CRB Signal Margin and Focus Stability

CRB signal margin is a practical indicator of whether the optical path and focus alignment are healthy enough for stable startup and imaging.

Why It Matters

When CRB feedback drops, the machine may still run intermittently, but focus lock becomes sensitive to contamination, alignment drift, and thermal changes.

Recommended Checks

• Inspect optical cleanliness before changing electronics
• Compare CRB readings before and after warm-up
• Confirm Z focus calibration after any optical intervention

Field Guidance

A stable CRB margin reduces repeated focus failures and unnecessary board replacement.