Electronic Digital Theodolite ET-20/ET-20L

Telescope
Image : Erect
Magnification : 30 X
Effective aperture : 45mm
Resloving power : 3"
Fiel of view : 1"30'
Minimum Focusing Distance : 1.4m
Stadia constant : 0
Tube leight : 157m

Anggle Mensurement
Reading system : Photoelectrick detection by incremental enconder
Diameter of circle (VHz) : 79mm
Minimum reading : 10" / 20" (selectable)
Accuracy : 5"
Horizontal angle : Dual
Vertical angle : Single

Display
(LCD) Display type : 2 sides, segment LCD in two lines
Data OUTPUT
Data I/O : RS-232C

Level Sensitivity
Plate level : 30"/2mm (30"per 2mm)
Circular level : 8'/2mm (8' per 2mm)

Auto Vertical Compensator
System : Liquid-electric detention/plate level selectable
Working range : ±3'
Accuracy : 1" (Liquid-electronic detention) 30"/2mm (plate level)

Optical Plumment Telescope
Image : Erect
Magnification : 3X
Focusing range : 0.5m-
Fiel of view : 5°

Physical Characteristics
Operating temperature : -20°C - +45°C
Internal power supply : Rechageable Ni-H battry/AA battery
Voltage : 6VDC
Operating time : 10 hours
Dimension : L 145 x H 318 x W 179mm
Weight : 5.2Kg