USB-6009用户使用手册

发布时间：2024-11-08

NI USB-6009数据采集卡用户使用手册

USER GUIDE AND SPECIFICATIONS

NI USB-6008/6009

Bus-Powered Multifunction DAQ USB Device

This user guide describes how to use the National Instruments USB-6008 and National Instruments USB-6009 data acquisition (DAQ) devices and lists specifications.

The NI USB-6008/6009 provides connection to eight single-ended analog input (AI) channels, two analog output (AO) channels, 12 digital input/output (DIO) channels, and a 32-bit counter with a full-speed USB interface. Table1 compares the devices.

Table 1. NI USB-6008 and NI USB-6009 Comparison

Feature

AI resolution

Maximum AI sample rate, singlechannel*

Maximum AI sample rate, multiplechannels (aggregate)*DIO configuration

NI USB-600812 bits differential,11 bits single-ended

10 kS/s

10 kS/sOpen collector

NI USB-600914 bits differential,13 bits single-ended

48 kS/s48 kS/s

Each channel individually programmable as open collector

oractive drive

* System-dependent.

This document uses NI-DAQmx naming conventions. Open-drain is called open collector and push-pull is called activedrive.

NI USB-6009数据采集卡用户使用手册

Figure1 shows key functional components of the NIUSB-6008/6009.

Figure 1. NI USB-6008/6009 Block Diagram

Contents

Safety Guidelines.................................................................................................................................3Electromagnetic Compatibility Guidelines..........................................................................................3Unpacking............................................................................................................................................4Setting Up the NIUSB-6008/6009......................................................................................................4Using the NIUSB-6008/6009 in an Application.................................................................................6Features................................................................................................................................................7

USB Connector and USB Cable Strain Relief.............................................................................7LED Indicator..............................................................................................................................8Screw Terminal Connector Plugs................................................................................................8Firmware......................................................................................................................................8Cables and Accessories........................................................................................................................9Pinout and Signal Descriptions............................................................................................................9

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Analog Input........................................................................................................................................11

Analog Input Modes and Signal Sources.....................................................................................11

Floating Signal Sources.......................................................................................................12Ground-Referenced Signal Sources.....................................................................................13Taking Differential Measurements......................................................................................14Taking Referenced Single-Ended Measurements................................................................15Digital Trigger.............................................................................................................................15AnalogOutput......................................................................................................................................16

Connecting Analog Output Loads...............................................................................................16Minimizing Glitches on the Output Signal..................................................................................16DigitalI/O............................................................................................................................................17

Source/Sink Information..............................................................................................................18I/O Protection...............................................................................................................................19Power-On States..........................................................................................................................19Static DIO....................................................................................................................................19PFI0.....................................................................................................................................................19

Using PFI0 as a Digital Trigger..................................................................................................19Using PFI0 as an Event Counter.................................................................................................19External Reference and Power Source.................................................................................................20

+2.5V External Reference...........................................................................................................20+5 V Power Source......................................................................................................................20Specifications.......................................................................................................................................20Where to Go from Here.......................................................................................................................27

Example Programs.......................................................................................................................27Related Documentation................................................................................................................27Where to Go for Support.....................................................................................................................30

Safety Guidelines

Operate the NIUSB-6008/6009 device only as described in this user guide.

Do not operate the NI USB-6008/6009 in a manner not specified 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. You must have all covers and filler panels installed during operation of the device.

Caution

Do not operate the device in an explosive atmosphere or where there may be flammable

gases or fumes. If you must operate the device in such an environment, it must be in a suitably rated enclosure.

Caution

Electromagnetic Compatibility Guidelines

This product was tested and complies with the regulatory requirements and limits for electromagnetic compatibility (EMC) as stated in the product specifications. These requirements and limits are designed to provide reasonable protection against harmful interference when the product is operated in its intended operational electromagnetic environment.

This product is intended for use in industrial locations. There is no guarantee that harmful interference will not occur in a particular installation, when the product is connected to a test object, or if the product

is used in residential areas. To minimize the potential for the product to cause interference to radio and

NI USB-6009数据采集卡用户使用手册

television reception or to experience unacceptable performance degradation, install and use this product in strict accordance with the instructions in the product documentation.

Furthermore, any changes or modifications to the product not expressly approved by National Instruments could void your authority to operate it under your local regulatory rules.

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

and accessories.

CautionCautionCautionCaution

This product may become more sensitive to electromagnetic disturbances in the operational

environment when test leads are attached or when connected to a test object.

