Some standard content:
National Metrology Verification Regulation of the People's Republic of China JJG99—2006
UnRegistered
Weights
Promulgated on September 6, 2006
Implementation on March 6, 2007
General Administration of Quality Supervision, Inspection and Quarantine
Verification Regulation
of Weights
JJG99-2006
Replaces JJG99-1990
JJG273-1991
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 6, 2006, and came into effect on March 6, 2007.
istered
Responsible unit: National Technical Committee on Mass and Density Metrology Main drafting unit: Hubei Institute of Metrology and Testing Technology, China Institute of Metrology
Participating drafting units: Shanghai Institute of Metrology and Testing Technology Guangdong Institute of Metrology
China Institute of Testing Technology
National Railway Weighing and Measuring Station
Beijing Institute of Metrology and Testing Science
Shandong Institute of Metrology
This regulation is entrusted to the National Technical Committee on Mass and Density Metrology to interpret this regulation Main drafters:
Yao Hong (China Institute of Metrology)
Chen Li (Hubei Institute of Metrology and Testing Technology) Participating drafters:
Hui Chengzhi (Shanghai Institute of Metrology and Testing Technology) Wang Weizhong (Guangdong Institute of Metrology) Ding Jingan (China Institute of Metrology) Dang Zhengqiang (China Institute of Testing Technology) Gao Changlu (National Railway Weighing and Weighing Station)
Chen Xue (Beijing Institute of Metrology and Testing Science) Pei Aihua (Shandong Institute of Metrology) JnReg
References
Terms and measurement units
Measurement unitsWww.bzxZ.net
Symbol table
Metrometric performance requirements
Maximum allowable error
Expanded uncertainty
Converted quality
General technical requirements
Surface appearance:||t t||Code box and code mark
Control of measuring instruments
Verification items
Verification conditions
Verification methods
Processing of verification results
Verification period
（10）
.（12)
.（13)
Appendix A Legend of codes of different shapes and sizes
Appendix B
Calculation formula of correction value when codes are combined and comparedCalculation of uncertainty in converted mass measurement
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
Formula for calculating air density
Verification record Recording form,
Verification certificate, verification result notice page format..Original working reference, first-class, second-class code arrangement (25)
.(28)
....(31)
(35)
(37)
(49)
UnRegistered
Magnetic code verification procedure
This procedure adopts the accuracy level and main technical indicators of the code in OIML International Recommendation R111 (2004), and uses the converted quality to express the code quality value, replacing JJG273-1991 "Working Reference Code" Verification Procedure and JJG99-1990 "Code" (Trial) Verification Procedure. The original working reference code, first-class code, second-class code and vacuum quality value are cancelled. 1 Scope
1.1 This regulation is applicable to 1mg to 5000kg codes with accuracy levels of E2, Ez, F., F2, M12, Mz, M23, and M. Codes of each accuracy level should be equipped with corresponding measuring instruments for use. It can be used to calibrate codes and measuring instruments with lower accuracy levels. In actual use of the regulations, the nominal value of the code can be expanded upward or downward within the corresponding accuracy level as required. 1.2 This regulation is applicable to the initial calibration (calibration after repair is deemed as initial calibration, the same below) and subsequent calibration of various codes. 1.3 The definition of code accuracy level is as follows:
1.3.1E2 level code (original working benchmark level code): traceable to national benchmarks and secondary benchmarks, used to calibrate and transfer E2 level codes, used to calibrate corresponding measuring instruments, and used in conjunction with corresponding measuring instruments. 1.3.2E2 grade code: used to verify and transfer F, grade and below codes, used to verify the corresponding measuring instruments, and used in conjunction with the corresponding measuring instruments. F, grade code: used to verify and transfer F2 grade and below silicon codes, used to verify the corresponding measuring instruments, and 1.3.3
used in conjunction with the corresponding measuring instruments.
: F2 grade code: used to verify and transfer M, grade, M2 grade and below codes, used to verify the corresponding 1.3.4
measuring instruments, and used in conjunction with the corresponding measuring instruments. 1.3.5
M, grade code: used to verify and transfer M2 grade, M23 grade and below codes, used to verify the corresponding measuring instruments, and used in conjunction with the corresponding measuring instruments. 1.3.6
M2 grade code: used to verify and transfer M, grade code, used to verify the corresponding measuring instruments, and used in conjunction with the corresponding measuring instruments.
