Calibration establishes the relationship between a measurement system and approved physical references; verification checks whether that relationship remains acceptable.
Calibration and daily verification are different activities.
Approved fixtures and procedures protect traceability.
Mechanical condition should be checked before changing calibration.
Records make repeated issues easier to diagnose.
What calibration establishes
Camera frames, target geometry, lift reference and other elements may each have calibration procedures. The process uses known references so software can solve the geometry of the measurement system. Calibration does not make worn clamps, loose structures or damaged targets accurate.
Verification before recalibration
When results appear unusual, first repeat the measurement under controlled conditions. Inspect the vehicle setup, clamps, targets, camera structure and bay. Use the approved verification fixture or known reference. Recalibrating immediately can hide the real cause and create a second problem.
When calibration may be required
Calibration may be required after installation, camera or frame movement, replacement of defined components, major impact, bay relocation or failed verification. The exact triggers and intervals depend on the product. Follow the service documentation and retain date, technician, fixture and result records.
Inspect → verify → identify the cause → calibrate when required → verify again.
Diagnostic reference
| Finding | Possible meaning | Next check |
|---|---|---|
| All wheels show similar offset | Camera frame or common reference shift | Run system-level verification |
| Only one target produces error | Target, holder or clamp issue | Swap or inspect the affected reference |
| Calibration will not complete | Fixture setup, visibility or mechanical instability | Correct setup before repeating |
Workshop procedure
- Confirm the correct calibration procedure and tools.
- Inspect fixtures for damage and identification.
- Stabilize the camera structure and bay.
- Clean optical and target surfaces.
- Follow the sequence without skipping positions.
- Save the result and complete independent verification.
Frequently asked questions
How often should an aligner be calibrated?
Use the manufacturer requirements and local quality system. Event-based checks after movement, impact or failed verification are often as important as calendar intervals.
Is runout compensation a calibration?
No. Compensation addresses the relationship between the wheel and its mounted target during a vehicle measurement. Calibration establishes the measuring system geometry.
Can calibration be done without the approved fixture?
Not reliably. The procedure depends on known geometry and identified tools.
Technical reference · Published 17 July 2026 · Review product documentation before service.