National Instruments DAQ Analog Output Series User Manual
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National Instruments DAQ Analog Output Series User Manual

National Instruments DAQ Analog Output Series User Manual

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  • Page 1 PXI-6733...
  • Page 2 DAQ Analog Output Series Analog Output Series User Manual NI 6711/6713/DAQCard-6715, NI 6722/6723, and NI 6731/6733 Devices Analog Output Series User Manual January 2017 370735F-01...
  • Page 3 11500 North Mopac Expressway Austin, Texas 78759-3504 USA Tel: 512 683 0100 NI Services For further support information, refer to the appendix. To comment on NI documentation, refer to the NI website at and enter the Info Code ni.com/info feedback © 2003–2017 National Instruments. All rights reserved.
  • Page 4 National Instruments Corporation. National Instruments respects the intellectual property of others, and we ask our users to do the same. NI software is protected by copyright and other intellectual property laws. Where NI software may be used to reproduce software or other materials belonging to others, you may use NI software only to reproduce materials that you may reproduce in accordance with the terms of any applicable license or other legal restriction.
  • Page 5 ™ The ExpressCard word mark and logos are owned by PCMCIA and any use of such marks by National Instruments is under license. The mark LabWindows is used under a license from Microsoft Corporation. Windows is a registered trademark of Microsoft Corporation in the United States and other countries.
  • Page 6 Operation of this hardware in a residential area is likely to cause harmful interference. Users are required to correct the interference at their own expense or cease operation of the hardware. Changes or modifications not expressly approved by National Instruments could void the user’s right to operate the hardware under the local regulatory rules.

  • Page 7: Table Of Contents

    Reglitch Selection (NI 6711/6713 Only)..............3-2 Minimizing Glitches on the Output Signal............... 3-3 AO Data Generation Methods .................. 3-3 Software-Timed Generations................3-3 Hardware-Timed Generations ................3-3 Analog Output Triggering ....................3-4 Connecting Analog Output Signals .................. 3-5 © National Instruments | vii...
  • Page 8 Contents Waveform Generation Timing Signals ................3-5 Waveform Generation Timing Summary ..............3-5 AO Start Trigger Signal .................... 3-5 Using a Digital Source ..................3-6 Outputting the AO Start Trigger Signal............3-6 AO Pause Trigger Signal ..................3-6 Using a Digital Source ..................3-7 AO Sample Clock Signal ..................
  • Page 9 Data Transfer Methods ..................... 9-2 Direct Memory Access (DMA) ................9-2 Interrupt Request (IRQ).................... 9-2 Programmed I/O ....................... 9-2 Changing Data Transfer Methods between DMA and IRQ ......................... 9-2 Chapter 10 Triggering Triggering with a Digital Source ..................10-1 © National Instruments | ix...
  • Page 10 Contents Appendix A Device-Specific Information Appendix B Troubleshooting Appendix C NI Services Glossary Index x | ni.com...

  • Page 11: Daq System Overview

    Refer to the section for a list of devices and their compatible accessories. Figure 1-1. DAQ System Setup – – – – Sensors and Transducers DAQ Device Terminal Block Accessory Personal Computer Cable Assembly © National Instruments | 1-1...

  • Page 12: Safety Guidelines

    Misuse of the device can result in a hazard. You can compromise the safety protection built into the device if the device is damaged in any way. If the device is damaged, contact National Instruments for repair.

  • Page 13: Daq Hardware

    Routing Counters RTSI DAQ-STC Analog output devices use the National Instruments DAQ system timing controller (DAQ-STC) for time-related functions. The DAQ-STC consists of the following three timing groups: • AI—two 24-bit, two 16-bit counters (not used on AO Series devices) •...

  • Page 14: Calibration Circuitry

    The accuracy specifications of your device change depending on how long it has been since your last external calibration. National Instruments recommends that you calibrate your device at least as often as the intervals listed in the accuracy specifications.

