How do you calibrate a smart valve positioner?

Smart positioner calibration (auto-calibration): initiate auto-tune procedure from handheld or software, positioner strokes valve full range learning dead band, friction, spring rate, and I/P characteristics. Manual fine-tuning: set zero (closed position at 4 mA), set span (open position at 20 mA), adjust travel limits, configure fail action, and set response parameters (gain, dead band). Verify: check linearity at 25%, 50%, 75% points, verify fail position with air removal. Document: record as-found and as-left positions, friction, diagnostics. Compare diagnostics to baseline for valve health assessment.