This procedure applies to the initial calibration, subsequent calibration and in-use inspection of universal calipers with graduation values ​​(vernier and gauge types) or resolution (digital display types) of 0.01, 0.02, 0.05 and 0.10 mm and a measuring range upper limit of 2000 mm. JJG 30-2002 Verification Procedure for Universal Calipers JJG30-2002 Standard download decompression password: www.bzxz.net
This procedure applies to the initial calibration, subsequent calibration and in-use inspection of universal calipers with graduation values ​​(vernier and gauge types) or resolution (digital display types) of 0.01, 0.02, 0.05 and 0.10 mm and a measuring range upper limit of 2000 mm.

Verification Regulation of the People's Republic of China. JJG30—2002
Universal Calipers
Current Calipers
2002 - 04-15 Issued
2002-07-01 Implementation
National Quality Supervision, Inspection and Quarantine General Administration Issued FIG30-2002
Verification Regulation of Current Calipers
JJG 30—202
Replaces JJG 30—1992
JJG 192--1979
JJG400—1985
JJG526—1988
.JJG32—1987
This regulation was approved by the State Administration of Quality Supervision, Inspection and Quarantine on April 15, 2002, and came into effect on July 1, 2002.
Responsible unit:
Drafting unit:
Joint drafting unit:
Jin Guo Geometric Measurement and Measurement Technical Committee Shaanxi Provincial Measurement and Testing Institute
Shandong Xi'an Optical Precision Research Institute Shaanxi Blower Group Co., Ltd.
Guangdong Measurement
This regulation is responsible for the interpretation of the National Geometric Measurement and Measurement Technical Committee. The main drafters of this regulation:
Shi Cai Dian
Participating drafters:
Liu Yanan
Zhang Shengli
Wu Fengshan
JJG31—2002
(Shaanxi Provincial Measurement and Testing Institute)
[Lingxi Provincial Measurement and Testing Institute]
(Shanxi Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences) (Shaanxi Blower (Group) Co., Ltd.) (Guangzhou Machinery)
References
4 Performance requirements of measuring instruments
Width and width difference of ruler marking
Surface roughness of measured surface
Flatness of surface
JIG30—2002
Basic dimensions of internal measurementParallelism
Scale and parallelism of internal measurement
Zero value error
Indication variability
Indication stability of digital display
Indication error
General technical requirements
5.1 Appearance
Interaction of various parts
Relative position of parts
Measurement instrument control
Verification conditions
Verification items and verification equipment
Verification method
Processing of verification results
Verification cycle
1 Scope
31G30—2002
Verification procedure for universal calipers
This procedure is applicable to the initial verification, subsequent verification and in-use inspection of universal calipers with graduation value (vernier type, dial type) or resolution (digital type! 0.1, 0.02, 0.0 and 1.1) mm and a measuring range of up to 20 mm. 2 References
This procedure refers to the following documents:
I1(K-1998 General Calibration Techniques and Definitions
JFF1059—1999 Evaluation and Expression of Uncertainty in Measurement T1214.1[214.4—196 Vernier calipers When using this specification, attention should be paid to using the currently valid versions of the above-mentioned references. 3 Overview General calipers are used to measure external and internal dimensions, holes, stepped holes, retaining holes and other related dimensions. The main structural types are vernier calipers (see Figures 1, 2, and 3), electronic digital calipers (see Figures 4 and 5), dial calipers (see Figure 6), depth vernier calipers (see Figure 7), and electronic digital depth calipers (see Figure 8). They are used for internal and external measurement, external claw ring calipers, main scales, and depth measurements, and external measurement, and are used for external measurement. 30——20K2
F scale
wu dux
external melon
vernier, scale
accurate tight Shi Yao
excited guard
1 cup scale
6 fe 19+ to5 156 1n: f1gx 1g 29amlirhltidnkwduannrhnt n
Beam scale
Express dynamic nuclear armor
National highway city
Five-out internal measurement
JJG30—2002
Fixed frequency
Digital maximum indicator scale body
Environmental nuclear department
Scale body scale scene solid teaching digital indicator
Knife L internal measurement
Fixed ground nails
To the position
Function potassium
Micro-agent pipe
Ten scales
Deep waste measuring rod
Depth measuring bearing
Deep East
Depth measuring surface
Measurement plate surface
Micro surface
Polyester nails
JJG 30—2(02
sluniuin
caliper fastening screw
4 metrological performance requirements
4.1 Scale marking degree and width difference
New scale
Digital display scale body
Functional press
4.1.1 The degree and width difference of the main scale and vernier scale markings of the vernier caliper shall conform to the provisions of the table! Table [Width and brightness difference of ruler markings
Graduation value
Width of ruler markings
0.u8-0.18
Width difference of ruler markings
JG30-2002
41.2 The width of the ten ruler markings and ruler markings with a dial gauge and the width of the pointer end should be (center 10~0.20) mm: the width difference should not exceed 0.(4mm. 4.2 The surface adhesion of the measuring surface
should not exceed the provisions of Table 2:
The surface displacement (force component) of the measuring surface in Table 2
0.03, 0.0
The bone surface is not measured
4.3 The flatness of the parent surface
shall not exceed the provisions of Table 3.
