Resolution
The measurement increment or digital output step available from the encoder configuration.
TECHNOLOGY / METROLOGY BASICS
Encoder resolution vs accuracy: avoid the most common specification error.
Resolution is the smallest reported increment; accuracy describes closeness to the true position under stated conditions.
ENGINEERING CONTEXT
The decision starts with the real constraint.
A 0.5 nm output increment does not make the whole axis accurate to 0.5 nm. Scale error, interpolation error, mounting, thermal expansion, mechanics and calibration all contribute to system accuracy.
Discuss your requirement ↗CRITICAL REQUIREMENTS
Define these before model selection.
Scale accuracy
The documented scale deviation, typically stated per meter and at a reference temperature.
System accuracy
The complete machine result including mechanics, alignment, environment and compensation.
SOLUTION ROUTES
Continue from requirement to system.
EVIDENCE CHECKLIST
Ask for evidence that closes the decision.
- Calibration method
- Reference instrument
- Temperature and travel
- Repeatability and uncertainty
TECHNICAL REVIEW
Turn the requirement into a selection brief.
Send the application, critical parameters and any drawing or process information available.
Discuss your application ↗