Ergonomics

Ergonomics

Ergonmic Checklists - Visual Displays and Dials

Legibility:
  • Can the required data be obtained from display quickly with the required accuracy?
  • Are the scales correctly graduated and are as simple as possible; not giving needless or spurious accuracy?
  • Do the letters, numbers, graphics and markings conform to the relevant standards in relation to the required reading distance; is the required reading distance different from the normal reading distance?
  • Are pointers and other indicators simple and clear, and do they allow numbers to be read without obstruction?
  • Are pointers mounted so that the visual parallax is minimized?
  • Have great differences in brightness between displays, dials and surroundings been avoided?
  • Is the legibility of the display impaired by reflection of light sources?
  • Is the legibility of dials impaired by bright lights visible within the same area of vision?
  • Has shadowing by pointers, edges, or controls been avoided?
  • Does the chosen numerical progression minimize reading errors?
Grouping:
  • Is it possible to group the different categories of dials and displays in different planes or surrounds of mounting?
  • Can groups of displays of a specific category be divided by area or color patterning; are the layouts of displays so contrived as to highlight when the normal changes to abnormal?
  • Are displays located near to their corresponding controls?
  • Have the most important and/or the most frequently used instruments the best position in the normal visual field?
  • Are the most frequently used instruments grouped together in one and in the same area of the visual field?
Positioning:
  • Is the positioning of controls on similar machines or displays correctly standardized?
  • Does reading of instruments require undue movement of head and/or body?
  • Is the location and size of the display correct in regard to sitting posture, arm reach and viewing direction?
Accuracy and speed:
  • Is the accuracy of the instrument compatible with the required reading accuracy?
  • Are reading errors minimized by the design of the instrument?
  • Is the time lag between changes in the system and indication of it in the display minimized as far as possible?
  • Are digital displays used for accurate reading and for adjusting to a predetermined value?
  • Is a moving pointer display used for estimation of the degree of deviation and for adjusting deviation?
  • Is the dial as simple as possible in regard to the desired information; can colored zones (e.g. red, amber, green) be used instead of numbers and markings when only check information is required?
  • Is a satisfactory signal used to indicate the breakdown of a measuring instrument; and is the knock-on effect whereby several alarms may occur simultaneously avoided in favor of the most important?
Conformity:
  • Does the grouping and arrangements of displays conform to the required reading sequence?
  • Do pointers and other graphics point in the same direction when equipment is working correctly?
  • Does the direction of the movement display have a similar meaning in different displays? Is the positioning of displays in different colors the same where these panels serve a similar purpose?
Controls:
  • Is it possible to see immediately which situation is indicated by the position of the control?
  • Does the controlling hand impede the reading of the dial?
  • Is it possible to indicate the zero position by a stop?
  • Is it possible to recognize controls or visual graphics by means of differences in shape, color or size?

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