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JJG 356-2021 English PDF

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JJG 356-2021: (Verification Regulations for Pneumatic Measuring Instruments)
Status: Valid

JJG 356: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 356-2021English359 Add to Cart 4 days [Need to translate] (Verification Regulations for Pneumatic Measuring Instruments) Valid JJG 356-2021
JJG 356-2004English599 Add to Cart 3 days [Need to translate] Verification Regulation of Pneumatic Measuring Instrument for Micrometers Obsolete JJG 356-2004
JJG 356-1984English639 Add to Cart 5 days [Need to translate] Verification Regulation of Float Type Air Comparator Obsolete JJG 356-1984

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Basic data

Standard ID JJG 356-2021 (JJG356-2021)
Description (Translated English) (Verification Regulations for Pneumatic Measuring Instruments)
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A52
Word Count Estimation 18,162
Issuing agency(ies) State Administration for Market Regulation

JJG 356-2021: (Verification Regulations for Pneumatic 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.
(Verification Regulations for Pneumatic Measuring Instruments) People's Republic of China National Metrological Verification Regulations Pneumatic measuring instrument Published on 2021-07-28 2022-01-28 Implementation Released by the State Administration for Market Regulation Pneumatic measuring instrument verification regulations Replacing JJG 356-2004 Focal Point. National Technical Committee on Geometric Length Measurement Drafting unit. Henan Institute of Metrology Tianjin Institute of Metrology Supervision and Testing Jilin Provincial Institute of Metrology Sanmenxia Zhongyuan Measuring Instrument Co., Ltd. Zhengzhou Xintai Precision Measuring Instrument Co., Ltd. This regulation is entrusted to the National Technical Committee of Geometry and Length Measurement to be responsible for the interpretation The drafters of this regulation. Jia Xiaojie (Henan Institute of Metrology) Huang Yuzhu (Henan Institute of Metrology) Su Qinglei (Henan Institute of Metrology) Lu Ruijun (Tianjin Institute of Metrology, Supervision and Testing) Dou Yanhong (Jilin Institute of Metrology) Cai Yawei (Sanmenxia Zhongyuan Measuring Instrument Co., Ltd.) Zhou Lei (Zhengzhou Xintai Precision Measuring Instrument Co., Ltd.)

content

Introduction (Ⅱ) 1 Scope(1) 2 Terms (1) 3 Overview(1) 4 Measurement performance requirements(3) 4.1 Zero adjustment range(3) 4.2 Adjustment range of magnification (3) 4.3 Indication error(3) 4.4 Repeatability(3) 4.5 Discrimination Threshold(3) 4.6 Stability(3) 4.7 Step response time(3) 4.8 Indication change of multi-tube interaction (3) 4.9 Maximum measuring gap(4) 4.10 Influence of Air Supply Pressure Change on Indication (4) 5 General technical requirements(4) 5.1 Appearance(4) 5.2 Interaction of each part (5) 6 Measuring Instrument Control(5) 6.1 Verification Conditions (5) 6.2 Verification items (5) 6.3 Verification method (6) 6.4 Processing of Verification Results (8) 6.5 Verification Period(8) Appendix A Standard Pneumatic Axial Sensor (Probe) Technical Requirements (9) Appendix B Verification Certificate/Verification Result Notification Inner Page Information Format (10)

Introduction

JJF1002 "Rules for the Compilation of National Metrology Verification Regulations", JJF1001 "General Metrology Terms and Definitions" and JJF1059.1 "Assessment and Representation of Measurement Uncertainty" together constitute the basic series supporting the formulation and revision of this Regulation specification. This regulation is the revision of JJG 356-2004 "Pneumatic Measuring Instrument", the revision process refers to JB/T 3760- 2008 "Buoy Pneumatic Measuring Instrument", JB/T 12203-2015 "Electronic Column Gas Electric Micrometer". with JJG 356-2004 In comparison, the main technical changes except editorial modifications are as follows. --- The term of nominal magnification is re-described, and the term of indication range is deleted; --- Modify the "indication variability" test item to "repeatability", and the test method has been modified; --- Removed the "full range" indicator; --- Remarked Figure 1 and Figure 2, and added Figure 3 Intelligent Electronic Column Pneumatic Measuring Instrument Display intention; --- Modified the technical indicators of the indication error of the buoy-type pneumatic measuring instrument and the corresponding verification method; ---Modified the technical indicators of the step response time and initial gap of the electronic column pneumatic measuring instrument; --- Modified the verification method of the maximum measurement gap; --- Deleted the method of using the inclined block type micrometer calibrator as the standard for calibrating the pneumatic measuring instrument; --- Modify the description of "discrimination power" and "response time" to "discrimination threshold" and "step response time"; --- The zero adjustment range and magnification adjustment range of the intelligent electronic column pneumatic measuring instrument are not verified; --- Added Appendix A and Appendix B. The previous versions of this regulation have been released as follows. ---JJG 356-2004; ---JJG 356-1984. Pneumatic measuring instrument verification regulations

1 Scope

This regulation applies to buoy-type pneumatic measuring instruments and graduations with graduation values of 0.5μm, 1μm, 2μm and 5μm The initial verification, subsequent verification and Inspection in use.

2 Terminology

The following terms and definitions apply to this protocol. 2.1 Nominal magnification The ratio of the ruler spacing to the division value on the scale. 2.2 Initial clearance The minimum distance between the pneumatic axial sensor (referred to as "probe") and the measured surface that meets the accuracy requirements of the measuring instrument gap. 2.3 Zero gap The initial gap plus one-half the required gap of the measuring range. 2.4 Termination gap The initial clearance plus the required clearance for the measurement range.

3 Overview

Pneumatic measuring instrument is a non-contact measuring instrument, which can be divided into buoy pneumatic measuring instrument according to its display form (see Figure 1) and electronic column pneumatic measuring instrument (see Figure 2 and Figure 3). The buoy-type pneumatic measuring instrument is the change of the measured size It is converted into the change of the position of the buoy in the tapered glass tube, so as to realize the size comparison measurement instrument; electronic column pneumatic measurement instrument. The measuring instrument is the change of the measured size by the pneumatic sensor, which is converted into an electrical signal by a gas-electric converter, and passed through an electronic column. (Light Emitting Diode Unit) shows the comparative measuring instrument of the measured size; the intelligent electronic column pneumatic measuring instrument has Intelligent keys, you can directly adjust the zero and magnification. Pneumatic measuring instruments are matched with various types of pneumatic sensors It can be used together to perform a variety of measurement tasks, such as the thickness, inner diameter, outer diameter, roundness, parallelism of the workpiece. and other parameters, it can also be used for multi-unit splicing detection. Its model specifications are shown in Table 1. Table 1 Model Specifications of Pneumatic Measuring Instruments Category Nominal Magnification Graduation value μm Measuring range μm initial gap μm buoypneumatic Measuring instrument 1000×5 -80~80 50 2000×2 -40~40 40 5000×1 -15~15 35 10000×0.5 -8~8 32

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