Theodolites

A Theodolite is a instrument for measuring both horizontal and vertical angles, as used in triangulation networks, and geo-location work. It is a tool used in the land surveying and engineering industry, but theodolites have been adapted for other specialized purposes as well. Other specialized purposes make Theodolites ideal for shop and factory floor layout of tools and fixtures. They also work well for layout for the construction of concrete slabs, swimming pools, golf courses, landscaping, and road design.the construction of concrete slabs, swimming pools, golf courses, landscaping, and road design.

The horizontal accuracy of Theodolites depends on “seconds”. A 2-second theodolite is more accurate than a 5 or 9-second theodolite. If you think about the horizontal circle that a theodolite rotates around, the circle is divided into 360 degrees. Each degree is divided into 60 minutes, and each minute divided into 60 seconds. Think “Degrees / Minutes / Seconds”. The horizontal angle is the measure of inaccuracy (hence accuracy) that a theodolite can horizontally measure or locate within. If a theodolites accuracy rating is 2 seconds (written 2″) then its only going to lose 2 seconds of horizontal measurement in a given distance. Generally speaking, a 9 second theodolite is for construction sites where you’re working relatively up close, say within 200 feet from the instrument. A 2 second you would work 2,000 feet away and still work with some level of accruacy. Most building contractors, whether residential or commercial, can use a 9 second theodolite without experiencing problems due to accuracy. At this distance, more errors are in the form of human errors, such as not leveling the instrument properly or taking a quick reading which lends itself to human error.

David White DT8-05P  5-Second Digital Theodolite, with Optical Plummet

Simple, push button functions gives the user precise LCD digital readouts.

  • Incremental encoding detection system with dual digital displays
    Automatic power shut-off
  • Optical plummet for centering of point
  • Coaxial tangent and clamp screws provide ease of use in sighting and alignment
  • Built-in battery pack can be attached and detached by a single action
  • Water resistant, sealed construction

Includes: instrument, sunshade, tool kit, rain cover, plumb bob, carrying case, rechargeable battery pack/charger, alkaline battery tray, user manual

Telescope

  • Objective aperture: 1.77 in (45 mm)
  • Magnification: 30X
  • Image: Erect
  • Field of view: 1° 30′
  • Resolution: 3”
  • Minimum focus: 53 in (1.3 m)
  • Stadia constant: 100

Electronic Angle Measurement

  • Angle measurement: Absolute Encoding
  • Minimum reading: 1” / 5”
  • Direction method: H. Both sides, V. Single side
  • Accuracy: 5”
  • Unit of angle: Deg / mil / gon / V%
  • Display: LCD both sides

Tilt Sensor

  • Automatic Compensation: Yes
  • Range of Compensation: +/-3’

Level Vial Sensitivity

  • Plate vial: 30” per 2 mm
  • Circular vial: 8’ per 2 mm

Other

Operating voltage, typical: 4.8 VDC
Batteries: 4 x 1.5V (AA)/Rechargeable Ni-MH
Operating Temperature range: -4 °F  to +122 °F (-20 °C to +50 °C)
Waterproof class: IP 54
Weight: 10.2 lb (4.6 kg)
Dimensions: 6.5 x 6.1 x 13.4 in  (164 x 154 x 340 mm)

David White DT8-05LP    5-Second Digital Theodolite, with Laser Plummet

Telescope

  • Objective aperture: 1.77 in (45 mm)
  • Magnification: 30X
  • Image: Erect
  • Field of view: 1° 30′
  • Resolution: 3”
  • Minimum focus: 53 in (1.3 m)
  • Stadia constant: 100

Electronic Angle Measurement

  • Angle measurement: Absolute Encoding
  • Minimum reading: 1” / 5”
  • Direction method: H. Both sides, V. Single side
  • Accuracy: 5”
  • Unit of angle: Deg / mil / gon / V%
  • Display: LCD both sides

Tilt Sensor

  • Automatic Compensation: Yes
  • Range of Compensation: +/-3’

Level Vial Sensitivity

  • Plate vial: 30” per 2 mm
  • Circular vial: 8’ per 2 mm

Other

Operating voltage, typical: 4.8 VDC
Batteries: 4 x 1.5V (AA)/Rechargeable Ni-MH
Operating Temperature range: -4 °F  to +122 °F (-20 °C to +50 °C)
Waterproof class: IP 54
Weight: 10.2 lb (4.6 kg)
Dimensions: 6.5 x 6.1 x 13.4 in  (164 x 154 x 340 mm)

 

SITEPRO  26-DT05 5-SEC DIGITAL THEODOLITE

  • Incremental encoding detection system with dual digital displays
  • Automatic power shut-off
  • Optical plummet for centering of point
  • Coaxial tangent and clamp screws provide ease of use in sighting and alignment
  • Built-in battery pack can be attached and detached by a single action
  • Water resistant, sealed construction

Package Content: Digital Theodolite/Transit, Sunshade, Tool Kit, Rain Cover, Plumb Bob, Carrying Case, Rechargeable Battery Pack/Charger, Alkaline Battery Tray, User Manual

SPECIFICATIONS

  • Magnification: 30X
  • Resolving Power: 3.5”
  • Field of View: 1°30’
  • Minimum Focus: 4.27-ft (1.3m)
  • Angular Accuracy: 5 Sec.
  • Minimum Reading: 1” / 5” switchable
  • Minimum Focus: 1.3m or 4.26ft
  • Stadia Ratio: 1:100
  • Tilt Sensor: Yes, ± 3’
  • Centering Plummet: Optical

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