  • Page 15: Using Accessories With Devices

    TBX-68 TB-2705 (PXI only) NI DAQCard-6715 SHC68-68-EPM BNC-2110 (Recommended, Shielded) CA1000 CB-68LP SHC68U-68-EP (Shielded) CB-68LPR SCB-68A RC68-68 (Unshielded) SCB-68 TBX-68 NI 6722 SH68-C68-S BNC-2110 (Recommended, Shielded) CA1000 CB-68LP RC68-68 (Low Cost) CB-68LPR SCB-68A SCB-68 TBX-68 © National Instruments | 1-5...
  • Page 16 Chapter 1 DAQ System Overview Table 1-1. Accessories and Cables for Analog Output Devices (Continued) Accessories Device Cables Terminal Blocks NI 6723 SH68-C68-S BNC-2110 (AO 0–7 & DIGITAL connector) (Recommended, Shielded) CA1000 CB-68LP RC68-68 CB-68LPR (Low Cost) SCB-68A SBC-68 TBX-68 NI 6723 (AO 8–31 connector) SH68-C68-S BNC-2115...

  • Page 17: Custom Cabling

    Refer to the NI Developer Zone document, Field Wiring and Noise Considerations for Analog Signals, for more information. To access this document, go to and enter the Info ni.com/info Code rdfwin © National Instruments | 1-7...

  • Page 18: Programming Devices In Software

    DAQ System Overview Programming Devices in Software National Instruments measurement devices are packaged with NI-DAQmx driver software, an extensive library of functions and VIs you can call from your application software, such as LabVIEW or LabWindows/CVI, to program all the features of your NI measurement devices.

  • Page 19: I/O Connector

    If you are using an AO Series device in Traditional NI-DAQ (Legacy), refer to Table 2-1 for the Traditional NI-DAQ (Legacy) signal names. 68-Pin AO I/O Connector Pinouts Figure 2-1, Figure 2-2, and Figure 2-3 show the pinouts of 68-pin AO Series devices. © National Instruments | 2-1...
  • Page 20 Chapter 2 I/O Connector Figure 2-1. NI 6711/6731 68-Pin AO I/O Connector Pinout 34 68 AO GND 33 67 AO GND 32 66 AO GND AO GND 31 65 AO GND 30 64 AO GND 29 63 AO GND AO GND 28 62 27 61 AO GND...
  • Page 21 PFI 5/AO SAMP CLK CTR 1 OUT PFI 6/AO START TRIG D GND D GND PFI 7 PFI 9/CTR 0 GATE PFI 8/CTR 0 SOURCE CTR 0 OUT D GND FREQ OUT D GND NC = No Connect © National Instruments | 2-3...
  • Page 22 Chapter 2 I/O Connector Figure 2-3. NI 6722 68-Pin AO I/O Connector Pinout AO GND AO GND AO GND AO GND AO GND AO 7 AO 6 AO GND AO GND AO GND AO 5 AO GND AO GND AO GND AO 4 AO 3 AO GND...

  • Page 23: 68-68-Pin Extended Ao I/O Connector Pinout

    For a detailed description of each signal, refer to Terminal Name Equivalents With NI-DAQmx, National Instruments has revised its terminal names so they are easier to understand and more consistent among National Instruments hardware and software products. The revised terminal names used in this document are usually similar to the names they replace.
  • Page 24 Chapter 2 I/O Connector Table 2-1. Terminal Name Equivalents. Traditional NI-DAQ (Legacy) NI-DAQmx ACH# AI # ACH# + AI # + ACH# - AI # - ACHGND AI GND AIGND AI GND AISENSE AI SENSE AISENSE2 AI SENSE 2 AOGND AO GND CONVERT* AI CONV CLK or AI CONV...

