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JJF 1938-2021 English PDF

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US$469.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJF 1938-2021: Calibration Specification for Digital Barometric Altimeters
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1938-2021	469	Add to Cart	4 days	Calibration Specification for Digital Barometric Altimeters	Valid

Similar standards

JJF 1943 GB/T 36126 GB/T 1885 JJF 1942 JJF 1940

Basic data

Standard ID: JJF 1938-2021 (JJF1938-2021)
Description (Translated English): Calibration Specification for Digital Barometric Altimeters
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A53
Classification of International Standard: 17.100
Word Count Estimation: 21,236
Date of Issue: 2021-12-08
Date of Implementation: 2022-06-08
Issuing agency(ies): State Administration for Market Regulation
Summary: This standard applies to the calibration of newly manufactured, in-use and repaired digital barometric altimeters whose measurement altitude is below 11000m.

JJF 1938-2021: Calibration Specification for Digital Barometric Altimeters

---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.
National Metrology Technical Specifications of the People's Republic of China Calibration specification for digital barometric altimeter Released on 2021-12-08 2022-06-08 Implementation Released by the State Administration for Market Regulation Calibration specification for digital barometric altimeter Barometric Altimeters Responsible unit: Meteorological Pressure Meteorological Committee of National Meteorological Measuring Instruments Measuring Technology Committee Subcommittee Main drafting unit: Meteorological Observation Center of China Meteorological Administration Participating in the drafting unit: Guangdong Meteorological Observation Data Center Shanxi Atmospheric Sounding Technical Support Center Atmospheric Sounding Technology and Equipment Support Center of Tibet Autonomous Region Heilongjiang Meteorological Data Center This specification entrusts the Meteorological Pressure Sub-Technical Committee of the National Meteorological Measuring Instruments Measuring Technical Committee committee responsible for explaining The main drafters of this specification: Ding Hongying (Meteorological Observation Center of China Meteorological Administration) Li Jianying (Meteorological Observation Center of China Meteorological Administration) Yu Hejun (Meteorological Observation Center of China Meteorological Administration) Participating drafters: Li Xindi (Guangdong Meteorological Observation Data Center) Hao Chile (Shanxi Atmospheric Sounding Technical Support Center) Chen Hua (Atmospheric Sounding Technology and Equipment Support Center of Tibet Autonomous Region) Huang Qingzhi (Heilongjiang Meteorological Data Center)

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 Metrological characteristics(1) 5:1 Altitude Indication Error(1) 5:2 Altitude return error(2) 6 Calibration conditions(2) 6:1 Environmental conditions (2) 6:2 Measurement standards and auxiliary equipment (2) 7 Calibration Items and Calibration Methods(3) 7:1 Preparations before calibration(3) 7:2 Altitude indication error calibration (3) 7:3 Altitude Return Error Calibration(3) 7:4 Data processing (4) 8 Calibration Results(4) 9 Recalibration interval(5) Appendix A Functional relationship between altitude and air pressure (6) Appendix B Additional error correction method caused by height difference of working medium (8) Appendix C Calibration Original Record Reference Format (9) Appendix D Altimeter Calibration Certificate Inner Page Format Page 2 (10) Appendix E Altimeter Calibration Certificate Inner Page Format Page 3 (11) Appendix F Examples of Calibration Uncertainty Evaluation of Altimeter Altitude Indication Error (12)

Introduction

JJF 1071-2010 "Rules for Compilation of National Metrology Calibration Standards", JJF 1001-2011 "General Metrology Terminology and Definition", JJF 1059:1-2012 "Evaluation and Expression of Measurement Uncertainty" together form the basis of supporting calibration specifications Sex series norms: This specification is published for the first time: Calibration specification for digital barometric altimeter

1 Scope

This specification applies to newly manufactured, in-use and repaired digital air pressure measuring altitudes below 11000m Altimeter calibration:

2 References

This specification references the following documents: JJG683 barometric altimeter JJG1084-2013 Digital Barometer For dated references, only the dated version applies to this specification; for undated references document, its latest version (including all amendments) applies to this specification:

3 Terminology and units of measurement

3:1 Terminology 3:1:1 geopotential height In the earth's gravitational field, the height represented by the potential energy of unit mass air relative to sea level: 3:2 Units of measurement The unit of digital barometric altimeter altitude is meter (m) or kilometer (km):

4 Overview

The digital barometric altimeter (hereinafter referred to as the altimeter) adopts the principle of barometric altimeter and outputs data in digital form: (display) A measuring instrument for air pressure and altitude: The altimeter consists of a barometric pressure sensor, a signal processing unit, an output (display) unit etc: Its working principle is that the atmospheric pressure acts on the air pressure sensor to make it output a corresponding electrical signal, which is determined by After processing by the signal processing unit, the altitude value corresponding to the air pressure is displayed:

5 Metrological characteristics

5:1 Altitude Indication Error The height indication error of the altimeter shall not exceed the maximum allowable error value specified in Table 1: ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJF 1938-2021_English be delivered?

Answer: Upon your order, we will start to translate JJF 1938-2021_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 1938-2021_English with my colleagues?

Answer: Yes. The purchased PDF of JJF 1938-2021_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.