M3 grade code: used to calibrate the corresponding measuring instruments, and used in conjunction with the corresponding measuring instruments. M12 grade and M23 grade codes: used to calibrate the corresponding measuring instruments, and used in conjunction with the corresponding measuring instruments. Special code: used in conjunction with instruments such as piston pressure gauges, force measuring machines (meters), tension gauges, torque meters, torque meters, dynamometers, etc., or used to calibrate standard track scales, codes of other units of measurement derived from mass units. 1.4 Codes used to calibrate measuring instruments (excluding mass comparators): If the actual mass value of the code is used in the calibration process, its expanded uncertainty should not exceed 1/3 of the maximum allowable error of the instrument under the load. If only the nominal value of the code is used during the calibration process, its maximum allowable error should not exceed 1/3 of the maximum allowable error of the instrument under this load. 2
References
This procedure refers to the following documents:
JF1001-1998 "General Metrological Terms and Definitions" JJF1027-1991 "Measurement Error and Data Processing" JJF1059-1999 "Evaluation and Expression of Measurement Uncertainty" GB6682-1992 "Specifications and Test Methods for Water for Analytical Laboratories" OIML International Recommendation RIl1 "EI, E2, FiI, F2, Mi, Mi-2, M2, M2-3, Ms Grade Code" (2004 Edition) (Part 1: Metrological Technical Requirements, Part 2: Measurement Report Form) (R111 Weights of classes E1 E2, Fi, F2, Mi, Mi-2, M2, M2-3, and M3, Parts 1: Metrological and technical requirements and Part2:1
TestReportFormat.Edition2004(E)When using this procedure, attention should be paid to the use of the current valid versions of the above-mentioned references. 3 Terms and measurement units
3.1 Terms
3.1.1 Reduced mass, that is, reduced mass value: When an object reaches equilibrium with a standard device of a certain density in air of a certain temperature and a certain density, the mass of the standard device is the reduced mass of the object. The agreed temperature (trer) is 20℃: the agreed air density (po) is 1.2kg/m: the agreed density of the reduced mass (pret) is 8000kg/m. The relationship between the reduced mass value m and the mass value m in vacuum is: (l-Pe)
m. =m+(V.-V)p. =
m=m+(VV)eo
(1- P)
3.1.2 Density of an object: The quotient of the mass of an object divided by its volume, the formula is 0=3.1.3 Magnetism: An effect that produces an attractive or repulsive force. (1)
3.1.3.1 Magnetic dipole moment (ma): A parameter of a magnetic dipole. The strength of the magnetic field generated by the dipole, that is, the force between the dipole and the magnetized sample, is proportional to the dipole moment. The force between the dipole and the sample with magnetic susceptibility is proportional to the square of the dipole moment. 3.1.3.2 Magnetic field strength (H): The strength of the local magnetic field generated by a magnetic material (such as a permanent magnet or electric current). It is an axial vector related to the magnetic flux density at any point in the magnetic field. 3.1.3.3 Magnetic force (Fi, F2, Fa, Fs: Fmax and F2): The force generated by an external magnetic field to magnetize or suspect a magnetized material.
3.1.3.4 Magnetic permeability (u): The ability of a medium to change a magnetic field. 3.1.3.5 Magnetic constant (magnetic permeability in a vacuum (uo): o=4 yuan×10-7NA-2. 3.1.3.6 (Volume) Magnetic susceptibility (x): The ability of a medium to change a magnetic field. It is related to the magnetic permeability (u) as follows: u/μo=1+u/μo. The value is sometimes also called relative magnetic permeability, μr. 3.1.3.7 (Permanent) Magnetization intensity (M): A parameter that describes the magnetic state of a material object, such as a code, in the absence of an external magnetic field. (Usually, magnetism is a vector, and its gradient and direction are not necessarily constant inside the material). The magnetism of an object produces unevenness in the space around it. Uniform magnetic field, thus generating a magnetic force on other objects in the surrounding area. 3.1.4 Roughness parameter or R-parameter (R. or Rz): Parameter describing the roughness of the side surface of the sample block. The letter R indicates the type of side surface being evaluated, in this case R is the surface roughness. There are different types of surface of the sample block: R parameters for rough surfaces, P parameters for main surfaces, W parameters for curved surfaces. 3.1.5 Scale factor: The ratio of the corresponding indication difference 4I. obtained by placing the sensitivity code, mass ms, on the measuring instrument.