  • Page 25: I/O Connector Signal Descriptions

    +5 VDC supply. Digital I/O signals—These pins drive and P0.<0..7> D GND Input or Output receive digital signals. P0.6 and P0.7 can control the up/down signal of Counters 0 and 1, respectively. © National Instruments | 2-7...
  • Page 26 Chapter 2 I/O Connector Table 2-2. I/O Connector Signal Descriptions (Continued) I/O Connector Reference Direction Signal Description +5 VDC source—These pins provide +5 V D GND Output +5 V power. External Reference—This pin is the AO EXT REF D GND Input external reference input for the AO circuitry.
  • Page 27 RTSI bus. This is the default input for the Ctr0Source signal. Counter 0 Source Signal—As an output, Output this pin emits the Ctr0Source signal. This signal reflects the actual source signal connected to Counter 0. For more information, refer to Chapter 5, Counters. © National Instruments | 2-9...

  • Page 28: +5 V Power Source

    Chapter 2 I/O Connector Table 2-2. I/O Connector Signal Descriptions (Continued) I/O Connector Reference Direction Signal Description PFI 9—As an input, this pin is a PFI 9/CTR 0 D GND Input GATE general-purpose input terminal and can also be used to route signals directly to the RTSI bus.
  • Page 29 Never connect these +5 V power pins to analog or digital ground or to any other voltage source on the AO Series device or any other device. Doing so can damage the device and the computer. NI is not liable for damage resulting from such a connection. © National Instruments | 2-11...

  • Page 30: Analog Output

    AO voltage. For more information on the AO Sample Clock signal, refer to the Waveform Generation Timing Signals section. Reference Selection (NI 6711/6713/DAQCard-6715 and NI 6731/6733 Only) Reference selection allows you to set the AO range. Refer to Table 3-1 to set the range for your device. © National Instruments | 3-1...

  • Page 31: Analog Output Resolution

    Chapter 3 Analog Output Table 3-1. AO Reference Selection Options AO Range Polarity Reference Select ±10 V Bipolar Internal ±EXT REF Bipolar AO External Reference Signal Analog Output Resolution You can calculate the least significant bit (LSB), or the minimal allowed voltage change, on a voltage output on your AO Series device as follows: resolution of your device LSB = output voltage range/2...

  • Page 32: Minimizing Glitches On The Output Signal

    For more information on DMA and Data Transfer Methods Interface. interrupt requests, refer to the section of Chapter 9, One property of buffered I/O operations is the sample mode. The sample mode can be either finite or continuous. © National Instruments | 3-3...

  • Page 33: Analog Output Triggering

    Chapter 3 Analog Output Finite sample mode generation refers to the generation of a specific, predetermined number of data samples. After the specified number of samples has been written out, the generation stops. Continuous generation refers to the generation of an unspecified number of samples. Instead of generating a set number of data samples and stopping, a continuous generation continues until you stop the operation.

  • Page 34: Connecting Analog Output Signals

    20 MHz Divisor Timebase AO Start Trigger Signal You can use the AO Start Trigger (ao/StartTrigger) signal to initiate a waveform generation. If you do not use triggers, you begin a generation with a software command. © National Instruments | 3-5...

  • Page 35: Using A Digital Source

    Chapter 3 Analog Output Using a Digital Source To use ao/StartTrigger, specify a source and an edge. The source can be an external signal connected to any PFI or RTSI <0..6> pin. The source can also be one of several internal signal on your DAQ device.

  • Page 36: Using A Digital Source

    You can use a signal connected to any PFI or RTSI <0..6> pin as the source of ao/SampleClock. Figure 3-6 shows the timing requirements of the ao/SampleClock source. Figure 3-6. ao/SampleClock Timing Requirements Rising-Edge Polarity Falling-Edge Polarity = 10 ns minimum © National Instruments | 3-7...

  • Page 37: Outputting The Ao Sample Clock Signal

    Chapter 3 Analog Output Outputting the AO Sample Clock Signal You can configure the PFI 5/AO SAMP CLK pin to output the ao/SampleClock signal. The output pin reflects the ao/SampleClock signal regardless of what signal you specify as its source. The output is an active high pulse.

