GB/T 39643-2020Geometrical product specifications (GPS) - Systematic errors and contributions to measurement uncertainty of length measurement due to thermal influences (English PDF)

1 Scope

This standard specifies the procedures for determining and correcting errors caused by temperature effects in the length measurement of product geometric specifications (GPS), and

Procedure for evaluating the measurement uncertainty component introduced by temperature influence:

This standard applies to length measurement in the industrial field:

Note 1: The temperature influence includes: the average temperature is the standard reference temperature; the average temperature is not the standard reference temperature, and the average value takes into account changes in time and space; temperature

The degree changes over time:

Note 2: Three situations need to be considered: the average temperature is the standard reference temperature; the average temperature is not the standard reference temperature, and the user should correct it; the average temperature is not the standard

The reference temperature is not corrected by the user:

Note 3: According to the analysis of GB/T 18779:2, thermal effect is an important factor causing measurement uncertainty and forming systematic errors: This standard is more professional

The detailed temperature influence analysis clarifies that temperature influence is an important source of measurement uncertainty and an important factor in the formation of systematic errors: Although not

The temperature gradient is discussed in detail, but some information is provided in Appendix A:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article

Pieces: For undated references, the latest version (including all amendments) applies to this document:

GB/T 19765 Product Geometrical Technical Specification (GPS) Product Geometrical Technical Specification and Standard Reference Temperature for Inspection (GB/T 19765-2005, ISO 1:2002, IDT)

JJF1001 General measurement terms and definitions

JJF1059:1 Evaluation and expression of measurement uncertainty

3 Terms and definitions

The following terms and definitions defined by JJF1059:1 and JJF1001 apply to this document: For ease of use, the following is repeated

Some terms and definitions in JJF1001 have been modified:

3:1 Terms related to thermal expansion coefficient

3:1:1

Coefficient of thermal expansion coefficientofthermalexpansion

The ratio of length change rate to temperature change:

Note 1: Generally speaking, this coefficient is a function of temperature: For the purpose of this standard, the average value of a temperature range is used, as in formula (1)

alpha20,T() =

LT -L20

L20(T-20) (1)

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