高性能数据采集——NI的Measurement—Ready

合集下载

NI_PXI-6229

RMB 2,475.00 0
RMB 655.00
0
RMB 1,315.00 0
RMB 820.00
0
RMB 2,475.00 1
RMB 3,470.00 0 RMB 2,890.00 0 RMB 3,305.00 0 RMB 2,890.00 0
RMB 2,475.00 0
RMB 655.00
0
RMB 1,315.00 0
NI PXI-6229
16位, 250 kS/s, 32路模拟输入
• 4路16位模拟输出 (833 kS/s) • 高达48路数字I/O; 32位计数器; 数字触发 • NIST校准认证书以及70多个信号调理选项 • 关联(Correlated)DIO (32条时钟线, 1 MHz) • 另有5倍采样速率的高速M系列和4倍分辨率的高精度M系列可供选择. • NI-DAQmx驱动软件和NI LabVIEW SignalExpress交互式数据记录软件
RMB 820.00
0
1. 进入/china/products并选择“商务中心”下方的“按产品编号订购”。 1. 将产品加入购物车后，便可通过查看“您的购物车选项”，提交订单、取得报价或打印传真表。
2. 电话订购 3. 请拨打021-50509800 或 852-26453186 ，提交订单或取得报价。
CB-68LPR - 非屏蔽
8 - 10
* 您已选择中国作为产品使用地。您曾于2010/01/09日打印本文，因此报价可能已经改变。请访问/china，查看当前报价。
步骤 4: 提交订单或取得报价在线订购或传真订购
RMB 2,475.00 1
RMB 3,470.00 0 RMB 2,890.00 0 RMB 3,305.00 0 RMB 2,890.00 0

产品选型手册

技术支持
泛华测控拥有遍布全国的产品服务网络和应用支持机构。我们的工程师将针对您的应用环境为您选择最适合的测试测量解决方案，您可就近与当地的区域负责工程师或办事机构联系，他们将第一时间为您提供帮助及支持。（具体请参考本手册内的各办事处联系信息，或登陆）
客户服务
泛华测控积累了丰富的测试测量工程经验，我们的“柔性测试”技术是以测试测量系统的整体功能及性能为关注对象，研究对满足测试测量系统需求的方法和手段进行研究及开发的技术。它整合了虚拟仪器、测试测量、机电一体化、网络通信及软件等多种技术；并以测试系统的精确性、可靠性、适应性、灵活性和拓展性为研究目标；既面向应用，又专注于测试行业的发展，推动着现代测试技术在实际应用中的快速发展。
提供NI专业培训课程服务
——最适合中国测控工程师的培训课程
北京中科泛华测控技术有限公司拥有ＮＩ在中国地区唯一授权的区域培训授课中心，提供教室和专业的设备，并由ＮＩ授权认证的讲师亲自授课。此外，您还能获得由ＮＩ美国总部颁发的培训证书，为您的职业生涯增添色彩！
NI在中国地区唯一授权的区域培训授课中心：泛华测控总部培训教室；讲师队伍：经验丰富的工程师讲师队伍，均通过ＮＩ专业讲师认证考核；培训方法：
ＤＡＱ事业部将精心为您提供：１．产品选型服务－根据您的测试测量需求及预算为您度身定制数据采集软硬件解决方案。２．售后技术咨询－ＤＡＱ事业部技术工程师为您提供专家级的售后技术支持以及产品质量保证。３．批量折扣服务－为ＯＥＭ（原始设备生产商）用户提供数据采集卡的批量折扣优惠。４．板卡暂借服务－为国内数据采集用户提供ＮＩ数据采集卡的租借服务。５．预备订货服务－为制造业客户提供预备订货服务，缩短产品供货周期。６．软件培训服务－为使用各种编程语言的工程师提供ＭｅａｓｕｒｅｍｅｎｔＳｔｕｄｉｏ软件培训课程。７．客户体验活动－为了更好地与同行业用户分享资源，ＤＡＱ事业部为新老客户提供各种用户体验活动，如数据采集应用方案有奖征文活动、新客户购换体验活动等，受到客户广泛欢迎。

在LabVIEW中实现数据采集

AI Read—从被AI Config分配的缓冲读取数据。它能够控制由缓冲读取的点数，读取数据在缓冲中的位置，以及是否返回二进制数或标度的电压数。它的输出是一个２维数组，其中每一列数据对应于通道列表中的一个通道.

