Applied Ergonomics Handbook. Volume 1 by B. Shackel (Auth.)

By B. Shackel (Auth.)

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One of the worst features of television design has been the tendency to group many of the conti ols at the back of the receiving set (which is usually relatively inaccessible anyway), so that during adjustment it is extremely difficult, if not impossible, to see the effect of the control movement. Ideally, such controls should be placed close to the appropriate indicator, and move in the direction which the majority of people would expect. For example, it is conventional in this country for toggle switches to be 'off when up and 'on' when down (in the USA, the reverse is the case).

These data are available in the standard textbooks (see general references at the end of Chapter 3). Optimum sizes can be specified for various types of control. In the case of knobs, the larger diameters are generally more suitable for sensitive control, and small knobs should be reserved for non-critical adjustments (see the Appendix 'Choosing control knobs'). Similarly, there are optimum operating forces for toggle switches, push-buttons and a variety of control knobs. 15). Visual characteristics Often controls are also displays.

4. A fairly wide range of positions for any one piece of equipment can usually be tolerated without discomfort by one size of user. The tolerance range for a person of a different size may be equally wide. But these ranges do not coincide. Usually there is only a small overlap, and sometimes there is no overlap, in which case the equipment will have to be made either in several sizes, or adjustable. 2 46 Distribution of heights of a user population Applied Ergonomics Handbook f\*—9°°f°—A /' y · i\ !

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