By Bernard S. Matisoff P.E., CMfgE (auth.)
The instruction manual of Electronics Packaging layout and Engineering has been writ ten as a reference resource to be used within the packaging layout of electronics equip ment. it truly is designed to supply a unmarried handy resource for the answer of re curring layout difficulties. the first attention of any layout is that the top product meet or exceed the appropriate product standards. The really apt use of uniform layout practices will detect the subsequent economies and kit advancements: • Economics of layout. Uniform layout practices will lead to much less engineering and layout instances and decrease bills. they are going to additionally lessen the variety of alterations which may be required as a result of negative reliability, maintainability, or producibility. • more desirable layout. higher designs with elevated reliability, maintainability, and producibility will end result from using uniform layout practices. • creation economies. Uniform designs utilizing average on hand instruments, fabrics, and components will lead to the fee regulate of producing. The guide is meant basically for the intense pupil of electronics packaging and for these engineers and architects actively engaged during this important and fascinating occupation. It makes an attempt to give electronics packaging because it is this day. it may be used as a coaching textual content for educational reasons and as a reference resource for the practising fashion designer and engineer.
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Extra info for Handbook Of Electronics Packaging Design and Engineering
Breadth and depth dimensions. the same direction. When a rotary control and a linear display are in the same plane, that part of the control adjacent to the display should move in the same direction as the moving part of the display. When levers are used, both the lever and the display pointer should travel through parallel arcs. When there is a direct linkage between a control and a display, a rotary control should be employed if the indicator moves through an arc exceeding 1800 • If the arc is less than 1800 , a linear control may be used provided that the path of control movement parallels the average path of the indicator movement, and the indicator and control move in the same relative direction.
57 HUMAN FACTORS ENGINEERING Table 3-10. Control Separation Criteria. Separation (Inches)* Control Condition Minimum Preferred One finger, random order One fmger, sequential order Different fingers, random or sequential order ! 1 'l 2 1 ! 5 2 S 'l Rotary selector switch One hand, random order Two hands, simultaneous 1 3 2 5 Continuous adjustment knob One hand, random order Two hands, simultaneous 1 3 2 5 Crank One hand, random order Two hands, simultaneous 2 3 4 5 Handwheel Two hands, simultaneous 3 5 Thumbwheel Onefmger 1 'l Lever handle One hand, random order Two hands, simultaneous Maximum simultaneous operation, one hand span 2 3 4 5 6 Pedal One foot, random order One foot, sequential order 4 2 6 4 Pushbutton Toggle switch 1 1 1 3 *Edge-to-edge measurement.
Be used only when labels are not critical to equipment performance or personnel safety and where space is severely limited. Labels should be placed on or very near the items that they ldentify to preclude confusion with other items or other labels. Whenever possible, the label should be located above the control to which it refers. The height of the letters and numerals to be used in a label should be determined by the required reading distance and illumination. Table 3-12 presents a range of values for the height of characters for use with a 28-in.