AI Single Scan—返回一个扫描数据.它的电压数据输出是由通道列表中的每个通道读出的电压数据。使用这个VI仅与AI Config有关联，不需要AI Start和AI Read. AI Clear—清除模入操作、计算机中分配的缓冲、释放所有数据采集卡的资源.

硬件触发和软件触发

硬件触发:
硬件触发:

数字触发

TTL电平:

模拟触发

模拟信号: level, slope
硬件触发的设置
软件触发

当硬件触发条件不易实现时采用。软件触发又叫做条件取数（conditional retrieval），是通过控制数据读取来实现的。
软件触发是在数据采集时，对A/D转化的信号进行比较监测，当满足软件触发的条件时开始将采集数据读取到数据缓冲区，并在采集结束后将数据传输到计算机。
在LabVIEW中实现数据采集
数据采集系统的基本结构
数据采集卡
多路开关
放大器
采样／保持器
A D 转换器
数据采集卡
数据采集卡

多路开关:将各路信号轮流切换到放大器的输入端，实现多参数多路信号的分时采集. 放大器:将前一级多路开关切换进入的待采集信号放大(或衰减)至采样环节的量程范围内. 采样/保持器:取出待测信号在某一瞬时的值，并在A/D转换过程中保持信号不变. A/D转换器:将输入的模拟量转化为数字量输出，并完成信号幅值的量化.

USB-6008使用指南

请勿在可能发生爆炸的环境中或存在易燃气体的情况下使用设备。如必须用于此类环境，请选择合适的外壳。
© National Instruments Corporation
3
NI USB-6008/6009 用户指南和产品规范
请使用干布清洁设备。设备恢复运行前，请先验证设备是否完全干燥且不会产生污染。
文档内容包括 NI-DAQmx API 概述、测量任务、测量概念及函数参考信息，它集成在 Visual Studio .NET 文档中。通过开始 » 程序 »National Instruments»NI-DAQ»NI-DAQmx .NET Reference Help 可查看 NI-DAQmx .NET 文档。展开 NI Measurement Studio Help»
按照下列步骤在 Visual C++、Visual C# 或 Visual Basic .NET 平台创建应
用程序：
1. 在 Visual Studio .NET 中，点击 File»New»Project 打开 “New Project” 对话框。
2. 根据所用编程语言选择 Measurement Studio 文件夹。 3. 选择项目类型，添加 DAQ 任务。
关于 NI-DAQmx 方法和属性的帮助信息，见 NI Measurement Studio Help 中的 NI-DAQmx .NET Class Library 或 NI-DAQmx Visual C++ Class Library。关于在 Measurement Studio 中编程的帮助信息，见 NI Measurement Studio Help，它集成在 Microsoft Visual Studio .NET 帮助文档中。在 Visual Studio .NET 中，点击 Measurement Studio» NI Measurement Studio Help 查看文档。

学会NI-DAQmx10个函数,解决80%的数据采集应用问题

LabVIEW编程数据采集应用，本系列将通过视频和文本教程为您一一介绍。

本系列既适用于希望学习使用 DAQ助手的初学者，也适合需要使用 NI-DAQmx高工具»创建/编辑 DAQmx任务 [CVI]项目»添加新项目» DAQmx任务[. NET]DAQ助手可通过图形化界面让用户交互式地创建、编辑、运行NI- DAQmx虚拟通道和任务。

每个NI- DAQmx虚拟通道由DAQ设备上的一个物理通道以及该物理通道的配置信息，比如输入范围和自定义缩放。

一个NI- DAQmx任务就是一个包含虚拟通道、定时、触发信息、以及其他与采集和生成下列文档描述了 DAQ助手在 LabVIEW， LabWindows/CVI，和 .NET中的应用：NI-DAQmx Express VI 指南LabWindows/CVI 中DAQ助手的使用Measurement Studio中 DAQ助手的使用DAQ助手还可生成代码，用于配置和/ 或执行指定的采集或生成。

