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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.
Other product and company names listed are trademarks or trade names of their respective companies. For your test system, determine the factors that are most important and choose an architecture that best meets your needs. A modular, software-defined test system architecture, like the one shown in Figure 1, is based on a layered approach with the following advantages:.
Increased test system flexibility deployable to a variety of applications, business segments, and product generations Higher-performance architectures that significantly increase test system throughput and deliver tight correlation and integration of instruments from multiple suppliers including precision DC, high-speed analog and digital, and RF signal generation and analysis Lower test system investments by reducing initial capital investment and maintenance cost while increasing equipment use across multiple test requirements Increased test system longevity based on widely adopted industry standards that implement technology upgrades to improve performance and meet future test requirements.
To minimize maintenance costs and ensure test system longevity, it is important to implement a test strategy that separates the DUT-level tasks from the system-level tasks so you can quickly reuse, maintain, and change test programs or modules created throughout the development cycle to meet specific test requirements.
In any test system, operations are often different and common for each device tested such as system- level tasks. Operations that are common for each device should be handled by the test executive. A test executive that handles the common operations can save time for your developers because they do not have to write the same code for multiple devices. They can spend their time writing the code to handle the operations that are different for each device. Using a test executive also ensures consistency among common operations and circumvents having multiple developers write the same type of code for several devices.
You can choose from several test executives. Some companies write their own test executive, and others opt to use commercially available software such as NI TestStand. You should select the test executive that is best for your test system, whether you are creating a custom test executive or using one that is commercially available.
NI TestStand includes the Sequence Editor development environment for automated test system development, as shown in Figure 2. With the NI TestStand Sequence Editor, you can create test sequences, which automate the execution of code modules written in any programming language.
Each code module executes a test on the device under test and returns measurement information to NI TestStand. You can automatically log test result information in a report or database. In addition, systems written in NI TestStand can integrate with source code control, requirements management, and data management systems.
NI TestStand was designed to address four key areas: 1 simplify complex sequence development, 2 accelerate complex sequence development, 3 increase code and test system reusability and maintenance, and 4 improve test system execution performance.
These focus areas have led to the adoption of NI TestStand in consumer electronics for validation and manufacturing test, military and aerospace applications, the medical industry, and IC characterization. Architecture Layer No. Using these tools, you can communicate with a variety of instruments, integrate measurements, display information, connect with other applications, and more.
You spend most of your development time working with an ADE, so it is critical to choose one that is easy to use, supports multiple platforms, and integrates easily with measurement and control services. Other features that you should consider when choosing an ADE for developing your test system are its presentation and reporting features, likelihood of product obsolescence, and the kind of training and support available worldwide.
Factors to consider when selecting an ADE include the following: Ease of use Measurement and analysis capabilities Integration with measurement and control drivers Training and support Multicore support Operating system independence Presentation and reporting features Protection against obsolescence Upgrades. Measurement and control services software provides modular software interfaces for configuring and programming your tests.
Configuration Manager A configuration manager, such as MAX, presents a unified system view of measurement hardware supported in the measurement and control services software. With MAX, you can define channel names to organize signals or specify scaling functions to convert digitized signals to measurement quantities. The key benefit of the configuration manager is the integration with the ADEs, which gives you the ability to easily integrate multiple measurements into a single application without tedious programming.
With these configuration tools, you can avoid spending time configuring these measurement functions programmatically. Instrument Connectivity Integrating traditional instruments into the test software framework requires technologies such as Plug and Play instrument drivers and IVI to facilitate the communication with these instruments and their interchangeability.
Instrument drivers help you get started using your instrument from your computer and save you development time and cost because you do not need to learn the programming protocol for each instrument. With open-source, well-documented instrument drivers, you can. IVI implements a driver framework that facilitates instrument interchangeability by using a general API for each kind of instrument and separately implementing the driver to communicate with particular instruments.
Separating the API from the particular driver implementation of each instrument gives you the ability to design a system using a particular IVI-compliant oscilloscope; after the system is deployed, you can change the brand and model of the instrument without having to rewrite the test application.
Programming Tools Drivers can go beyond providing an easy-to-use API by adding tools to facilitate development and save you time. The DAQ Assistant presents a panel to the user for configuring common data acquisition parameters without programming. The combination of easy-to-use assistants and powerful programming environments is necessary to provide rapid development and the capabilities to meet a variety of application requirements.
An important aspect of the computing platform is the ability to connect and communicate with multiple instruments in a test system. These buses have different strengths that make some more suitable for certain applications than others. For example, GPIB has the widest adoption for instrument control and availability of instrumentation; USB provides wide availability, easy connectivity, and high throughput; LAN is well-suited for distributed systems; and PCI Express delivers the highest performance.
The widespread use of the PC has generated the proliferation of high-performance internal buses including PCI and PCI Express, which offer the lowest latency and highest data throughput or bandwidth.
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