JJG 818-2018 PDF EnglishUS$210.00 · In stock · Download in 9 seconds
JJG 818-2018: Magnetic and Eddy Current Measuring Instrument for Coating Thickness Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid JJG 818: Historical versions
JJG 818-2018: Magnetic and Eddy Current Measuring Instrument for Coating Thickness---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JJG818-2018NATIONAL METROLOGICAL VERIFICATION REGULATIONS Replacing JJG 818-2005 Magnetic and Eddy Current Measuring Instrument for Coating Thickness Issued on. DECEMBER 25, 2018 Implemented on. JUNE 25, 2019 Issued by. State Administration for Market Regulation Jurisdiction organization. National Geometry Engineering Parameter Measurement Technical Committee Main drafting organizations. Beijing Institute of Metrology and Testing Tianjin Institute of Metrology and Testing Guangdong Institute of Metrology China Institute of Metrology Participating drafting organizations. Guangzhou Lantai Instrument Co., Ltd. National Geometry Engineering Parameter Measurement Technical Committee is entrusted for interpretation of this Regulation. Verification Regulation of Magnetic and Eddy Current Measuring Instrument for Coating Thickness Replacing JJG 818-2005 Main drafters of this Regulation. Huang Sheng (Beijing Institute of Metrology and Testing) Lu Ruijun (Tianjin Metrology and Testing Research Institute) Wei Zuozhi (Guangdong Academy of Metrology) Wang Kai (Chinese Academy of Metrology) Participating drafters. Sun Jingyi (Beijing Institute of Metrology and Testing) Yang Cheng (Guangzhou Lantai Instrument Co., Ltd.) Table of ContentsIntroduction... 5 1 Scope... 7 2 Normative references... 7 3 Overview... 7 4 Metrological performance requirements... 10 4.1 Measuring force and its variability... 10 4.2 Measurement repeatability... 10 4.3 Indicated value error... 10 4.4 Stability of indicated value... 10 4.5 Influence of power supply voltage change on the instrument's indicated value ... 10 4.6 Thickness sheet... 10 5 General technical requirements... 11 5.1 Appearance... 11 5.2 Interaction of each part... 11 6 Control of measuring tools... 12 6.1 Verification conditions... 12 6.2 Verification items and main verification apparatus... 12 6.3 Verification methods... 13 7 Processing of verification results... 17 8 Verification cycle... 17 Annex A Evaluation of uncertainty in measurement error of thickness measuring instrument... 18 Annex B Inner page format of verification certificate and notification of verification results... 251 ScopeThis Regulation specifies the first inspection, subsequent inspection, and in- service inspection of magnetic (magneto-resistive and magnetic-driven) and eddy current measuring instrument for coating thickness (hereinafter referred to as thickness measuring instrument).2 Normative referencesThis Regulation referred to the following referenced documents. GB/T 4956-2003, On-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method GB/T 4957-2003, Non-conductive coatings on non-magnetic basis metals - Measurement of coating thickness - Eddy current For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.3 OverviewThe magnetic measuring instrument for coating thickness in the thickness measuring instrument is usually used to measure the thickness of non-magnetic coating on magnetic metal substrate. The eddy current measuring instrument for coating thickness is usually used to measure the thickness of non-magnetic coating on non-magnetic metal substrate.4 Metrological performance requirements4.1 Measuring force and its variability The measuring force of the probe of thickness measuring instrument. (0.3~1.5) N. The variability of measuring force shall not exceed 1/3 F, where F is the average of 10 measured forces. 4.2 Measurement repeatability The measurement repeatability of thickness measuring instrument shall not exceed the one specified in Table 1. 4.6 Thickness sheet See Table 1 for the uncertainty and uniformity of the thickness measurement results of thickness sheet.5 General technical requirements5.1 Appearance 5.1.1 The designation of thickness measuring instrument shall be marked with instrument name, model, number, manufacturer name (or logo). 5.1.2 The appearance of thickness measuring instrument shall be neat, without obvious scratches, rust, damage, blistering, peeling of paint film. The surface of thickness sheet shall not be severely scratched or damaged. 5.2 Interaction of each part 5.2.1 The pointer movement of the indicator is smooth, without jamming, sticking needles, crawling, etc. 5.2.2 The connection of connectors is reliable and convenient to use. All operation switches, knobs, keys and indicators work reliably and effectively. Fasteners must not be loose or defective. 5.2.3 The functions of thickness measuring instrument shall work reliably and effectively.6 Control of measuring toolsThe control of measuring tools includes first inspection, subsequent inspection and in-service inspection. 6.1 Verification conditions 6.1.2 Verification equipment See Table 3 for main verification equipment. 6.2 Verification items and main verification apparatus See Table 3 for verification items. 6.3 Verification methods 6.3.1 Appearance Visual observation. 6.3.2 Interaction between each part Visual observation and manual test. 6.3.5 Indicated value error Conduct the zero-point adjustment of thickness measuring instrument according to the instructions of use. 6.3.6 Indicated value stability Select the minimum range stop of the thickness measuring instrument for the AC-powered thickness measuring instrument. Place a thickness sheet with a value greater than 1/2 of the range near the center of the working surface of the substrate. Mount the probe on the verification table and press it vertically towards the thickness sheet and make it fixed. Record the first reading. Take a reading every 15min later. Continuously record for 1h. Take the difference between the maximum and minimum values in 5 readings as the measurement result.7 Processing of verification resultsWhen all verification items of the thickness measuring instrument meet the corresponding requirements of this Regulation, fill out the verification certificate and indicate the