《DAQ助手帮助》以及《》文档均描述了在 LabVIEW中实现该操作的步骤。

下使用DAQ助手自动生成LabVIEW 代码图显示的是DAQ助手一个例程及其自动生成的配置和 LabVIEW代码范例。

DAQ助手提供的灵活性和/或性能有时无法满足某些数据采集应用。

这些应用可能需要以下简单但强大的NI- DAQmx函数。

3. NI- DAQmx虚拟通道创建函数库»NI- DAQmx»通道创建/配置 [CVI]Task. Channel. CreateChannel 属性 [.NET]“NI- DAQmx虚拟通道创建”函数可以创建一个虚拟通道并将它添加至任务，也可用于创建多个虚拟通道，并将它们都添加至一个任务中。

如果没有指定某个任务，则该函数自动创建一个任务。

NI USB6008 6009 用户指南

• Measurement Category II 适用于在与配电系统直接相连的电路上进
行的测量。该类别需参见当地配电标准（例如，标准壁装插座电源在
美国为 115 V，在欧洲为 230 V）。此类测量包括家用电器、便携式工
具和类似设备的测量。
• Measurement Category III 适用于在建筑物设施中进行的测量。此类
1 电气设备安全标准 IEC 61010-1 对测量类别进行了分类，测量类别也称为安装类别。
2 工作电压是指任何绝缘体上可能存在的最大交流电压有效值或直流电压值。
3 MAINS 是指为设备提供电力的危险带电供电系统。符合条件的电路也可连至用于测量目的的 MAINS 系统。
NI USB-6008/6009 用户指南和产品规范
数据采集设备开发虚拟仪器、数据采集和设备控制应用程序。点击开始 »
程序 »National Instruments»NI-DAQ»NI-DAQmx C Reference Help
查看文档。
.NET 语言，未安装 NI 应用软件
如已安装 Microsoft .NET Framework 1.1 或更高版本，可在 NI-DAQmx 中使用 Visual C# 和 Visual Basic .NET 编程语言创建应用程序（无需 Measurement Studio）。 API 文档需安装 Microsoft Visual Studio .NET 2003 或 Microsoft Visual Studio 2005。
设备工作环境的污染等级应小于等于二级。污染是指固态、液态或气态杂物，它会降低设备的绝缘强度或表面电阻率。污染等级说明如下：
• 污染等级 1 是指无污染或仅有干燥的、非导电性污染。此污染无影响。 • 污染等级 2 是指大多数情况下，仅产生非导电性污染。但需考虑偶然由