3.1.6 Sensitivity code: Code used to determine the sensitivity of the measuring instrument. 3.2 Units of measurement
3.2.1 Units used
一 Mass: microgram (ug), milligram (mg), gram (g), kilogram (kg) and ton (t): 一 Density: kilogram per cubic meter (kg/m), gram per cubic centimeter (g/cm), milligram per cubic centimeter2
(mg/cm)
3.2.2 The nominal mass value of a code or code group should be equal to 1x10\kg, or 2×10\kg, or 5x10\kg, where "n" represents a positive or negative integer or zero.
3.2.3 Code sequence
3.2.3.1 The sequence of a code group shall consist of one of the following: (1:1:2:5)x10kg:
(l;1:1:2:5)x10\kg:
(1:2:2:5)×10\kg (preferred): (1;2:3:5)x10\kg (applicable only to the code in use): (1;1:2:2:5)x10\kg
A code group may include multiple codes with the same nominal value. 3.3 Symbol table
JMPE/mol
SI unit
Tide Density of moist air
Indication difference of balance, where 4/-I-,
Change in indication of balance due to sensitivity codeMaximum permissible error of base code
Mass difference, usually the mass difference between the tested code and the standard codeThe average value of a group or series of measurements of the same measurement sequence with approximately the same standard deviation
Difference in reduced mass
Reference value of air density: equal to the agreed density of 1.2kg/m code, for example 8000kg/m
Maximum permissible error of code
Correction for air buoyancy Positive factor
For recording sensitivity, the air buoyancy correction factor is used to correct the mass of the code in vacuum, that is, the converted mass correction value of the m-mo code, that is, me-mo
Scale division value
Scale factor (kg/scale division)
The display value (division) of the measuring instrument
The number of measurement sequences
The number of detected codes
Coverage factor, usually 2 or 3 (ISO Guide to the Expression of Uncertainty: 1995)The mass of the solid (code) in vacuum
The converted mass of the base code
Mass, nominal value of the code (e.g. 1kg)
Standard code density pref, average measured difference between the code to be tested and the standard code
Number of measurements
Subscript of the standard code
Standard deviation
Subscript of the sensitivity code
Subscript of the code to be tested
4 Overview
In code comparison, in order to balance the balance, the subscript of the standard small code added to the lighter weighing pan
Temperature of the standard code
The thermodynamic temperature expansion of the 1990 International Temperature Scale (ITS-90) is not adopted Determination
Standard uncertainty
Volume of solid (code)
Conventional volume of code
Average force calculated by the average mass change of the first group of readings on the mass comparator
Average force calculated by the average mass change of the second group of readings on the mass comparator
Average force used for magnetic susceptibility
Average force used for magnetism
Maximum force used for magnetic susceptibility
Magnetic square of the mass comparator and the brick code in the vertical direction or 7 direction 4.1 The code is a physical measuring tool that reproduces the mass value. It has certain physical and metrological characteristics: shape, size, material, surface condition, density, magnetism, mass nominal value and maximum allowable error, etc. 4.2 For a code, it can reproduce a fixed measured value alone. For a code group, it can not only be used alone, but also different single codes can be combined to reproduce a group of mass values of different sizes.
5 Metrological performance requirements
5.1 Maximum allowable error
5.1.1 Maximum allowable error for initial and subsequent verifications 5.1.1.1 Except for the special cases in Appendix G and the special codes in 1.3.9, the maximum allowable error of the converted mass for initial and subsequent verifications of codes of other accuracy levels shall not be greater than the requirements in Table 1. 5.1.1.2 For codes in use or codes used in conjunction with instruments, if their mass nominal values are not in Table 1, the mass nominal values in Table 1 can be accumulated to obtain the absolute value of their maximum allowable mass error, which is also the sum of the corresponding absolute values of the maximum allowable errors.
