NI 6722 User manual

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

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Electromagnetic Compatibility Information

This hardware has been tested and found to comply with the applicable regulatory requirements and limits

for electromagnetic compatibility (EMC) as indicated in the hardware’s Declaration of Conformity (DoC)

1

.

These requirements and limits are designed to provide reasonable protection against harmful interference

when the hardware is operated in the intended electromagnetic environment. In special cases, for example

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1

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• Reorient the antenna of the receiver (the device suffering interference).

• Relocate the transmitter (the device generating interference) with respect to the receiver.

• Plug the transmitter into a different outlet so that the transmitter and the receiver are on different branch

circuits.

Some hardware may require the use of a metal, shielded enclosure (windowless version) to meet the EMC

requirements for special EMC environments such as, for marine use or in heavy industrial areas. Refer to

the hardware’s user documentation and the DoC

1

for product installation requirements.

When the hardware is connected to a test object or to test leads, the system may become more sensitive to

disturbances or may cause interference in the local electromagnetic environment.

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.

1

The Declaration of Conformity (DoC) contains important EMC compliance information and instructions

for the user or installer. To obtain the DoC for this product, visit

ni.com/certification, search by

model number or product line, and click the appropriate link in the Certification column.

Contents

Chapter 1

DAQ System Overview

Safety Guidelines.............................................................................................................. 1-2

Electromagnetic Compatibility Guidelines ...................................................................... 1-2

DAQ Hardware................................................................................................................. 1-3

DAQ-STC................................................................................................................. 1-3

Calibration Circuitry................................................................................................. 1-4

Internal or Self-Calibration............................................................................... 1-4

External Calibration.......................................................................................... 1-4

Cables and Accessories .................................................................................................... 1-4

Using Accessories with Devices............................................................................... 1-5

Custom Cabling ........................................................................................................ 1-7

Field Wiring Considerations..................................................................................... 1-7

Programming Devices in Software................................................................................... 1-8

Chapter 2

I/O Connector

68-Pin AO I/O Connector Pinouts.................................................................................... 2-1

68-68-Pin Extended AO I/O Connector Pinout................................................................ 2-5

Terminal Name Equivalents ............................................................................................. 2-5

I/O Connector Signal Descriptions................................................................................... 2-7

+5 V Power Source........................................................................................................... 2-10

Chapter 3

Analog Output

Analog Output Fundamentals........................................................................................... 3-1

Analog Output Circuitry........................................................................................... 3-1

DACs ................................................................................................................ 3-1

DAC FIFO ........................................................................................................ 3-1

AO Sample Clock ............................................................................................. 3-1

Reference Selection .......................................................................................... 3-1

Analog Output Resolution........................................................................................ 3-2

Reference Selection (NI 6711/6713/DAQCard-6715 and NI 6731/6733 Only) ...... 3-2

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

Contents

viii | ni.com

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 .......................................................................................... 3-7

Using an Internal Source................................................................................... 3-7

Using an External Source .................................................................................3-7

Outputting the AO Sample Clock Signal..........................................................3-8

Other Timing Requirements ............................................................................. 3-8

AO Sample Clock Timebase Signal .........................................................................3-9

Master Timebase Signal............................................................................................ 3-9

Getting Started with AO Applications in Software .......................................................... 3-10

Chapter 4

Digital I/O

Static DIO ......................................................................................................................... 4-2

Digital Waveform Generation

(NI 6731/6733 Only) .....................................................................................................4-2

DO Sample Clock Signal (NI 6731/6733 Only).......................................................4-2

Using an Internal Source................................................................................... 4-3

Using an External Source .................................................................................4-3

Digital Waveform Acquisition

(NI 6731/6733 Only) .....................................................................................................4-3

DI Sample Clock Signal (NI 6731/6733 Only) ........................................................ 4-4

Using an Internal Source................................................................................... 4-4

Using an External Source .................................................................................4-4

I/O Protection.................................................................................................................... 4-4

Power-On States ...............................................................................................................4-5

Connecting Digital I/O Signals......................................................................................... 4-5

Getting Started with DIO Applications in Software.........................................................4-6

Chapter 5

Counters

Counter Triggering ...........................................................................................................5-1

Start Trigger .............................................................................................................. 5-1

Pause Trigger ............................................................................................................ 5-1

