Leica AT402 Absolute Laser Tracker is the most portable 3D Absolute Tracker for traditional inspection tasks or for fully guided measurement processes. It is able to be powered by its own internal battery and is able to work in the most demanding environment, yet maintains the highest level of precision and the largest ever work envelope.

The Leica AT402 features increased ruggedness and extended battery life. The Leica Absolute Tracker AT402 has a unique “All in One” system design that incorporates such needed accessories as built-in live video, level to gravity, environmental monitoring and even an integrated IR remote control. By utilizing the integrated WiFi access point functionality the sensor can be used completely wirelessly.

The updated Leica AT402 can perform measurements without a warm-up period. This allows the operator to switch the system directly out of the box and start measuring within seconds. The 1.1 firmware also includes such specialized features as “Outdoor Mode” which enhances the performance of the system when using it in adverse conditions like rain or snow. Enhancements also include the use of several reflectors in view of the sensor at the same time.

The built-in WiFi on the AT402 can now be used in a company’s encrypted WiFi infrastructure even with several sensors in the same network. Finally, the 1.1 firmware further facilitates the user compensation of the sensor making an already simple task even easier.

Leica AT402 Benefit

• IP54 sealed – Dust and Waterproof. Independently certified IEC 60529 usage in even the most demanding conditions.
• Integrated environmental monitor – Automatic reading and updating of the environmental parameters avoids inaccurate calculations or wrongly input values.
• Cable-less design – By combining built-in WiFi connectivity and onboard battery power, the sensor can operate without any wires connected at all.
• Hot-swappable battery operation – No need to worry about AC (mains) power – the sensor can run continuously with a new set of batteries able to be swapped in without interruption
• Automatic target recognition (ATR) – The ATR allows constant tracking and fine positioning with different reflector types to a typical radial volume of 320 m.
• PowerLock beam recovery technology – No need to worry about ”breaking the beam”: the tracker automatically locks onto the user providing up to 20% time savings over traditional laser tracker technologies
• Proven Absolute Distance Meter technology – The most accurate Leica Geosystems distance meter ever: The ADM has a resolution of 0.1 microns and a maximum uncertainty of 10 microns over a full 160 m radial volume.
• Quick Release tribrach and precision level to gravity sensor – A built-in ”survey grade” level to gravity sensor is combined with a simple three-screw leveling quick release platform for quick and easy machine setup and relocation.
• Overview Camera – Integrated Overview Camera to allow on-line steering of the laser tracker for remote or fixed installations
• Extreme Portability – Extremely light and compact: 8.1 kg incl. controller, just over 290 mm tall Measuring where no other laser tracker can go. The controller stays out of the user’s way, e.g. attached to the tripod.
• Leica Geosystems proprietary quadruple reading absolute angle detection system – The absolute angle encoders provide traceable ISO 17123-3 0.5” accuracy with a 0.07” resolution guaranteeing system accuracy over extremely long ranges.
• Power Over Ethernet – Due to its low power requirements the sensor can use POE+ technology that combines power and data into a single off the shelf Cat5 LAN cable.

Leica AT402 Absolute Key Feature

Portability

The measuring system in a minimum set, including the case for transporting and storage, weighs less than 15 kg. Dimensions of the case lets you carry it not only in the car, but even in the luggage compartment of the aircraft.

Working in difficult conditions

Due to the tightness of design of the measuring system, regardless certified by IP54 (IEC 60529), Leica laser trackers can operate in harsh environments. The system maintains high accuracy during measurement of the coolant spray conditions, high humidity and dust, near welding and metal-cutting equipment, etc.

Absolute Tracker Leica AT402 – this is the first laser tracker certified for outdoor use, even in rainy weather.

PowerLock Technology

In 2009, the company Leica Geosystems introduced for the first time ever the term PowerLock. PowerLock is a technology based on vision system that provides automatic detection of the reflector and pointing at him a laser beam. The system provides a well-directed hit of the beam, even in a moving target. Moreover the laser beam is directed only to the reflector without affecting the other objects.

Until the introduction of this technology work with the laser tracker, the work has always been complex and obscure for the operator. The operator had to spend excessive time on gaining experience for effective use of the tracker without interrupting the beam. Application of PowerLock technology significantly reduces operator´s training time and simplifies the tracker.

