National Instruments NI cDAQ-9172 - Manual

© 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»Nation...

NI cDAQ-9172 User Guide and Specifications 8 ni.com LabWindows ™ /CVI ™ LabWindows/CVI Help Data Acquisition book—contains NI-DAQmx measurement concepts and step-by-step instructions about creating a measurement task using the DAQ Assistant. Help»Contents , then select Using LabWindows/CVI»Data Acqu...

© 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 Web access, NI-DAQmx includes a Documentation CD that includes documentation availab...

NI cDAQ-9172 User Guide and Specifications 10 ni.com Installing the Software Installing NI-DAQmx The DAQ Getting Started Guide , which you can download at ni.com/ manual s , offers NI-DAQmx users step-by-step instructions for installing software and hardware, configuring channels and tasks, and gett...

© National Instruments Corporation 11 NI cDAQ-9172 User Guide and Specifications Installing the NI cDAQ-9172 Figure 2 shows the dimensions of the NI cDAQ-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...

NI cDAQ-9172 User Guide and Specifications 12 ni.com Mounting the NI cDAQ-9172 You can mount the NI cDAQ-9172 chassis using a desktop, a 35 mm DIN-Rail, or a panel mount accessory kit. For accessory ordering information, refer to ni.com . Caution Your installation must meet the following requirement...

© National Instruments Corporation 13 NI cDAQ-9172 User Guide and Specifications NI 9910 DIN-Rail Kit The NI 9910 DIN-Rail Kit contains one clip for mounting the chassis on a standard 35 mm DIN-Rail. To mount the chassis on a DIN-Rail, fasten the DIN-Rail clip to the chassis using a number 2 Phillip...

© National Instruments Corporation 15 NI cDAQ-9172 User Guide and Specifications Setting Up the NI cDAQ-9172 Complete the following steps to prepare the NI cDAQ-9172 chassis for use: 1. Before connecting the hardware, install the NI-DAQmx software. Refer to the DAQ Getting Started Guide for more inf...

NI cDAQ-9172 User Guide and Specifications 16 ni.com 6. Squeeze both C Series I/O module latches, insert the I/O module into the module slot, and press until both latches lock the module in place. 7. Connect the NI cDAQ-9172 chassis with the supplied USB cable to any available USB port on your compu...

© 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 ...

NI cDAQ-9172 User Guide and Specifications 18 ni.com Using the NI cDAQ-9172 The cDAQ system consists of three parts: C Series I/O modules, the cDAQ module interface, and the USB-STC2. These components digitize signals, perform D/A conversions to generate analog output signals, measure and control di...

© National Instruments Corporation 19 NI cDAQ-9172 User Guide and Specifications To 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 determined by the type of digital signals that the module is capable...

NI cDAQ-9172 User Guide and Specifications 20 ni.com PFI Signals The PFI signals, available through correlated 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...

© National Instruments Corporation 21 NI cDAQ-9172 User Guide and Specifications triggers can come from three separate modules if desired. To find your module triggering options, refer to the documentation included with your C Series I/O modules. For more information about using digital modules for ...

NI cDAQ-9172 User Guide and Specifications 22 ni.com Using an Analog Source Some C Series I/O modules can generate a trigger based on an analog signal. In NI-DAQmx, this is called the Analog Comparison Event.When you use an analog trigger source for ai/StartTrigger, the acquisition begins on the fir...

NI cDAQ-9172 User Guide and Specifications 24 ni.com AI Pause Trigger Signal You can use the AI Pause Trigger (ai/PauseTrigger) signal to pause and resume a measurement acquisition. The internal sample clock pauses while the external trigger signal is active and resumes when the signal is inactive. ...

© National Instruments Corporation 25 NI cDAQ-9172 User Guide and Specifications Figure 10. Sample Clock Timing Options Routing AI Sample Clock to an Output Terminal You can route ai/SampleClock to any output PFI terminal. AI Sample Clock Timebase The AI Sample Clock Timebase (ai/SampleClockTimebase...

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 sample-and-hold (SSH) C Series analog input modules contain multiple A/D converters or circuitry that allo...

© National Instruments Corporation 27 NI cDAQ-9172 User Guide and Specifications Slow Sample Rate Modules Some C Series analog input modules are specifically designed for measuring signals that vary slowly, such as temperature. Because of their slow rate, it is not appropriate for these modules to c...

NI cDAQ-9172 User Guide and Specifications 28 ni.com Getting Started with AI Applications in Software You can use the NI cDAQ-9172 chassis in the following analog input applications: • Single-Point • Finite • Continuous For more information about programming analog input applications and triggers in...

