What is a tribrach used for?

A tribrach is an attachment plate used to attach a surveying instrument, for example a theodolite, total station, GNSS antenna or target to a tripod.

What is tribrach adjuster?

Use this tool for checking and adjusting optical plummet tribrachs & tribrach bubbles. The adjuster is constructed of precision-machined anodized aluminum with a 2-minute bubble. Weighs 1.3 lb (0.59 kg)

What are optical and laser plummets used for?

Widely used in construction and industry installations, engineering inspections and distortion observations as well as many other engineering and surveying worksites.

What is an optical plummet?

A device on some transits and theodolites; used to center the instrument over a point, in place of a plumb bob, which moves in a strong wind.

Why do surveyors use theodolites?

The theodolite is an instrument that can measure both horizontal and vertical angles, which allows surveyors to “triangulate” the position of objects in a specific area.

How do I adjust my optical plummet Trimble?

Remove target turn 120° and do again, repeat for a full rotation. Now you look though the optical plummet, if off the point, adjust it halfway back. Remove and rotate the target 120° and redo, adjust halfway back, do 2 more times for a full circle. Your last adjustment should be very small or nil.

What is laser plummet?

Laser plummets provide precise and prompt positioning over a point using a focused laser dot, visible even in bright sunlight with a bright 635nm diode (Class II) with 3 element glass lens.

Are theodolites still used?

Though rarely used nowadays, the theodolite was the predecessor of modern survey instruments. It measures angles in the horizontal and vertical planes, and can be very accurate.

How do you calibrate Trimble?

To calibrate point coordinates

  1. Enter the grid coordinates of your control points.
  2. Place the calibration points around the perimeter of the site.
  3. Measure the points with GNSS.
  4. Perform an automatic or a manual calibration.