NIUSB_datasheetNI数据采集卡手册

Industrial Digital I/O Device for USB –60 V, Channel-to-Channel IsolatedOverview and ApplicationsThe National Instruments USB-6525 is a full-speed USB device with eight normally open, channel-to-channel isolated, solid-state relay outputs and eight ±60 VDC channel-to-channel isolated digital inputs. The NI USB-6525 offers features for industrial control and manufacturing test applications, such as factory automation, embedded machine control, and production line verification. The solid-state relay outputs have a 60 VDC/30 V rms switching voltage and 500 mA/ch maximum switching current, making them ideal for controlling pumps, valves, motors, and other industrial actuators. The eight isolated digital input channels break ground loops and offer protection from noise and spikes on external signals. You can also use one of the digital input channels as a 5 kHz, 32-bit event counter for counting digital pulses.HardwareThe USB-6525 has eight channel-to-channel optically isolated inputs,P1.<0..7>, and eight channel-to-channel optically isolated, solid-state relay outputs, P0.<0..7>. The isolated inputs consist of an optocoupler, a depletion-mode MOSFET-based current-limiting circuit, and a Schottky diode. Each channel has its own positive and negative terminals capable of detecting a wide range of DC signals, from 5 V TTL logic levels to DC power supply levels up to 60 V.PFI 0 (an alias to P1.7) can also function as the source for a 32-bit counter. In this mode, the device counts low to high transitions on P1.7. You can arm and disarm the counter as well as read or reset the count through software.You can connect loads to the solid-state relay outputs with an AC or DC power source. The default power-on state of the solid-state relays is open. The relays also remain open when the computer and the USB-6525device are powered off.•Small, portable digital I/O device •Eight channel-to-channel optically isolated inputs (±60 VDC)•Eight channel-to-channel optically isolated, solid-state relay outputs (60 VDC/30 V rms max)•500 mA maximum switching current per channel•One 32-bit event counter•Full-speed USB (12 Mb/s) bus interface •Built-in, removable connectors for easy connectivity•USB cable strain relief Operating Systems•Windows Vista/XP/2000Recommended Software •LabVIEW•LabWindows™/CVI •Measurement Studio •LabVIEW SignalExpressOther Compatible Software •Visual Studio .NET•C, C++•Visual BasicMeasurement Services Software (included)•NI-DAQmx driver software •Measurement & Automation Explorer configuration utility•LabVIEW SignalExpress LEdata-logging softwareNI USB-6525IsolationIsolation is a form of built-in signal conditioning that provides an extended voltage range for direct connectivity to industrial sensors and actuators. The USB-6525 provides channel-to-channel isolation where each channel is physically and electrically separated from the others. Isolation provides three main benefits:1.Safety from hazardous high voltages and transients2.Rejection of common-mode voltages3.Removal of ground loopsSafety from High-Voltage TransientsIsolation electrically separates high-voltage front-end channels from each other and the low-voltage back end of the USB-6525. Signalsare passed between the two sections of the device using optocouplers. By separating the two sections, any voltages within the isolation specifications are prevented from entering the USB bus section or other channels. Isolation provides protection for the user, data acquisition system, and measurement data.Common-Mode Voltage RejectionA voltage common to both sides of a differential circuit pair iscalled common-mode voltage. This phenomenon is typical in noisy environments containing machinery and inductive loads. The differential voltage across the circuit pair is the desired signal, whereas the common voltage signal is the unwanted signal that may have been coupled into the transmission line. The USB-6525 can measure signals from lines with signal plus common-mode voltage of up to 60 VDC.Ground Loop RemovalGround loops are the most common source of noise in data acquisition applications. They occur when two connected terminals in a circuit are at different ground potentials, causing current to flow between thetwo points. This additional voltage can cause significant error in the measurement. When a ground loop exists, the measured voltage isthe sum of the signal voltage and the potential difference that exists between the signal source ground and the measurement system ground. This potential is generally not a DC level; therefore, the result is a noisy measurement system. By offering an isolated floating ground on the front end, the isolated USB-6525 devices are able to prevent ground loops from forming.SoftwareNational Instruments measurement services software, built aroundNI-DAQmx driver software, includes intuitive application programming interfaces, configuration tools, I/O assistants, and other tools designed to reduce system setup, configuration, and development time. National Instruments recommends using the latest version of NI-DAQmx driver software for application development in National Instruments LabVIEW, LabWindows/CVI, and Measurement Studio. To obtain the latest version of NI-DAQmx, visit /support/daq/versions. NI measurement services software speeds up your development with features including:•A guide to create fast and accurate measurements with no programming using DAQ Assistant•Automatic code generation to create your application in LabVIEW; LabWindows/CVI; LabVIEW SignalExpress; and Visual Studio .NET,C/C++/C#, or Visual Basic using Measurement Studio •Multithreaded streaming technology•More than 3,000 free software downloads to jump-start your project available at /zone•Software configuration of all digital I/O features without hardware switches/jumpers•Free LabVIEW SignalExpress LE data-logging softwareThe USB-6525 is compatible with the following versions (or later) of NI application software – LabVIEW, LabWindows/CVI, and Measurement Studio versions 7.x or LabVIEW SignalExpress. You can also use your NI digital I/O device with ANSI C, Microsoft Visual C++, Visual Basic, and the Microsoft .NET languages C# and Visual Basic .NET. The USB-6525 is not compatible with the Traditional NI-DAQ (Legacy) driver.Ordering InformationNI USB-6525..........................................................................779640-01 Includes NI-DAQmx software, LabVIEW SignalExpress LE data-logging software, anda USB cable.NI USB-6000 Series Prototyping Accessory........................779511-01 Includes breadboarding area with cover and strain relief.SpecificationsThese specifications are typical at 25 °C, unless otherwise noted.Isolated InputsNumber of channels............................8, ch-ch isolatedInput voltage range.............................-60 to 60 VDCDigital logic levelsInput current........................................ 3.0 mA/channel maxSolid-State Relay OutputsNumber of channels............................8, ch-ch isolatedRelay type...........................................Normally open solid-state relay(SSR)Switching voltage...............................60 VDC/30 V rms max Switching current (per channel).........500 mA max, full operationtemperature range Switching rate (90% duty cycle)......... 