Laser Tracker Calibration

Our Laser Tracker Calibration Service

Certified API calibration labs are located globally and are certified by the factory in Rockville Maryland. For peak performance of your laser tracker, an annual calibration, certification or performance check for your laser tracker is critical. As with any mechanical-electrical sensor, minor adjustment, updated firmware and some tender loving care is always warranted.

Laser Calibration Procedure

Laser Tracker calibrations consist of the following steps.

Performance Check

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Complete check in with as-found performance checks.

2D Mapping


This procedure is used to map and eliminate the intensity dependent error and the absolute distance error. We initially perform IDE at set distances up to the full range of the tracker to map the intensity return of the ADM laser on the SMR. We then place the compensation file that the software calculates into the tracker controller and perform ADE. ADE maps and compensates for the ADM to IFM distance error.

Birdbath Calibration

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This procedure is used to calibrated the birdbath distance. We perform in-line measurements to get a baseline with as little encoder error as possible, alignment is very important at the initial position. We then move the tracker to the center of the nest and remeasure the points to compensate for the birdbath offset.

Frequency Beating


This test is used to verify that the output wavelength of the IFM laser that is installed on the API T2+, T3, and Radian laser tracker is within specification. For this test, we are comparing the output wavelength of the customer laser tracker to that of a NIST traceable API XD1 Laser.

Level Calibration

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This test is used to calibrated the level that was installed at the API factory.

Enhanced Bundle Station


This multifaceted test is used to verify that the trackers encoders and measurements are within specification. For this test, we measure fixed points at six different locations. We begin by measuring an in-line monument system to collect the horizontal “scale bar” reference points. We then move the system to the next position, where we take vertical “scale bar” points using a mirror. This mirror allows us to effectively take “in-line” measurements without having to set the tracker up using a less conventional method, thereby allowing us to use a standard measurement stand and to simultaneously minimize encoder error.

Alignment and Verification

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Used to perform IFM straightness and angularity verification and, if necessary, alignment. Also used to perform Beam Separation test, which checks how closely the ADM beam is to the IFM beam. If necessary, we use also this station for ADM alignment. The Final Check process is also performed here, which consists of performing ADM Linear Calibration and ADM Verification. This test verifies that the ADM to IFM deviation is within specification.

Final Testing Review


We ensure all procedures are performed to the highest quality standards.

Certified Service

Typically, calibrations are completed and returned to the customer within 10 – 15 days. We also offer an expedited service or discounted rental equipment if you need a replacement system. As an option, you can purchase an extended warranty that includes a loaner laser tracker. API is now certifying Faro and Hexagon Laser Tracker! Certifications of API, Faro and Hexagon laser trackers can also be performed at your facility. ASME B89.4.19 Laser Tracker Performance Calibrations Complete B89 performance evaluations with the API Laser Rail using automated software analysis.

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