If the instrument’s regulation is performed using a control device (calibrator, caliber, control solution, etc.), it is called “calibration” in English.
The term “calibration” is used in the technical documentation of most manufacturers’ measuring instruments and is often incorrectly translated into Lithuanian as “kalibravimas”. This is an informal engineering term that refers to the adjustment of the technical parameters of a device to the technical parameters specified by the manufacturer. This adjustment is made by metrological verification of most modern measuring instruments with external sensors (such as a noise meter microphone) according to the technical documentation. For example, when inspecting the sound level meter, the instrument must be adjusted using an acoustic calibrator from the instrument set before the measurements can be made. The calibrator volume level value is entered and saved. It would be more correct to use the term “derinimas” in Lithuanian. It is part of a verification or metrological calibration.
The metrological term “Calibration” is official and established in the Law on Metrology of the Republic of Lithuania: “Calibration of a measuring instrument is the set of operations which, under specified conditions, determine the coincidence or difference between the values displayed by the measuring instrument or measuring system being calibrated and the values displayed by the working standard or reference measuring instrument.” Simply put, it is the determination of the true value of a measured quantity by measurements and calculations, which the instrument actually shows in comparison with a standard and the range within which the measured value with a given probability is (usually 95%).
Another regulatory option is technical regulation, which is called “adjustment” in English. The latter is more about repair and adjustment using technical means and tools. It usually requires disassembly of the device or other intervention, which is not permitted during the inspection or metrological calibration but may be required before the inspection to obtain precise results. For example, the mechanical reset of the manometer pointer to zero.