  • Page 38: Ao Sample Clock Timebase Signal

    MasterTimebase unless you wish to synchronize multiple devices, in which case, you should use Real-Time System Integration Bus (RTSI), for more information on RTSI 7. Refer to Chapter 8, which signals are available through RTSI. © National Instruments | 3-9...

  • Page 39: Getting Started With Ao Applications In Software

    Chapter 3 Analog Output Figure 3-10 shows the timing requirements for MasterTimebase. Figure 3-10. MasterTimebase Timing Requirements = 50 ns minimum = 23 ns minimum Getting Started with AO Applications in Software You can use the AO Series device in the following analog output applications. •...

  • Page 40: Digital I/O

    DI Sample Clock The DIO terminals are named P0.<0..7> on the I/O connector. The voltage input and output levels and the current drive levels of the DIO lines are listed in the specifications of your device. © National Instruments | 4-1...

  • Page 41: Static Dio

    Chapter 4 Digital I/O Static DIO Each DIO line can be used as a static DI or DO line. You can use static DIO lines to monitor or control digital signals. Each DIO can be individually configured as a digital input (DI) or digital output (DO).

  • Page 42: Using An Internal Source

    Direct Memory Access (DMA) For more information on DMA transfers, refer to the section of Interface. Chapter 9, You can configure each DIO line to be an output, a static input, or a digital waveform acquisition input. © National Instruments | 4-3...

  • Page 43: Di Sample Clock Signal (Ni 6731/6733 Only)

    Chapter 4 Digital I/O DI Sample Clock Signal (NI 6731/6733 Only) Use the DI Sample Clock (di/SampleClock) signal to sample the P0.<0..7> terminals and store the result in the DI waveform acquisition FIFO. Because there is no dedicated internal clock for timed digital operations, you can use an external signal or one of several internal signals as the DI Sample Clock.

  • Page 44: Power-On States

    TTL signals and driving external devices, such as the LED shown in the figure. Figure 4-2. Digital I/O Signal Connections +5 V P0.<4..7> TTL Signal P0.<0..3> +5 V Switch D GND I/O Connector AO Series Device © National Instruments | 4-5...

  • Page 45: Getting Started With Dio Applications In Software

    Chapter 4 Digital I/O Caution Exceeding the maximum input voltage ratings, which are listed in the specifications of each AO Series device, can damage the DAQ device and the computer. NI is not liable for any damage resulting from such signal connections. Getting Started with DIO Applications in Software You can use the AO Series device in the following digital I/O applications.

  • Page 46: Counters

    For continuous pulse generations, the counter stops generating pulses while the external trigger signal is low and resumes when the signal goes high or vice versa. © National Instruments | 5-1...

  • Page 47: Counter Timing Signals

    Chapter 5 Counters Counter Timing Signals The following sections contain information on counter timing signals. Counter Timing Summary Figure 5-2 shows the timing requirements for the gate and source input signals and the timing specifications for the output signals on your device. Figure 5-2.

  • Page 48: Counter 0 Source Signal

    You can export the gate signal connected to Counter 0 to the PFI 9/CTR 0 GATE pin, even if another PFI is inputting the Ctr0Gate signal. This output is set to high-impedance at startup. © National Instruments | 5-3...

  • Page 49: Counter 0 Internal Output Signal

    Chapter 5 Counters Figure 5-4 shows the timing requirements for the Ctr0Gate signal. Figure 5-4. Ctr0Gate Timing Requirements Rising-Edge Polarity Falling-Edge Polarity = 10 ns minimum Counter 0 Internal Output Signal The Counter 0 Internal Output (Ctr0InternalOutput) signal is the output of Counter 0. This signal reflects the terminal count (TC) of Counter 0.

  • Page 50: Ctr 0 Out Pin

    You can export the Counter 1 signal to the PFI 3/CTR 1 SOURCE pin, even if another PFI is inputting the Ctr1Source signal. This output is set to high-impedance at startup. © National Instruments | 5-5...

