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

April 3, 2017 | Manufacturing Operational Systems | By admin | 0 Comments

By B. Shackel (Auth.)

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Sample text

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. If the user has to make a particular setting, then he must be able to see when he has achieved it, and to make a quick visual check at any time.

9 a and b). The familiar positions are easily read, and the user can set the switch accurately even without looking. Of course, controls do not always act as displays. For instance, people watch the screen, not the knob, when adjusting the brightness of an oscilloscope, or a television set. In this case, a round knob makes continuous adjustment easier. Indeed, a pointer shape might give the false impression that there were definite settings to be adhered to. 10 This range of shaped control knobs is the result of research into recognition by touch.

Displays, such as dials and indicators, and controls, such as levers, wheels or panels of switches, are often so numerous that only a few of them can be placed in the most accessible positions. Others may have to be placed in areas which are only just within the reaching and seeing limits of some users. The following examples show how easy it is to overlook some of the less obvious requirements for reaching and seeing and how difficult it can be to cater for many activities and many body sizes in one work space.

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