Emissions that exceed the regulatory requirements may occur when this product is

connected to a test object.

Changes or modifications not expressly approved by National Instruments could void the

user’s authority to operate the hardware under the local regulatory rules.

Unpacking

The NIUSB-6008/6009 device ships in an antistatic package to prevent electrostatic discharge (ESD). ESD can damage several components on the device.

Caution

Never touch the exposed pins of connectors.

To avoid ESD damage in handling the device, take the following precautions:

Ground yourself with a grounding strap or by touching a grounded object.

Touch the antistatic package to a metal part of your computer chassis before removing the device from the package.

Remove the device from the package and inspect it for loose components or any other signs of damage. Notify NI if the device appears damaged in any way. Do not install a damaged device in your computer or chassis.

Store the device in the antistatic package when the device is not in use.

Setting Up the NIUSB-6008/6009

Complete the following steps to get started with the NI USB-6008/6009.

For information about non-Windows operating system support, refer to the Getting Started with NI-DAQmx Base for Linux and Mac OS X Users document available from http:///manuals.

Note

1.2.

Install the application software (if applicable), as described in the installation instructions that accompany your software.Install NI-DAQmx1.

The NI-DAQmx software is included on the disk shipped with your kit and is available for download at http:///support. The documentation for NI-DAQmx is available after installation from Start»All Programs»National Instruments»NI-DAQ. Other NI documentation is available from http:///manuals.

Note

NI USB-6008/6009 devices are supported by NI-DAQmx 7.5 and later.

NI USB-6008/6009 User Guide and http://

NI USB-6009数据采集卡用户使用手册

Install the 16-position screw terminal connector plugs by inserting them into the connector jacks as shown in Figure2.

12Overlay Label with Pin Orientation GuidesScrew Terminal Connector Plug

Figure 2. Signal Label Application Diagram

Signal LabelUSB Cable

Affix the provided signal labels to the screw terminal connector plugs. You can choose labels with pin numbers, signal names, or blank labels, as shown in Figure3. Choose one of the labels, align the correct label with the terminals printed on the top panel of your device and apply the label, as shown in Figure2.

123User-Defined Custom LabelTerminal Number LabelDigital I/O Label

45Analog Input Differential Signal Name LabelAnalog Input Single-Ended Signal Name Lab

Figure 3. NI USB-6008/6009 Signal Labels

Note

After you label the screw terminal connector plugs, you must only insert them into the matching connector jack, as indicated by the overlay label on the device.

Plug one end of the USB cable into the NI USB-6008/6009 and the other end into an available USBport on the computer.

NI USB-6009数据采集卡用户使用手册

6.7.

Double-click the Measurement & Automation icon, shown at left, on the desktop to open Measurement & Automation Explorer (MAX).

Expand My System»Devices and Interfaces and verify that the NIUSB-6008/6009 is listed. If your device does not appear, press <F5> to refresh the view in MAX. If your device is still not recognized, refer to http:///support/daqmx for troubleshooting information.

Self-test your device in MAX by right-clicking NIUSB-600x and selecting Self-Test. Self-test performs a brief test to determine successful device installation. When the self-test finishes, a message indicates successful verification or if an error occurred. If an error occurs, refer to http:///support/daqmx.

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

and accessories.

Caution

Connect the wires (16 to 28 AWG) of a shielded, multiconductor cable to the screw terminals by stripping 6.35 mm (0.25 in.) of insulation, inserting the wires into the screw terminals, and securely tightening the screws with the flathead screwdriver to a torque of 0.22–0.25 N · m (2.0–2.2lb· in.). Refer to Figure6 for the NIUSB-6008/6009 pinout.

If using a shielded cable, connect the cable shield to a nearby GND terminal.

Note

For information about sensors, go to http:///sensors. For information about IEEE 1451.4 TEDS smart sensors, go to http:///teds.

Click Start to test the device functions, or Help for operating instructions. Click Close to exit the test panel.

10.Run a Test Panel in MAX by right-clicking NIUSB-600x and selecting Test Panels.

Using the NIUSB-6008/6009 in an Application

You can use the DAQ Assistant through many NI application software programs to configure virtual and measurement channels. Table2 lists DAQ Assistant tutorial locations for NI applications.

Table 2. DAQ Assistant Tutorial Locations

NI ApplicationLabVIEW

Tutorial Location

Go to

Help»LabVIEW Help. Next, go to Getting Started with LabVIEW»Getting Started with DAQ»Taking an NI-DAQmx Measurement in LabVIEW.

