Calibration Services

Video Measuring Machine (VMM) Calibration

What Is Video Measuring Machine Calibration?

Video Measuring Machine (VMM) calibration is the process of verifying and adjusting the machine's optical and positioning accuracy to ensure precise, non-contact measurements.

Since VMM systems rely on cameras, lenses and image-processing technology, calibration is essential for maintaining accurate dimensional measurements, especially when inspecting small, complex or delicate components.

Regular calibration helps reduce measurement errors, improve consistency and support compliance with applicable quality standards.

Method of Video Measuring Machine Calibration

1 System Inspection

Check the condition of the camera, lens, lighting system and measurement stage.
Ensure stable machine operation and proper optical focus.

2 Axis Accuracy Verification

Measure the positioning accuracy of the X and Y axes, including the Z axis where applicable.
Use precision artefacts such as glass scales or calibration grids.

3 Optical Calibration

Calibrate the machine's magnification and pixel resolution.
Verify measurement accuracy across the available zoom and magnification levels.

4 Distortion and Linearity Check

Verify image distortion using suitable grid patterns.
Check edge-detection accuracy and measurement consistency.

5 Probe Calibration

Calibrate the touch probe or laser probe when the machine is equipped with one.
Ensure that the probe is correctly integrated with the optical measurement system.

6 Software Verification

Validate the measurement software's calculations and outputs.
Check feature extraction, edge detection and dimensional result generation.

7 Error Compensation

Apply the necessary correction factors within the measurement system.
Fine-tune the machine settings to achieve optimum measurement accuracy.

8 Certification and Reporting

Provide a detailed calibration report documenting the results.
Maintain traceability to applicable international standards, such as ISO 10360 and ISO 14253.

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