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基于LABVIEW的数据采集卡MyDAQ英文资料
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基于LabVIEw的数据采集平台MYDAQ的技术资料!是学习LabVIEw不可或缺的一部分
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USER GUIDE AND SPECIFICATIONS
NI myDAQ
Figure 1. NI myDAQ
NI myDAQ is a low-cost portable data acquisition (DAQ) device that uses
NI LabVIEW-based software instruments, allowing students to measure
and analyze real-world signals. NI myDAQ is ideal for exploring
electronics and taking sensor measurements. Combined with NI LabVIEW
on the PC, students can analyze and process acquired signals and control
simple processes anytime, anywhere.
Contents
Conventions ............................................................................................ 2
Safety Information .................................................................................. 3
Electromagnetic Compatibility Guidelines............................................. 3
NI myDAQ Hardware Overview ............................................................ 4
Analog Input (AI) ............................................................................ 5
Analog Output (AO) ........................................................................ 5
Digital Input/Output (DIO).............................................................. 5
Power Supplies ................................................................................ 6
Digital Multimeter (DMM) Overview............................................. 6
NI myDAQ
NI myDAQ User Guide and Specifications 2 ni.com
NI myDAQ Software Overview ..............................................................7
NI ELVISmx Driver Software..........................................................7
NI LabVIEW and NI ELVISmx Express VIs ..................................7
NI myDAQ and NI Multisim ...........................................................7
Getting Started.........................................................................................8
Making Signal Connections with NI myDAQ ........................................8
Setting up Your NI myDAQ Device ................................................8
Connecting Signals...........................................................................10
Connecting Analog Input Signals.....................................................11
NI myDAQ DMM Fuse Replacement..............................................14
Digital I/O (DIO) and Counters/Timers ..................................................17
Using NI myDAQ with Soft Front Panel (SFP) Instruments ..................17
NI ELVISmx Instrument Launcher..................................................18
Digital Multimeter (DMM) ..............................................................19
Oscilloscope (Scope)........................................................................20
Function Generator (FGEN).............................................................21
Bode Analyzer ..................................................................................22
Dynamic Signal Analyzer (DSA).....................................................23
Arbitrary Waveform Generator (ARB) ............................................24
Digital Reader...................................................................................25
Digital Writer....................................................................................26
Example: Using the NI ELVISmx Oscilloscope SFP to
Measure a Signal with NI myDAQ ...............................................27
Using NI myDAQ with LabVIEW ..........................................................27
NI ELVISmx Express VIs in LabVIEW ..........................................27
Example: How to Measure Signals Using the NI ELVISmx
Oscilloscope Express VI with NI myDAQ....................................28
Using NI-DAQmx with NI myDAQ ................................................30
Example: How to Measure Audio Pass-Through in LabVIEW .......31
Specifications...........................................................................................34
Texas Instruments Components in NI myDAQ ......................................46
Resource Conflicts...................................................................................48
Additional Resources...............................................................................50
Related Documentation ....................................................................50
Other Resources................................................................................51
Common Terms and Acronyms........................................................51
Warranty...........................................................................................52
Where to Go for Support ..................................................................52
Conventions
The following conventions are used in this manual:
This icon denotes a tip, which alerts you to advisory information.
This icon denotes a note, which alerts you to important information.
© National Instruments Corporation 3 NI myDAQ User Guide and Specifications
This icon denotes a caution, which advises you of precautions to take to
avoid injury, data loss, or a system crash.
CAUTION—The inputs/outputs of this product can be damaged if
subjected to Electrostatic Discharge (ESD). To prevent damage,
industry-standard ESD prevention measures must be employed during
installation, maintenance, and operation.
Safety Information
Do not operate the hardware in a manner not specified in this document and
in the user documentation. Misuse of the hardware can result in a hazard.
You can compromise the safety protection if the hardware is damaged in
any way. If the hardware is damaged, return it to National Instruments for
repair.
Clean the hardware with a soft, nonmetallic brush. Make sure that the
hardware is completely dry and free from contaminants before returning it
to service.
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. There is
no guarantee that interference will not occur in a particular installation. To
minimize the potential for the product to cause interference to radio and
television reception or to experience unacceptable performance
degradation, install and use this product in strict accordance with the
instructions in the product documentation.
