JJG 0061-2001 PDF English
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[JJG(MH) 0061-2001] Verification Regulation of Eddy Current Flaw Detector
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JJG 0061-2001: [JJG(MH) 0061-2001] Verification Regulation of Eddy Current Flaw Detector---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/JJG0061-2001
JJG
DEPARTMENTAL METROLOGY VERIFICATION REGULATION
FOR THE GENERAL ADMINISTRATION OF CIVIL AVIATION OF
CHINA
JJG (Civil Aviation) 0061-2001
Eddy Current Flaw Detector
Issued on. MARCH 16, 2001
Implemented on. JUNE 01, 2001
Issued by. General Administration of Civil Aviation of China
This Regulation was approved by the General Administration of Civil Aviation of China
on March 16, 2001, and should come into effect since June 01, 2001.
Administrative organization. Planning and Technology Division, General
Administration of Civil Aviation of China.
Drafting organization. Southwest Airlines Aircraft Maintenance Corporation.
The technical articles of this Regulation were entrusted the drafting organization for
interpretation.
Chief drafting staff of this Regulation.
Xu Wanzhong (Southwest Airlines Aircraft Maintenance Corporation)
Participating drafting staffs.
Zhao Rong (Southwest Airlines Aircraft Maintenance Corporation);
Miao Keping (Southwest Airlines Aircraft Maintenance Corporation)
Verification Regulation of Eddy
Current Flaw Detector
JJG (Civil
Aviation) 0061-
Table of Contents
1 Scope... 4
2 Normative References... 4
3 Summary... 4
4 Requirements for Metrological Properties... 4
4.1 Excitation source... 4
4.2 Sensitivity... 5
4.3 Signal-to-noise ratio... 5
4.4 Lift-off effect... 5
4.5 Edge effect... 5
4.6 Tilt performance... 6
5 General Technical Requirements... 6
5.1 Appearance requirements... 6
5.2 The entire machine function... 6
5.3 Display unit... 6
5.4 Alarm performance... 7
5.5 Technical documents and attachments... 7
6 Metrological Instrument Control... 7
6.1 Verification conditions... 7
6.2 Verification items and verification methods... 8
6.3 Processing of verification results... 14
6.4 Verification cycle... 14
Appendix A Standard Specimen... 15
Appendix B Verification Certificate Format... 16
Appendix C Verification Rejection Notice Format... 18
Appendix D Verification Record Format... 19
Verification Regulation of Eddy Current Flaw
Detector
1 Scope
This Regulation is applicable to the initial verification, subsequent verification and in-
use inspection of the probe coil eddy current flaw detector (hereinafter referred to as
the eddy current instrument). The verification of other types of eddy current instruments
can refer to this Regulation.
2 Normative References
JJF 1001-1998 General Terms in Metrology and Their Definitions
JJF 1002-1998 The Rules for Drafting National Metrological Verification
Regulation
GB/T 12604.6-1990 Terminology for Nondestructive Testing - Eddy Current Testing
MH/T 3002.5-1997 Nondestructive Testing in Aircraft - Eddy Current Testing
When using this Regulation, care shall be taken to use the currently valid versions of
the above cited documents.
3 Summary
The eddy current instrument is an electronic device that uses the principle of
electromagnetic induction to perform non-destructive testing of metal materials and
their finished parts, and is widely used in civil aircraft maintenance and inspection.
4 Requirements for Metrological Properties
4.1 Excitation source
4.1.1 Output frequency error△f ≤±10%;
4.2 Sensitivity
4.2.1 For the eddy current instrument whose gain can be adjusted quantitatively, when
the gain is lower than the maximum gain (no obvious electrical noise) by 6dB, move
the probe to sweep the 0.5mm deep artificial defect of the standard specimen; and the
amount of change displayed by the eddy current instrument shall be no less than 75%
of the full scale.
4.3 Signal-to-noise ratio
The ratio OF, when the probe moves to a 0.2mm deep artificial defect on the specimen,
the amount of change S displayed by the eddy current instrument TO the amount of
change N displayed by the eddy current instrument, when the probe moves on the
standard specimen substrate (S/N), which shall be no less than 3.
4.4 Lift-off effect
Put a layer of non-conductive material with a thickness of 0.05mm~0.1mm between
the standard specimen and the probe. When the probe and the non-conductive
material are moved to the standard specimen substrate, the amount of change
displayed by the eddy current instrument shall be no greater than 5% of the full scale.
4.5 Edge effect
4.6 Tilt performance
4.6.1 Change the angle between the axis of the probe coil and the normal of the
specimen surface from 0° (vertical) to 20°. At this time, the amount of change displayed
by the eddy current instrument shall be no greater than 10% of the full scale.
