Quality formula
Total defects found per 100 units inspected. One unit can carry several defects, so DHU can exceed 100.
DHU = total defects / units inspected × 100
| Symbol | Meaning | Unit |
|---|---|---|
| D | Total defects found | defects |
| U | Units inspected | pcs |
Use it for inline and end-of-line inspection where you want to see the full defect load, including multiple defects on one garment.
An end-of-line checker inspects 300 garments and records 45 defects on 38 garments.
DHU counts defects per hundred garments checked. The formula, how it differs from defective percentage, a worked example from end-of-line checking, and how to turn DHU data into action on the line.
Inline inspection checks work at or near each operation while the line is running. How the traffic light system works, how to choose operations to check, sample sizes and frequency, and how to act on the results.