JJF 1126-2004 PDF English
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| JJF 1126-2004 | English | 200 |
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Calibration Specification for Ultrasonic Thickness Instruments
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JJF 1126-2004: Calibration Specification for Ultrasonic Thickness Instruments---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/JJF1126-2004
NATIONAL METROLOGICAL VERIFICATION REGULATIONS
Calibration Specification for Ultrasonic Thickness
Instruments
Issued on. SEPTEMBER 21, 2004
Implemented on. MARCH 21, 2005
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China
This Specification was approved by General Administration of Quality
Supervision, Inspection and Quarantine of the People's Republic of China on
September 21, 2004 and shall be implemented since March 21, 2005.
Jurisdiction organization.
National Geometry and Length Measurement Technical Committee
Main drafting organizations.
Tianjin Institute of Metrology Technology
China Institute of Metrology
Participating drafting organization.
Times Group Corporation
This Specification shall be interpreted by the jurisdiction organization.
Calibration Specification for
Ultrasonic Thickness Instruments
Replacing JJG 403-1986
Main drafters of this Specification.
Wang Xinhang (Tianjin Institute of Metrology Technology)
Zhang Heng (China Institute of Metrology)
Liu Jiali (Tianjin Institute of Metrology Technology)
Participating drafters.
Peng Xuelian (Times Group Corporation)
Lu Ruijun (Tianjin Institute of Metrology Technology)
Table of Contents
1 Scope... 5
2 Normative references... 5
3 Overview... 5
4 Metrological characteristics... 7
5 Calibration conditions... 8
6 Calibration items and calibration methods... 9
7 Calibration result expression... 11
8 Recalibration time interval... 11
Annex A Calibration certificate content... 12
Annex B Technical requirements for standard thickness block... 13
Annex C Technical requirements for standard round tubes... 14
Annex D Uncertainty analysis on calibration results of indication error of
ultrasonic thickness instruments... 15
Annex E Sound velocity and sound velocity ratio of various materials... 19
Calibration Specification for Ultrasonic Thickness
Instruments
1 Scope
This Specification is applicable to the calibration of ultrasonic thickness
instruments of which the resolution is 0.1mm and 0.01mm.
2 Normative references
This Specification referred to the following referenced documents.
JJF 1001-1998, General Terms in Metrology and Their Definitions
JJF 1059-1999, Evaluation and Expression of Uncertainty in Measurement
GB/T 12064.1-1999, Nondestructive testing terms - Ultrasonic testing
GB/T 11344-1989, Measuring thickness by ultrasonic pulse-echo contact
method
When using this Specification, it shall use the currently valid versions of the
above references.
3 Overview
The ultrasonic thickness instruments are mainly used to measure the wall
thickness of hulls, oil and gas pipelines, high-pressure vessels, boilers as well
as the thickness of large area sheet. The material to be tested can be metal
materials such as steel, or non-metal materials such as plastic and nylon. The
principle is that the instrument emits ultrasonic waves through the probe and
reflects back to the test head after reaching the bottom surface of the test piece.
Use a counter to accurately measure the time that ultrasonic waves travel
4 Metrological characteristics
4.1 Repeatability
See Table 1 for instrument resolution specifications and corresponding
repeatability requirements.
4.2 Indication error
See Table 1 for instrument resolution specifications and corresponding
maximum allowable indication error.
4.3 Indication error of curved wall thickness measurement
See Table 2 for the instrument resolution specification and corresponding
maximum allowable indication error.
4.6 Indication stability
See Table 3 for the instrument resolution specifications and corresponding
indication stability requirements (the automatic shutdown type instrument does
not conduct this calibration).
5 Calibration conditions
5.1 The calibration room temperature shall be 20°C±5°C. The relative humidity
shall be less than 65%RH.
5.2 The standard thickness blocks and standard round tubes used for
calibration instruments shall meet the technical requirements in Annex B and
Annex C.
6 Calibration items and calibration methods
Before calibration, it is necessary to confirm that there are no defects in
appearance and electromechanical functions that affect the calibration
metrological characteristics.
6.1 Repeatability
After the instrument is turned on, operate the sound speed adjustment key or
the sound speed dial to adjust the sound speed to 5900m/s. Return to the state
of the instrument measuring thickness.
6.2 Indication error
Conduct calibration according to the procedures specified by the instrument.
Measure the standard thickness blocks in Annex B one by one in the measuring
range of the instrument.
6.3 Indication error of curved wall thickness measurement
Conduct calibration according to the procedures specified by the instrument (do
not recalibrate if the probe is not replaced).
6.4 Fine adjustment range for thickness calibration
After the instrument calibration, keep the coupling state of the probe and
thickness block unchanged. Continuously adjust the " " and " " keys of the
instrument calibration (or rotate the fine adjustment knob for calibration
thickness). The indication range of the instrument shall not be less than ± 1mm.
7 Calibration result expression
After the instrument is calibrated, issue a calibration certificate. The calibration
certificate shall include at least the information contained in Annex A.