Maximum range
0 - 1000
>1 000 -2 00
Table difference R,rent
Inner bone measuring surface
Depth caliper's reference
Surface to parent surface
Table 3 Flatness of measuring surface
Outside measurement of half-meter
Determination: to the edge 0.2 rnrn 4.4 Basic size and parallelism of circular base. Depth measurement. When the datum surface of the caliper is in the same plane, the two measurements are combined. The basic size of the arc is not a basic size. The new one should be 1 or 20mm. The deviation should meet the requirements of Article 4. The basic size after processing is allowed to be an integer of 0.1mm. It can be an integer multiple of the caliper graduation value when it is used. It should be indicated on the inner page of the certificate. Parallelism should not exceed the requirements of Table 4. Table 4 Basic size and parallelism of the caliper jaws. 0.01, 0.02 |4.5 The dimensions and parallelism of the internal measurement shall comply with the provisions of Table 5.
4.6 Zero value error
± 0.012
Parallelism
4.6. When the two measuring surfaces of the vernier caliper are in contact (the scale base of the depth vernier caliper is measured on the same plane), the "read" mark and "belong" mark on the vernier and the corresponding mark on the scale shall coincide with each other. The degree of coincidence shall comply with the provisions of Table 6. 0.01-0.12
302002
Table 50000 internal measurement of size and parallelism
a few normal low double correct
new edge after repair
the mark and the "tail" mark are in line with the main mark to the new
standard will be effective
"F" in the forest
.6.2 The length of the scale should not be measured when the scale is long. The needle of the scale should be square: the height of the scale "required" mark should not exceed the width of the mark, and the line should not exceed the width of the mark according to 12:2.1 The variability of the scale should not exceed this point. The caliper should not exceed the door center rm2,8 digital display small object indication total qualitative
1h should not exceed 0.01
2.9 Indication state The indication error of the depth measuring rod at the point of the caliper with a measuring machine shall not exceed the indication error of the graduation letter (division letter). The indication error is as follows: 150 -- 20 200 ~ 300 > 300 -500 > 500 -1000 > 1000 ~ 1500 > 500 -2000 Strict error tolerance 5 General technical requirements 5.1 Appearance L[G 301002
5.1.1 The surface of the caliper should be evenly coated, and the scale markings should be clear, transparent and clean. There should be no rust, scratches, hair, coating shedding, obvious scratches, visible broken lines or roughness, and other defects that affect the appearance quality.
The caliper must have the manufacturer's name or trademark, mark, graduation value and number. After neutralization and sanitation, the caliper is allowed to have appearance defects that do not affect the accuracy of use. 5.1.3
5.2 Relative points of various parts
5.2.1 The ruler should feel smooth when moving along the ruler, and there should be no positive banding or looseness. The digital display should be clean, complete and black. Spots and flickering phenomena, all hinges are stable and work reliably. 5.2.2 The tightening effect is reliable, and the idle travel of the micro-motion device should not exceed 1/4 turn for the newly manufactured one, and should not exceed 1/2 turn after maintenance.
5.3 Relative positions of various parts
5.3.1 The distance from the edge of the vernier scale mark to the main scale mark surface should not be greater than 0.30mm5.3.2 The pointer tip of the circular scale should be 30% to 80% of the short mark, and the gap between the pointer end and the scale mark surface should not exceed the requirements of the table. Table 8 The distance between the end of the pointer and the scale mark surface is
0.01, 0.02
Qiao Measuring Instrument Control
refers to the time between the end of the meter and the scale mark. 0.7
Measuring Instrument Control includes: initial calibration, subsequent calibration and in-use inspection. 6.1 Calibration Conditions
