ASQ Certified Calibration Technician (CCT) Flashcards

'Bias' in a measurement system is defined as:

Answer: The systematic difference between the average of multiple measurements and the true reference value

Bias (systematic error or offset) is the consistent, predictable difference between the average measured value and the true value, correctable by adjustment.

In measurement system management, 'stability' refers to:

Answer: The change in bias of a measurement system over time when measuring the same reference part

Measurement system stability tracks how the bias changes over time — a stable system shows no significant drift when repeatedly measuring the same reference part.

What does 'as-found' vs. 'as-left' mean in calibration records?

Answer: As-found is the condition of the instrument when received for calibration; as-left is the condition after calibration and any adjustments

As-found documents the instrument's accuracy before any adjustments during calibration, while as-left documents its accuracy after all calibration adjustments are made.

'Linearity' in a measurement instrument refers to:

Answer: The consistency of bias across the instrument's full operating range

Linearity assesses whether the bias of a measurement system remains constant across its full measurement range, or whether it varies at different points.

The '10:1 rule' in calibration refers to:

Answer: The ratio between the accuracy of the calibration standard and the accuracy of the instrument being calibrated

The 10:1 rule states that the calibration standard should be at least 10 times more accurate than the instrument being calibrated to minimize calibration uncertainty.

According to ISO/IEC 17025, a calibration laboratory's quality management system must ensure:

Answer: Technical competence, impartiality, and consistent application of traceable measurement methods

ISO/IEC 17025 requires testing and calibration laboratories to demonstrate technical competence, metrological traceability, and impartiality in their measurement activities.