  • Page 51: Counter 1 Gate Signal

    Chapter 5 Counters Figure 5-7 shows the timing requirements for the Ctr1Source signal. Figure 5-7. Ctr1Source Timing Requirements t p = 50 ns minimum t w = 10 ns minimum The maximum allowed frequency is 20 MHz, with a minimum pulse width of 10 ns high or low. There is no minimum frequency.

  • Page 52: Counter 1 Internal Output Signal

    16. The input clock of the frequency generator is software-selectable from the internal 10 MHz and 100 kHz timebases. The output polarity is software-selectable. This output is set to high-impedance at startup. © National Instruments | 5-7...

  • Page 53: Master Timebase Signal

    Chapter 5 Counters Master Timebase Signal The Master Timebase (MasterTimebase) signal, or Onboard Clock, is the timebase from which all other internally generated clocks and timebases on the board are derived. It controls the timing for the analog output and counter subsystems. It is available as on output on the I/O connector, but you must use one or more counters to do so.

  • Page 54: Programmable Function Interfaces (Pfi)

    Counter 0 Source signal as an output on the I/O connector, software can turn on the output driver for the PFI 8/CTR 0 SRC pin. This signal, however, cannot be output on any other PFI pin. © National Instruments | 6-1...
  • Page 55 Chapter 6 Programmable Function Interfaces (PFI) Not all timing signals can be output. PFI pins are labeled with the timing signal that can be output on it. For example, PFI 8 is labeled PFI 8/CTR 0 Source. The following timing signals can be output on PFI pins.

  • Page 56: Digital Routing

    AO Sample Clock Timebase Signal • DI Sample Clock Signal • DO Sample Clock Signal • Counter 0 Source Signal • Counter 0 Gate Signal • Counter 0 Up/Down Signal • Counter 1 Source Signal © National Instruments | 7-1...
  • Page 57 Chapter 7 Digital Routing • Counter 1 Gate Signal • Counter 1 Up/Down Signal • Master Timebase Signal You also can control these timing signals with signals generated internally to the DAQ-STC, and these selections are fully software-configurable. For example, the signal routing multiplexer for controlling the ao/SampleClock signal is shown in Figure 7-1.

  • Page 58: Connecting Timing Signals

    PFI 0 source and an external PFI 2 source to two PFI pins. Figure 7-2. Connecting PFI 0 and PFI 2 to Two PFI Pins PFI 0 PFI 2 PFI 0 PFI 2 Source Source D GND I/O Connector AO Series Device © National Instruments | 7-3...

  • Page 59: Routing Signals In Software

    Chapter 7 Digital Routing Routing Signals in Software Table 7-1 lists the basic functions you can use to route signals. Table 7-1. Signal Routing in Software Language Function LabVIEW DAQmx Export Signal.vi DAQmx Connect Terminals.vi Export_Signal DAQmx_Connect_Terminals Note For more information about routing signals in software, refer to the NI-DAQmx Help.

  • Page 60: Real-Time System Integration Bus (Rtsi)

    Slot 2 of the chassis. AO Series devices can accept timing signals from the PXI star trigger line, but they cannot drive signals onto it. For more information on the star trigger, refer to the PXI Hardware Specification Revision 2.1. © National Instruments | 8-1...
  • Page 61 Chapter 8 Real-Time System Integration Bus (RTSI) Figure 8-1 shows the PCI RTSI bus signal connection. Figure 8-1. PCI RTSI Bus Signal Connection DAQ-STC ao/SampleClock ao/StartTrigger ao/PauseTrigger Ctr0 Source Ctr0Gate Trigger <0..6> Ctr0InternalOutput Ctr0Out ao/SampleClockTimebase Ctr1Source Ctr1Gate RTSI Trigger 7 20MHzTimebase Switch MasterTimebase...

  • Page 62: Device And Rtsi Clocks

    RTSI trigger line from the master device. When you start all of the slave devices before starting the master device, you have successfully synchronized your application across multiple devices. © National Instruments | 8-3...