Cautions The following statements contain important EMC information needed before
installing and using this product:
• This product is intended for use in residential, commercial and industrial locations.
• 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.
NI myDAQ User Guide and Specifications 4 ni.com
NI myDAQ Hardware Overview
NI myDAQ provides analog input (AI), analog output (AO), digital input
and output (DIO), audio, power supplies, and digital multimeter (DMM)
functions in a compact USB device.
Tip The Common Terms and Acronyms section has a list of acronyms and terms that you
will see in this manual, and in many engineering and measurement documents and
websites.
Integrated circuits supplied by Texas Instruments form the power and
analog I/O subsystems of NI myDAQ. Figure 2 depicts the arrangement
and function of the NI myDAQ subsystems. Refer to Table 5 for more
information on all of the Texas Instruments components used in
NI myDAQ.
Figure 2. NI myDAQ Hardware Block Diagram
Note: NI myDAQ components may be changed or substituted without notice.
Protection
Circuit
DC/DC
Isolation
Transformer
LDO
Regulator
(TPS76433)
LDO
Regulator
(TPS76433)
VBUS
Isolated +3.3 V
+15 V
+3.3 V
+1.2 V
+5 V
–15 V
USB-STC3
Digital
Isolator
(ISO7241)
DMM
Shift
Register
(SN74AHC595)
Switch
(TS5A23159)
Regulator
(TPS61170)
Isolation
Barrier
HI
HI
COM
DAC
(DAC8551)
Switch
Gain
(TLE2082)
OP AMP
(OPA1642)
Audio AMP
(TPA6110A2)
AO 0
AO 1
Line Out R
Line Out L
Instrumentation
Amplifier
(TLE2082)
Channel
Multiplexer
(MPC509AU)
AI 0–
AI 0+
AI 1–
AI 1+
Line In L
Line In R
8
DIO x
USB Connector
Regulator
(TPS62007)
Regulator
(TPS62003)
ADC
(ADS8319)
OP AMP
(OPA1642)
Current
Limiter
(TPS2553)
(V Ω ) (A)
+3.3 V
LDO
Regulator
(TPS71501)
Isolated +5 V
© National Instruments Corporation 5 NI myDAQ User Guide and Specifications
Analog Input (AI)
There are two analog input channels on NI myDAQ. These channels can be
configured either as general-purpose high-impedance differential voltage
input or audio input. The analog inputs are multiplexed, meaning a single
analog-to-digital converter (ADC) is used to sample both channels. In
general-purpose mode, you can measure up to ±10 V signals. In audio
mode, the two channels represent left and right stereo line level inputs.
Analog inputs can be measured at up to 200 kS/s per channel, so they are
useful for waveform acquisition. Analog inputs are used in the
NI ELVISmx Oscilloscope, Dynamic Signal Analyzer, and Bode Analyzer
instruments.
Analog Output (AO)
There are two analog output channels on NI myDAQ. These channels can
be configured as either general-purpose voltage output or audio output.
Both channels have a dedicated digital-to-analog converter (DAC), so they
can update simultaneously. In general-purpose mode, you can generate up
to ±10 V signals. In audio mode, the two channels represent left and right
stereo outputs.
Caution If using earphones to listen to the audio output of the NI myDAQ, ensure that the
volume is set to a safe level. Listening to audio signals at a high volume may result in
permanent hearing loss.
Analog outputs can be updated at up to 200 kS/s per channel, making them
useful for waveform generation. Analog outputs are used in the
NI ELVISmx Function Generator, Arbitrary Waveform Generator, and
Bode Analyzer instruments.
Digital Input/Output (DIO)
There are eight digital I/O (DIO) lines on NI myDAQ. Each line is a
Programmable Function Interface (PFI), meaning that it can be configured
as a general-purpose software-timed digital input or output, or it can act as
a special function input or output for a digital counter. Refer to Digital I/O
(DIO) and Counters/Timers section for more information about counters
on NI myDAQ.
Note The digital I/O lines are 3.3 V LVTTL and are tolerant to 5 V inputs. The digital
output is not compatible with 5V CMOS logic levels.
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资源评论
- wc11112223332012-07-06不是很实用,因为说明书上只是简单的介绍产品并没有提供详细例程
- mycherished2012-12-10讲的还是有用的,谢了
entral168
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