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JJG 998-2005 English PDF

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JJG 998-2005: Verification Regulation of Laser Measuring Instruments for Small Angles
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Basic data

Standard ID JJG 998-2005 (JJG998-2005)
Description (Translated English) Verification Regulation of Laser Measuring Instruments for Small Angles
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A52
Classification of International Standard 17.040.30
Word Count Estimation 16,180
Date of Issue 2005-09-05
Date of Implementation 2005-12-05
Summary This standard applies to measuring range of 0 ~ �� 5 ��, using the principle of measuring the angle of the laser sine small angle measuring instrument initial verification, testing and use of follow-up inspection

JJG 998-2005: Verification Regulation of Laser Measuring Instruments for Small Angles

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Verification Regulation of Laser Measuring Instruments for Small Angles National Metrology Verification Regulations of the People's Republic Laser small angle measuring instrument Released on.2005-09-05 Implementation of.2005-12-05 The General Administration of Quality Supervision, Inspection and Quarantine issued This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 5,.2005, and Construction will begin on December 5,.2005. Focal Point. National Geometric Angle Measurement Technical Committee Main drafting unit. China Institute of Metrology Participated in the drafting unit. Aerospace Science and Technology Group No. 102 Henan Institute of Metrology This regulation entrusts the National Geometrical Angle Measurement Technical Committee to explain The main drafters of this procedure. Liu Wen (China Institute of Metrology) Shen Ni (China Institute of Metrology) Participate in the drafters. Liu Junsong (Space Science and Technology Group No. 102) Zhang Weidong (Henan Institute of Metrology)

table of Contents

1 Scope (1) 2 Citations (1) 3 Overview (1) 4 Metrology performance requirements (1) 4.1 Drift (1) 4.2 Angle repeatability (2) 4.3 Zero-grading error (2) 5 General technical requirements (2) 5.1 Appearance (2) 5.2 Interaction of various parts of the instrument (2) 6 measuring instrument control (3) 6.1 Verification conditions (3) 6.2 Verification project (3) 6.3 Verification method (3) 6.4 Processing of verification results (6) 6.5 verification period (6) Appendix A Example of Calculation of Instrument Zero Grading Error (7) Appendix B Verification Certificate and Verification Result Notice (inside page) format (11) Laser small angle measuring instrument verification procedure

1 Scope

This procedure is applicable to laser small angle measuring instruments with a measuring range of 0~±5° and measuring angle by sinusoidal principle. First verification, follow-up verification and in-use inspection.

2 Citations

This procedure refers to the following documents. JJF1001-1998 General measurement terms and definitions JJF1059-1999 Measurement Uncertainty Evaluation and Representation JJF1094-2002 Measuring instrument characteristic evaluation When using this procedure, care should be taken to use the current valid version of the above cited documents.

3 Overview

The laser small angle measuring instrument is a kind of instrument that uses a sinusoidal principle to measure a small angle of a plane by Michelson interferometry. Device. It is mainly used to measure the indication error of the micrometer in small angle measuring instruments and circular indexing instruments, and Measurement of machine angular displacement, workpiece, etc. The optical circuit block diagram is shown in Figure 1. In the figure, the mirror group 3 is mounted on the rotating shaft of the turntable 4, and the turntable 4 drives the reflection. The mirror group 3 rotates the measured angle and then measures with an interferometer composed of a laser head 1, a beam splitter group 2, and a mirror group 3. The relative displacement of the two mirrors is calculated, and the measured angle value is calculated according to the sinusoidal principle.

4 Metrological performance requirements

4.1 Drift After starting for 30 minutes, continuous operation for 2 hours, the indication drift of the laser small angle measuring instrument is shown in Table 1. Table 1 Measurement performance requirements Verification project Technical indicators Level 1, Level 2, Level 3 Drift (") 0.05/h 0.1/h 0.1/h Angle repeatability (") 0.01 0.05 0.1 Zero division error (") 0~±1° within 0.1 0 to ±5° within 0.2 Relative error. 0.2 0.2% β Relative error. 0.2 0.6% β Note. β is the measurement range.

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