ROC Human-Machine Interface (HMI) Ergonomic Certification Checklist
The ROC Human-Machine Interface (HMI) Ergonomic Certification Checklist is a standardized, auditable evaluation framework used to verify that the HMI systems deployed in Mine Remote Operations Centers meet internationally recognized ergonomic, usability, and safety requirements for sustained operator performance. It ensures that visual displays, control layouts, interaction modalities, and environmental integration support cognitive load management, error prevention, and physical well-being during extended remote monitoring and intervention tasks. Certification against this checklist is typically required prior to operational commissioning of ROC facilities.
📖 Overview
📑 Key Components
🎯 Applications
- ✓ Pre-commissioning ROC facility certification
- ✓ HMI software version upgrade validation
- ✓ Periodic ergonomic recertification (biannual or post-incident review)
📐 Key Formulas
Minimum Luminance Contrast Ratio
CR = (L1 + 0.05) / (L2 + 0.05)
Calculates contrast ratio between text/object (L1) and background (L2) luminance in cd/m²; must be ≥ 4.5:1 for normal text per ISO 9241-3
Maximum Permissible Input Latency
Latency ≤ 150 ms
End-to-end system response time threshold for critical control actions to prevent operator-induced errors due to temporal disorientation
NASA-TLX Weighted Workload Score
TLX = Σ(w_i × r_i) / Σw_i
Composite score (0–100) derived from six subjective dimensions (mental demand, physical demand, etc.), each rated 0–100 and weighted; scores >65 indicate excessive cognitive load requiring HMI redesign