Counter Timing Signals .................................................................................................... 5-2

Counter Timing Summary ........................................................................................5-2

Counter 0 Source Signal ........................................................................................... 5-3

Counter 0 Gate Signal............................................................................................... 5-3

Analog Output Series User Manual

Counter 0 Internal Output Signal.............................................................................. 5-4

CTR 0 OUT Pin ................................................................................................ 5-5

Counter 0 Up/Down Signal ...................................................................................... 5-5

Counter 1 Source Signal ........................................................................................... 5-5

Counter 1 Gate Signal............................................................................................... 5-6

Counter 1 Internal Output Signal.............................................................................. 5-7

Counter 1 Up/Down Signal ...................................................................................... 5-7

Frequency Output Signal .......................................................................................... 5-7

Master Timebase Signal ........................................................................................... 5-8

Getting Started with Counter Applications in Software................................................... 5-8

Chapter 6

Programmable Function Interfaces (PFI)

Inputs ................................................................................................................................ 6-1

Outputs.............................................................................................................................. 6-1

Chapter 7

Digital Routing

Timing Signal Routing ..................................................................................................... 7-1

Connecting Timing Signals .............................................................................................. 7-3

Routing Signals in Software ............................................................................................. 7-4

Chapter 8

Real-Time System Integration Bus (RTSI)

RTSI Triggers ...................................................................................................................8-1

Device and RTSI Clocks .................................................................................................. 8-3

Synchronizing Multiple Devices ...................................................................................... 8-3

Chapter 9

Bus Interface

MITE and DAQ-PnP ........................................................................................................ 9-1

Using PXI with CompactPCI ........................................................................................... 9-1

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

Contents

x | ni.com

Appendix A

Device-Specific Information

Appendix B

Troubleshooting

Appendix C

NI Services

Glossary

Index

1

DAQ System Overview

Figure 1-1 shows a typical DAQ system setup, which includes transducers, signal conditioning,

cables that connect the various devices to the accessories, the analog output device, and the

programming software. Refer to the Using Accessories with Devices section for a list of devices

and their compatible accessories.

Figure 1-1. DAQ System Setup

1 Sensors and Transducers

2 Terminal Block Accessory

3 Cable Assembly

4DAQ Device

5 Personal Computer

2

4

3

5

1

+

V

–

+

HV

–

+

mV

–

+

–

1-2 | ni.com

Chapter 1 DAQ System Overview

Safety Guidelines

Operate the device only as described in this document.

Caution This icon denotes a caution, which advises you of precautions to take to

avoid injury, data loss, or a system crash.

Caution The protection provided by the device can be impaired if it is used in a

manner not described in this document. 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.

Caution Do not substitute parts or modify the device except as described in this

document. Use the device only with the chassis, modules, accessories, and cables

specified in the installation instructions.

Caution You must have all covers and filler panels installed during operation of the

device. Do not operate the device without verifying that the cover is correctly

attached and the device is completely closed.

Electromagnetic Compatibility Guidelines

This product was tested and complies with the regulatory requirements and limits for

electromagnetic compatibility (EMC) stated in the product specifications. These requirements

and limits provide reasonable protection against harmful interference when the product is

operated in the intended operational electromagnetic environment.

This product is intended for use in industrial locations. However, harmful interference may

occur in some installations, when the product is connected to a peripheral device or test object,

or if the product is used in residential or commercial areas. To minimize interference with radio

and television reception and prevent unacceptable performance degradation, install and use this

product in strict accordance with the instructions in the product documentation.

Furthermore, any modifications to the product not expressly approved by National Instruments

could void your authority to operate it under your local regulatory rules.

Caution To ensure the specified EMC performance, operate this product only with

shielded cables and accessories. Do not use unshielded cables or accessories unless

they are installed in a shielded enclosure with properly designed and shielded

input/output ports and connected to the product using a shielded cable. If unshielded

cables or accessories are not properly installed and shielded, the EMC specifications

for the product are no longer guaranteed.

Analog Output Series User Manual

Caution To ensure the specified EMC performance of the DAQCard-6715, the

length of the I/O cable must be no longer than 3 m (10 ft). For all other products, the

length of the I/O cable must be no longer than 30 m (100 ft).

