National Instruments Eight-slot USB Chassis NI cDAQ-9172 User Manual
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National Instruments Eight-slot USB Chassis NI cDAQ-9172 User Manual

User guide and specifications
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USER GUIDE AND SPECIFICATIONS
NI cDAQ-9172
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Contents
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ni.com/manuals
Introduction ............................................................................................. 4
Safety Guidelines .................................................................................... 5
Safety Guidelines for Hazardous Voltages ...................................... 5
Related Documentation........................................................................... 6
Device Documentation and Specifications ...................................... 9
Training Courses.............................................................................. 9
Technical Support on the Web......................................................... 9
Installing the Software ............................................................................ 10
Installing NI-DAQmx ...................................................................... 10
Installing Other Software................................................................. 10
Installing the NI cDAQ-9172.................................................................. 11
Mounting the NI cDAQ-9172.......................................................... 12
NI 9901 Desktop Mounting Kit................................................ 12
NI 9910 DIN-Rail Kit............................................................... 13
NI 9905 Panel Mount Kit ......................................................... 13
Setting Up the NI cDAQ-9172................................................................ 15
Understanding LED Indications.............................................................. 17
Active LED ...................................................................................... 17
Ready LED ...................................................................................... 17
Using the NI cDAQ-9172 ....................................................................... 18
C Series I/O Modules....................................................................... 18
Correlated vs. Static DIO Modules........................................... 19
cDAQ Module Interface .................................................................. 19
USB-STC2 ....................................................................................... 19
AI and AO Sample Timing....................................................... 19
Triggering Modes ..................................................................... 19
Independent Data Streams ........................................................ 19
PFI Signals................................................................................ 20
Flexible Counter/Timers........................................................... 20

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Summary of Contents for National Instruments Eight-slot USB Chassis NI cDAQ-9172

  • Page 1: Table Of Contents

    USER GUIDE AND SPECIFICATIONS NI cDAQ-9172 Français Contents Introduction ... 4 Safety Guidelines ... 5 Related Documentation... 6 Installing the Software ... 10 Installing the NI cDAQ-9172... 11 Setting Up the NI cDAQ-9172... 15 Understanding LED Indications... 17 Using the NI cDAQ-9172 ... 18 Deutsch ni.com/manuals Safety Guidelines for Hazardous Voltages ...
  • Page 2 Analog Input ...20 Analog Output ...28 Digital I/O...35 PFI ...40 Counters...40 NI cDAQ-9172 User Guide and Specifications Analog Input Triggering...20 AI Start Trigger Signal...21 AI Reference Trigger Signal ...22 AI Pause Trigger Signal ...24 Analog Input Timing Signals ...24 AI Sample Clock ...24 AI Sample Clock Timebase...25 Convert Behavior For Analog Input Modules...25 Getting Started with AI Applications in Software ...28...
  • Page 3 Digital Routing and Clock Generation... 75 Specifications ... 77 Where to Go for Support... 84 © National Instruments Corporation Counter Timing Signals ... 63 Counter n Source Signal ... 64 Counter n Gate Signal... 65 Counter n Aux Signal ... 65 Counter n A, Counter n B, and Counter n Z Signals ...

  • Page 4: Introduction

    Introduction This user guide describes how to use the National Instruments cDAQ-9172 chassis and lists specifications. For an interactive demonstration of how to install the NI cDAQ-9172, go to The NI cDAQ-9172 is an eight-slot USB chassis designed for use with C Series I/O modules.

  • Page 5: Safety Guidelines

    Caution The NI cDAQ-9172 chassis provides no isolation, but some modules offer isolation. Follow the safety guidelines for each module when using hazardous voltage. © National Instruments Corporation Using the NI cDAQ-9172 section of this document for NI cDAQ-9172 User Guide and Specifications...