5.2 Expanded uncertainty
Within the specified accuracy level, the expanded uncertainty of the converted mass of any single code with a mass nominal value of mo, U(k=2), shall not be greater than one third of the absolute value of the maximum allowable error for the corresponding accuracy level in Table 1. U≤1/3|MPE
5.3 Converted mass
5.3.1 Within the specified accuracy level (E, except for the grade base code), any single code with a mass nominal value of mo: During the first verification, the difference between the converted mass m and the code nominal value mo, the positive value cannot exceed two-thirds of the maximum allowable error absolute value MPE, and the absolute value of the negative value cannot exceed one-third of the maximum allowable error absolute value |MPE|: 2
MPE|≤m≤mo+MPE
5.3.2: Within the specified accuracy level (E, except for the grade code), any single code with a mass nominal value of mo, in the subsequent verification, If the maximum allowable error of a single code is specifically limited, the absolute value of the difference between the reduced mass m (determined according to 5.2 for the extended uncertainty) and the code nominal value mo shall not exceed the absolute value of the maximum allowable error MPE minus the extended uncertainty:
mo-(MPE-U)≤m≤mo+(MPE-U)
5.3.3 For newly produced and repaired increase bowls (including standard increase bowls), in addition to meeting the above relationship, the reduced mass during verification shall also meet the following relationship:
m-mo≥0
5.3.4 For E, grade code, the absolute value of the difference between its reduced mass value and the nominal value m. -mol, shall not exceed the absolute value of the maximum allowable error value
For repaired codes, the control range of its correction value shall be carried out in accordance with 5.3.1. Table 1
Absolute value of the maximum permissible error of the code (IMPE, in mg)
Nominal value
5000kg
2000kg
1000kg
Within the specified accuracy range,
250000
100000
500000
200000
100000
800000
300000
160000
1600000
600000
300000
166000
2500000
1000000
500000
250000
100000
For any single code with a nominal quality value of mo, the difference between the test results of two adjacent cycles shall not exceed one third of the maximum allowable error of the code. 5
6. General technical requirements
6.1 Shape
6.1.1 General
6.1.1.1 For the convenience of production and identification, the code should have a simple geometric shape. The edges and corners of the code should be rounded, and the surface should not have sharp edges or sharp angles and obvious sand holes to prevent wear and dust accumulation. 6.1.1.2 The codes in the code group, except for the codes of 1g or less, should have the same shape. 6.1.1.3 The codes in use are allowed to have other shapes different from those specified in this regulation, provided that their magnetic properties and mass values have been proven to be stable.
6.1.1.4 Codes used in conjunction with measuring instruments or specially designed for special purposes are allowed to have other shapes different from those specified in this regulation.
6.1.2 Codes less than or equal to 1g
6.1.2.1 Codes less than or equal to 1g should be polygonal sheets or wires with appropriate shapes, which are easy to pick up. In a sequence of nominal values, other shapes different from the shape of this sequence should not be inserted. 6.1.2.2 The nominal values indicated by the code shapes are given in Table 2. Nominal values are not marked on the code body. Table 2 Shapes of 1g and codes less than 1g
Nominal values
(5, 50, 500)mg
(2, 20, 200)mg
(1, 10, 100, 1000)mg
6.1.3 Codes from 1g to 50kg
Polygonal sheet
Pentagon
Square, rectangle
Triangle
Pentagon
Square, rectangle
Triangle
6.1.3.1 When the 1g code is placed with its multiple codes or placed alone, it can be in the shape of a multiple of the 1g code; when placed with its component codes, it can be in the shape of a component of the 1g code. 6.1.3.2 For weights of nominal value from 1 g to 50 kg, refer to Figure A.1 of Appendix A. The external dimensions are given in Table A.2. 6.1.3.2.1 The weight may be a right circular cylinder or a truncated cone, see Figure A.1. The height of the weight (excluding the handle) shall be approximately equal to the average diameter and may be between 3/4 and 5/4 of the average diameter. 6.1.3.2.2 If the weight is provided with a handle, its height shall be between the average diameter and the radius of the weight. 6.1.3.35 kg to 50 kg weights may also be of different shapes suitable for grasping, such as shafts, hooks, loops, or other shapes. 6.1.3.45 kg to 5 C kg weights of M, grade, Mz grade, and M, grade may be in the form of an inverted regular hexagonal pyramid or parallelepiped with rounded corners and a solid handle. M, grade, M, grade, M, grade codes can refer to Figure A.3 in Appendix A, and examples of dimensional tolerances can be found in Appendix A, Table A.4. 6.1.3.5 The shape of the code can also be an oblate cylinder (such as an increase code) or a disc as required, and a hole or groove can be opened along the center or radius to facilitate picking and placing.
