Electromagnetic interference emi and electromagnetic. Test case is one of the significant components of the testing phase. Electromagnetic compatibility emc design and test case analysis. Using software techniques to resolve issueswith susceptibility to emi can be quite.
Apr 12, 2016 software test design techniques, static and dynamic test techniques, black box testing techniques, use case testing. Emc measurements are thought of as either a black art that requires years of specialist experience to address or something that can be achieved with very minimal equipment e. Emc testing is expensive, failing in the chamber is the worst case scenario. The equivalence partitions are frequently derived from the requirements specification for input data that influence the processing of the test object. Equivalence partitioning test case design technique is one of the testing techniques. A practical introduction to techniques for the design of electronic products from the electromagnetic compatibility emc perspective introduces techniques for the design of electronic products from the emc aspects covers normalized emc requirements and design principles to assure product compatibility describes the main topics for the control of electromagnetic interferences and recommends. Hence, to help you with the process, following is a detailed discussion on test case design techniques. Nov 16, 2010 first time qe 2010 test case design catalin anastasoaie v1.
The more the number of test cases, the longer it will take to execute and analyse these tests. Following are the typical design techniques in software engineering. Detailed analysis case for the pcb design of analog. An emc test plan that gave sufficient confidence for safety would be much too lengthy, and much too costly. The main techniques used to derive test conditions are explained with examples in this session. Test design techniques software testing times tutorials. Here are the collections of top 20 multiple choice questions on software testing techniques in software engineering includes mcq on software testing fundamentals. Pdf validation and verification techniques for emc for functional. This is a session on the test case design techniques widely used in the software industry. Jun 06, 2014 armstrong states in the preface, the focus of this book is on wellproven good emc design techniques to save time and money in product design and development. Test case design and testing techniques factors to consider. In this level, you will write the basic cases from the available specification and user documentation. Emc testing the eu experience in compliance magazine. Designing good test cases ensure that every aspect of your software gets tested so that you can find and fix any issues.
A previous paper has described proven good design techniques for emc for functional safety. With the increasing demand for highspeed circuits, pcb design is becoming significantly more challenging. Test case design techniques are one of the important topics in software testing. Just as for safetyrelated software part 3 of 8, appropriate emc design techniques. Deriving test cases directly from a requirement specification or black box test design technique. Black box test design techniques like boundary value analysis, equivalence partitioning, decision table testing, state transition testing, use case testing. Boundary value analysis bva equivalence partitioning ep decision table testing. Microcontroller reference circuit schematics with protection examples. Design techniques for emc part1 cherry clough consultants july 2001 page 4 of 26 totempole output stages in digital ics go through a brief period when both devices are on, whenever they switch from one state to the other. Beginners guide to software testing page 8 what makes a good tester. Test case design techniques using test case software reqtest. Knowledge on the internal structure code of the aut application under test is not necessary to use these black box test design techniques.
Software test design techniques, static and dynamic test design techniques, black box techniques, equivalence classes, boundary value analysis, decision table testing, state transition testing. The test case design techniques are broadly classified into three major categories. Black box test design techniques are used to pick the test cases in a systematic manner. Top 10 emc design considerations cypress semiconductor. Test case design using use cases, use case main stream scenario and alternative. Test case design and testing techniques rapidvalue. Emcvu also allows you to configure standards not included with the ability to set frequency ranges or limit. Test design techniques archives software testing mentor. How to prepare for emc testing emc testing beginners. Test design techniques help in achieving high test coverage. Electrostatic discharge esd is the exchange of electrons resulting from the field. Software testing lifecycle 2 test deliverables 7 test design techniques 11 test levels 4 test plan and test cases 6 testing certifications 1 training 3 types of testing 22 uncategorized 1 verification and validation 3. The static test design techniques are the testing techniques that involve testing without executing the code or the software application.
The suite of emc tests usually includes some form of each of thefollowing. Many people, when creating a test plan or writing the test case, fail to decipher what to test in a given cycle or what not to test in a given project. Top 20 mcq questions on software testing techniques. Emc design and test case analysis zheng, junqi download. Emc design techniques for electronic engineers by keith armstrong bsc hons ceng fiet smieee acgi. This course outlines the methods and techniques that can be followed to design test cases in such a way that we get the maximum coverage using an optimal set of test cases. Emi, emc, eft, and esd circuit design consideration for 32bit microcontrollers introduction. Component segregation for an emc free design, components on the pcb need to be grouped according to their. Why the test case design techniques are so important. In this procedure, a set of predecided inputs are fed into the software and the output produced is measured against the expected results.
