Shop name for an interlaboratory comparison where a single stable artifact or sample set circulates among participating labs, each measuring it and reporting a value with uncertainty. The pilot lab measures it at the start and end to check for drift in transit. Results are compared with En numbers or similar scores, so a round robin both tests individual labs and reveals reproducibility across them.
Gauge block round robin finally came back, our En numbers are all under 0.5 except the 100 mm block.
Also heard as
- interlaboratory comparison
- ILC
- ring comparison
Related terms
Proficiency testing
Judging a lab's performance by having it measure circulated items and scoring its results against a reference value.
En number
A score comparing a lab's result with a reference value, scaled by both expanded uncertainties; 1 or less passes.
Transfer standard
A stable, portable standard used to carry a value from one lab or standard to another for comparison.
Reproducibility
How well results on the same item agree when the lab, operator, equipment or day is changed on purpose.