CCT Calibration Standards & Regulations 5

Question 1

What is the key difference between 'verification' and 'calibration' in metrological practice?

Accepted Answer

Calibration determines deviation from a standard; verification confirms conformance to a specification

Answer

Calibration determines the relationship between instrument output and true value (with uncertainty), while verification confirms whether the equipment meets specified requirements — it typically results in a pass/fail decision.

Question 2

What is a 'calibration interval' and what factors influence its determination?

Accepted Answer

The period between successive calibrations, influenced by stability history, usage, and risk

Answer

A calibration interval is the period between successive calibrations of an instrument, determined by factors including measurement stability history, frequency and severity of use, environmental conditions, and risk of out-of-tolerance condition.

Question 3

Which standard provides guidance on the selection and use of statistical methods for calibration interval analysis?

Accepted Answer

NCSL RP-1

Answer

NCSL Recommended Practice RP-1 provides methods for optimizing calibration intervals based on historical in-tolerance data and defined reliability targets.

Question 4

What action is required when a reference standard is found to be out of tolerance upon return from external calibration?

Accepted Answer

Assess the impact on all measurements made since the last valid calibration and take corrective action

Answer

Finding an out-of-tolerance reference standard triggers a retrospective impact assessment to determine whether previously issued calibration results may have been affected, followed by appropriate corrective actions.

Question 5

Which concept describes the degree to which a measuring instrument gives the same reading when measuring the same quantity under the same conditions?

Accepted Answer

Repeatability

Answer

Repeatability is the closeness of agreement between repeated measurements of the same measurand under identical conditions — it is a component of precision, not accuracy.

(CCT) Certified Calibration Technician Practice Test

(CCT) Certified Calibration Technician Practice Test

CCT Calibration Standards & Regulations 5