JJG 818-2018 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| JJG 818-2018 | English | 210 |
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Magnetic and Eddy Current Measuring Instrument for Coating Thickness
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| JJG 818-2005 | English | 639 |
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Verification Regulation of Magnetic and Eddy Current Measuring Instrument for Coating Thickness
| Obsolete |
| JJG 818-1993 | English | 239 |
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Verification Regulation of Eddy Current Interferometer for Measuring Thickness
| Obsolete |
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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/JJG818-2018
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 Contents
Introduction... 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... 25
1 Scope
This 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 references
This 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 Overview
The 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 requirements
4.1 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 requirements
5.1 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 tools
The 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 results
When 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 cycle
Verification 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 Contents
Introduction... 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... 25
1 Scope
This 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 references
This 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 Overview
The 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 requirements
4.1 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 requirements
5.1 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 tools
The 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 results
When 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 cycle
Verification 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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