In the process of testing, metrological verification and instrument calibration are often encountered. What is the difference between the two?

Different meanings

Metrological verification: refers to all the work performed to evaluate the metrological performance of measuring instruments and determine whether they are qualified, including inspection and sealing and stamping. It is an important form of value transfer and an important measure to ensure the accuracy and consistency of value.

Instrument verification: The act of testing and adjusting measuring instruments or standard parts to understand their accuracy is called instrument verification.

Different purposes

Calibration: Determine whether the value of monitoring and measuring devices is accurate. It is a bottom-up value traceability and evaluation of indication error.

Verification: A mandatory comprehensive assessment of metrological characteristics. It is a unified value and whether the verification meets the specified requirements. It is a top-down value transfer.

Different objects

Calibration: Measuring instruments and measuring devices other than mandatory verification.

Calibration: National mandatory calibration: measurement reference instruments; measurement standard instruments; 59 types of work measurements in seven categories for trade settlement, safety protection, medical care, and environmental monitoring.