This is the practical stage in which writing cases depend on the actual functional and system flow of the application. Em immunity testing techniques for the achievement of emc. One of the factors that influence the cost of testing is the number of test cases. Finally, ill share some thoughts on esd testing you can do in the engineering lab to validate your design prior to formal compliance testing. As software engineering is now being considered as a technical engineering profession, it is important that the software test engineers posses certain traits with a relentless attitude to make them. Test case in simple terms refers to a documentation which specifies input, preconditions, set of execution steps and expected result. Test suite is a container that has a set of tests which helps testers in executing and reporting the test execution status. Black box test design techniques are widely used as a best practice in the industry.
Electromagnetic compatibility emc design and test case analysis offers full illustrative, practical demonstrations and fills the gap for both industry professionals and graduate students alike. These test design techniques are used to derive the test cases from the requirement specification document and also based on testers. Esd, dips, flicker, dropouts, electromechanical switching get more from emc standards emc standards is a worldleading resource for all things emc and emi related. The purpose of test design techniques is to identify test conditions and test scenarios through which effective and efficient test cases can be written. In addition to test case generation, these tools specify the components of the software that are to be tested. Several tools known as test case generators are used for generating test cases. Definition of emc, emissions and immunity, emc and the product cycle, reliability aspects of emc, the decibel, interference in the time and frequency domain, coupling mechanisms, electromagnetic fields, near and far fields, differential and common mode cable coupling. This approach, also known as structure based test case generation, is used to assess the entire software code to generate test cases. Introduction, the physical basis of emc, circuit design and choice of components for emc, cables and connectors, filters and transient suppressors, shielding screening, printed circuit boards pcbs, electrostatic discharge esd, electromechanical devices and. This paper provides information about test case design activities, test analysis, quality risks, testing techniques, phases of test development. Pdf design and mitigation techniques for emc for functional.
Product design for emc emc training course tuv sud. If youre interested in mastering this subject, here is the course. Esd as an emi design problem in compliance magazine. This mechanism restricts the emissioninterference fromto the pcb withinoutside the boundary defined by the cage. Problems induced by emc disturbances need to be considered as early as possible in the design phase. Software test design techniques static and dynamic. Design test cases such that each possible outcome f o logi o each condition in each decision occurs at least once example.
Emc basics emi interference basics emc standards cispr11 cispr16 cispr22 fcc 47 part 15 emc design techniques emc compliance test with the need for emc compliance testing established as an accepted standard, any new products that are designed and manufactured today need to undergo compliance testing to ensure that they meet the required standards. It is intended as a reference manual for emc practitioners and designers, test engineers and consultants. Software testing techniques allow you to design better cases. Deriving test cases directly from the structure of a component or system. For general information about emc performances, please refer to application note an898. Software testing techniques help you design better cases. Good emc design techniques are not too difficult to implement if they are. Pdf pcb design techniques for lowestcost emc compliance. This course will focus on highlighting the various methods and techniques in designing test cases for both black box and white box testing. This element of the circuit design is important to ensure that the circuit can pass its emc test. Test cases are very important for any project as this is the first step in any testing cycle, and if anything goes wrong at this step, the impacts get extrapolated as you move forward in the software testing lifecycle knowing how to write good test cases is extremely important for you as a testing resource and believe you me, it doesnt take too much of your effort and time to write. An1015 application note software techniques for improvi ng microcontrollers emc performance introduction a major contributor to improved emc performance in microcontrollerbased electronics systems is the design of hardened software. We will first look at esd through the lens of the classic sourcepathvictim emc model.
Design techniques for emc part 4 shielding cherry clough consultants page 3 of 23 copper and aluminium have over 5 times the conductivity of steel, so are very good at stopping electric fields, but have a relative permeability of 1 the same as air. A test case can be added to multiple test suites and test plans. Introduces techniques for the design of electronic products from the emc aspects covers normalized emc requirements and design principles to assure product compatibility describes the main topics for the control of electromagnetic interferences and recommends design improvements to meet international standards requirements fcc, eu emc. The process of developing test cases can also help find problems in the requirements or design of an application. Top 10 emc design considerations page 2 of 4 see figure 1c. Software testing techniques use case testing youtube. Following are the list of black box test design techniques. If you continue browsing the site, you agree to the use of cookies on this website. This helps in delivering highquality software products and lowering maintenance costs, thus leading to more contented users. Test cases are designed for equivalence data class. Mar 26, 2017 test case design techniques are one of the important topics in software testing. Through effective software testing, the software can be examined for correctness, comprehensiveness, consistency and adherence to standards. Software test design techniques static and dynamic testing the importance of software test techniques. Divided into three major categories, test case design techniques are crucial verifications steps that are created to design a software or.
