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This not only prevents contamination, but it also helps to keep personnel morale at a higher level After all, we all desire to work in a nice, clean environment It will also serve as a positive point if visitors or possible customers visit the assembly area To prevent contamination from the human body, every individual must be aware of the possibility of contaminating the PCBA Printed circuits should be touched only on the edges away from any edge connectors prior to the soldering operation (see Fig 522) Where mechanical assembly procedures require a firm grip on the board, gloves or finger cots should be worn If the PCBA is to be conformal coated after the soldering operation, the handling of the assembly should be prevented In some cases, using finger cots, gloves, or fixtures can reduce the contamination.

Many producers utilize cleanliness testing to ensure that contamination levels remain within an acceptable range before the coating process, and to ensure adhesion and eliminate localized contaminants that could impact circuit operation and longterm performance J-STD-001 provides levels for cleanliness acceptability..

FIGURE 52.2 Appropriate method of handling board to avoid contamination and electrostatic discharger damage. Note position of fingers and the use of a grounding wrist strap.

Physical Damage Prevention Improper handling can damage components and assemblies. Typical defects associated with handling are cracked, chipped, or broken components; bent or broken terminals; scratched

In addition to listening to the words you speak, listen to the other sounds you make. Most inexperienced speakers should pay particular attention to nonwords like um, ah, and and. When someone uses ums and ahs, the sounds usually fall into patterns. Some people ll the pauses between sentences or words with an uhhh, often uttered in a long, drawn-out single tone. This almost sounds like singing and doesn t allow a break in the monologue. Other people use nonwords in a short staccato style in the beginning or middle of a sentence. Look out for the favorite phrases like and you know. These are common llers and may be acceptable in normal conversation among peers, but not in presentations. Some of us get into the habit of frequently and unconsciously repeating one phrase or word like actually, basically, or literally. Listen for this pattern while you watch yourself in a video. If a speaker has this habit, the audience stops hearing the presentation and starts counting the repeated phrase. To stop using nonwords, you need a video camera and a friend you trust. Watch your recording with your friend to hear your pattern. After you ve looked at your video, go back and rework the wording, and concentrate on improving any nonver-

board surfaces; damaged traces or lands; fractured solder joints; and missing surface-mount technology (SMT) components. Physical damage caused by handling can ruin assemblies and cause a high scrap rate of components or assemblies. Scrap is costly and must be avoided to achieve an efficient and high-quality operation. Well-maintained handling equipment is also very important in preventing physical damage. One good example is conveyor systems. PCBAs can be caught in conveyors and damaged beyond rework or repair capability and, unless the area of operation is staffed, the conveyor system can damage many assemblies in a very short period of time. Care must be taken during assembly and acceptability processes to ensure product integrity at all times. The following guidelines provide general guidance:

In addition to the arguments we have described here, Einstein used results that came out of Faraday s law and the studies of electromagnetic induction to come up with ideas about relative motion. We won t discuss those here, but the interested reader is encouraged to explore the references for details. The history of the discovery of the special theory of relativity is a good lesson in the way science works for it demonstrates the crucial interplay between theory and experiment. Careful experiments within the limits of technology available at the time led to Ampere s law and Faraday s law. Later, purely mathematical arguments and theoretical considerations were used to show that Ampere s law was only approximately correct and that electromagnetic waves travel through space at the speed of light. More theoretical considerations were put forward to explain how those waves traveled through space, and then the dramatic experimental result found by Michelson and Morley forced those ideas to be thrown away. Then Einstein came along and once again used mostly theoretical arguments to derive special relativity. The bottom line is this: Physics is a science that depends on two legs theory and experiment and it cannot stand on either alone. We now turn to a quick tour of the basics of special relativity, and begin with some de nitions.