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JJF 1837-2020 English PDF

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US$369.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJF 1837-2020: (Calibration specification for ophthalmology type A ultrasonic measuring instrument)
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1837-2020	369	Add to Cart	4 days	(Calibration specification for ophthalmology type A ultrasonic measuring instrument)	Valid

Similar standards

GB/T 3222.2 GB/T 3222.1 JJG 188 JJG 1190 JJF 2012 JJF 1934

Basic data

Standard ID: JJF 1837-2020 (JJF1837-2020)
Description (Translated English): (Calibration specification for ophthalmology type A ultrasonic measuring instrument)
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A59
Word Count Estimation: 16,149
Date of Issue: 2020-07-02
Date of Implementation: 2021-01-02
Regulation (derived from): Announcement No. 29 (2020) of the State Administration for Market Regulation
Issuing agency(ies): State Administration for Market Regulation

JJF 1837-2020: (Calibration specification for ophthalmology type A ultrasonic measuring instrument)

---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.
(Calibration specification for ophthalmology type A ultrasonic measuring instrument) National Metrology Technical Specification of the People's Republic of China Specification for calibration of ophthalmic A-type ultrasonic measuring instrument Published on 2020-07-02 2021-01-02 Implementation Released by the State Administration for Market Regulation Ophthalmology Type A Ultrasound Measuring Instrument Calibration specification Focal Point. National Medical Metrology Technical Committee Main drafting unit. China Institute of Metrology China Institute of Testing Technology Wuxi Metrology and Testing Institute This specification entrusts the National Medical Metrology Technical Committee to be responsible for the interpretation The main drafters of this specification. Sun Jie (China Institute of Metrology) Zhang Conghua (China Institute of Testing Technology) Wu Xiang (Wuxi Metrology and Testing Institute) Participating drafters. Hu Zhixiong (China Institute of Metrology) Shi Min (Wuxi Metrology and Testing Institute) Li Fei (China Institute of Metrology) Wan Suming (Wuxi Metrology and Testing Institute)

content

Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Terms and units of measurement(1) 3.1 Terminology (1) 3.2 Units of measurement (1) 4 Overview(1) 5 Metrology Characteristics(2) 5.1 Axial length(2) 5.2 Measuring range(2) 6 Calibration Conditions(2) 6.1 Environmental conditions (2) 6.2 Measuring standards and other equipment(2) 7 Calibration items and calibration methods (2) 7.1 Appearance and functional inspection (2) 7.2 Axial length(3) 7.3 Measuring range(3) 8 Expression of calibration results (4) 8.1 Calibration records (4) 8.2 Processing of calibration results (4) 9 Recalibration interval(5) Appendix A Ophthalmology Type A Ultrasound Measurement Instrument Calibration Original Record (Recommended) Format (6) Appendix B Calibration Certificate Inner Page (Recommended) Format (7) Appendix C (20~30)℃ Temperature Range Theoretical Sound Velocity Table of Degassed Water(9) Appendix D Example of Uncertainty Assessment of Axial Length Calibration (10)

Introduction

This specification is based on JJF 1001-2011 "General Metrology Terms and Definitions", JJF 1059.1-2012 "Measuring Evaluation and Representation of Certainty", JJF 1071-2010 "Rules for Compilation of National Metrology Calibration Specifications". The formulation of this specification refers to YY/T 0107-2015 "Ophthalmology A-Type Ultrasonic Measuring Instrument", GB/T 18022- 2000 "Measuring Method of Sound Velocity and Attenuation Coefficient of Longitudinal Wave in Rubber and Plastics in the Acoustic 1~10MHz Frequency Range". This specification is published for the first time. Specification for calibration of ophthalmic A-type ultrasonic measuring instrument

1 Scope

This specification applies to ophthalmic A-type ultrasonic measuring instruments (including other corneas based on the principle of ultrasonic echo biometry Pachymeters, Axial Length Measuring Instruments) calibration.

2 Reference documents

This specification references the following documents. GB/T 18022 Acoustic Measurement of Longitudinal Wave Sound Velocity and Attenuation Coefficient of Rubber and Plastics in the Frequency Range of 1~10MHz method YY/T 0107 Ophthalmology Type A Ultrasound Measuring Instrument For dated references, only the dated version applies to this specification; for undated references The latest version (including all amendments) applies to this specification.

3 Terminology and units of measurement

3.1 Terminology 3.1.1 axial length Note. There are different measurement methods for axial length, the ultrasonic measurement method measures from the anterior surface of the cornea to the inner retinal limiting membrane (ILM) The distance between them; the optical measurement method measures the distance from the anterior surface of the cornea to the retinal pigment epithelium (RPE). 3.1.2 Echobiometry A method of measuring axial length by measuring the time between ultrasound echoes produced by two tissues in the eyeball. 3.1.3 Phakicmode The test mode of the meter, which is used to measure the axial length of phakic eyes. 3.2 Units of measurement Name of the unit of measure for length or thickness. mm; symbol. mm.

4 Overview

Ophthalmic A-type ultrasonic measuring instrument (hereinafter referred to as ophthalmic A-ultrasound) The ultrasonic measuring equipment for measuring the axial length and corneal thickness of the human eye is mainly composed of a host and a measuring probe. ophthalmology According to the detection depth, the measurement probes of A-ultrasound can be divided into probes for measuring axial length and probes for measuring corneal thickness. Measurement When the ophthalmic A-ultrasound probe contacts the patient's ocular surface vertically, it emits an ultrasonic beam into the eye and receives the reflected echoes, and the echoes are converted into The waveform of the amplitude intensity is displayed on the graph with the ultrasonic propagation time as the abscissa. The abscissa of the waveform when the ultrasound propagates The interval represents the different depths of the detection echo; the ordinate echo amplitude represents the ultrasonic reflection coefficient of the measured object. from back The wave distribution, envelope width and amplitude can accurately measure the human axial length and corneal thickness. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJF 1837-2020_English be delivered?

Answer: Upon your order, we will start to translate JJF 1837-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJF 1837-2020_English with my colleagues?

Answer: Yes. The purchased PDF of JJF 1837-2020_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.