6.1.4 Codes greater than 50kg
6.1.4.1 Codes greater than 50kg can be cylindrical, rectangular or other suitable shapes. 6.1.4.2 Codes greater than 50kg can adopt different shapes suitable for grasping, such as: shaft, hook, ring, or other shapes. 6.1.4.3 If M, grade, M, grade, M; grade or Mi2 grade, M23 grade code is used on a flat ground (or track), it can be equipped with a limited range of slide rails or grooves. 6.1.5 Shapes of other weights
For weights installed in the instrument and used as a supporting weight in the instrument, or weights equipped according to other specific instrument structures and usage requirements, in order to ensure the measurement purpose and measurement accuracy of the weights, the weights can be made into other corresponding shapes that are compatible with the instrument structure or usage conditions.
6.2 Structure
6.2.1E, grade, E2 grade, F, grade weights6
6.2.1.11mg to 50kg E, grade, Ez grade, F, grade weights1mg to 50kg E, grade, Ez grade, F, grade weights should be solid integral structures, made of a single piece of material, without an adjustment cavity.
6.2.1.2 Weights greater than 50kg
6.2.1.2.1E, grade, Fi grade weights greater than 50kg can have an adjustment cavity. The volume of the adjustment cavity of the E2 grade code shall not exceed 1/1000 of the total volume of the code, and the volume of the F2 grade code shall not exceed 1/20. The adjustment cavity shall be sealed and waterproof and gasproof. The adjustment cavity may be closed by ribbed bolts, knobs or similar parts, which shall be made of the same material as the code and whose surface condition shall comply with the requirements of the E2 grade and F2 grade codes. 6.2.1.2.2 After the first adjustment, the total volume of the adjustment cavity shall be approximately 1/2 empty. 6.2.2 F2 grade code
6.2.2.1 1g to 50kg Fz grade code
6.2.2.1.1 1g to 50kg F2 grade code may have an adjustment cavity, the volume of which shall not exceed 1/4 of the total volume of the code. The adjustment cavity shall be sealed with a knob or other means. 6.2.2.1.2 After the first adjustment, approximately 1/2 of the total volume of the adjustment cavity shall be empty. 6.2.2.2 F2 grade codes greater than 50 kg
F2 grade codes greater than 50 kg may be made of multiple pieces of material. They shall be sealed by waterproof or dustproof welding. Bricks may be made of a variety of materials, and their magnetic properties shall meet the requirements of F2 grade codes. 6.2.2.2.1 F2 grade codes greater than 50 kg may have one adjustment cavity, and the volume of the adjustment cavity shall not exceed 1/20 of the total volume. The adjustment cavity shall be sealed to be waterproof and airtight. Threaded bolts, knobs or similar parts may be used to seal the adjustment cavity. 6.2.2.2.2 After the first adjustment, approximately 1/2 of the total volume of the adjustment cavity shall be empty. 6.2.3Mi grade, M12 grade, M2 grade, M23 grade, Mis grade code 6.2.3.11g to 50kg M grade, Mz grade, M, grade code 6.2.3.1.11g to 50g M, grade, M2 grade, M grade code whether to have an adjustment cavity is not mandatory, 100g to 50kg M, grade, M2 grade, M grade silicon code should have an adjustment cavity. The adjustment cavity should have a reliable cavity cover to prevent foreign matter from entering. It is allowed to open the adjustment cavity to add the adjustment. The volume of the adjustment cavity should not be greater than 1/4 of the total volume of the code. 6.2.3.1.2 After the first adjustment, about 1/3 of the total volume of the adjustment cavity should be empty. 6.2.3.21g to 50kg M, grade, M, grade cylindrical code, the adjustment cavity is coaxial with the vertical axis of the code, the opening is above the code knob, and the entrance diameter is widened. The design of the adjustment cavity shall take into account sealing and easy opening for adjustment.
6.2.3. For parallelepiped weights of 35 kg to 50 kg, the adjustment cavity may be in the tubular handle or, if the handle is solid, it shall be directly above the weight, with the opening in the side or upper surface of the weight (see Appendix A, Figures A.3 and A.5).
6.2.3.3.1 If the adjustment cavity is in the tubular handle (see Figure A.3), the adjustment cavity may be closed by a threaded plug or a disc cover with a central handle. The plug or disc cover may be made of copper alloy or other suitable metal material and shall be closed by a lead plug (or other material) inserted into the internal screw hole or strip tube.
