GB/T 3048.1-2007Test methods for electrical properties of electric cables and wires - Part 1: General (English PDF)

2.1 Environmental conditions of specification

At the specified temperature and within the specified time, the specimen is placed in an environment with a specified relative humidity or immersed in water or other specified liquids.

2.2 Reference standard environment

The value measured under any environmental condition can be corrected to the value in a specific environment by calculation, and this specific environmental condition is called the reference standard environment. The standard reference atmospheric conditions are: Temperature: t0=20°C; Air pressure: b0=101.3kPa; Absolute humidity: h0=11g/m³.

2.3 Repeatability

Under the same measurement conditions, the consistency between the results obtained by successively measuring the same physical quantity for many times. results.

NOTE 4: Measurement results are generally understood here as corrected results.

NOTE 5: Under reproducibility conditions, reproducibility is given quantitatively as the experimental standard deviation SR of repeated observations (called the reproducibility standard deviation).

2.5 Calibration

Under specified conditions, it is a set of operations to determine the relationship between the value represented by the measuring instrument, the indication value of the measuring system, the physical measuring instrument or the reference material and the corresponding value determined by the reference standard.

NOTE 1: Calibration results can be used to evaluate the indication error of a measuring instrument, measuring system or physical measuring tool, or to assign values to marks on any scale.

NOTE 2: Calibration can also be used to determine other metrological characteristics.

NOTE 3: Calibration results can be recorded on a document sometimes called a "calibration certificate" or "calibration report."

NOTE 4: Correction values or "calibration factors" or "calibration curves" are sometimes used to characterize calibration results.