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Electronic Total Station

Auto tracking total station GTS-820Aseries

GTS-820A

The GTS-820A series inherits the functions and operability of the GTS-810A series and incorporates the CCD tracking system. Tracking speed, accessible distance and search operation drastically improved. The new tracking system and area CCDs quickly seek the prism center to improve detection sensitivity.

Product features

Very fast auto tracking speed.

Model	GTS-810A	GTS-820A
Auto tracking speed	10°/sec	12°/sec

Longer tracking distance

Model	GTS-810A	GTS-820A
Auto tracking range	700m	800m

<Specification>
Model	GTS-821A	GTS-822A	GTS-823A	GTS-825A
Telescope
Length	166mm
Objective Lens Dia.	50mm
Magnification( × )	30 ×
Image	Erect
Field of View	1°30′
Resolving Power	3″
Min. Focus Distance	1.3m
Distance Measurement
Measuring Range 1 Prism 3 prism 9 prism	2,200m 2,800m 3,600m
Condition: Sight haze with visibility about 20km moderate sunlight with light heat shimmer.
Accuracy Fine measurement mode Coarse measurement mode	±(2mm+2ppmxD) m.s.e. ±(10mm+2ppmxD) m.s.e.
Least Count Measurement Fine measurement mode Coarse measurement mode	1mm/0.2mm 10mm/1mm
Measurement Display	10 digits: max. display ±999999.9999
Measuring time Fine measurement mode Coarse measurement mode	1mm: Approx. 1.2 sec. (Initial 4 sec.) 0.2mm: Approx. 2.8 sec. (Initial 5 sec.) 10mm: Approx. 0.4 sec. (Initial 3 sec.) 1mm: Approx. 0.7 sec. (Initial 3 sec.)
Angle Measurement
Method	Absolute reading
Horizontal/Vertical	2 sides/2 sides
Minimum reading	0.5″ /1″ (0.1 / 0.5mgon)		1″ /5″ (0.2 / 1mgon)
Accuracy**	1″ (0.3mgon)	2″ (0.6mgon)	3″ (1mgon)	5″ (1.5mgon)
Diameter of circle	71mm
Servo Mechanism
Driving Range	All range rotating
Coarse movement	Shuttle control
Fine movement	Jog Control (Min. 1 sec)
Max. Rotating Speed	50° / sec
Auto Tracking
Max. Auto Tracking Speed	12° / sec (Max. trackable speed/100m : 76km/h)
Search Range	User definable
Auto Tracking Range Prism unit type A3/A3s Prism 2	10m to 500m 8m to 800m
Collimation Accuracy	3″ (Standard deviation of repeatability)
Laser safety	Class 2
Tilt Correction
Type	Dual axis
Method	Liquid type
Compensating range	±4′
Correction unit	1″ (0.1mgon)
Computer unit
OS	MS-DOS® ver.3.22
Internal memory System memory Program memory Main memory Application program & Data memory	FEEPROM 512KB FEEPROM 1MB SRAM 640KB FEEPROM 4MB
Display	Graphics LCD 40 characters × 10lines (240 × 80 Dots) w/backlight heathr
Calendar clock	Provided
Card system (Type I/II)	PC Card Standard 95 Max./32MB 5.0V Surveying data (Dist, Ang, Coordinate) Setting out coordinate, AP software
Interface
Serial I/F	RS-232C
Parallel I/F	For printer: Centronics Standard (12 pin)
Other
Instrument height	196mm
Level sensitivity Circular level Plate level	10″ / 2mm 30″ / 2mm
Optical plummet Magnification Focusing range Image	3x 0.5m to infinity Erect
Point Guide/Tracking indicator	Provided
Dimension	211(L)×229(W)×325(H)mm
Weight Instrument(with battery) Plastic Carrying Case	7.7kg 5.4kg
Durability Dust/Water protection Ambient Temperature Range	IP54 -20°C to + 50°C

*D : measuring distance (mm)
** : Standard deviation based on DIN18723

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