6.2.3.3.2 If the adjustment cavity is cast from above, with the opening in the side or upper surface of the weight (see Figure A.5), the adjustment cavity shall be closed by a disc made of mild steel or other suitable material, sealed by a lead plug or suitable material introduced into the tapered hole. 6.2.3.4 For M, M2, Mz, M23 and M grade yards weighing more than 50 kg, the yards shall not have any cavities that could lead to dust accumulation.
6.2.3.4.1 The yard may have one or more adjustment cavities. The total volume of all adjustment cavities shall not exceed 1/10 of the total volume of the yard. The cavity shall be sealed, waterproof and dustproof. The adjustment cavity may be sealed with a threaded plug or a knob. 6.2.3.4.2 After the first adjustment, at least 1/3 of the volume of the adjustment cavity shall be empty. 6.3 Materials
6.3.1 General2 Table 2 gives the nominal values indicated by the code shape. The nominal values are not marked on the code body. Table 2 Shape of 1g and codes less than 1g
Nominal value
(5, 50, 500)mg
(2, 20, 200)mg
(1, 10, 100, 1000)mg
6.1.3 Codes from 1g to 50kg
Polygonal sheet
Pentagon
Square, rectangle
Triangle
Pentagon
Square, rectangle
Triangle
6.1.3.1 When the 1g code is placed with its multiple code or placed alone, it can be in the shape of a multiple of the 1g code; when placed with its component code, it can be in the shape of a component of the 1g code. 6.1.3.2 For weights of nominal value from 1 g to 50 kg, refer to Figure A.1 of Appendix A. The external dimensions are given in Table A.2. 6.1.3.2.1 The weight may be a right circular cylinder or a truncated cone, see Figure A.1. The height of the weight (excluding the handle) shall be approximately equal to the average diameter and may be between 3/4 and 5/4 of the average diameter. 6.1.3.2.2 If the weight is provided with a handle, its height shall be between the average diameter and the radius of the weight. 6.1.3.35 kg to 50 kg weights may also be of different shapes suitable for grasping, such as shafts, hooks, loops, or other shapes. 6.1.3.45 kg to 5 C kg weights of M, grade, Mz grade, and M, grade may be in the form of an inverted regular hexagonal pyramid or parallelepiped with rounded corners and a solid handle. M, grade, M, grade, M, grade codes can refer to Figure A.3 in Appendix A, and examples of dimensional tolerances can be found in Appendix A, Table A.4. 6.1.3.5 The shape of the code can also be an oblate cylinder (such as an increase code) or a disc as required, and a hole or groove can be opened along the center or radius to facilitate picking and placing.
6.1.4 Codes greater than 50kg
6.1.4.1 Codes greater than 50kg can be cylindrical, rectangular or other suitable shapes. 6.1.4.2 Codes greater than 50kg can adopt different shapes suitable for grasping, such as: shaft, hook, ring, or other shapes. 6.1.4.3 If M, grade, M, grade, M; grade or Mi2 grade, M23 grade code is used on a flat ground (or track), it can be equipped with a limited range of slide rails or grooves. 6.1.5 Shapes of other weights
For weights installed in the instrument and used as a supporting weight in the instrument, or weights equipped according to other specific instrument structures and usage requirements, in order to ensure the measurement purpose and measurement accuracy of the weights, the weights can be made into other corresponding shapes that are compatible with the instrument structure or usage conditions.
6.2 Structure
6.2.1E, grade, E2 grade, F, grade weights6
6.2.1.11mg to 50kg E, grade, Ez grade, F, grade weights1mg to 50kg E, grade, Ez grade, F, grade weights should be solid integral structures, made of a single piece of material, without an adjustment cavity.
