F09SESS21 6s0 - IE/PSY 577 Flash rate Session 21 IE/PSY 577...

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1 IE/PSY 577 Session 21 Warning Lights and Dynamic Visual Displays 2 IE/PSY 577 Session 21 Recommendations Regarding Signal and Warning Lights When should they be used? To warn of an actual or a potential danger condition How many warning lights? Ordinarily only one 3 IE/PSY 577 Session 21 Recommendations Regarding Signal and Warning Lights Steady state or flashing? If the light is to represent a continuous, ongoing condition, use a steady-state light unless the condition is especially hazardous To represent occasional emergencies or new condition, use a flashing light 4 IE/PSY 577 Session 21 Flash rate If flashing lights are used, flash rate should be from about 3 to 10 per second (4 is best) with equal intervals of light and dark. If different flash rates are to represent different levels of some variables, use no more than three different rates. 5 IE/PSY 577 Session 21 Warning-light intensity The light should be at least twice as bright as the immediate background. Location The warning light should be within 30° of the operator’s normal line of sight. 6 IE/PSY 577 Session 21 Color Warning lights are normally red because red means danger to most people Size Warning lights should subtend at least 1° of visual angle.
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2 7 IE/PSY 577 Session 21
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This note was uploaded on 11/04/2010 for the course IE / PHYS 577 taught by Professor Ng during the Fall '08 term at IUPUI.

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F09SESS21 6s0 - IE/PSY 577 Flash rate Session 21 IE/PSY 577...

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