  • Page 63: Bus Interface

    Damage can result if these lines are driven by the sub-bus. NI is not liable Caution for any damage resulting from improper signal connections. © National Instruments | 9-1...

  • Page 64: Data Transfer Methods

    CPU. This method makes DMA the fastest available data transfer method. National Instruments uses DMA hardware and software technology to achieve high throughput rates and to increase system utilization. DMA is the default method of data transfer for DAQ devices that support it.

  • Page 65: Triggering

    The action can affect: • analog output generation • counter behavior Analog Output Triggering Analog For more information, refer to the section of Chapter 3, Output, and the Counter Triggering section of Chapter 5, Counters. © National Instruments | 10-1...

  • Page 66: Device-Specific Information

    The NI 6711 has four channels of voltage output at the I/O connector, and the NI 6713 has eight channels of voltage output at the I/O connector. The reference for the AO circuitry is software-selectable per channel. The reference can be either internal or external, but the range is © National Instruments | A-1...
  • Page 67 Appendix A Device-Specific Information always bipolar. This means that you can generate signals up to ±10 V with internal reference selected or ±EXT REF voltage with external reference selected. Block Diagram (NI 6711/6713) Figure A-1 shows a block diagram of the NI 6711/6713. Figure A-1.
  • Page 68 AO circuitry is software-selectable per channel. The reference can be either internal or external, but the range is always bipolar. This means that you can generate signals up to ±10 V with internal reference selected or ±EXT REF voltage with external reference selected. © National Instruments | A-3...
  • Page 69 Appendix A Device-Specific Information Block Diagram (NI DAQCard-6715) Figure A-2 shows a block diagram of the NI DAQCard-6715. Figure A-2. NI DAQCard-6715 Block Diagram AO 0 AO 0 12-Bit DAC AO 1 AO 1 12-Bit DAC AO 2 AO 2 12-Bit DAC AO 3 AO 3...
  • Page 70 I/O connectors. The reference for the AO circuitry is internal. Each NI 6722/6723 voltage output channel has a bipolar range of ±10 V from AO GND. You cannot select an external reference to adjust the AO voltage range. © National Instruments | A-5...
  • Page 71 Appendix A Device-Specific Information Block Diagram (NI 6722/6723) Figure A-3 shows a block diagram of the NI 6722/6723. Figure A-3. NI 6722/6723 Block Diagram Load DAC 13-Bit DAC 13-Bit DAC 13-Bit DAC 13-Bit DAC 13-Bit DAC EEPROM 13-Bit DAC Control 13-Bit DAC Power On MITE...
  • Page 72 The reference can be either internal or external, but the range is always bipolar. This means that you can generate signals up to ±10 V with internal reference selected or ±EXT REF voltage with external reference selected. © National Instruments | A-7...
  • Page 73 Appendix A Device-Specific Information Block Diagram (NI 6731/6733) Figure A-4 shows a block diagram of the NI 6731/6733. Figure A-4. NI 6731/6733 Block Diagram AO 0 AO 0 AO 0 Latch 16-Bit DAC AO 1 AO 1 AO 1 Latch 16-Bit DAC AO 2 AO 2...

  • Page 74: Appendix B Troubleshooting

    99.50 kHz ------------------- In this case, f equals 1.99 kHz, according to the following equation: 99.50 kHz 1.99 kHz ------------------------ - The smallest frequency change that you can generate in this case is approximately 10 Hz. © National Instruments | B-1...
  • Page 75 Appendix B Troubleshooting Power-On States of the Analog Output Lines I have some motors connected directly into the outputs of my NI 6713, and when I power on my computer they start running very slowly. I am reading an offset of 100 to 110 mV. If I open the test panels in Measurement &...

  • Page 76: Ni Services

    System Integration—If you have time constraints, limited in-house technical resources, or • other project challenges, National Instruments Alliance Partner members can help. To learn more, call your local NI office or visit ni.com/alliance © National Instruments | C-1...
  • Page 77 Appendix C NI Services Training and Certification—The NI training and certification program is the most • effective way to increase application development proficiency and productivity. Visit for more information. ni.com/training – The Skills Guide assists you in identifying the proficiency requirements of your current application and gives you options for obtaining those skills consistent with your time and budget constraints and personal learning preferences.