© National Instruments Corporation 29 NI cDAQ-9172 User Guide and Specifications Software-Timed Generations With a software-timed generation, software controls the rate at which data is generated. Software sends a separate command to the hardware to initiate each DAC conversion. In NI-DAQmx, softwar...

NI cDAQ-9172 User Guide and Specifications 30 ni.com One property of buffered I/O operations is sample mode. The sample mode can be either finite or continuous: • Finite—Finite sample mode generation refers to the generation of a specific, predetermined number of data samples. After the specified nu...

© National Instruments Corporation 31 NI cDAQ-9172 User Guide and Specifications Analog Output Timing Signals The NI cDAQ-9172 chassis features the following AO (waveform generation) timing signals: • AO Sample Clock • AO Start Trigger • AO Pause Trigger AO Sample Clock The AO sample clock (ao/Sampl...

NI cDAQ-9172 User Guide and Specifications 32 ni.com more information, refer to the NI-DAQmx Help . The NI-DAQmx Help is available after installation from Start»All Programs»National Instruments»NI-DAQ»NI-DAQmx Help . Using a Digital Source To use ao/StartTrigger, specify a source and a rising or fa...

© National Instruments Corporation 33 NI cDAQ-9172 User Guide and Specifications AO Pause Trigger Signal Use the AO Pause trigger signal (ao/PauseTrigger) to mask off samples in a DAQ sequence. When ao/PauseTrigger is active, no samples occur, but ao/PauseTrigger does not stop a sample that is in pr...

NI cDAQ-9172 User Guide and Specifications 34 ni.com The NI-DAQmx Help is available after installation from Start» All Programs»National Instruments»NI-DAQ»NI-DAQmx Help . To view the LabVIEW Help, in version 8.0 or later, select Help»Search the LabVIEW Help in LabVIEW. Alternately, to download the ...

© 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 module into any slot onthe NI cDAQ-9172 chassis. The I/O specifications, such as number of lines, logic levels, update rate, and line direction, are determin...

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 control digital signals on some C Series I/O modules. Each DIO line can be individually configured as a digital input (DI) or digita...

© National Instruments Corporation 37 NI cDAQ-9172 User Guide and Specifications Using an Internal Source To use di/SampleClock with an internal source, specify the signal source and the polarity of the signal. Use the following signals as the source: • AI Sample Clock • AI Convert Clock • AO Sample...

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 mod...

© 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 the rising or falling edge lines is detected by the change detection task. Routing Change Detection Event to an Output Terminal ...

NI cDAQ-9172 User Guide and Specifications 40 ni.com PFI You can configure channels of a correlated digital module in slots 5 and 6 as Programmable Function Interface (PFI) terminals. You can configure each PFI individually as the following: • Static digital input • Static digital output • Timing in...

© National Instruments Corporation 41 NI cDAQ-9172 User Guide and Specifications Figure 15. NI cDAQ-9172 Counters Counters have seven input signals, although in most applications only a few inputs are used. For information about connecting the counter signals, refer to the Default Counter/Timer Rout...

NI cDAQ-9172 User Guide and Specifications 42 ni.com Counter Input Applications Counting Edges In edge counting applications, the counter 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 th...

NI cDAQ-9172 User Guide and Specifications 44 ni.com Controlling the Direction of Counting In edge counting applications, the counter can count up or down. You can configure the counter to do the following: • Always count up • Always count down • Count up when the Counter n B input is high; count do...

© National Instruments Corporation 45 NI cDAQ-9172 User Guide and Specifications Figure 19 shows an example of a single pulse-width measurement. Figure 19. Single Pulse-Width Measurement Buffered Pulse-Width Measurement Buffered pulse-width measurement is similar to single pulse-width measurement, b...

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 active edge of the Gate signal. This condition ensures that correct values are returned by the counter. If this condition is not met, consi...

© National Instruments Corporation 47 NI cDAQ-9172 User Guide and Specifications Buffered Period Measurement Buffered period measurement is similar to single period measurement,but buffered period measurement measures multiple periods. The counter counts the number of rising (or falling) edges on th...

NI cDAQ-9172 User Guide and Specifications 48 ni.com Semi-Period Measurement In semi-period measurements, the counter measures a semi-period on its Gate input signal after the counter is armed. A semi-period is the time between any two consecutive edges on the Gate input. You can route an internal o...

© 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 active edge of the Gate signal. This condition ensures that correct values are returned by the counter. If this...

© National Instruments Corporation 51 NI cDAQ-9172 User Guide and Specifications Method 2—Measure High Frequency With Two Counters This method is good for high frequency signals. Use this method to measure one pulse of a known width using your signal and derive the frequency of your signal from the ...