  • Page 6: Related Documentation

    OS and ADE; provides an NI-DAQmx overview; includes information about programming the most common measurement tasks with references to examples in CVI/C, C++, .NET. Location/Topic Start»Programs» National Instruments» NI-DAQ»DAQ Getting Started Guide Start»Programs» National Instruments» NI-DAQ»NI-DAQ Readme Start»Programs» National Instruments» NI-DAQ»NI-DAQmx Help ni.com...
  • Page 7 Table 1. NI Driver and Application Software Documentation (Continued) Software LabVIEW © National Instruments Corporation Document/Description 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.
  • Page 8 NI-DAQmx Measurement in LabWindows/CVI LibraryReference» NI-DAQmx Library Measurement Studio» NI Measurement Studio Help and select NI-DAQmx .NET Class Library or NI-DAQmx Visual C++ Class Library Start»All Programs» National Instruments» NI-DAQ»NI-DAQmx Help Start»All Programs» National Instruments» NI-DAQ»NI-DAQmx C Reference Help ni.com...

  • Page 9: Device Documentation And Specifications

    NI products, NI offers training courses. To enroll in a course or obtain a detailed course outline, refer to Technical Support on the Web For additional support, refer to © National Instruments Corporation Document/Description NI-DAQmx .NET Help—contains conceptual topics for using NI-DAQmx with Visual C# and Visual Basic .NET.

  • Page 10: Installing The Software

    Installing the Software Installing NI-DAQmx The DAQ Getting Started Guide, which you can download at manuals software and hardware, configuring channels and tasks, and getting started developing an application. Installing Other Software If you are using other software, refer to the installation instructions that accompany your software.

  • Page 11: Installing The Ni Cdaq-9172

    24.8 mm (0.98 in.) 58.9 mm (2.32 in.) 31.7 mm (1.25 in.) 19.1 mm (0.75 in.) 23.2 mm (0.91 in.) © National Instruments Corporation 165.1 mm (6.50 in.) NI cDAQ-9172 Ready Active 15 W 254.0 mm (10.00 in.) 23.7 mm (0.94 in.)

  • Page 12: Mounting The Ni Cdaq-9172

    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 Caution Your installation must meet the following requirements: • Allows 25.4 mm (1 in.) of clearance above and below the NI cDAQ-9172 chassis for air circulation.

  • Page 13: Ni 9910 Din-Rail Kit

    To mount the chassis on a panel, align the chassis on the panel mount accessory. Attach the chassis to the panel mount kit using two M4 × 17 screws (as shown in Figure 5). National Instruments provides these screws with the panel mount kit. You must use these screws because they are the correct depth and thread for the panel.
  • Page 14 can be used with M4, M5, No. 8, or No.10 panhead screws. Figure 5 illustrates the panel dimensions and installation on the NI cDAQ-9172 chassis. Refer to the documentation included with the NI 9905 Panel Mount Kit for more detailed dimensions. NATIONAL INSTRUMENTS NI cDAQ-9172...

  • Page 15: Setting Up The Ni Cdaq-9172

    Note The NI-DAQmx software is included on the CD shipped with your kit and is available for download at after installation from Start»All Programs»National Instruments»NI-DAQ»DAQ Getting Started Guide. Other NI documentation is available from 1 Attached to System Ground Additionally, attach a wire with a ring lug to all other C Series I/O module cable Note shields.
  • Page 16 The NI cDAQ-9172 chassis uses a DC input jack with a locking ring. Use only this Note connector with the NI cDAQ-9172 chassis. Refer to the information about the connector. 10. Power on the NI cDAQ-9172 chassis. 11. Double-click the Measurement & Automation icon, shown at left, 12.

  • Page 17: Understanding Led Indications

    The Ready LED is lit when the NI cDAQ-9172 chassis is ready for use. The color indicates whether the USB connection is Full-Speed or Hi-Speed. Amber Green © National Instruments Corporation device does not appear, press <F5> to refresh the view in MAX. If your device is still not recognized, refer to troubleshooting information.

  • Page 18: Using The Ni Cdaq-9172

    C Series I/O Module C Series I/O Modules National Instruments C Series I/O modules provide built-in signal conditioning and screw terminal, spring terminal, BNC, D-SUB, or RJ-50 connectors. A wide variety of I/O types are available, allowing you to customize the cDAQ system to meet your application needs.

