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JJG 356-2021: (Verification Regulations for Pneumatic Measuring Instruments)
Status: Valid JJG 356: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 356-2021 | English | 359 |
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4 days [Need to translate]
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(Verification Regulations for Pneumatic Measuring Instruments)
| Valid |
JJG 356-2021
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| JJG 356-2004 | English | 599 |
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3 days [Need to translate]
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Verification Regulation of Pneumatic Measuring Instrument for Micrometers
| Obsolete |
JJG 356-2004
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| JJG 356-1984 | English | 639 |
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5 days [Need to translate]
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Verification Regulation of Float Type Air Comparator
| Obsolete |
JJG 356-1984
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PDF similar to JJG 356-2021
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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