5 operations per second Relay open time..................................60 µs typRelay close time.................................. 1.2 ms typOn-resistance......................................550 mΩ, maxOff-leakage current (max)...................0.6 µA typCounterNumber of counters............................ 1 (P1.7 can be configured asa counter) Resolution...........................................32 bitsCounter measurements.......................rising edge counting Maximum input frequency.................. 5 kHzMinimum high pulse width.................20 µsMinimum low pulse width..................180 µsBus InterfaceUSB B 2.0 full-speed (12 Mb/s)Power RequirementsInput voltage....................................... 4.5 to 5.25 VDC in configuredstateActive current......................................150 mA maxSuspend current..................................350 µA typPhysical CharacteristicsDimensionsWithout connectors........................ 6.35 by 8.51 by 2.31 cm(2.50 by 3.35 by 0.91 in.)With connectors.............................8.18 by 8.51 by 2.31 cm(3.22 by 3.35 by 0.91 in.)I/O B series B receptacle,(2) 16 position (screw terminal)plug headers Screw-terminal wiring........................16 to 28 AWG copper conductorwire with 10 mm (0.39 in.) ofinsulation stripped from the end Torque for screw terminals.................0.22 to 0.25 N · m(2.0 to 2.2 lb in.)WeightWith connectors.............................Approx. 87 g (3.1 oz)Without connectors........................Approx. 64 g (2.3 oz)IsolationChannel-to-channel ............................60 VDC continuousChannel-to-earth ground ....................60 VDC continuous Withstand ..........................................60 VDC continuousNote:Do not use this module for connection to signals or for measurements within Measurement Categories II, III, or IV. EnvironmentNI 6528 and PXI-6529 devices are intended for indoor use only. Pollution degree (IEC-60664) (2)Operating EnvironmentAmbient temperature .........................0 to 55 °CRelative humidity................................10 to 90%, noncondensing Maximum altitude ..............................2,000 m at 25 °C ambienttemperature(tested in accordance with IEC-60068-2-1, IEC-60068-2-2, and IEC-60068-2-56)Storage EnvironmentAmbient temperature .........................-40 to 85 °CRelative humidity ...............................5% to 95%, noncondensing (tested in accordance with IEC-60068-2-1, IEC-60068-2-2, and IEC-60068-2-56)Safety and ComplianceSafetyThis product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use:•IEC 61010-1, EN 61010-1•UL 61010-1, CSA 61010-1Note:For UL and other safety certifications, refer to the product label or visit /certification, search by model number or product line, and click the appropriate link in the Certification column. Electromagnetic CompatibilityThis product is designed to meet the requirements of the following standards of EMC for electrical equipment for measurement, control, and laboratory use:•EN 61326 EMC requirements; Minimum Immunity•EN 55011 Emissions; Group 1, Class A•CE, C-Tick, ICES, and FCC Part 15 Emissions; Class ANote:For EMC compliance, operate this device according toproduct documentation.CE ComplianceThis product meets the essential requirements of applicable European Directives, as amended for CE marking, as follows:•73/23/EEC; Low-Voltage Directive (safety)•89/336/EEC; Electromagnetic Compatibility Directive (EMC) Note:Refer to the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain the DoC for this product, visit /certification, search by model number or product line, and click the appropriate link in the Certification column.Waste Electrical and Electronic Equipment (WEEE)EU Customers:At the end of their life cycle, all products must be sent to a WEEE recycling center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit/environment/weee.htm.NI Services and SupportNI has the services and support to meet your needs around the globe and through the application life cycle – from planning and development through deployment and ongoing maintenance. We offer services and service levels to meet customer requirements in research,design, validation, and manufacturing. Visit /services .Training and CertificationNI training is the fastest, most certain route to productivity with our products. NI training can shorten your learning curve, save development time, and reduce maintenance costs over the application life cycle. We schedule instructor-led courses in cities worldwide, or we can hold a course at your facility. We also offer a professional certification program that identifies individuals who have high levels of skill and knowledge on using NI products. Visit /training .Professional ServicesOur NI Professional Services team is composed of NI applications and systems engineers and a worldwide National Instruments Alliance Partner program of more than 600 independent consultants andintegrators. Services range from start-up assistance to turnkey system integration. Visit /alliance .OEM SupportWe offer design-in consulting and product integration assistance if you want to use our products for OEM applications. For information about special pricing and services for OEM customers, visit /oem .Local Sales and Technical SupportIn offices worldwide, our staff is local to the country, giving you access to engineers who speak your language. NI delivers industry-leading technical support through online knowledge bases, our applications engineers, and access to 14,000 measurement and automationprofessionals within NI Developer Exchange forums. Find immediate answers to your questions at /support .We also offer service programs that provide automatic upgrades to your application development environment and higher levels of technical support. Visit /ssp .Hardware ServicesNI Factory Installation ServicesNI Factory Installation Services (FIS) is the fastest and easiest way to use your PXI or PXI/SCXI combination systems right out of the box.Trained NI technicians install the software and hardware and configure the system to your specifications. NI extends the standard warranty by one year on hardware components (controllers, chassis, modules)purchased with FIS. To use FIS, simply configure your system online with /pxiadvisor .Calibration ServicesNI recognizes the need to maintain properly calibrated devices for high-accuracy measurements. We provide manual calibration procedures, services to recalibrate your products, and automated calibration software specifically designed for use by metrology laboratories. Visit /calibration .Repair and Extended WarrantyNI provides complete repair services for our products. Express repair and advance replacement services are also available. We offerextended warranties to help you meet project life-cycle requirements. Visit /services.National Instruments • info@ • 800 813 3693*351494A-01*351494A-012007-8768-301-101-D。

