CCIL Laboratory Equipment Calibration 5

Question 1

In the context of calibration, 'traceability' means that measurement results are linked to reference standards through:

Accepted Answer

A chain of comparisons with stated uncertainties

Answer

Metrological traceability is established through an unbroken chain of calibrations, each contributing documented uncertainty, back to SI or national standards.

Question 2

Which type of reference material is assigned values by a national metrology institute and is used as the highest-level calibrant?

Accepted Answer

Primary certified reference material (CRM)

Answer

Primary CRMs are produced by national metrology institutes with the highest metrological rigor and serve as the top of the traceability chain.

Question 3

What is the purpose of a 'guard band' applied during a calibration acceptance decision?

Accepted Answer

To reduce the risk of accepting a nonconforming instrument by tightening the acceptance limit

Answer

Guard bands narrow acceptance limits to account for measurement uncertainty, reducing the probability of incorrectly accepting an out-of-tolerance instrument.

Question 4

Which method is used to calibrate electrical resistance standards in accredited laboratories?

Accepted Answer

Kelvin double bridge or automated resistance bridge comparison

Answer

Kelvin double bridges and automated resistance comparators minimize lead and contact resistance errors, providing traceable resistance calibration.

Question 5

Under CCIL accreditation requirements, calibration records must be retained for a minimum period to allow:

Accepted Answer

Assessment during audits and investigation of measurement disputes

Answer

Records are retained to support audits, trend analysis, and resolution of any disputes about measurement validity during the retention period.

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL Laboratory Equipment Calibration 5