Go to Help»Contents. Next, go to Using LabWindows/CVI»Data Acquisition»Taking an NI-DAQmx Measurement in LabWindows/CVI.

Go to NI Measurement Studio Help»Getting Started with the Measurement

Studio Class Libraries»Measurement Studio Walkthroughs»Walkthrough: Creating a Measurement Studio NI-DAQmx Application.Go to Help»Taking an NI-DAQmx Measurement in SignalExpress.

LabWindows /CVI Measurement Studio

LabVIEW SignalExpress

Refer to the Where to Go from Here section for information about programming examples for NI-DAQmx and NI-DAQmx Base.

NI USB-6008/6009 User Guide and http://

NI USB-6009数据采集卡用户使用手册

Features

The NI USB-6008/6009 features a USB connector, USB cable strain relief, two screw terminal connector plugs for I/O, and an LED indicator, as shown in Figure4.

USB Cable Strain Relief

Screw Terminal Connector Plug

LED IndicatorUSB Connector

Figure 4. NI USB-6008/6009 Top and Back Views

USB Connector and USB Cable Strain Relief

The NI USB-6008/6009 features a USB connector for full-speed USB interface. You can provide strain relief for the USB cable by threading a zip tie through the USB cable strain relief ring and tightening around a looped USB cable, as shown in Figure5.

Figure 5. NI USB-6008/6009 Strain Relief

NI USB-6009数据采集卡用户使用手册

LED Indicator

The NI USB-6008/6009 device has a green LED indicator that indicates device status, as listed in Table3. When the device is connected to a USB port, the LED blinks steadily to indicate that the device is initialized and is receiving power from the connection.

Table 3. LED State/Device Status

LED StateNot litOn, not blinking

Device not connected or in suspend

Device Status

Device connected but not initialized, or the computer is in standby mode.

In order for the device to be recognized, the device must be connected to a computer that has NI-DAQmx installed on it.

Single-blinkOperating normally

Screw Terminal Connector Plugs

The NI USB-6008/6009 ships with one detachable screw terminal connector plug for analog signals and one detachable screw terminal connector plug for digital signals. These screw terminal connectors provide 16 connections that use 16–28AWG wire. Refer to step4 of the Setting Up the

NIUSB-6008/6009 section for information about selecting labels for the screw terminal connector plugs. Refer to the Pinout and Signal Descriptions section for the device pinout and signal descriptions.You can order additional connectors and labels for your device. Refer to the Cables and Accessories section for ordering information.

Firmware

The firmware on the NIUSB-6008/6009 refreshes whenever the device is connected to a computer with NI-DAQmx. NI-DAQmx automatically uploads the compatible firmware version to the device. The firmware version may be upgraded when new versions of NI-DAQmx release.

NI USB-6008/6009 User Guide and http://

NI USB-6009数据采集卡用户使用手册

Cables and Accessories

Table4 contains information about cables and accessories available for the NIUSB-6008/6009. For a complete list of accessories and ordering information, refer to the pricing section of the NIUSB-6008 or NIUSB-6009 product page at http://.

Table 4. NI USB-6008/6009 Cables and Accessories

Accessory

USB-6008/6009 Accessory KitUSB-6000 Series Prototyping Accessory

Part Number779371-01779511-01

Description

Four additional screw-terminal connectors, connectorlabels, and a screwdriver

Unshielded breadboarding accessory for

custom-defined signal conditioning and prototyping. You can use up to two accessories per device.1 m and 2 m lengths

Hi-Speed USB Cable

184125-01184125-02

Caution: For compliance with Electromagnetic Compatibility (EMC) requirements, this product must be operated with shielded cables and accessories. If unshielded cables or accessories are used, the EMC specifications are no longer

guaranteed unless all unshielded cables and/or accessories are installed in a shielded enclosure with properly designed and shielded input/output ports.

Pinout and Signal Descriptions

Figure6 shows the pinout of the NI USB-6008/6009. Analog input signal names are listed as

single-ended analog input name, AI x, and then differential analog input name, (AI x+/–). Refer to Table5 for a detailed description of each signal.

Figure 6. NI USB-6008/6009 Pinout

NI USB-6008/6009 User Guide and Specifications

NI USB-6009数据采集卡用户使用手册

Table 5. Signal Descriptions

Signal NameGND

Reference

—

Direction—

Description

Ground—The reference point for the single-ended analog input

measurements, analog output voltages, digital signals, +5VDC supply, and +2.5VDC at the I/Oconnector, and the bias current return point for differential mode measurements.

