JJG 990-2004 English PDF

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JJG 990-2004: Verification Regulation for Acoustic Detector
Status: Valid

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JJG 990-2004	449	Add to Cart	3 days	Verification Regulation for Acoustic Detector	Valid

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Basic data

Standard ID: JJG 990-2004 (JJG990-2004)
Description (Translated English): Verification Regulation for Acoustic Detector
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A59
Classification of International Standard: 17.140
Word Count Estimation: 17,190
Date of Issue: 2004-09-21
Date of Implementation: 2004-12-21
Quoted Standard: 2004 technical regulations issued by national metrology (industrial measurement 2005 Volume 15, Issue 1)
Regulation (derived from): 2004 technical regulations issued by national metrology (industrial measurement 2005 Volume 15, Issue 1)
Issuing agency(ies): State Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to the first acoustic detector test, follow-up testing and use test.

JJG 990-2004: Verification Regulation for Acoustic Detector

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Verification Regulation for Acoustic Detector National Metrology Verification Regulations of the People's Republic Acoustic wave detector Released on.2004-09-21 Implementation of.2004-12-21 The General Administration of Quality Supervision, Inspection and Quarantine issued Acoustic detector verification procedure This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 21,.2004, and Implemented on December 21,.2004. Focal Point. National Acoustic Metrology Technical Committee Main drafting unit. Hubei Institute of Metrology and Testing Technology Participated in the drafting unit. China Institute of Metrology Wuhan Yanhai Company This procedure entrusts the National Acoustic Metrology Technical Committee to explain The main drafters of this procedure. Yao Qiuping (Hubei Institute of Metrology and Testing Technology) Luo Yaqing (Hubei Institute of Metrology and Testing Technology) Participate in the drafters. Bian Wenping (China Institute of Metrology) Shi Gengen (Hubei Institute of Metrology and Testing Technology) Tao Lijun (Hubei Institute of Metrology and Testing Technology) Sun Tao (Hubei Institute of Metrology and Testing Technology) Liu Honghua (Wuhan Yanhai Company)

table of Contents

1 Scope (1) 2 Citations (1) 3 terms and units of measurement (1) 3.1 Ultrasonic testing (1) 3.2 Near field length (1) 3.3 Far field (1) 3.4 First wave (1) 3.5 Transducer resonant frequency (1) 3.6 Receive sensitivity (1) 3.7 sound time (2) 4 Overview (2) 5 Metrological performance requirements (2) 5.1 Sound time measurement relative error (2) 5.2 Amplitude measurement level linearity (2) 5.3 Amplitude measurement range (2) 5.4 Transmitting voltage amplitude stability (2) 5.5 Receive System Frequency Response (2) 5.6 Transmit transducer resonant frequency (2) 5.7 Channel isolation (2) 6 General technical requirements (2) 6.1 Appearance, signs and instructions (2) 6.2 Marking (3) 7 Measuring instrument control (3) 7.1 Verification conditions (3) 7.2 Verification project (3) 7.3 Verification method (3) 7.4 Processing of verification results (8) 7.5 Verification cycle (8) Appendix A Example of Uncertainty Analysis (9) Appendix B Verification certificate page format (11) Appendix C Format of the verification result page (12) Acoustic detector verification procedure

1 Scope

This procedure applies to the first verification, subsequent verification and in-use inspection of the acoustic wave detector.

2 Citations

This procedure refers to the following documents. GB/T 3223-1994 "Water acoustic transducer free field calibration method" GB/T 3947-1996 "Acoustic terminology" GB/T 12604.1-1990 "Non-destructive testing of non-destructive testing" GB/T 17252-1998 "Characteristics and measurements of ultrasonic piezoelectric transducers below 100 kHz" JJF1001-1998 General Terms and Definitions JJF1059-1999 "Measurement and Expression of Measurement Uncertainty" JJG 185-1997 "500Hz~1MHz measuring hydrophone" JG/T 5004-1992 "Concrete ultrasonic detector" CECS02.88 "Detecting concrete strength by ultrasonic rebound comprehensive method" CECS21.2000 "Ultrasonic method for detecting internal defects of structural concrete" When using this procedure, care should be taken to use the current valid version of the above cited documents.

3 terms and units of measure

3.1 Ultrasonic testing (ultrasonicdetectionandmeasurement) Methods and techniques for inspecting or determining the non-acoustic properties of materials using ultrasound. 3.2 Near field length (nearfieldlength) The distance between the last sound pressure maxima on the main axis and the wafer surface. 3.3 far field (farfield) In a free field, the sound field in which the instantaneous sound pressure from the sound source is in phase with the instantaneous particle velocity. 3.4 first wave (fastwave) The acoustic wave detector emits an acoustic pulse signal through a medium (air, liquid, solid) and then transmits the transducer Among the received signal waveforms, the first signal is significantly different from noise. The first wave should have a complete cycle with positive peaks And negative peaks. 3.5 Transducer transducer resonance frequency (soundprojectorresonancefrequency) The far-field reference distance of the transmitting transducer in the direction of the specified axis, excited by a sweep signal having a constant voltage amplitude The frequency response function of the transmitted voltage signal is received at the receiving acoustic signal, and the frequency at the maximum value. 3.6 Receive sensitivity (receivingsensitivity) The acoustic wave detector is adjusted to the optimal receiving state, and the intelligent instrument refers to the requirement that the first wave reaches a certain quantitative value. The minimum received signal, the digital instrument refers to the minimum signal that enables the counter to close, three times for analog instruments ......

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