
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National Instruments NI cDAQ-9172 - page 81
© National Instruments Corporation 81 NI cDAQ-9172 User Guide and Specifications Input voltage range..................... ............ 11 V to 30 V Maximum required input power ........... . 15 W Power input connector . .............. ..... ....... DC input jack with lockin g, threaded ring 0.8 in. (2 mm) center pin Power input mating connector .. ...
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National Instruments NI cDAQ-9172 - page 82
NI cDAQ-9172 User Guide and Specifications 82 ni.com Environmental The NI cDAQ-9172 chassis is intended for indoor use only. For outdoor use, mount the system in a suitably rated enclosure. Operating temperature 1 (IEC-60068-2-1 and IEC-60068-2-2) .....–2 0 to 55 °C Storage temperature (IEC-60068-2-1 and IEC-600 68-2-2) .....– 40 to 85 °C Ing ...
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National Instruments NI cDAQ-9172 - page 83
© National Instruments Corporation 83 NI cDAQ-9172 User Guide and Specifications Electromagnetic Compatibility This product is designed to meet the requirements of the follow ing standards of EMC for el ectrical equipment for m easurement, control, and laboratory use: • EN 61326 EMC requirements; Min imum Immunity • EN 55011 Emissions; Group 1 ...
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National Instruments NI cDAQ-9172 - page 84
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