Wireless concept

In order to ensure autonomous power measurement system, is used two identical batteries, one for the power supply of the tracker and the other to power supply of controller. When running on battery tracker is capable of performing measurements during a work shift. With decreasing of battery power to a critical level, the batteries can be replaced both with system shutdown and without disruption. In any case, the laser tracker will carry out its tasks without failures after replacing the battery.

Built-in wireless data interface of Wi-Fi allows you to get rid of connecting cables and this gives full freedom of action for operator.

Measurement of large objects

Vision angle of tracker Leica AT402 is full horizontal 360 °, Vertical – 290 °. Given the maximum range – 160 meters and high accuracy, can be considered the laser tracker like measurement machine with an incredibly large measuring range.

Volumetric accuracy (Uxyz)

Measurement error (Uxyz) is defined as the deviation of the measured coordinates from the nominal coordinates. Fault of measurement depends on the distance between the laser tracker and the measured point.

For absolute laser tracker Leica AT402 volumetric fault is ± 15 mm + 6 mm/m.

All of these errors in the measurements was obtained using the 1.5″ reflector (1.5″ Red Ring Reflectors) in standard mode with test point pace of 2 seconds on measurement point and at stable ambient conditions. Measurements were conducted in the linear range of from 1.5 to 80 m and an angular range of ± 45° vertically and 360° horizontally. 

Dimensions and weight

• Dimensions of measuring unit in mm: 290×221×188;
• Weight of measuring unit, kg: 7.3;
• Controller´s Dimensions in mm: 250×112×63;
• Weight of controller kg: 0.8.

Measuring range

• The rotation in the horizontal plane: ± 360 °;
• Rotation in the vertical plane: ± 145 °;
• Linear range, m: 160.

Terms of use

• Degree of protection: IP54 (IEC 60529);
• Operating Temperature, ° C: from 0 to 40;
• Permissible humidity: 95% (non-condensing);
• Permissible height above sea level, m: from – 700 to + 5500.

Properties of a drive measuring unit

• Acceleration: 360°/sec2;
• Rotation speed: 180°/sec;
• Vision angle of PowerLock: 10 °.

The absolute angular characteristics

• Angular resolution, arcseconds: 0.07;
• Maximum error: ± 15 m + 6 m / m;
• Repeatability: ± 7 mm + 3 mm / m;
• Precision tilt adjustment, arcseconds: ± 1.

Absolute linear characteristics

• Accuracy grade, m: 0,1;
• The maximum error, m: ± 15;
• Repeatability, mm: ± 5;

Laser radiation

• Class 2 (in accordance with IEC 60825-1);
• The second edition (2007-03);

General characteristics

• Viewfinder: Camera 4:3 IR with improved image and a viewing angle of 10°;
• Meteostation: humidity, temperature, pressure, and temperature of the object;
• Remote control: infrared;
• Connectivity: wired (TCP / IP Cat5), wireless (WLAN IEEE 802.11g);
• Power supply: built-in lithium-ion battery, AC adapter, power supply for Ethernet (PoE +).

Leica B-Probe

Leica B-probe – an additional means of measuring for laser tracker Leica AT402. It is a contact probe with wireless transmission of data. Due to the extension of the probe it can be operated in the holes.

Leica AT402 Specifications

• Radius, m: 10;
• Measurement error (Uxyz), mm: ± 0,2;
• Time of continuous work, hours: 6.
• Probe length, mm: 150;
• Degree of protection: IP50.

Leica AT402 include

• (1X) Leica AT402 Head Unit
• (1X) AT402 Tracker Controller
• (3X) Battery 1 and 2
• (1X) Battery Charger Power Supply
• (1X) AT402 Remote Control
• (3X) Battery Charger 1 and 2
• (1X) Velcro tripod clip for tracker controller to attach to a tripod
• (1X) Dust covers and luggage straps
• (1X) LAN Ethernet cable
• (1X) Y-cable for basic charger
• (1X) External temperature sensor
• (1X) Tracker/controller communication cable
• (1X) Cigarette lighter power cable
• (1X) Inspection certification
• (1X) 1.5” RR
• (1X) AT28 Tripod
• (1X) AA battery charger
• (1X) Battery charger outlet adapters
• (1X) B-probe compensation tool
• (1X) B-probe
• (1X) Cigarette lighter power cable
• (1X) Tracker Unit transit case (large)
• (1X) Tracker Unit transit case (small)

Leica AT402 brochure