DAQ Hardware

DAQ hardware digitizes signals, performs D/A conversions to generate analog output signals,

and measures and controls digital I/O signals. Figure 1-2 shows the components common to all

AO Series devices. The following sections contain more information about specific components

of the DAQ hardware.

Figure 1-2. Analog Output Block Diagram

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)

• AO—three 24-bit, one 16-bit counter

• General-purpose counter/timer functions—two 24-bit counters

You can independently configure the groups for timing resolutions of 50 ns or 10 µs. With the

DAQ-STC, you can interconnect a wide variety of internal timing signals to other internal

blocks. The interconnection scheme is flexible and completely software-configurable.

The DAQ-STC offers PFI lines to import external timing and trigger signals or to export

internally generated clocks and triggers. The DAQ-STC also supports buffered operations, such

as buffered waveform acquisition, buffered waveform generation, and buffered period

measurement. It also supports numerous non-buffered operations, such as single pulse or pulse

train generation, digital input, and digital output.

Analog Output

Digital I/O

Counters

PFI

Digital

Routing

RTSI

Bus

Interface

Bus

I/O Connector

1-4 | ni.com

Chapter 1 DAQ System Overview

Calibration Circuitry

Calibration is the process of making adjustments to a measurement device to reduce errors

associated with measurements. Without calibration, the measurement results of your device will

drift over time and temperature. Calibration adjusts for these changes to improve measurement

accuracy and ensure that your product meets its required specifications.

DAQ devices have high precision analog circuits that must be adjusted to obtain optimum

accuracy in your measurements. Calibration determines what adjustments these analog circuits

should make to the device measurements. During calibration, the value of a known, high

precision measurement source is compared to the value your device acquires or generates. The

adjustment values needed to minimize the difference between the known and measured values

are stored in the EEPROM of the device as calibration constants. Before performing a

measurement, these constants are read out of the EEPROM and are used to adjust the calibration

hardware on the device. NI-DAQ determines when this is necessary and does it automatically.

If you are not using NI-DAQ, you must load these values yourself.

You can calibrate AO Series devices in the following two ways.

Internal or Self-Calibration

Self-calibration is a process to adjust the device relative to a highly accurate and stable internal

reference on the device. Self-calibration is similar to the autocalibration or autozero found on

some instruments. You should perform a self-calibration whenever environmental conditions,

such as ambient temperature, change significantly. To perform self-calibration, use the

self-calibrate function or VI that is included with your driver software. Self-calibration requires

no external connections.

External Calibration

External calibration is a process to adjust the device relative to a traceable, high precision

calibration standard. 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.

For a detailed calibration procedure for AO Series devices, refer to the AO Waveform

Calibration Procedure for NI-DAQmx document by selecting Manual Calibration Procedures

at

ni.com/calibration.

Cables and Accessories

NI offers a variety of products to use with Analog Output Series devices, including:

• BNC accessories

• Connector blocks with screw terminals

• I/O connector cables

Analog Output Series User Manual

• RTSI bus cables

• Low channel-count digital signal conditioning modules, devices, and accessories

For more specific information about these products, refer to ni.com.

The following sections contain information on how to select accessories for your AO Series

device.

Using Accessories with Devices

Go to ni.com/info and enter the Info Code AOcables for the most current list of supported

cables and accessories for the following analog output devices.

Table 1-1. Accessories and Cables for Analog Output Devices

Device

Accessories

Cables Terminal Blocks

NI 6711/6713 SH68-68-EPM

(Recommended, Shielded)

R6868 (Low Cost)

BNC-2110

CA1000

CB-68LP

CB-68LPR

SCB-68

SCB-68A

TBX-68

TB-2705 (PXI only)

NI DAQCard-6715 SHC68-68-EPM

(Recommended, Shielded)

SHC68U-68-EP (Shielded)

RC68-68 (Unshielded)

BNC-2110

CA1000

CB-68LP

CB-68LPR

SCB-68A

SCB-68

TBX-68

NI 6722 SH68-C68-S

(Recommended, Shielded)

RC68-68 (Low Cost)

BNC-2110

CA1000

CB-68LP

CB-68LPR

SCB-68A

SCB-68

TBX-68

1-6 | ni.com

Chapter 1 DAQ System Overview

NI 6723

(AO 0–7 & DIGITAL connector)