5 General Technical Requirements
5.1 Appearance requirements
5.1.1 The appearance of the tested eddy current instrument shall be intact; all parts
shall be firm and reliable; the knobs shall be positioned accurately; the adjustment
shall be smooth; the switch contact shall be good; the operation shall be flexible; and
there shall be no mechanical damage that affects the operation.
5.2 The entire machine function
5.3 Display unit
Press the balance button, and the pointer (bright spot) on the display panel shall return
to the balance point.
5.4 Alarm performance
5.4.1 The alarm threshold shall be adjustable.
5.5 Technical documents and attachments
The eddy current instrument sent for inspection shall be accompanied with the
instrument operation manual and circuit diagram, commonly used probes, probe
cables and chargers. A faulty eddy current instrument shall have a fault record.
6 Metrological Instrument Control
6.1 Verification conditions
6.1.1 Verification environment.
6.1.2 Metrology standards.
6.1.2.1 Oscillometer.
6.1.3 Supporting equipment.
6.1.3.1 Standard probe.
It has passed the comprehensive performance inspection, is not worn and damaged,
and can be matched with the eddy current instrument.
6.1.3.5 Non-conductive materials.
PTFE film or other wear-resistant insulating film with a thickness of 0.05mm~0.10mm
and a thickness of 0.15mm can be stacked in multiple layers.
6.2 Verification items and verification methods
6.2.1 The verification items are shown in Table 1.
6.2.3.2 Power on the instrument, and read the output signal frequency from the
frequency meter after it stabilizes; record it as f; calculate the frequency error from the
following Formula; and fill it in Table D2 of Appendix D.
6.2.4 Excitation source output frequency stability verification.
Select the middle frequency point in the common frequency range to test.
6.2.4.1 The verification equipment and connections are shown in Figure 1.
6.2.7.6 Alarm performance inspection.
6.2.7.7 Low temperature test.
After placing the eddy current instrument in a low temperature test chamber at
0°C±5°C for 30min; repeat the operation in 6.2.7.1; fill in the results in Table D6 of
Appendix D.
6.3 Processing of verification results
The eddy current instrument that has passed the verification shall be issued with a
certificate of qualification; the unqualified eddy current instrument shall be issued a
notice of unqualified verification, and the unqualified items shall be indicated.
6.4 Verification cycle
The verification period of the eddy current instrument can be determined according to
the specific usage, but the longest period shall not exceed 12 months.
JJG
DEPARTMENTAL METROLOGY VERIFICATION REGULATION
FOR THE GENERAL ADMINISTRATION OF CIVIL AVIATION OF
CHINA
JJG (Civil Aviation) 0061-2001
Eddy Current Flaw Detector
Issued on. MARCH 16, 2001
Implemented on. JUNE 01, 2001
Issued by. General Administration of Civil Aviation of China
This Regulation was approved by the General Administration of Civil Aviation of China
on March 16, 2001, and should come into effect since June 01, 2001.
Administrative organization. Planning and Technology Division, General
Administration of Civil Aviation of China.
Drafting organization. Southwest Airlines Aircraft Maintenance Corporation.
The technical articles of this Regulation were entrusted the drafting organization for
interpretation.
Chief drafting staff of this Regulation.
Xu Wanzhong (Southwest Airlines Aircraft Maintenance Corporation)
Participating drafting staffs.
Zhao Rong (Southwest Airlines Aircraft Maintenance Corporation);
Miao Keping (Southwest Airlines Aircraft Maintenance Corporation)
Verification Regulation of Eddy
Current Flaw Detector
JJG (Civil
Aviation) 0061-
Table of Contents
1 Scope... 4
2 Normative References... 4
3 Summary... 4
4 Requirements for Metrological Properties... 4
4.1 Excitation source... 4
4.2 Sensitivity... 5
4.3 Signal-to-noise ratio... 5
4.4 Lift-off effect... 5
4.5 Edge effect... 5
4.6 Tilt performance... 6
5 General Technical Requirements... 6
5.1 Appearance requirements... 6
5.2 The entire machine function... 6
5.3 Display unit... 6
5.4 Alarm performance... 7
5.5 Technical documents and attachments... 7
6 Metrological Instrument Control... 7
6.1 Verification conditions... 7
6.2 Verification items and verification methods... 8
6.3 Processing of verification results... 14
6.4 Verification cycle... 14
Appendix A Standard Specimen... 15
Appendix B Verification Certificate Format... 16
Appendix C Verification Rejection Notice Format... 18
Appendix D Verification Record Format... 19
Verification Regulation of Eddy Current Flaw
Detector
1 Scope
This Regulation is applicable to the initial verification, subsequent verification and in-
use inspection of the probe coil eddy current flaw detector (hereinafter referred to as
the eddy current instrument). The verification of other types of eddy current instruments
can refer to this Regulation.
