What is calibration and what is verification of measuring equipment, and how do they differ under CBM T6 standards?

• A. Verification confirms instrument remains within tolerance; calibration establishes accuracy against traceable standards.
• B. Calibration establishes accuracy against traceable standards; verification confirms instrument remains within tolerance without adjustment.
• C. Calibration is done whenever the instrument is moved to a new environment.
• D. Verification requires adjusting the device.

Answer: (B)

In CBM T6 standards, you’re looking at two separate checks that keep measurement results trustworthy. Calibration is about establishing how accurate the instrument is by comparing its readings to known, traceable standards. If the readings don’t match, calibration may involve adjusting the instrument so its output aligns with those standards. This process creates an accuracy benchmark, often with an uncertainty estimate and documentation showing the traceability chain.

Verification, on the other hand, is a confirmatory check that the instrument stays within its specified tolerance without making any adjustments. It’s the go-to step for routine reassurance after installation, relocation, maintenance, or at scheduled intervals. If verification shows readings are still within tolerance, no adjustment is needed.

So the best choice reflects calibration as establishing accuracy against traceable standards (and possibly adjusting to achieve that accuracy) and verification as confirming the instrument remains within tolerance without adjustment.