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| What is Environmental Testing?
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To improve quality, the currently separate steps of "failure analysis", "environmental test planning", "environmental testing", and "test results analysis " should be unified into one common activity. However, at present due to such reasons as the large number of types of specimen and the complexity of evaluation technology, engineers engaged in individual research in each field carry out these steps separately. Because of this, the persons doing the testing rarely are aware of the purpose of the test or its effectiveness.
This series on environmental testing is for such persons as well as for those who have heard of "environmental testing" but aren't sure what it's all about.
Our greatest hope for this series is that each and every issue be enjoyed by such readers and that it lead to the ability to better carry out their duties. We are presenting "What is Environmental Testing?" and "Temperature Testing" as the first articles in the series, to be followed by "Humidity Testing" and "Temperature Cycle Testing". We hope you enjoy the articles.
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Fundamental Concepts of Environmental Testing Techniques in Electricity and Electronics
Part 1: Fundamental concepts of physics and chemistry regarding heat and humidity
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| This article is the first in a four-part series on basic issues concerning reliability quality control in electricity and electronics. The issues to be covered deal with "temperature and humidity testing", and are primarily directed toward beginning technicians who are participating in environmental testing.
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Guidance for accelerated testing and reliability
-For electrical and electronic parts and equipment- |
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| Resources are continually being poured into efforts to improve the reliability of electrical and electronic parts and equipment. This has lead to the production of a large number of highly reliable products, and brought about a sharp decline in failure rates. Concretely evaluating product reliability requires extremely long periods of time of environmental testing, specifically in the area of reliability testing. These time constraints have created a need for accelerated testing that can produce effective results in shorter periods of time. However, accelerated testing cannot be achieved by merely ratcheting up the stress to shorten testing times, and this type of testing is not applicable to every situation. Accelerated testing, just like other forms of reliability testing, is a reliable test method supported by scientific logic. In this report, we would like to present the logic behind accelerated testing in an easily understandable way, from the standpoint of environmental testing used in the fields of electricity and electronics.
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| Environmental testing and non-destructive failure analysis technology
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| This report will discuss failure analysis, and the methods of non-destructive failure analysis in particular, as used to improve quality by analyzing the occurrence of failures and providing feedback to the departments concerned. The report will also include some examples of testing and analysis.
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Combined environmental testing for equipment used on automobiles
-Overview and test approach- |
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| Automobiles face societal demands such as conserving energy, promoting recycling, and preventing pollution, while at the same time they must respond to purchaser desires for improved safety and greater comfort and convenience. The complex control systems employed to meet these demands can only be discussed in terms of car electronics. The continued development of vehicle electronic equipment has led to an age requiring diagnostic systems, serial data transmission control, and information displays as well as data transmission to navigational and other equipment inside and outside the vehicle. This burgeoning use of vehicle-mounted electronic equipment has led to a diversity of mounting environments, so that sometimes even when the environmental endurance of an individual part is well understood, the results could change when the equipment is actually mounted on the vehicle. Some mounting sites are within the relatively benign environment of the passenger cabin, but the majority of parts are used in harsher environments, such as outside in low temperatures, or subjected to the high heat and humidity and the mechanical vibration of the engine compartment. To maintain the rated safety and performance for the long term in the environments where the parts are actually used, combined environmental testing is carried out on electronic equipment mounted on many types of vehicles, as well as for the machinery built into the electronic equipment. In this article, I would like to present some examples of the approach of combined environmental testing in which temperature, humidity, and vibration are combined to create the environments in which the parts are presumed to be used in the vehicle.
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