虚拟仪器第10章

10.1 数据采集卡设置与测试
3、数据采集卡的相关参数
(5) 建立时间——从输入的数字量发生突变时开始，直到输入电压进入与稳态值相差正负1/2LSB范围以内的这段时间。该参数反映DAC的转换从一个稳态值到另一个稳态值的过度过程的长短。
12
10.2 多通道的采样方式
通用的数据采集卡一般都有多个模入通道，但多数采集卡并非每个通道配一个ADC，而是各通道共用一个ADC，在ADC之前一般要配置多路开关(MUX)、仪器放大器(Inst Amp)和采样保持器(S/H) 这样，通过采样保持和多路开关的切换，可以实现多通道的数据采集。当对多个通道的数据进行采样时，在一次扫描中，数据采集卡将对所有用到的通道进行一次采样。扫描速度是数据采集卡每秒进行扫描的次数。多通道采样方式有3种——循环采样、同步采样和间隔采样。间隔采样最为常用。采样方式的选择——一般选择间隔采样，如果要求信号准确同步，选择同步采样，如对同步没有要求，可选择循环采样。
2
10.1 数据采集卡设置与测试
1、数据采集卡(DAQ)的功能简介
DAQ的功能——包括模拟输入(“模入”)、模拟输出(“模出”)、数字I/O、计数器/定时器等。模拟输入——是数据采集卡的基本功能。一般由：放大器(Amplifier)、多路开关(MUX)、采样保持电路(S/H)、模/数转换器(ADC)组成。经过这几个部分，将模拟信号转化为计算处理的数字信号。 ADC的性能和参数直接影响着采集数据的质量，应根据实际测量所需精度来选择合适的ADC。模拟输出——通常是为采集系统提供激励。数据采集卡的模拟输出信号受其数/模转换器(DAC)的建立时间、分辨率等因素影响，根据实际需要考虑DAC的参数指标。
4

