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20-2
20 SPECIFICATIONS
Distance measurement
Measurement range
Condition 1: Sight haze with visibility about 20km (12.5miles) moderate sunlight with light heat
shimmer.
Condition 2: No haze with visibility about 40km(25 miles), overcast with no heat shimmer.
Measurement accuracy
Fine measurement mode : ±(2mm + 2ppm × D) m.s.e.
Coarse measurement mode : ±(10mm + 2ppm × D) m.s.e.
D : Measuring distance (mm)
Least Count in Measurement
Fine measurement mode : 1mm (0.005ft.) / 0.2mm (0.001ft)
Coarse (1mm) measurement mode : 1mm (0.005ft.)
Coarse (10mm) measurement mode : 10mm (0.02ft.)
Measurement Display : 10digit : max. display ±999999.9999m
Measurement Time
Fine measurement mode : 1mm : 1.2 sec. (Initial 4 sec.)
: 0.2mm: 2.8 sec. (Initial 5 sec.)
Coarse (1mm) measurement mode : 0.7sec. (Initial 3sec.)
Coarse (10mm) measurement mode : 0.4sec. (Initial 3sec.)
(The initial time will be different by a condition.)
Atmospheric Correction Range : –999.9ppm to +999.9ppm , in 0.1ppm increments
Prism Constant Correction Range : –99.9 mm to +99.9 mm , in 0.1 mm increments
Coefficient Factor : Meter / Feet
International feet 1meter = 3.2808398501 ft.
US SURVEY feet 1meter = 3.2808333333 ft.
Ambient Temperature Range : –20°C to +50°C (–4°F to +122°F)
Electronic Angle Measurement
Method : Absolute reading
Detecting system : Horizontal : 2 sides
Vertical : 2 sides
Minimum reading
GTS-821A : 1"/0.5" (0.5mgon/0.1mgon, 5mmil/2mmil) reading
GTS-822A : 1"/0.5" (0.5mgon/0.1mgon, 5mmil/2mmil) reading
GTS-823A : 5"/1" (1mgon/0.2mgon, 20mmil/5mmil) reading
GTS-825A : 5"/1" (1mgon/0.2mgon, 20mmil/5mmil) reading
Accuracy(Standard deviation based on DIN 18723 )
GTS-821A : 1" (0.3mgon )
GTS-822A : 2" (0.6mgon )
GTS-823A : 3" (1mgon )
GTS-825A : 5" (1.5mgon )
Diameter of circle : 71mm
Prism
Atmospheric conditions
Condition 1 Condition 2
Mini prism 800m ( 2,600ft) ----
1 prism 2,200m (7,200ft) 2,500m (8,200ft)
3 prisms 2,800m (9,200ft) 3,200m (10,500ft)
9 prisms 3,600m (11,800ft) 4,200m (13,800ft)