Define repeatability in gauge R&R studies.

Define repeatability in gauge R&R studies.

• A. Variation between operators.
• B. Variation over time due to calibration drift.
• C. Variation when the same operator uses the same instrument.
• D. Variation caused by environmental conditions.

Answer: (C)

Repeatability is the variation observed when the same operator uses the same instrument to measure the same part multiple times under identical conditions. It reflects the measurement system’s precision at the most basic level, capturing instrument noise and minor differences in technique that occur in repeated trials. In gauge R&R studies, this is contrasted with reproducibility, which is the variation seen when different operators or different setups are used. So, variations caused by different operators, by environmental conditions, or by calibration drift fall under reproducibility (or broader measurement system effects), not repeatability. If repeatability is larger than desired, improving instrument stability, operator training, or measurement procedures can reduce that short-term measurement noise.

Repeatability is the variation observed when the same operator uses the same instrument to measure the same part multiple times under identical conditions. It reflects the measurement system’s precision at the most basic level, capturing instrument noise and minor differences in technique that occur in repeated trials. In gauge R&R studies, this is contrasted with reproducibility, which is the variation seen when different operators or different setups are used. So, variations caused by different operators, by environmental conditions, or by calibration drift fall under reproducibility (or broader measurement system effects), not repeatability. If repeatability is larger than desired, improving instrument stability, operator training, or measurement procedures can reduce that short-term measurement noise.