  • Page 19: Correlated Vs. Static Dio Modules

    The NI cDAQ-9172 supports four independent high-speed data streams; allowing for up to four simultaneous hardware timed tasks, such as analog input, analog output, buffered counter/timers, and correlated digital input/output. © National Instruments Corporation rdcdaq Digital I/O section. Analog Input Timing Signals...

  • Page 20: Pfi Signals

    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 section for more information. The PFI pins have a digital filter circuit at the inputs that is configurable on a per-line basis.

  • Page 21: Ai Start Trigger Signal

    NI-DAQmx Help or the LabVIEW Help in version 8.0 or later for more information. 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...

  • Page 22: Ai Reference Trigger Signal

    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 first rising edge of the Analog Comparison Event signal. Routing AI Start Trigger to an Output Terminal You can route ai/StartTrigger to any output PFI terminal.
  • Page 23 NI-DAQmx Help or the LabVIEW Help in version 8.0 or later for more information. 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 LabVIEW Help, go to ni.com/manuals...

  • Page 24: Ai Pause Trigger Signal

    NI-DAQmx Help or the LabVIEW Help in version 8.0 or later for more information. 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...

  • Page 25: Ai Sample Clock Timebase

    AI Convert Clock pulses evenly throughout the sample. NI-DAQmx uses the same amount of padding for all the modules in the task. To explicitly specify the conversion rate, use the © National Instruments Corporation NI cDAQ-9172 User Guide and Specifications...
  • Page 26 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 allows all the input channels to be sampled at the same time. These modules sample their inputs on every Sample Clock pulse.

  • Page 27: Slow Sample Rate Modules

    Refer to the KnowledgeBase document, C Series Modules Supported in the NI cDAQ-9172 CompactDAQ, for more information. To access this KnowledgeBase, go to © National Instruments Corporation 2nd A/D Conversion Figure 11. Sample Clock Timing Example and enter the info code ni.com/info...

  • Page 28: Getting Started With Ai Applications In Software

    8.0 or later for more information. 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...

  • Page 29: Software-Timed Generations

    NI cDAQ-9172 onboard FIFO before it is written to the C Series I/O modules. © National Instruments Corporation If any AO channel on a module is used in a hardware-timed (waveform) task, no channels on that module can be used in a software-timed task.

  • Page 30: Analog Output Triggering

    One property of buffered I/O operations is sample mode. The sample mode can be either finite or continuous: • • Analog Output Triggering Analog output supports two different triggering actions: • • An analog or digital trigger can initiate these actions. Any C Series correlated digital module in slots 5 and/or 6 can supply a digital trigger, and some C Series analog modules can supply an analog trigger.

  • Page 31: Analog Output Timing Signals

    If you do not use triggers, you can begin a generation with a software command. If you are using an internal sample clock, you can specify a delay from the start trigger to the first sample. For © National Instruments Corporation AO Sample Clock AO Start Trigger...
  • Page 32 LabVIEW Help in version 8.0 or later for more information. 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...

  • Page 33: Ao Pause Trigger Signal

    Refer to the Device Routing in MAX topic in the NI-DAQmx Help or the LabVIEW Help in version 8.0 or later for more information. © National Instruments Corporation NI cDAQ-9172 User Guide and Specifications...

  • Page 34: Minimizing Glitches On The Output Signal

    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 LabVIEW Help, go to Using an Analog Source Some C Series I/O modules can generate a trigger based on an analog signal.

  • Page 35: Digital I/O

    I/O C Series module and the capabilities of the module. Slots Static DIO © National Instruments Corporation Used in any slot—Software-timed reads and writes Used in slots 1 though 4—Digital waveform generation and acquisition (correlated input/output) Used in slots 5 and 6—Counter/timer...

  • Page 36: Static Dio

    Table 4. Digital Module Slot Features (Continued) Slots Static DIO Requires the use of a correlated digital I/O module. 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.

  • Page 37: Digital Waveform Generation (Correlated Output)

    8.0 or later for more information. 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...

  • Page 38: Buffered Digital Waveform Generation

    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.

  • Page 39: Change Detection Event

    During the line configuration command, the output lines are maintained without glitching. © National Instruments Corporation Nonbuffered Change Detection Acquisition—In nonbuffered acquisitions, correlated digital input modules in any slot may be in the task, but the rising/falling edge detection lines must be in slots 1 through 4.

