Measurement Systems Analysis Flashcards

'Measurement traceability' in a quality calibration system means:

Answer: An unbroken chain of calibration comparisons linking measurements to national or international standards

Traceability requires an unbroken chain of comparisons, each with stated uncertainties, linking measurement results to primary standards maintained by organizations such as NIST.

When a measuring instrument is found out of calibration during a scheduled check, the required response is to:

Answer: Remove it from service and assess the potential impact on products measured since the last valid calibration

ISO 9001 and quality system requirements mandate that out-of-calibration findings trigger a nonconformance process, including assessment of products or decisions made using that instrument.

Attribute agreement analysis (attribute Gauge R&R) is used when measurement output is:

Answer: Categorical, such as pass/fail, go/no-go, or ranked classifications

Attribute agreement analysis assesses the consistency of categorical inspection decisions (e.g., pass/fail) within and between operators, and compared against a known reference standard.

Measurement uncertainty, as defined in the GUM (Guide to the Expression of Uncertainty in Measurement), represents:

Answer: A parameter characterizing the dispersion of values that could reasonably be attributed to the measurand

Measurement uncertainty is a range or interval estimate characterizing the doubt about the measurement result, typically expressed at a specified confidence level such as 95%.

In Gauge R&R terminology, 'appraiser variation' (AV) corresponds to:

Answer: Reproducibility — the variation introduced by different operators using the same gauge

Appraiser variation (AV) is the reproducibility component, representing the variation introduced when different operators (appraisers) use the same gauge to measure the same parts.

ISO/IEC 17025 is the primary international standard governing:

Answer: The competence requirements for testing and calibration laboratories

ISO/IEC 17025 specifies the general requirements for the competence, impartiality, and consistent operation of testing and calibration laboratories seeking accreditation.

A Type 1 Gauge Study (short-term gauge capability study) is primarily conducted to evaluate:

Answer: The repeatability and resolution of a measurement system using a single reference part

A Type 1 Gauge Study uses one operator and one reference part to assess a gauge's basic repeatability and resolution, providing a quick pre-screen before committing to a full Gauge R&R study.