NI PXIe-6124数据采集卡说明书

Sampling rate Maximum One channel............................4 MS/s Two channels..........................2.5 MS/s Minimum ....................................No minimum
800 k
1M
Frequency (Hz)
Magnitude (dB)
2 0 –2 –4 –6 –8 –10
1k
Frequency Response, All Ranges
10 k
100 k
1M
Frequency (Hz)
10 M
NI 6124 Specifications
2

© National Instruments Corporation
Overvoltage protection (AI +, AI –)......................................±36 V
Input current during overvoltage conditions ....................±20 mA max
Interchannel skew............................5 nS
Crosstalk (at 100 kHz).....................–100 dB
CMRR (at 60 Hz) ............................75 dB
DC Transfer Characteristics
Type of ADC Resolution................................... 16 bits, 1 in 65,536 Pipeline....................................... 0

基于格西测控大师和NI-DAQmx进行数据采集方案实现例程

2020 上海格西信息科技有限公司
格西测控大师
6
PhysicalChannelAccess.External), null, null, null};
string[] paramResults = this.Context.ShowParameterDialog("DAQmx 参数设置 ",paramNames,paramDefaults,parameterOptions);
运行例子前提条件： 1）从 National Instruments 官网下载 NI-DAQmx 20.0 版本软件并安装；安装完毕 NI-DAQmx 软件驱动包，在目录 C:\Users\Public\Documents\National Instruments\NIDAQ\Examples\DotNET4.5 下，存放 NI-DAQmx 的常用例子，本例子项目的脚本基本上是参考这些例子编写的。 2）运行 NI MAX 设备管理软件，通过设备和接口节点，新建仿真设备 NI USB9234（名称 SimUSB9234，可以测量加速度等）和 NI PCI-6238（名称 SimPCI-6238，可以测量电流等）。
本项目演示如何通过 NI-DAQmx 提供的 API 来控制 National Instruments DAQ 设备，实现数据采集任务。
本例子文件位于：<软件安装目录>\Examples\Solutions\DAQ。
文件说明： DAQmx.gpj
- 演示使用 NI 的 DAQmx 驱动库来进行数据采集 - 中文
2020 上海格西信息科技有限公司
格西测控大师
9
3）在项目管理器中选择“序列->AnalogIn->MeasureAcceleration->”步骤，点击工具栏的“运行”按钮，运行前弹出参数设置对话框，使用默认参数执行即可。