  • Page 40: Pfi

    The filters allow the rejection of noise caused by noisy environments, bounces on switches, and so on. Refer to the NI-DAQmx Help for more information. The NI-DAQmx Help is available after installation from Start»All Programs»National Instruments» NI-DAQ»NI-DAQmx Help. Counters The NI cDAQ-9172 chassis has two general-purpose 32-bit counter/timers and one frequency generator, as shown in Figure 15.
  • Page 41 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 Counter/Timer Routing counter applications. © National Instruments Corporation Counter 0 Counter 0 Source (Counter 0 Timebase) Counter 0 Gate Counter 0 Internal Output...

  • Page 42: Counter Input Applications

    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 the direction of counting (up or down).

  • Page 43: Buffered (Sample Clock) Edge Counting

    Figure 18 shows an example of buffered edge counting. Notice that counting begins when the counter is armed, which occurs before the first active edge on Gate. © National Instruments Corporation Counter Armed Pause Trigger (Pause When Low)

  • Page 44: Pulse-Width Measurement

    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: • • • For information on connecting counter signals, refer to the Counter/Timer Routing Pulse-Width Measurement In pulse-width measurements, the counter measures the width of a pulse on its Gate input signal.

  • Page 45: Buffered Pulse-Width Measurement

    Figure 20 shows an example of a buffered pulse-width measurement. GATE SOURCE Counter Value Buffer © National Instruments Corporation GATE SOURCE Counter Value Figure 19. Single Pulse-Width Measurement Figure 20. Buffered Pulse-Width Measurement NI cDAQ-9172 User Guide and Specifications...

  • Page 46: Period Measurement

    If you are using an external signal as the Source, at least one Source pulse should Note 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, consider using duplicate count prevention, described in the For information on connecting counter signals, refer to the Counter/Timer Routing...

  • Page 47: Buffered Period Measurement

    If this condition is not met, consider using duplicate count prevention, described in the For information about connecting counter signals, refer to the Counter/Timer Routing © National Instruments Corporation (Discard) Figure 22. Buffered Period Measurement Duplicate Count Prevention section.

  • Page 48: Single Semi-Period Measurement

    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 or external periodic clock signal (with a known period) to the Source input of the counter.

  • Page 49: Frequency Measurement

    0.02 Hz, use a slower known timebase. You can configure the counter to measure one period of the gate signal. The frequency of F1 is the inverse of the period. © National Instruments Corporation Duplicate Count Prevention section. Interval Measured …...

  • Page 50: Method 1B-Measure Low Frequency With One Counter (Averaged)

    Method 1b—Measure Low Frequency With One Counter (Averaged) This method is good for low to medium frequency signals. Use this method to measure several periods of your signal using a known timebase. Figure 25 illustrates this method. You can route the signal to measure (F1) to the Gate of a counter. You can route a known timebase (Ft) to the Source of the counter.

  • Page 51: Method 2-Measure High Frequency With Two Counters

    In this method, you generate a long pulse using the signal to measure. You then measure the long pulse with a known timebase. The NI cDAQ-9172 chassis can measure this long pulse more accurately than the faster input signal. © National Instruments Corporation Width of Pulse (T) Pulse …...
  • Page 52 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.
  • Page 53 Error % • • • © National Instruments Corporation Method 1 uses only one counter. It is a good method for many applications. However, the accuracy of the measurement decreases as the frequency increases. Consider a frequency measurement on a 50 kHz signal using an 80 MHz Timebase.

  • Page 54: Position Measurement

    Table 6 summarizes some of the differences in methods of measuring frequency. Table 6. Frequency Measurement Method Comparison Number of Method Counters Used 1 or 2 For information on connecting counter signals, refer to the Counter/Timer Routing Position Measurement You can use the counters to perform position measurements with quadrature encoders or two-pulse encoders.
  • Page 55 Each cycle results in four increments or decrements, as shown in Figure 30. Ch A Ch B Counter Value © National Instruments Corporation Ch A Ch B Counter Value Figure 28. X1 Encoding...