6.1.1 Temperature in the calibration air (20-5)t.
6.1.2 Humidity in the calibration room does not exceed RH 8
6.1.3 Before calibration: the calibration equipment such as the reading caliper and the sample block should be placed on a flat plate or water at the same time. The equilibrium temperature is the same as that specified in Table 9
Table! Break Temperature Time
Measurement Range/m
300 ~ 500
> 50U- - 2 0U0
Lei Yu half board L
Weighing timewww.bzxz.net
On this table
6.2 Verification items and equipment
JJG 302002
The verification items and main verification equipment of general purpose rulers are listed in Table 10. Table 1 Verification items and verification equipment
Verification items
Parts
Name||Parts
Difference between the two
Scale mark
Measurement surface distortion
Measuring surface flatness
Basic scale size within the circle
Parallelism
Annual error
Indication change
Mathematical value determination of display device
Indication error
Main inspection Specified equipment
2-level case ruler
tools are equipped with a microscope, a micro-lock
surface and roughness ratio calibration piece
0.1-level straight ruler, a level flat plate
external micrometer
11mm level 3 single block, an outer diameter "micrometer
1-level middle and lower microscope
1-level half, 3 cameras or 6 equal blocks
3-level 6 forbidden display blocks, 1-level flat plate
calibration medical type
continue to use small
this: not in the middle "+" is,
", "indicates the three not checked is: "=this indicates that the point is not the same as the nuclear nature is not dangerous. 6.3 Verification method
6.3.1 Appearance
Daily inspection. 6.3.2 Observe and test the relative position of each part: 6.3.3 Observe or compare the relative position of the abandoned part with a second-grade ruler. 6.3.4 The width and width tolerance of the ruler mark shall be calibrated with a microscope and a reading microscope. At least 3 marks of the main mark, the avoidance mark and the reading mark shall be selected and the width of the mark shall be determined by the difference between the maximum and minimum widths of the mark under inspection: 6.3.5 The surface roughness of the measuring surface shall be compared with the surface roughness comparison sample. 6.3.6 Flatness of measuring surface
Flatness of external measuring surface The flatness of the coin-level straightedge and depth caliper is checked by the long light barrier method of the first-level knife-shaped ruler. When checking the depth caliper, first place the base surface on the first-level flat plate 1, move the ruler body to make the measuring surface contact with the flat plate, and tighten the needle to make the reference surface and the measuring surface coplanar. During the check, respectively measure the long side, short side and diagonal position 1 of the external measuring surface, the reference surface and the measuring surface 81st grade ruler, 1st grade flat plate
outside micrometer
11mm3rd grade single block, outside micrometer
1st grade middle and lower microscope
1st grade half, 3 cameras or 6 equal blocks
3rd grade 6 forbidden display blocks, 1st grade flat plate
calibration of medical type
continue to use small
this: not in the middle "+" is,
", "indicates the three unchecked is: "=this indicates that the point is not dangerous without nuclear nature. 6.3 Verification method
6.3.1 Appearance
daily inspection. 6.3.2 Observe and test the relative position of each part: 6.3.3 Observe or compare the relative position of the abandoned part with a second-grade ruler. 6.3.4 The width and width tolerance of the ruler mark shall be calibrated with a microscope and a reading microscope. At least 3 marks of the main mark, the avoidance mark and the reading mark shall be selected and the width of the mark shall be determined by the difference between the maximum and minimum widths of the mark under inspection: 6.3.5 The surface roughness of the measuring surface shall be compared with the surface roughness comparison sample. 6.3.6 Flatness of measuring surface
Flatness of external measuring surface The flatness of the coin-level straightedge and depth caliper is checked by the long light barrier method of the first-level knife-shaped ruler. When checking the depth caliper, first place the base surface on the first-level flat plate 1, move the ruler body to make the measuring surface contact with the flat plate, and tighten the needle to make the reference surface and the measuring surface coplanar. During the check, respectively measure the long side, short side and diagonal position 1 of the external measuring surface, the reference surface and the measuring surface 81st grade ruler, 1st grade flat plate
outside micrometer
11mm3rd grade single block, outside micrometer
1st grade middle and lower microscope
1st grade half, 3 cameras or 6 equal blocks
3rd grade 6 forbidden display blocks, 1st grade flat plate
calibration of medical type
continue to use small
this: not in the middle "+" is,
", "indicates the three unchecked is: "=this indicates that the point is not dangerous without nuclear nature. 6.3 Verification method
6.3.1 Appearance
daily inspection. 6.3.2 Observe and test the relative position of each part: 6.3.3 Observe or compare the relative position of the abandoned part with a second-grade ruler. 6.3.4 The width and width tolerance of the ruler mark shall be calibrated with a microscope and a reading microscope. At least 3 marks of the main mark, the avoidance mark and the reading mark shall be selected and the width of the mark shall be determined by the difference between the maximum and minimum widths of the mark under inspection: 6.3.5 The surface roughness of the measuring surface shall be compared with the surface roughness comparison sample. 6.3.6 Flatness of measuring surface
Flatness of external measuring surface The flatness of the coin-level straightedge and depth caliper is checked by the long light barrier method of the first-level knife-shaped ruler. When checking the depth caliper, first place the base surface on the first-level flat plate 1, move the ruler body to make the measuring surface contact with the flat plate, and tighten the needle to make the reference surface and the measuring surface coplanar. During the check, respectively measure the long side, short side and diagonal position 1 of the external measuring surface, the reference surface and the measuring surface 8
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