With 5-second accuracy, the Sokkia DT540 Digital Theodolite provides precise angle measurements for construction and layout applications. This optical instrument ensures that the target is accurately measured with its built-in absolute encoder, automatic axis compensation, 30X magnification and 2.5-inch resolving power for crystal clear images of points.
Dual-Axis Compensator
The DT540 digital theodolite automatically compensates both vertical and horizontal angles by monitoring the tilt of the instrument in two directions.
Enhanced Reliability
With the integrated absolute encoder, surveyors can start taking measurements as soon as the power is turned on. Absolute encoder’s new algorithm remarkably reduces power consumption by restoring the azimuth after the instrument is turned off or restarted.
Different Display Modes
Select the angle display unit that best suits you. Horizontal angle is switchable between clockwise and counterclockwise, angle hold and zero-set functions are also provided.
Audio Notification for Right-Angle
Once the zero horizontal angle direction is determined, the DT540 survey instrument emits audible tones for each of the four right-angle directions. Specifically, it sounds two different tones within ±15 degrees of 90 degrees and stops beeping when it comes within ±1 degree.
Easy to Use Control Panel
For added convenience, this Sokkia theodolite features a simple 4-key operation, dual and an integrated reticle illuminator that provides clear angle readings and allows construction professionals to work under all lighting conditions. Field data can also be transferred to external devices via the RS-232C serial port.
Rugged with Long Battery Life
The Sokkia DT540 withstands the harshest jobsite environment with its IP-66 rating for dust and water protection. Powered by four standard AA alkaline batteries, this survey tool operates up to 140 hours and works for two to five weeks without changing batteries depending on usage.
This Sokkia theodolite package comes with a hard carrying case, lens cap, plumb bob, tool pouch, vinyl cover, cleaning cloth, batteries and 1-year manufacturer’s warranty.
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- Measures horizontal and vertical angles
- 5-second accuracy
- 2.5-inch telescope resolving power
- Dual-axis compensator automatically corrects tilt errors
- Absolute encoder
- Reticle illumination for good viewing in low light conditions
- Audible right-angle notification
- Optical plummet
- Detachable tribrach
- RS232C serial port
- Water resistant and dustproof to IP-66
- Dual backlit LCD display
- Up to 140-hour battery life
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Technical Specification
Telescope Image Erect Magnification 30x Diameter of Objective Lens (Aperture) 1.8 in (45 mm) Focus Distance 3 ft (0.9 m) Field of View 1 degree 30′ Ratio of Stadia Lines 100 Resolving Power 2.5-inch Length of Tube 5.9 in (149 mm) Reticule Illumination yes Optical Plummet Image Erect Magnification 3x Field of View 3 degrees Focus Range 1.64 ft (0.5 m) Angle Measurement Display 1″/5″ (0.2/1mgon) Accuracy 5-second Circle Diameter 2.8 in (71 mm) Measuring Method/Reading System Absolute rotary encoder scanning Detection Method Horizontal: diametrical; vertical: single Level Plate/Tubular Bubble Vial 40 seconds/2 mm Circular Bubble Vial 10 minutes/2 mm General Weight 9.0 lbs (4.1 kg) Warranty 1-year Dimensions 7.4 x 5.9 x 12.3 in (18.8 x 14.9 x 31.3 cm) Protection Class IP-66 (dustproof and protection against water jets and heavy seas) Tribrach Detachable Battery/Power Power Source 4 x LR6/AA batteries Battery Life 140 hours Battery Life Alert yes Applications 90-Degree Layout yes Checking Angles yes Alignment and Plumb yes Short-Range Leveling yes General Construction yes Anchor Bolt Positioning yes Steel Column Placement yes Setting Elevations yes Setting Lines yes Basic Grade Work yes Display and Keypad Type LCD, 7 digits x 2 lines Sides Dual Backlight yes Temperature Operating -4°F to +122°F (-20°C to +50°C ) Tilt Sensor/Compensator Range ±3′ (±55mgon) Interface Pin Port RS-232C 
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