8 Recalibration time interval
The recommended recalibration time interval is 1 year.
JJF 1126-2004
NATIONAL METROLOGICAL VERIFICATION REGULATIONS
Calibration Specification for Ultrasonic Thickness
Instruments
Issued on. SEPTEMBER 21, 2004
Implemented on. MARCH 21, 2005
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China
This Specification was approved by General Administration of Quality
Supervision, Inspection and Quarantine of the People's Republic of China on
September 21, 2004 and shall be implemented since March 21, 2005.
Jurisdiction organization.
National Geometry and Length Measurement Technical Committee
Main drafting organizations.
Tianjin Institute of Metrology Technology
China Institute of Metrology
Participating drafting organization.
Times Group Corporation
This Specification shall be interpreted by the jurisdiction organization.
Calibration Specification for
Ultrasonic Thickness Instruments
Replacing JJG 403-1986
Main drafters of this Specification.
Wang Xinhang (Tianjin Institute of Metrology Technology)
Zhang Heng (China Institute of Metrology)
Liu Jiali (Tianjin Institute of Metrology Technology)
Participating drafters.
Peng Xuelian (Times Group Corporation)
Lu Ruijun (Tianjin Institute of Metrology Technology)
Table of Contents
1 Scope... 5
2 Normative references... 5
3 Overview... 5
4 Metrological characteristics... 7
5 Calibration conditions... 8
6 Calibration items and calibration methods... 9
7 Calibration result expression... 11
8 Recalibration time interval... 11
Annex A Calibration certificate content... 12
Annex B Technical requirements for standard thickness block... 13
Annex C Technical requirements for standard round tubes... 14
Annex D Uncertainty analysis on calibration results of indication error of
ultrasonic thickness instruments... 15
Annex E Sound velocity and sound velocity ratio of various materials... 19
Calibration Specification for Ultrasonic Thickness
Instruments
1 Scope
This Specification is applicable to the calibration of ultrasonic thickness
instruments of which the resolution is 0.1mm and 0.01mm.
2 Normative references
This Specification referred to the following referenced documents.
JJF 1001-1998, General Terms in Metrology and Their Definitions
JJF 1059-1999, Evaluation and Expression of Uncertainty in Measurement
GB/T 12064.1-1999, Nondestructive testing terms - Ultrasonic testing
GB/T 11344-1989, Measuring thickness by ultrasonic pulse-echo contact
method
When using this Specification, it shall use the currently valid versions of the
above references.
3 Overview
The ultrasonic thickness instruments are mainly used to measure the wall
thickness of hulls, oil and gas pipelines, high-pressure vessels, boilers as well
as the thickness of large area sheet. The material to be tested can be metal
materials such as steel, or non-metal materials such as plastic and nylon. The
principle is that the instrument emits ultrasonic waves through the probe and
reflects back to the test head after reaching the bottom surface of the test piece.
Use a counter to accurately measure the time that ultrasonic waves travel
4 Metrological characteristics
4.1 Repeatability
See Table 1 for instrument resolution specifications and corresponding
repeatability requirements.
4.2 Indication error
See Table 1 for instrument resolution specifications and corresponding
maximum allowable indication error.
4.3 Indication error of curved wall thickness measurement
See Table 2 for the instrument resolution specification and corresponding
maximum allowable indication error.
4.6 Indication stability
See Table 3 for the instrument resolution specifications and corresponding
indication stability requirements (the automatic shutdown type instrument does
not conduct this calibration).
5 Calibration conditions
5.1 The calibration room temperature shall be 20°C±5°C. The relative humidity
shall be less than 65%RH.
5.2 The standard thickness blocks and standard round tubes used for
calibration instruments shall meet the technical requirements in Annex B and
Annex C.
6 Calibration items and calibration methods
Before calibration, it is necessary to confirm that there are no defects in
appearance and electromechanical functions that affect the calibration
metrological characteristics.
6.1 Repeatability
After the instrument is turned on, operate the sound speed adjustment key or
the sound speed dial to adjust the sound speed to 5900m/s. Return to the state
of the instrument measuring thickness.
6.2 Indication error
Conduct calibration according to the procedures specified by the instrument.
Measure the standard thickness blocks in Annex B one by one in the measuring
range of the instrument.
6.3 Indication error of curved wall thickness measurement
Conduct calibration according to the procedures specified by the instrument (do
not recalibrate if the probe is not replaced).
6.4 Fine adjustment range for thickness calibration
After the instrument calibration, keep the coupling state of the probe and
thickness block unchanged. Continuously adjust the " " and " " keys of the
instrument calibration (or rotate the fine adjustment knob for calibration
thickness). The indication range of the instrument shall not be less than ± 1mm.
7 Calibration result expression
After the instrument is calibrated, issue a calibration certificate. The calibration
certificate shall include at least the information contained in Annex A.
8 Recalibration time interval
The recommended recalibration time interval is 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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