NI cDAQ-9172 User Guide and Specifications 52 ni.com You can route the signal to measure to the Source input of Counter 0, as shown 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. ...

© 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 the signal to measures, the desired accuracy, how many counters are available...

NI cDAQ-9172 User Guide and Specifications 54 ni.com Table 6 summarizes some of the differences in methods of measuring frequency. For information on connecting counter signals, refer to the Default Counter/Timer Routing section. Position Measurement You can use the counters to perform position meas...

© National Instruments Corporation 55 NI cDAQ-9172 User Guide and Specifications Figure 28 shows a quadrature cycle 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 d...

NI cDAQ-9172 User Guide and Specifications 56 ni.com Channel Z Behavior Some quadrature encoders have a third channel, channel Z, which is also referred to as the index channel. A high level on channel Z causes the counter to be reloaded with a specified value in a specified phase of the quadrature ...

© National Instruments Corporation 57 NI cDAQ-9172 User Guide and Specifications Measurements Using Two Pulse Encoders The counter supports two pulse encoders 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 ...

NI cDAQ-9172 User Guide and Specifications 58 ni.com Figure 33 shows an example of a single two-signal edge-separation measurement. Figure 33. Single Two-Signal Edge-Separation Measurement Buffered Two-Signal Edge-Separation Measurement Buffered and single two-signal edge-separation measurements are...

© 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 signal of the counter. You can specify a delay from when the counter is armed...

© National Instruments Corporation 61 NI cDAQ-9172 User Guide and Specifications Pulse Train Generation Continuous Pulse Train 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. Yo...

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 circuit. Using the Frequency Generator The frequency generator can output a square wave at many different frequ...

© National Instruments Corporation 63 NI cDAQ-9172 User Guide and Specifications Frequency 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 the frequency generator as you would program one of the coun...

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, depending upon the application the counter is performing. Table 7 lists how this terminal is used in various applications. Table ...

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 Aux signal. You can route the following signals to the Counter n Aux input: • Any PFI terminal • ai/ReferenceTrigger • ai/StartTrigger • Analog Compar...

© National Instruments Corporation 67 NI cDAQ-9172 User Guide and Specifications waiting for the Gate signal when it is armed. Counter output 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 ...

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 routing options for modules installed in your system, refer to the Device Routes tab in MAX. ...

© 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 inputs of the other counter. By cascading two counters together, you ...

© National Instruments Corporation 71 NI cDAQ-9172 User Guide and Specifications Duplicate Count Prevention Duplicate count prevention (or synchronous counting mode) ensures that a counter returns correct data in applications that use a slow or non-periodic external source. Duplicate count preventio...

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 Examp...

© 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 cou...

NI cDAQ-9172 User Guide and Specifications 74 ni.com Otherwise, the mode depends on the signal that drives Counter n Source. Table 10 describes the conditions for each mode. 80 MHz Source Mode In 80 MHz source mode, the NI cDAQ-9172 synchronizes signals on the rising edge of the source, and counts o...

© National Instruments Corporation 75 NI cDAQ-9172 User Guide and Specifications External Source Mode In external source mode, the chassis generates a delayed Source signal by delaying the Source signal by several nanoseconds. The NI cDAQ-9172 chassis synchronizes signals on the rising edge of the d...

NI cDAQ-9172 User Guide and Specifications 76 ni.com Clock Routing Figure 49 shows the clock routing circuitry of the NI cDAQ-9172 chassis. Figure 49. NI cDAQ-9172 Clock Routing Circuitry 80 MHz Timebase You can use the 80 MHz Timebase as the Source input to the 32-bit general-purpose counter/timers...

© National Instruments Corporation 77 NI cDAQ-9172 User Guide and Specifications Specifications These specifications are for the NI cDAQ-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...

NI cDAQ-9172 User Guide and Specifications 78 ni.com AO waveform modes ..............................Non-periodic waveform, periodic waveform regeneration mode from onboard memory, periodic waveform regeneration from host buffer including dynamic update Digital Waveform Characteristics (Slots 1 thro...

© 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 transitions Timing input frequency.......................... 0 to 20 MHz Timing output frequency ...

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) B...

© 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 locking, threaded ring 0.8 in. (2 mm)...

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) .....–20 to 55 °C Storage temperature(IEC-60068-2-1 ...

© National Instruments Corporation 83 NI cDAQ-9172 User Guide and Specifications Electromagnetic Compatibility This product is designed to meet the requirements of the following standards of EMC for electrical equipment for measurement, control, and laboratory use: • EN 61326 EMC requirements; Minim...

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