Analog Input Channels 0 to 7—For single-ended measurements, each signal is an analog input voltage channel. For differential measurements, AI0and AI4 are the positive and negative inputs of differential analog input channel 0. Thefollowing signal pairs also form differential input channels: AI<1, 5>, AI<2, 6>, and AI<3, 7>. RefertotheAnalog Input section for more information.

Analog Output Channels 0 and 1—Supplies the voltage output of AOchannel0 or AO channel 1. RefertotheAnalogOutputsection for more information.

Port0 Digital I/O Channels0to7—You can individually configure each signal as an input or output. RefertotheDigitalI/O section for more information.

Port1 Digital I/O Channels0to3—You can individually configure each signal as an input or output. Refer to the DigitalI/O section for more information.

PFI 0—This pin is configurable as either a digital trigger or an event counter input. Refer to the PFI0 section for more information.+2.5 V External Reference—Provides a reference for wrap-back testing. Refer to the +2.5V External Reference section for more information.

+5 V Power Source—Provides +5V power up to 200mA. Refer to the +5 V Power Source section for more information.

AI <0..7>VariesInput

AO <0, 1>GNDOutput

P0.<0..7>GNDInput or Output

P1.<0..3>GNDInput or Output

PFI 0+2.5 V

GNDGND

Input Output

+5 VGNDOutput

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Analog Input

The NI USB-6008/6009 has eight analog input channels that you can use for four differential analog input measurements or eight single-ended analog input measurements.Figure7 shows the analog input circuitry of the NI USB-6008/6009.

Figure 7. NI USB-6008/6009 Analog Input Circuitry

The main blocks featured in the NI USB-6008/6009 analog input circuitry are as follows:

MUX—The NI USB-6008/6009 has one analog-to-digital converter (ADC). Themultiplexer (MUX) routes one AI channel at a time to the PGA.

PGA—The progammable-gain amplifier provides input gains of 1, 2, 4, 5, 8, 10, 16, or 20 when configured for differential measurements and gain of 1 when configured for single-ended

measurements. ThePGA gain is automatically calculated based on the voltage range selected in the measurement application.

ADC—The analog-to-digital converter (ADC) digitizes the AI signal by converting the analog voltage into digital code.

AI FIFO—The NI USB-6008/6009 can perform both single and multiple analog-to-digital

conversions of a fixed or infinite number of samples. A first-in-first-out (FIFO) buffer holds data during AI acquisitions to ensure that no data is lost.

Analog Input Modes and Signal Sources

You can configure the AI channels on the NI USB-6008/6009 to take differential or referenced

single-ended (RSE) measurements. Table6 summarizes the recommended analog input mode(s) for floating signal sources and ground-referenced signal sources. Refer to Table5 for more information about I/O connections for single-ended or differential measurements.

NI USB-6009数据采集卡用户使用手册

Table 6. Analog Input Configurations

Floating Signal Sources

A floating signal source is not connected to the building ground system, but has an isolated ground-reference point. Some examples of floating signal sources are outputs of transformers,

thermocouples, battery-powered devices, optical isolators, and isolation amplifiers. An instrument or device that has an isolated output is a floating signal source.

Refer to the NI Developer Zone document, Field Wiring and Noise Considerations for Analog Signals, for more information. To access this document, go to http:///info and enter the Info Code rdfwn3.When to Use Differential Connections with Floating Signal Sources

Use DIFF input connections for any channel that meets any of the following conditions:

Your application requires input ranges other than ±10 V.The input signal is low level and requires greater accuracy.

The leads connecting the signal to the device are greater than 3m (10ft).The input signal requires a separate ground-reference point or return signal.

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The signal leads travel through noisy environments.

Two analog input channels, AI+ and AI–, are available for the signal.

DIFF signal connections reduce noise pickup and increase common-mode noise rejection. DIFF signal connections also allow input signals to float within the working voltage of the device.Refer to the Taking Differential Measurements section for more information about differential connections.

When to Use Referenced Single-Ended (RSE) Connections with Floating Signal SourcesOnly use RSE input connections if the input signal meets all of the following conditions:

The input signal can share a common reference point, GND, with other signals that use RSE.Your application permits the use of the ±10 V input range.

The leads connecting the signal to the device are less than 3m (10ft).

DIFF input connections are recommended for greater signal integrity for any input signal that does not meet the preceding conditions.