1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。

生的误差就叫 “ 化误定时间指的是ＤＡＱ设备为达到一定的精确度并保持这一特定的精
确度所需的一小段时间。无论要求怎
备精度上的量化误差仅仅是造成测试
结果误差原因中的极小部分。由于硬件设计的不同，其它类型的错误将呈
许多科学家和工程师们在评估ＤＡＱ产品的优劣时，往往只考虑它的精度位数。例如，认为使用ｌ位精度６
的ＤＡＱ设备，用户可得到２６６，３ｌ＝５５６
由于设计中的诸多考虑，当温度变化ｌ摄氏度时，ｌ６位精度的
一
７５５
温度漂移
ＤＡＱ设备的精确度会随着它温
度的改变而发生变化。Ｍｅｓｒｍ— ａｕｅ
ＴｍｅＩＥ０
Ｓｎ２５ｅｈａ
ｆ Ⅵ
‘
５７５１０
，ｒ
种叫做 “ 动”的硬件技术，解决抖
ｅｔＲｅｄＤＡＱ产品在设计上有如ｎ－ａｙ
下几点优势，因而能将因温度变化引
了此类问题。 “ 动 ” 使得对信号产抖
生影响的噪声偏大和偏小的可能性接
起的误差缩小到最小范围。 ●高品质的元部件：能在很大的温度范围内保持数值的稳定。 ●补偿元件：可以为其它部件产
ＭｅｓｒｍｅｔＲａｙａｕｅｎ — ｅｄＤＡＱ设备所读
屏蔽、接地因素的周密考虑，这一切优秀品质使得设备的噪声最小化了。
下图展示的是一般的ＤＡＱ设备与
取的数据变化仅为０００％以下。这．０６种抗温度变化的性能，确保了在温度
样的增益和采样率，Ｍｅｓｒｍｅｔａｕｅｎ —
ＲｅｄＤＡＱ设备都可以确保根据要ａｙ
求稳定下来。下图显示了ｌ位Ｅ列２系
现极其多种的形式。ＮＩ司的公
ＭｅｓｒｍｅｔａｕｅｎＲｅｄＤＡＱ设备可ａｙ
◆ 一般的ＤＱ设备与ＭｅｓｒｍｅｔｅｄＡａｕｅｎ—ＲａｙＤ设备在读取７５Ｄ高稳定信号时的差ＡＱ．ＶＣ
异。
以最大程度上减少各种类型的误差可
ＤＡＱ卡最差的稳定时间范围。在电压
范围为ｌＶ时，此设备的量化误差为０１２ｍＶ。要知道，量化误差只是整．２
发生漂移时的读数准确性。
ＭｅｓｒｍｅｔＲａｙＡＱａｕｅｎ — ｅｄＤ设备在读
个可能的数据点。这６，５６值均５３个匀地分布在一个电压范围内，而任何
一
个采样得到的信号都会被指向这些
值的其中一个。在此指向过程中所产
号，其偏移值被称为噪声层。由于
●板上温度传感器：可随时供编
线性和非线性误差
ＭｅｓｒｍｅｔＲａｙＤＡＱａｕｅｎ－ｅｄ设备
采用最优的组件，这使得模数转换器
程或操作人员用来评估设备当前温
体测量误差的一小部分。
— —
原因，在购买任何一种硬件设备，例￣ＤＡＱ设备时，都需认真考虑。ｎ
・１０
些数据并想算出其平均值时，这些数
据却普遍偏高，这时，我们得出的结果会怎样？自然是数据偏高。
ＭｅｓｒｍｅｔＲｅｄＤＡａｕｅｎ — ａｙＱ设备采用
维普资讯
Ｎ鬈赫震鞠０靠
高性能采集同ｌｊ数据工Ｆ匕
电子产品
哪的Ｍｅｓｒｍｅｔｅｄａｕｅｎ— ａｖＲ
各种传感器最终都是将物理参量转换为可以通过电线传送的电信号。当这些电线连接到数据记录器等任何类型的测量硬件上时，您肯定希望读取到的是精确的数值。可同时我们也很清楚，没有一种测试硬件是完美的。因此您必须考虑的问题是：我能够接受的最大误差值是多少呢？
取７５．ＶＤＣ高稳定信号时的差异。噪声层越低越好，但这只适用在由于噪声导致的误差在理想的数据上下等同的情况之下。当我们搜集到一
能，所有的精确率数据均在ＮＩ品目产录和用户手册上 “ 绝对精确 ”一栏有
详细介绍。这些都是可能导致误差的
度。
ＭｅｓｒｍｅｔＲｅｄＤＡＱ设备具有ａｕｅｎ — ａｙ
高性能元部件，加上其设计上的正确
网址：ＷＷＷ．ｃｈｐｅ．ｏｃｐｓｏｐｒｃｍ．ｎ
生逆向误差，从而有效地中和误差。
◆ １位Ｅ２系列ＤＱ最差的稳定时间范围Ａ卡
近。从统计数据来看，此技术增强了该检测设备的精确性。抖动技术的使用不需使用者做任何工作，也不需要
任何专业知识。
系统噪声
噪声诸如热或电等因素的干扰都会引起测量值偏离实际的被测信