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16. SPECIFICATIONS
Telescope
Length
DT-302/305/307/309F/309G: 149mm
DT-305L/307L/309LG: 152mm
Aperture 45 mm
Magnification 30X
Image Erect
Resolving power 2.5"
Field of view 1°30' (26 m/1,000 m)
Minimum focus
DT-302/305/307/309F/309G: 0.9 m
DT-305L/307L/309LG: 1.0 m
Reticle illumination Yes
Stadia ratio 100
Stadia constant 0
Angle measurement
Horizontal and Vertical circles type Rotary absolute encoder
Angle units Degree/Gon/Mil (selectable)
Minimum display
DT-302: 1" (0.0002 gon/0.01 mil)/5" (0.001 gon/0.1 mil) (selectable)
DT-305/305L: 1" (0.0002 gon/0.01 mil)/5" (0.001 gon/0.1 mil) (selectable)
DT-307/307L: 5" (0.001 gon/0.01 mil)/10" (0.002 gon/0.1 mil) (selectable)
DT-309F/309G/309LG: 10" (0.002 gon/0.05 mil)/20" (0.005 gon/0.1 mil) (selectable)
Accuracy
(ISO 17123-3: 2001)
DT-302: 2" (0.0006 gon/0.010 mil)
DT-305/305L: 5" (0.0015 gon/0.025 mil)
DT-307/307L: 7" (0.0022 gon/0.035 mil)
DT-309F/309G/309LG: 9" (0.0031 gon/0.049 mil)
Measuring mode
Horizontal angle: Right/Left (selectable)
Vertical angle: Zenith/Horizontal/Horizontal ±90°/% (selectable)
Tilt angle compensation (DT-302/305/305L/307/307L only)
Type: Automatic vertical compensator
Range of compensation: ±3' (±0.0555 gon)
Compensation constant: Can be changed (compensation is done at the same time with vertical
angle 0 point)
Laser-pointer
Signal source: Red laser diode (633nm) Class 2
(IEC60825-1 Ed.3.0:2014/FDA CDRH 21CFR Part 1040.10 and
1040.11 (Complies with FDA performance standards for laser products
except for deviations pursuant to Laser Notice No.56, dated May 8,
2019.))
Maximum output: 0.6mW
Beam accuracy: ±1 mm or less (Less than 20 m)
±10" (20 m or more)
Laser beam range: 50m (in daylight)
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