Electronic theodolite: the telescope is fixedly connected with the vertical plate, mounted on a support instrument optical theodolite low sales, this part is called the alidade, belonging to the upper part of the instrument. Telescope along with rotation of the vertical plate is rotatable about a horizontal axis in a vertical plane, the telescope should be horizontal collimation axis orthogonal to the horizontal axis through the water tray should portray center. Internal (Sight portion of the rotary shaft) into the base of the instrument sleeve axes sighting portion sighting unit can rotate horizontally theodolite, measuring horizontal and vertical angles of the instrument; angle measurement principle is based on the design. The most commonly used is an optical theodolite. Depending theodolite theodolite dial scale and reading methods, into cursor theodolite, optical theodolite and electronic theodolite. At present, China mainly uses optical theodolite and electronic theodolite, theodolite cursor already eliminated. Electronic theodolite theodolite theodolite electronic theodolite DT-02L Telescope Image Erect Magnification 30x Effective aperture 45mm Resolution 3 'FOV 1 ° 30' Minimum sight distance 1.4m Stadia multiplication constant 100 Stadia constant 0 Tube length 157mm Angle section goniometer way absolute encoder encoder disk diameter 79mm Minimum reading 1 'Accuracy 2' diameter detection method for the vertical angle of the horizontal path Vial Vial 30 "/ 2mm circular level 8 '/ 2mm Automatic Vertical Compensation System Liquid electronic sensors: 4 'working range ± 3' precision liquid electronic sensors: 1 "laser plummet (DT-02L / 02CL / 02NL / 02LN applicable) Wavelength 635nm Power 0.5mW focus point mode Focus 120m effective range physical Characteristics Ambient temperature -20 ℃ ~ + 45 ℃ onboard battery rechargeable Ni - MH battery / AA Battery continuous operation time of 10-hour electronic theodolite principle structure | Theodolite | Branch instrumentation provided by the Qingdao Branch of the Instrument Co., Ltd. Qingdao Branch of the Instrument Co., Ltd. (www.qdjk17.com) strong, credible, in Qingdao, Shandong analytical instruments industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Jinke instrument into the brilliant and you work for a better future!