JJF 1914-2021 Calibration Specification for Metallurgical Microscopes
1 Scope
This specification is applicable to the calibration of metallurgical microscopes with monocular or binocular viewing systems, as well as those equipped with image sensors for image reception.
2 Normative references
The normative references of this specification are as follows:
JJF 1071-2010 The Rules for Drafting National Calibration Specification
JB/T 10077-1999 Metallurgical microscope
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
3 Overview
A metallurgical microscope is an optical instrument used for observing and measuring the microstructure of metals. According to the way of metallurgical microscopes observing object images, the metallurgical microscope can be classified into eyepiece observation type and image sensor reception type.
4 Metrological characteristics
4.1 Relative deviation between the centers of the left and right fields of view for binocular microscopes
Vertical: not greater than 0.2 mm;
Lateral: not greater than 0.2 mm (outer position); not greater than 0.4 mm (inner position).
4.2 Magnification error of the objective lens
The maximum permissible error (MPE) for objective lens magnification generally does not exceed ±5%.
Introduction i 1 Scope 2 Normative references 3 Overview 4 Metrological characteristics 4.1 Relative deviation between the centers of the left and right fields of view for binocular microscopes 4.2 Magnification error of the objective lens 4.3 Indication error 5 Calibration conditions 5.1 Environmental conditions 5.2 Standards for calibration 6 Calibration items and methods 6.1 Relative deviation between the centers of the left and right fields of view for binocular microscopes 6.2 Magnification error of the objective lens 6.3 Indication error 7 Expression of calibration results 8 Recalibration time interval Annex A Example of calibration uncertainty evaluation for indication error