  • Page 56: Channel Z Behavior

    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 cycle.

  • Page 57: Two-Signal Edge-Separation Measurement

    Gate signal and an active edge of the AUX signal. The counter then stores the count in a hardware save register and ignores other edges on its inputs. Software then reads the stored count. © National Instruments Corporation Ch A Ch B Figure 32.

  • Page 58: Buffered Two-Signal Edge-Separation Measurement

    Figure 33 shows an example of a single two-signal edge-separation measurement. HW Save Register Buffered Two-Signal Edge-Separation Measurement Buffered and single two-signal edge-separation measurements are similar, but buffered measurement measures multiple intervals. The counter counts the number of rising (or falling) edges on the Source input occurring between an active edge of the Gate signal and an active edge of the AUX signal.

  • Page 59: Counter Output Applications

    The delay and pulse width are measured in terms of a number of active edges of the Source input. After the Start Trigger signal pulses once, the counter ignores the Gate input. © National Instruments Corporation Counter Armed SOURCE Figure 35. Single Pulse Generation...

  • Page 60: Retriggerable Single Pulse Generation

    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 Source). GATE (Start Trigger) SOURCE Figure 36. Single Pulse Generation with Start Trigger Retriggerable Single Pulse Generation The counter can output a single pulse in response to each pulse on a hardware Start Trigger signal.

  • Page 61: Pulse Train Generation

    Counter n Internal Output signal is equal to the frequency of the Source input divided by M + N. For information on connecting counter signals, refer to the Counter/Timer Routing © National Instruments Corporation SOURCE Counter Armed Figure 38. Continuous Pulse Train Generation section.

  • Page 62: Frequency Generation

    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 frequencies. The frequency generator is independent of the two general-purpose 32-bit counter/timer modules on the NI cDAQ-9172 chassis.

  • Page 63: Frequency Division

    In this section, n refers to either Counter 0 or 1. For example, Counter n Source refers to two signals—Counter 0 Source (the source input to Counter 0) and Counter 1 Source (the source input to Counter 1). © National Instruments Corporation section. section.

  • Page 64: Counter N Source Signal

    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 8 lists Counter n Source minimum pulse width. Pulse Generation One Counter Time Measurements Two Counter Time Measurements...

  • Page 65: Counter N Gate Signal

    Routing Counter n Gate to an Output Terminal You can route Counter n Gate to any output PFI terminal. Counter n Aux Signal The Counter n Aux signal indicates the first edge in a two-signal edge-separation measurement. © National Instruments Corporation Any PFI terminal ai/ReferenceTrigger ai/StartTrigger ai/SampleClock...

  • Page 66: Counter N A, Counter N B, And Counter N Z Signals

    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: • • • • In addition, you can route Counter 1 Internal Output, Counter 1 Gate, Counter 1 Source, or Counter 0 Gate to Counter 0 Aux.

  • Page 67: Counter N Internal Output And Counter N Tc Signals

    Routing Frequency Output to a Terminal You can route Frequency Output to any output PFI terminal. The FREQ OUT signal can also route to DO Sample Clock and DI Sample Clock. © National Instruments Corporation Any PFI terminal ai/ReferenceTrigger ai/StartTrigger...

  • Page 68: Default Counter/Timer Routing

    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. Counter Triggering Counters support three different triggering actions: •...

  • Page 69: Other Counter Features

    Table 9. N (Filter Clocks Filter Setting 125 ns 6.425 µs 2.56 ms Disabled © National Instruments Corporation Table 9. Counter Input Filters Pulse Width Needed to Guaranteed to Pass Signal) Pass Filter 125 ns 6.425 µs...

  • Page 70: Prescaling

    You can configure the filter setting for each input independently. On power up, the filters are disabled. Figure 41 shows an example of a low to high transition on an input with its filter set to 125 ns (N = 5). PFI Terminal Filter Clock (40 MHz)

  • Page 71: Duplicate Count Prevention

    Source edge after the rising edge of Gate. The details of when exactly the counter synchronizes the Gate signal vary depending on the synchronization mode. Synchronization modes are described in the © National Instruments Corporation Rising Edge of Gate Figure 43. Duplicate Count Prevention Example...