  • Page 78: Glossary

    Analog-to-digital converter—an electronic device, often an integrated circuit, that converts an analog voltage to a digital number. 1. Analog input 2. Analog input channel signal. AI HOLD COMP Analog input hold complete signal. Analog output. © National Instruments | G-1...
  • Page 79 Glossary AO 0 Analog channel 0 output signal. AO 1 Analog channel 1 output signal. AO GND Analog output ground signal. ASIC Application-Specific Integrated Circuit—a proprietary semiconductor component designed and manufactured to perform a set of specific functions. bipolar A signal range that includes both positive and negative values (for example, -5 to +5 V) Celsius channel...
  • Page 80 1. An instrument or controller you can access as a single entity that controls or monitors real-world I/O points. A device often is connected to a host computer through some type of communication network. 2. See also DAQ device measurement device. Digital input/output. © National Instruments | G-3...
  • Page 81 Glossary Direct memory access—a method by which data can be transferred to/from computer memory from/to a device or memory on the bus while the processor does something else. DMA is the fastest method of transferring data to/from computer memory. Differential nonlinearity—a measure in least significant bit of the worst-case deviation of code widths from their ideal value of 1 LSB.
  • Page 82 VIs and functions you can call from an application development environment (ADE), such as LabVIEW, to program all the features of an NI measurement device, such as configuring, acquiring and generating data from, and sending data to the device. © National Instruments | G-5...
  • Page 83 Glossary NI-DAQmx The latest NI-DAQ driver with new VIs, functions, and development tools for controlling measurement devices. The advantages of NI-DAQmx over earlier versions of NI-DAQ include the DAQ Assistant for configuring channels and measurement tasks for your device for use in LabVIEW, LabWindows/CVI, and Measurement Studio;...
  • Page 84 Also called a grounded measurement system. RTSI Real-Time System Integration—the National Instruments timing bus that connects DAQ devices directly, by means of connectors on top of the devices, for precise synchronization of functions.
  • Page 85 Glossary task NI-DAQmx—a collection of one or more channels, timing, and triggering and other properties that apply to the task itself. Conceptually, a task represents a measurement or generation you want to perform. terminal count The highest value of a counter. Gate hold time.
  • Page 86 2. A LabVIEW software module (VI), which consists of a front panel user interface and a block diagram program. Volts, input high. Volts, input low. Volts in. Volts, output high. Volts, output low. Volts, root mean square. See channel. virtual channel © National Instruments | G-9...

  • Page 87: Index

    NI DAQCard-6715, A-3 counter applications, 5-8 frequency resolution, B-1 counter timing signals Counter 0 Gate, 5-3 Counter 0 Internal Output, 5-4 glitches on the output signal, minimizing, 3-3 Counter 0 Source, 5-3 Counter 0 Up/Down, 5-5 © National Instruments | I-1...
  • Page 88 Index NI 6711 (figure), 2-2 NI 6713 (figure), 2-3 I/O connector NI 6722 (figure), 2-4 68-68-pin extended AO, 2-5 NI 6723 (68-68-pin extended I/O), 2-5 68-pin AO, 2-1 NI 6723 (68-pin AO) (figure), 2-4 NI 6711 (figure), 2-2 NI 6731 (figure), 2-2 NI 6713 (figure), 2-3 NI 6733 (figure), 2-3 NI 6722 (figure), 2-4...
  • Page 89 B-2 update rate, B-2 waveform generation timing signals AO Pause Trigger, 3-6 AO Sample Clock, 3-7 AO Sample Clock Timebase, 3-9 AO Start Trigger, 3-5 Master Timebase, 3-9 waveform generation timing summary, 3-5 © National Instruments | I-3...

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