accuracy level.8 Verification cycleVerification cycle shall be determined according to actual use. It usually does not exceed 1 year. JJG 818-2018 NATIONAL METROLOGICAL VERIFICATION REGULATIONS Replacing JJG 818-2005 Magnetic and Eddy Current Measuring Instrument for Coating Thickness Issued on. DECEMBER 25, 2018 Implemented on. JUNE 25, 2019 Issued by. State Administration for Market Regulation Jurisdiction organization. National Geometry Engineering Parameter Measurement Technical Committee Main drafting organizations. Beijing Institute of Metrology and Testing Tianjin Institute of Metrology and Testing Guangdong Institute of Metrology China Institute of Metrology Participating drafting organizations. Guangzhou Lantai Instrument Co., Ltd. National Geometry Engineering Parameter Measurement Technical Committee is entrusted for interpretation of this Regulation. Verification Regulation of Magnetic and Eddy Current Measuring Instrument for Coating Thickness Replacing JJG 818-2005 Main drafters of this Regulation. Huang Sheng (Beijing Institute of Metrology and Testing) Lu Ruijun (Tianjin Metrology and Testing Research Institute) Wei Zuozhi (Guangdong Academy of Metrology) Wang Kai (Chinese Academy of Metrology) Participating drafters. Sun Jingyi (Beijing Institute of Metrology and Testing) Yang Cheng (Guangzhou Lantai Instrument Co., Ltd.)Table of ContentsIntroduction... 5 1 Scope... 7 2 Normative references... 7 3 Overview... 7 4 Metrological performance requirements... 10 4.1 Measuring force and its variability... 10 4.2 Measurement repeatability... 10 4.3 Indicated value error... 10 4.4 Stability of indicated value... 10 4.5 Influence of power supply voltage change on the instrument's indicated value ... 10 4.6 Thickness sheet... 10 5 General technical requirements... 11 5.1 Appearance... 11 5.2 Interaction of each part... 11 6 Control of measuring tools... 12 6.1 Verification conditions... 12 6.2 Verification items and main verification apparatus... 12 6.3 Verification methods... 13 7 Processing of verification results... 17 8 Verification cycle... 17 Annex A Evaluation of uncertainty in measurement error of thickness measuring instrument... 18 Annex B Inner page format of verification certificate and notification of verification results... 251 ScopeThis Regulation specifies the first inspection, subsequent inspection, and in- service inspection of magnetic (magneto-resistive and magnetic-driven) and eddy current measuring instrument for coating thickness (hereinafter referred to as thickness measuring instrument).2 Normative referencesThis Regulation referred to the following referenced documents. GB/T 4956-2003, On-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method GB/T 4957-2003, Non-conductive coatings on non-magnetic basis metals - Measurement of coating thickness - Eddy current For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.3 OverviewThe magnetic measuring instrument for coating thickness in the thickness measuring instrument is usually used to measure the thickness of non-magnetic coating on magnetic metal substrate. The eddy current measuring instrument for coating thickness is usually used to measure the thickness of non-magnetic coating on non-magnetic metal substrate.4 Metrological performance requirements4.1 Measuring force and its variability The measuring force of the probe of thickness measuring instrument. (0.3~1.5) N. The variability of measuring force shall not exceed 1/3 F, where F is the average of 10 measured forces. 4.2 Measurement repeatability The measurement repeatability of thickness measuring instrument shall not exceed the one specified in Table 1. 4.6 Thickness sheet See Table 1 for the uncertainty and uniformity of the thickness measurement results of thickness sheet.5 General technical requirements5.1 Appearance 5.1.1 The designation of thickness measuring instrument shall be marked with instrument name, model, number, manufacturer name (or logo). 5.1.2 The appearance of thickness measuring instrument shall be neat, without obvious scratches, rust, damage, blistering, peeling of paint film. The surface of thickness sheet shall not be severely scratched or damaged. 5.2 Interaction of each part 5.2.1 The pointer movement of the indicator is smooth, without jamming, sticking needles, crawling, etc. 5.2.2 The connection of connectors is reliable and convenient to use. All operation switches, knobs, keys and indicators work reliably and effectively. Fasteners must not be loose or defective. 5.2.3 The functions of thickness measuring instrument shall work reliably and effectively.6 Control of measuring toolsThe control of measuring tools includes first inspection, subsequent inspection and in-service inspection. 6.1 Verification conditions 6.1.2 Verification equipment See Table 3 for main verification equipment. 6.2 Verification items and main verification apparatus See Table 3 for verification items. 6.3 Verification methods 6.3.1 Appearance Visual observation. 6.3.2 Interaction between each part Visual observation and manual test. 6.3.5 Indicated value error Conduct the zero-point adjustment of thickness measuring instrument according to the instructions of use. 6.3.6 Indicated value stability Select the minimum range stop of the thickness measuring instrument for the AC-powered thickness measuring instrument. Place a thickness sheet with a value greater than 1/2 of the range near the center of the working surface of the substrate. Mount the probe on the verification table and press it vertically towards the thickness sheet and make it fixed. Record the first reading. Take a reading every 15min later. Continuously record for 1h. Take the difference between the maximum and minimum values in 5 readings as the measurement result.7 Processing of verification resultsWhen all verification items of the thickness measuring instrument meet the corresponding requirements of this Regulation, fill out the verification certificate and indicate the accuracy level.8 Verification cycleVerification cycle shall be determined according to actual use. It usually does not exceed 1 year. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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