SH68-C68-S

(Recommended, Shielded)

RC68-68

(Low Cost)

BNC-2110

CA1000

CB-68LP

CB-68LPR

SCB-68A

SBC-68

TBX-68

NI 6723 (AO 8–31 connector) SH68-C68-S

(Recommended, Shielded)

RC68-68

(Low Cost)

BNC-2115

CA-1000

CB-68LP

CB-68LPR

SCB-68A

SCB-68

TBX-68

NI 6731/6733 SH68-68-EPM

(Recommended)

R6868

(Low Cost)

BNC-2110

CA1000

CB-68LP

CB-68LPR

SCB-68

SCB-68A

TBX-68

TB-2705 (PXI only)

Table 1-2. Overview of DAQ Accessories for Analog Output Devices

Accessory Description

BNC-2110 BNC connector block for 68-pin analog output devices

BNC-2115 BNC connector block for extended I/O

CA-1000 Per-channel custom connectivity connector accessory enclosure

CB-68LP, CB-68LPR 68-pin, low-cost screw terminal block

SCB-68A, SCB-68 68-pin, shielded screw terminal block with breadboard areas.

The SCB-68A is a newer design recommended for all new

applications over the SCB-68.

TBX-68 68-pin, DIN rail-mountable screw terminal block

Table 1-1. Accessories and Cables for Analog Output Devices (Continued)

Device

Accessories

Cables Terminal Blocks

Analog Output Series User Manual

Custom Cabling

Follow these guidelines if you want to develop your own cable.

• Route the analog lines separately from the digital lines.

• When using a cable shield, use separate shields for the analog and digital halves of the

cable. Failure to do so results in noise coupling into the analog signals from transient digital

signals.

Table 1-3 shows the recommended connectors to use with the I/O connector on your AO device.

Note When the NI DAQCard-6715 is in the upper PCMCIA slot, you can maintain

access to the adjacent slot by using an inverted VHDCI connector.

For more information on the connectors used for DAQ devices, refer to the KnowledgeBase

document, Specifications and Manufacturers for Board Mating Connectors. To access this

document, go to ni.com/info and enter the info code rdsmbm.

Field Wiring Considerations

The following recommendations apply for all signal connections to the AO Series device.

• Separate the signal lines of the AO Series device from high-current or high-voltage lines.

These lines can induce currents in or voltages on the signal lines of the AO Series device if

they run in close parallel paths. To reduce the magnetic coupling between lines, separate

them by a reasonable distance if they run in parallel, or run the lines at right angles to each

other.

•Do not run signal lines through conduits that also contain power lines.

• Protect signal lines from magnetic fields caused by electric motors, welding equipment,

breakers, or transformers by running them through special metal conduits.

Refer to the NI Developer Zone document, Field Wiring and Noise Considerations for Analog

Signals, for more information. To access this document, go to

ni.com/info and enter the Info

Code rdfwin.

Table 1-3. Recommended AO Connectors

Device Connector

NI 6711/6713 Honda 68-position, solder cup, female connector Honda backshell

NI DAQCard-6715 AMP 68-position, VHDCI AMP backshell

NI 6722/6723 AMP 68-position, VHDCI AMP backshell

NI 6731/6733 Honda 68-position, solder cup, female connector Honda backshell

1-8 | ni.com

Chapter 1 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.

Driver software has an application programming interface (API), which is a library of VIs,

functions, classes, attributes, and properties for creating applications for your device.

NI-DAQmx includes a collection of programming examples to help you get started developing

an application. You can modify example code and save it in an application. You can use

examples to develop a new application or add example code to an existing application.

To locate LabVIEW and LabWindows/CVI examples, open the National Instruments Example

Finder:

• In LabVIEW, select Help»Find Examples.

• In LabWindows/CVI, select Help»NI Example Finder.

Measurement Studio, Visual Basic, and ANSI C examples are in the following directories:

• NI-DAQmx examples for Measurement Studio-supported languages are in the following

directories:

– NI-DAQ\Examples\MStudioVCxxxx

• Traditional NI-DAQ (Legacy) examples for Visual Basic are in the following two

directories:

– NI-DAQ\Examples\DotNETx.x

• NI-DAQmx examples for ANSI C are in the NI-DAQ\Examples\DAQmx ANSI C

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