1. CMM AT401 Laser Tracker

Leica Absolute Tracker - AT401

The leica absolute tracker at401 is a portable coordinate measuring machine that allows extreme precision over ultra large distances.

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 absolute tracker AT401 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 Wireless LAN communication, the sensor can be used completely wirelessly making this the most portable absolute tracker ever.

All accuracies are specified with leica geosystems precision 1.5” red ring reflectors (delivered with each sensor) and a measurement mode of 2 seconds per point under stable environmental conditions.
Full range is specified as 1.5 to 80 meters away from the laser tracker within a vertical range of +/- 45˚. All accuracies are stated in maximum permissible error (MPe). typical results are half of MPe.


UXYZ – Full Range

The measurement uncertainty of a coordinate “uxyZ” is defined as the deviation between a measured coordinate and the nominal coordinate of that point. this measurement uncertainty is specified as a function of the distance between the laser tracker and the measured point.

AT401: +/- 15 µm + 6 µm/m (+/- 0.0006” + 0.00007”/ft)



sensor size:  290 x 221 x 188 mm (11.4” x 8.7” x 7.4“) 
sensor Weight:  7.3 kg (16 lbs) 
controller size:  250 x 112 x 63 mm (9.8” x 4.4” x 2.5”) 
controller Weight:  0.8 kg (1.75 lbs)


infinite horizontal rotation:  +/-360˚ 
infinite Vertical rotation:  +/- 145˚ 
typical working Volume:  320 m


dust/Water:  iP54 (iec 60529) 
operating temperature:  0˚c to +40˚c 
relative humidity:  Max. 95% (non-condensing) 
altitude:  -700 to 5500 m (-2,300 to 18,000 ft)


acceleration:  360˚/s2 
rotation speed:  180˚/s
Powerlock:  10˚ FoV

Absolute Angular Performance

resolution:  0.07 arc seconds 
accuracy (MPe):  +/- 15 µm + 6 µm/m  (+/- 0.0006” + 0.00007”/ft) 
repeatability (MPe):  +/- 7.5 µm + 3 µm/m  (+/-0.0003” + 0.00004”/ft) 
inclination setting accuracy (2σ):  +/- 1 arc second

Absolute Distance Performance

Resolution:  0.1 µm 
Accuracy (MPe):  +/- 10 µm (+/- 0.00039”) 
Repeatability (MPe):  +/- 5 µm (+/- 0.0002”)

Laser Emission

class 2 laser Product in accordance with the iec 60825-1 second edition (2007-03)

General information

overview camera (oVc)  4:3 ir enhanced image ≈ 10˚ FoV
Environmental Monitor  Internal – temperature, Pressure  and humidity   External – air temperature – object temperature
Remote Control  Integrated 4 button ir
Interfaces  Cable – tcP/iP (cat5)  Wireless – WlaN (ieee 802.11g)

Power Management

Internal: lithium-ion battery   
External: AC power supply
Optional: Power Over Ethernet (Poe+)