In the single-ended modes, more electrostatic and magnetic noise couples into the signal connections than in DIFF configurations. The coupling is the result of differences in the signal path. Magnetic coupling is proportional to the area between the two signal conductors. Electrical coupling is a function of how much the electric field differs between the two conductors.

With this type of connection, the PGA rejects both the common-mode noise in the signal and the ground potential difference between the signal source and the device ground.

Refer to the Taking Referenced Single-Ended Measurements section for more information about RSE connections.

Ground-Referenced Signal Sources

A ground-referenced signal source is a signal source connected to the building system ground. It is already connected to a common ground point with respect to the device, assuming that the computer is plugged into the same power system as the source. Non-isolated outputs of instruments and devices that plug into the building power system fall into this category.

The difference in ground potential between two instruments connected to the same building power system is typically between 1 and 100 mV, but the difference can be much higher if power distribution circuits are improperly connected. If a grounded signal source is incorrectly measured, this difference can appear as measurement error. Follow the connection instructions for grounded signal sources to eliminate this ground potential difference from the measured signal.

Use DIFF input connections for any channel that meets any of the following conditions:

Your application requires input ranges other than ±10 V.The input signal is low level and requires greater accuracy.

The leads connecting the signal to the device are greater than 3m (10ft).The input signal requires a separate ground-reference point or return signal.The signal leads travel through noisy environments.

Two analog input channels, AI+ and AI–, are available for the signal.

NI USB-6009数据采集卡用户使用手册

When to Use Referenced Single-Ended (RSE) Connections with Ground-Referenced Signal SourcesDo not use RSE connections with ground-referenced signal sources. Use differential connections instead.

As shown in the bottom-rightmost cell of Table6, there can be a potential difference between GND and the ground of the sensor. In RSE mode, this ground loop causes measurement errors.

Taking Differential Measurements

For differential signals, connect the positive lead of the signal to the AI+terminal, and the negative lead to the AI– terminal.

Figure 8. Connecting a Differential Voltage Signal

The differential input mode can measure ±20 V signals in the ±20V range. However, the maximum voltage on any one pin is ±10 V with respect to GND. For example, if AI 1 is +10 V and AI 5 is –10 V, then the measurement returned from the device is +20 V.

Figure 9. Example of a Differential 20 V Measurement

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Connecting a signal greater than ±10 V on either pin results in a clipped output.

Figure 10. Exceeding ±10 V on AI Returns Clipped Output

Taking Referenced Single-Ended Measurements

To connect referenced single-ended (RSE) voltage signals to the NIUSB-6008/6009, connect the positive voltage signal to an AIterminal, and the ground signal to a GND terminal, as shown in Figure11.

Figure 11. Connecting a Referenced Single-Ended Voltage Signal

When no signals are connected to the analog input terminal, the internal resistor divider may cause the terminal to float to approximately 1.4 V when the analog input terminal is configured as RSE. This behavior is normal and does not affect the measurement when a signal is connected.

Digital Trigger

You can configure PFI0 as a digital trigger input for analog input tasks. Refer to the Using PFI0 as a Digital Trigger section for more information.

NI USB-6009数据采集卡用户使用手册

AnalogOutput

The NI USB-6008/6009 has two independent analog output channels that can generate outputs from 0 to 5 V. All updates of analog output channels are software-timed. GND is the ground-reference signal for the analog output channels.

Figure12 shows the circuitry of one analog output channel on the NI USB-6008/6009.

Figure 12. Circuitry of One Analog Output Channel

The main block featured in the NI USB-6008/6009 analog output circuitry is the digital-to-analog converter (DAC), which converts digital codes to analog voltages. There is one DAC for each analog output line.

Connecting Analog Output Loads

To connect loads to the NI USB-6008/6009, connect the positive lead of the load to the AO terminal, and connect the ground of the load to a GND terminal, as shown in Figure13.

Figure 13. Connecting a Load

Minimizing Glitches on the Output Signal

When you use a DAC to generate a waveform, you may observe glitches in the output signal. These glitches are normal; when a DAC switches from one voltage to another, it produces glitches due to released charges. The largest glitches occur when the most significant bit of the DAC code changes. You can build a lowpass deglitching filter to remove some of these glitches, depending on the frequency and nature of the output signal. For more information about minimizing glitches. refer to the

KnowledgeBase document, Reducing Glitches on the Analog Output of MIO DAQ Devices. To access this document, go to http:///info and enter the Info Code exszek.

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