Top 10 emc design considerations page 1 of 4 by ashish kumar, product engineer sr and pushek madaan, applications engineer sr, cypress semiconductor corp. Applied safety science and engineering techniques asset. Therefore, to ensure optimum software development it is necessary to design test cases properly, using best design techniques. The turtle method of selecting emc commercial test software. Introduction, the physical basis of emc, circuit design and choice of components for emc, cables and connectors, filters and transient suppressors, shielding screening, printed circuit boards pcbs, electrostatic discharge esd, electromechanical devices. Tektronix emcvu precompliance software supports emc standards including cispr, fcc and milstd for many types of devices.
Learn how a military engineer passed their test using a connector insert. Test case design and testing techniques test design is an art that has interesting techniques associated with it, which make it effective and useful for testing. By using these techniques we could save lots of testing time and get the good test coverage. Black box test design techniques software testing material. In all other technical areas, including software, the achievement of sufficiently. The main purpose of test case design techniques is to test the functionalities and features of the software with the help of effective test cases. In this case both elements are required for proper maintenanceof the watchdog. Emc design for compliance emissions 24 hour online training course. Software test design techniques, static test design techniques, dynamic test design techniques, black box testing, white box testing and experance based testing. Jan 31, 2017 in this article, the focus is on esd as an emi design problem. You could find other testing techniques such as boundary value analysis, decision table and state transition techniques by clicking on appropriate links equivalence partitioning is. The following section introduces the most common emc phenomena in electrical system designs and the tests used to emulate them. Test case design techniques software testing class. Emc test can be passed by reducing the series resistance on the signal line 338 6.
Test case design techniques software testing lessons. All the design techniques described in the previous parts of this series help a great deal in improving the immunity of circuits to electric and magnetic fields, and so help circuits cope with the brief but intense bursts of wideband disturbances from esd events. A test case contains test steps, test data, precondition, postcondition developed for specific test scenario to verify any requirement. A test case is a set of conditions or variables under which a tester will determine whether a system under test satisfies requirements or works correctly. Software techniques for comprehensive emc testing of embedded. Also, having an emc analysis capability embedded within the pcb design cad tool can greatly reduce the risk of emc compliance failure once the board is manufactured. A test design technique is used to select a good set of tests from the all possible tests for a given system. In the worst case the whole picture could disappear, or there may be some patterning of the picture. He starts off with pages of terms and abbreviations for those unfamiliar with emc design. A test case is a set of conditions or variables under which a tester will determine whether a system under test satisfies requirements or works correctly the process of developing test cases can also help find problems in the requirements or design of an application. A more acceptable design technique would be to set the output highin the.
Emc design is a complex topic, but the proven best emc practices for generalised pcb layout can be fairly simply stated and grouped into five techniques, which interact with each other to give. Boundary value analysis is testing at the boundaries between partitions. The paper also, explains the factors that need to be considered while choosing the right testing techniques and provides a checklist of test cases based on our rich experience of testing mobile apps. After creating a test plan, test suites are created which in turn can have any. In case you are unaware of the turtle diagram process, the body of the turtle presents the. The test case includes specific variables or conditions, using which a testing engineer can compare expected and actual results to determine whether a software product is functioning as per the requirements of the customer.
Equivalence partitioning test case design technique. Software testing techniques with test case design examples. Software testing test case design techniques youtube. Components, software, and frequency jitter technique pages. It can take any of the three states namely active, inprogress and completed. To automate testing, emcvu provides a builtin standards table allowing you to choose the applicable standard for your product and the region it will be sold in. This note aims to provide guidelines for designers of microcontrollerbased applications so that the optimum level of emc performances can be achieved. Why the oscillator cannot be placed on the edge of the pcb 357. Test case design techniques archives software testing class. For detailed descriptions of the other emc management, design and construction techniques employed, including more on emzoning, see 4 and 5.
The turtle method of selecting emc commercial test software in. It considers only the actual software code to generate test cases and is not concerned with the user requirements. Correct choice of active and passive components, and good circuit design techniques used from the beginning of a new design and development project, will help achieve emc compliance in the most costeffective way, reducing the cost, size, and weight of the eventual filtering and shielding required. Jan 31, 2020 increased inhouse expertise, not just in test techniques but in appreciation of how emc behaves and can be tamed. I worked with several experts over a period of 6 months to create the most indepth online course on emc design for compliance currently available. Test case design techniques methods qai global institute.
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