  • Page 72: Example Application That Works Incorrectly (Duplicate Counting)

    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. Gate Source Counter Value Buffer Example Application That Prevents Duplicate Count With duplicate count prevention enabled, the counter synchronizes both the Source and Gate signals to the 80 MHz Timebase.

  • Page 73: Synchronization Modes

    In NI-DAQmx, the chassis uses 80 MHz source mode if you perform the following: • • © National Instruments Corporation You are making a counter measurement. You are using an external signal (such as PFI x) as the counter Source. The frequency of the external source is 20 MHz or less.

  • Page 74: Other Internal Source Mode

    Otherwise, the mode depends on the signal that drives Counter n Source. Table 10 describes the conditions for each mode. Duplicate Count Prevention Enabled Position Measurement All Except Position Measurement All Except Position Measurement 80 MHz Source Mode In 80 MHz source mode, the NI cDAQ-9172 synchronizes signals on the rising edge of the source, and counts on the following rising edge of the source, as shown in Figure 46.

  • Page 75: Digital Routing And Clock Generation

    Digital Routing and Clock Generation The digital routing circuitry has the following functions: • • • © National Instruments Corporation Source Delayed Source Figure 48. External Source Mode Manages the flow of data between the bus interface and the acquisition/generation sub-systems (analog input, analog output, digital I/O, and the counters).

  • Page 76: Clock Routing

    Clock Routing Figure 49 shows the clock routing circuitry of the NI cDAQ-9172 chassis. 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 Timebase can be generated from the following sources: •...

  • Page 77: Specifications

    Performance dependent on type of installed C Series I/O modules and number of channels in the task. Does not include group delay. Refer to C Series I/O module documentation for more information. © National Instruments Corporation Maximum... 3.2 MS/s Minimum ... 0 S/s ...

  • Page 78: Digital Waveform Characteristics (Slots 1 Through 4 Only)

    AO waveform modes...Non-periodic waveform, Digital Waveform Characteristics (Slots 1 through 4 Only) Waveform acquisition (DI) FIFO...2,047 samples Waveform generation (DO) FIFO...2,047 samples Digital input sample clock frequency Digital output sample clock frequency Digital output or digital input sample clock source...Any PFI, analog sample or PFI Characteristics (Slots 5 and 6 Only) Functionality ...Static digital input, static digital Timing output sources ...Many analog input, analog...

  • Page 79: General-Purpose Counter/Timers (Slots 5 And 6 Only)

    Routing options for inputs... Any PFI, analog trigger, FIFO ... 2 samples Data transfers ... High-speed data stream, Requires correlated digital I/O modules installed in the appropriate slot(s). © National Instruments Corporation 125 ns, 6.425 µs, 2.56 ms, disable, high and low transitions semi-period, period, two-edge separation with Channel Z reloading;...

  • Page 80: Frequency Generator (Slots 5 And 6 Only)

    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...50 ppm Output is available on any PFI terminal. External Digital Triggers (Slots 5 and 6 or with Some AI Modules) Source ...Any PFI terminal Polarity...Software-selectable for most Analog input function ...Start Trigger, Reference Trigger,...

  • Page 81: Bus Interface

    , search by model number or product line, and click the appropriate link certification in the Certification column. © National Instruments Corporation 4.10 to 5.25 V ... 500 µA maximum Types available ... Analog input, analog output, IEC 61010-1, EN-61010-1 UL 61010-1, CSA 61010-1 threaded ring 0.8 in.

  • Page 82: Environmental

    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 (IEC-60068-2-1 and IEC-60068-2-2) ...–20 to 55 °C Storage temperature (IEC-60068-2-1 and IEC-60068-2-2) ...–40 to 85 °C Ingress protection ...IP 30 Operating humidity (IEC-60068-2-56) ...10 to 90% RH, noncondensing...

  • Page 83: Electromagnetic Compatibility

    Waste Electrical and Electronic Equipment (WEEE) At the end of their life cycle, all products must be sent to a WEEE recycling EU Customers center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit National Instruments...

  • Page 84: Where To Go For Support

    Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or ni.com/patents.

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