Profile Projector Calibration(Traceable Glass Scale & Stage Artefacts)
Calibration of profile projectors — magnification accuracy, stage travel (X-Y), screen protractor and cross-hair alignment — using NPLI-traceable glass scales and stage micrometers.
What is Profile Projector Calibration?
Profile projectors verify thread forms, gauge profiles and small components by optical magnification — so their accuracy rests on three things: true magnification, accurate stage travel, and a correctly-reading screen protractor. Errors in any of them propagate directly into every profile measurement made on the instrument.
Global Lab calibrates projectors using NPLI-traceable glass scales and stage micrometers: magnification is verified at the screen against certified line spacings, X and Y stage travels are calibrated across their range against the glass scale, and the screen protractor is checked with certified angle references — with all results and uncertainties reported per our ISO/IEC 17025 system.
How the Profile Projector Calibration is Conducted
- 1
Visual & Alignment Check
Screen cross-hair alignment, illumination and focus travel are inspected as-found. - 2
Magnification Verification
A certified glass scale is projected and screen dimensions compared against nominal magnification at working lenses. - 3
Stage Travel Calibration
X and Y micrometer/DRO travels are calibrated at intervals across the range against the traceable scale. - 4
Protractor Screen Check
The rotatable screen protractor is verified against certified angle artefacts. - 5
Certification
Errors, uncertainties and as-left condition are issued via Autovity QLMS.
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| ISO/IEC 17025:2017 | Competence of Testing and Calibration Laboratories | Calibration System | International |
| NPLI-Traceable Artefacts | Certified Glass Scales, Stage Micrometers and Angle References | Reference Standards | Traceability |