2 Normative References
JJF 1001-1998 General Terms in Metrology and Their Definitions
JJF 1002-1998 The Rules for Drafting National Metrological Verification
Regulation
GB/T 12604.6-1990 Terminology for Nondestructive Testing - Eddy Current Testing
MH/T 3002.5-1997 Nondestructive Testing in Aircraft - Eddy Current Testing
When using this Regulation, care shall be taken to use the currently valid versions of
the above cited documents.
3 Summary
The eddy current instrument is an electronic device that uses the principle of
electromagnetic induction to perform non-destructive testing of metal materials and
their finished parts, and is widely used in civil aircraft maintenance and inspection.
4 Requirements for Metrological Properties
4.1 Excitation source
4.1.1 Output frequency error△f ≤±10%;
4.2 Sensitivity
4.2.1 For the eddy current instrument whose gain can be adjusted quantitatively, when
the gain is lower than the maximum gain (no obvious electrical noise) by 6dB, move
the probe to sweep the 0.5mm deep artificial defect of the standard specimen; and the
amount of change displayed by the eddy current instrument shall be no less than 75%
of the full scale.
4.3 Signal-to-noise ratio
The ratio OF, when the probe moves to a 0.2mm deep artificial defect on the specimen,
the amount of change S displayed by the eddy current instrument TO the amount of
change N displayed by the eddy current instrument, when the probe moves on the
standard specimen substrate (S/N), which shall be no less than 3.
4.4 Lift-off effect
Put a layer of non-conductive material with a thickness of 0.05mm~0.1mm between
the standard specimen and the probe. When the probe and the non-conductive
material are moved to the standard specimen substrate, the amount of change
displayed by the eddy current instrument shall be no greater than 5% of the full scale.
4.5 Edge effect
4.6 Tilt performance
4.6.1 Change the angle between the axis of the probe coil and the normal of the
specimen surface from 0° (vertical) to 20°. At this time, the amount of change displayed
by the eddy current instrument shall be no greater than 10% of the full scale.
5 General Technical Requirements
5.1 Appearance requirements
5.1.1 The appearance of the tested eddy current instrument shall be intact; all parts
shall be firm and reliable; the knobs shall be positioned accurately; the adjustment
shall be smooth; the switch contact shall be good; the operation shall be flexible; and
there shall be no mechanical damage that affects the operation.
5.2 The entire machine function
5.3 Display unit
Press the balance button, and the pointer (bright spot) on the display panel shall return
to the balance point.
5.4 Alarm performance
5.4.1 The alarm threshold shall be adjustable.
5.5 Technical documents and attachments
The eddy current instrument sent for inspection shall be accompanied with the
instrument operation manual and circuit diagram, commonly used probes, probe
cables and chargers. A faulty eddy current instrument shall have a fault record.
6 Metrological Instrument Control
6.1 Verification conditions
6.1.1 Verification environment.
6.1.2 Metrology standards.
6.1.2.1 Oscillometer.
6.1.3 Supporting equipment.
6.1.3.1 Standard probe.
It has passed the comprehensive performance inspection, is not worn and damaged,
and can be matched with the eddy current instrument.
6.1.3.5 Non-conductive materials.
PTFE film or other wear-resistant insulating film with a thickness of 0.05mm~0.10mm
and a thickness of 0.15mm can be stacked in multiple layers.
6.2 Verification items and verification methods
6.2.1 The verification items are shown in Table 1.
6.2.3.2 Power on the instrument, and read the output signal frequency from the
frequency meter after it stabilizes; record it as f; calculate the frequency error from the
following Formula; and fill it in Table D2 of Appendix D.
6.2.4 Excitation source output frequency stability verification.
Select the middle frequency point in the common frequency range to test.
6.2.4.1 The verification equipment and connections are shown in Figure 1.
6.2.7.6 Alarm performance inspection.
6.2.7.7 Low temperature test.
After placing the eddy current instrument in a low temperature test chamber at
0°C±5°C for 30min; repeat the operation in 6.2.7.1; fill in the results in Table D6 of
Appendix D.
6.3 Processing of verification results
The eddy current instrument that has passed the verification shall be issued with a
certificate of qualification; the unqualified eddy current instrument shall be issued a
notice of unqualified verification, and the unqualified items shall be indicated.
6.4 Verification cycle
The verification period of the eddy current instrument can be determined according to
the specific usage, but the longest period shall not exceed 12 months.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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