JJF 1504-2015 English PDF

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JJF 1504-2015: Calibration Specification for Air Ultrasound Measuring Instruments
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1504-2015	369	Add to Cart	3 days	Calibration Specification for Air Ultrasound Measuring Instruments	Valid

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Basic data

Standard ID: JJF 1504-2015 (JJF1504-2015)
Description (Translated English): Calibration Specification for Air Ultrasound Measuring Instruments
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A59
Classification of International Standard: 17.140
Word Count Estimation: 16,163
Date of Issue: 2015-01-30
Date of Implementation: 2015-04-30
Quoted Standard: JJF 1001; JJF 1034; GB 3102.7; GB/T 20441.4-2006
Regulation (derived from): The State Administration of Quality Supervision, Inspection and Quarantine Announcement 2015 No. 19
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine
Summary: This Standard applies to the frequency range (20 to 50) Calibration of kHz ultrasonic measurement of air.

JJF 1504-2015: Calibration Specification for Air Ultrasound Measuring Instruments

---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.
(Air ultrasonic measuring instrument calibration specification) People's Republic of China National Metrology Technical Specifications Ultrasonic air gauge calibration specification Issued on. 2015-01-30 2015-04-30 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Ultrasonic air gauge calibration specification Focal point. the National Committee of the acoustic measurement technology Main drafting unit. Shanghai Institute of Measurement and Testing China Institute of Metrology Fujian Institute of Metrology Participated in the drafting. Zhejiang Provincial Institute of Metrology This specification metering commissioned National Technical Committee is responsible for interpreting acoustics The main drafters of this specification. An Zhaoliang (Shanghai Institute of Measurement and Testing) He Longbiao (China Institute of Metrology) Lie (Fujian Institute of Metrology) Drafters participate. Zhou Zi Wei (Shanghai Institute of Measurement and Testing) Deng Zheng (Shanghai Institute of Measurement and Testing) Yao Lei (Zhejiang Institute of Metrology)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2. References (1) 3 terminology and units of measurement (1) 3.1 The minimum detectable signal (1) 4 Overview (1) 5 Metrological characteristics (1) 5.1 The minimum detectable signal (1) 5.2 sound sensitivity level (1) 5.3 linear (1) Calibration Condition 6 (2) 6.1 environmental conditions (2) 6.2 standards and other measuring equipment (2) 7 calibration items and calibration methods (2) 7.1 calibration items (2) 7.2 Calibration Method (2) 8 calibration results (4) 8.1 Calibration Data Processing (4) 8.2 calibration certificate (4) 8.3 calibration measurement uncertainty (4) 9 Recalibration interval (5) Appendix A calibration certificate (6) The minimum detectable signal in Appendix B Uncertainty Evaluation Examples (8)

Introduction

This specification is based on JJF 1071-2010 "National Calibration Specifications writing rules," the preparation requirements and coding format System. Making reference to this specification JJG188-2002 "sound level meter" and GB/T 3240-82 "acoustic measurements often Frequency "in the provisions of the test frequency points. This specification is the first release. Ultrasonic air gauge calibration specification

1 Scope

This specification applies to the calibration frequency range (20 ~ 50) kHz ultrasonic meter of air calibration. 2. References This specification references the following documents. JJF 1001 common measurement terms and definitions JJF 1034 acoustic measurement terminology and definitions GB 3102.7 Quantities and units of acoustics GB/T 20441.4-2006 Measurement microphones - Part 4. Specifications for working standard microphones For dated references, only the dated edition applies to this specification; undated reference documents Member, the latest edition (including any amendments) applies to this specification.

3 terminology and units of measurement

This specification uses quantities and units specified in GB 3102.7. JJF 1001 and JJF 1034 and as defined in the following terms and definitions apply to this specification. 3.1 minimum detectable signal minimumdetectablesignal At 1m distance from the sound source, acoustic incident angle is 0 °, to stabilize the detected signal softest sound pressure level.

4 Overview

Air ultrasonic measuring instrument is detecting ultrasonic signal propagating in the air instruments. Mainly used for pipes, gas containers Detecting leakage of the ultrasonic signal generated can also be used in cars, refrigerators and other equipment tightness testing. Ultrasonic air Meter usually consists of a microphone, speakers (or headphones), an amplifier, an average (superimposed), a differential circuit and signal Part of the processing unit or the like.

5 Metrological characteristics

5.1 minimum detectable signal The minimum detectable signal technology requirements are generally given by the manufacturer; the absence of corresponding provisions, the use 40kHz acoustic communication No test can detect the general sound pressure level of 60dB signal (to 20μPa reference). 5.2 sound sensitivity level Sound sensitivity level of technical requirements are generally given by the manufacturer; the absence of corresponding provisions, 40kHz sound signal is used Test, generally not less than -40dB (with 1V/Pa by reference). 5.3 Linear In the factory within the given sound level measurement range and 40kHz signals measured when the input signal level to When changes 10dB sound level instructions should cause the same changes in the general level linearity error does not exceed ± 2dB; when the input signal ......

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