CQI Metrology & Measurement Systems Flashcards

What is the primary purpose of calibration in metrology?

Answer: To ensure measurements are traceable to a known standard

Calibration establishes measurement traceability by comparing an instrument's readings to a known reference standard.

Which instrument is commonly used to measure the internal diameter of a bore?

Answer: Bore gauge

A bore gauge is specifically designed to accurately measure internal diameters.

What does 'measurement uncertainty' represent?

Answer: The doubt about the validity of a measurement result

Measurement uncertainty quantifies the doubt associated with a measurement result, expressing the range within which the true value likely falls.

How often should measuring instruments be calibrated?

Answer: According to a defined calibration schedule based on use and risk

Calibration frequency is determined by usage, environmental conditions, and the risk associated with out-of-calibration measurements.

What is the purpose of a surface plate in metrology?

Answer: To provide a flat reference datum for measurements

A surface plate provides a known flat datum used as a reference plane for dimensional measurements and layout work.

What is a 'go/no-go' gauge used for?

Answer: Verifying that a feature is within specified tolerance limits

A go/no-go gauge quickly verifies whether a feature falls within its tolerance limits without providing an exact measurement value.