DOCUMENT

SPEC - Self-Leveling Level 2002

  • YEAR CREATED: 2002
  • ENTITY TYPE: Authority: Transportation
  • TYPE OF DOCUMENT: SPEC - Specification
The document is a specification for a self-leveling engineer's level, as required by the Louisiana Department of Transportation and Development. The level is expected to have a minimum accuracy of 0.006 ft./mile for two-way leveling. It should have a telescope with internal focusing, an erect image, and an automatic 2-speed mechanism for fast and slow focusing. The level should also have a self-dampened compensator that automatically levels the line of sight. Additional specifications include a minimum focus of 11 feet, a minimum magnification of 30X, and a resolving power of 3.0 seconds of arc. The level vial should be circular and bullseye-shaped for rough leveling, and an observation prism should be attached to the telescope for viewing the circular level vial horizontally at the normal operating height. The level should have three fully enclosed leveling screws with a fast lead for rapid leveling. It should weigh approximately 6 1/2 pounds and have a glass reticule with crosshairs and stadia lines at a fixed ratio of 0.3:100 for 3-wire leveling. The eyepiece should have a reset scale and a spiral focusing mechanism, and the field of view should be a minimum of 1 degree 18 minutes. The level should come complete with a carrying case, sunshade, accessories, and a manual. It should also be furnished with a tripod with wide frame and fixed legs, approximately 63 inches in length and weighing approximately 11 pounds. The document also mentions an acceptable products list, which includes the Wild NA2, Zeiss NIZ, Lietz B 1, and Topcon AT-G3. The Louisiana Department of Transportation and Development reserves the right to reject any or all instruments that do not meet the specified requirements.
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