6.2.1.2 Weights greater than 50kg
6.2.1.2.1E, grade, Fi grade weights greater than 50kg can have an adjustment cavity. The volume of the adjustment cavity of the E2 grade code shall not exceed 1/1000 of the total volume of the code, and the volume of the F2 grade code shall not exceed 1/20. The adjustment cavity shall be sealed and waterproof and gasproof. The adjustment cavity may be closed by ribbed bolts, knobs or similar parts, which shall be made of the same material as the code and whose surface condition shall comply with the requirements of the E2 grade and F2 grade codes. 6.2.1.2.2 After the first adjustment, the total volume of the adjustment cavity shall be approximately 1/2 empty. 6.2.2 F2 grade code
6.2.2.1 1g to 50kg Fz grade code
6.2.2.1.1 1g to 50kg F2 grade code may have an adjustment cavity, the volume of which shall not exceed 1/4 of the total volume of the code. The adjustment cavity shall be sealed with a knob or other means. 6.2.2.1.2 After the first adjustment, approximately 1/2 of the total volume of the adjustment cavity shall be empty. 6.2.2.2 F2 grade codes greater than 50 kg
F2 grade codes greater than 50 kg may be made of multiple pieces of material. They shall be sealed by waterproof or dustproof welding. Bricks may be made of a variety of materials, and their magnetic properties shall meet the requirements of F2 grade codes. 6.2.2.2.1 F2 grade codes greater than 50 kg may have one adjustment cavity, and the volume of the adjustment cavity shall not exceed 1/20 of the total volume. The adjustment cavity shall be sealed to be waterproof and airtight. Threaded bolts, knobs or similar parts may be used to seal the adjustment cavity. 6.2.2.2.2 After the first adjustment, approximately 1/2 of the total volume of the adjustment cavity shall be empty. 6.2.3Mi grade, M12 grade, M2 grade, M23 grade, Mis grade code 6.2.3.11g to 50kg M grade, Mz grade, M, grade code 6.2.3.1.11g to 50g M, grade, M2 grade, M grade code whether to have an adjustment cavity is not mandatory, 100g to 50kg M, grade, M2 grade, M grade silicon code should have an adjustment cavity. The adjustment cavity should have a reliable cavity cover to prevent foreign matter from entering. It is allowed to open the adjustment cavity to add the adjustment. The volume of the adjustment cavity should not be greater than 1/4 of the total volume of the code. 6.2.3.1.2 After the first adjustment, about 1/3 of the total volume of the adjustment cavity should be empty. 6.2.3.21g to 50kg M, grade, M, grade cylindrical code, the adjustment cavity is coaxial with the vertical axis of the code, the opening is above the code knob, and the entrance diameter is widened. The design of the adjustment cavity shall take into account sealing and easy opening for adjustment.
6.2.3. For parallelepiped weights of 35 kg to 50 kg, the adjustment cavity may be in the tubular handle or, if the handle is solid, it shall be directly above the weight, with the opening in the side or upper surface of the weight (see Appendix A, Figures A.3 and A.5).
6.2.3.3.1 If the adjustment cavity is in the tubular handle (see Figure A.3), the adjustment cavity may be closed by a threaded plug or a disc cover with a central handle. The plug or disc cover may be made of copper alloy or other suitable metal material and shall be closed by a lead plug (or other material) inserted into the internal screw hole or strip tube.
6.2.3.3.2 If the adjustment cavity is cast from above, with the opening in the side or upper surface of the weight (see Figure A.5), the adjustment cavity shall be closed by a disc made of mild steel or other suitable material, sealed by a lead plug or suitable material introduced into the tapered hole. 6.2.3.4 For M, M2, Mz, M23 and M grade yards weighing more than 50 kg, the yards shall not have any cavities that could lead to dust accumulation.
6.2.3.4.1 The yard may have one or more adjustment cavities. The total volume of all adjustment cavities shall not exceed 1/10 of the total volume of the yard. The cavity shall be sealed, waterproof and dustproof. The adjustment cavity may be sealed with a threaded plug or a knob. 6.2.3.4.2 After the first adjustment, at least 1/3 of the volume of the adjustment cavity shall be empty. 6.3 Materials
6.3.1 General2 Table 2 gives the nominal values indicated by the code shape. The nominal values are not marked on the code body. Table 2 Shape of 1g and codes less than 1g
Nominal value
(5, 50, 500)mg
(2, 20, 200)mg
(1, 10, 100, 1000)mg
6.1.3 Codes from 1g to 50kg
Polygonal sheet
Pentagon
Square, rectangle
Triangle
Pentagon
Square, rectangle
Triangle
6.1.3.1 When the 1g code is placed with its multiple code or placed alone, it can be in the shape of a multiple of the 1g code; when placed with its component code, it can be in the shape of a component of the 1g code. 6.1.3.2 For weights of nominal value from 1 g to 50 kg, refer to Figure A.1 of Appendix A. The external dimensions are given in Table A.2. 6.1.3.2.1 The weight may be a right circular cylinder or a truncated cone, see Figure A.1. The height of the weight (excluding the handle) shall be approximately equal to the average diameter and may be between 3/4 and 5/4 of the average diameter. 6.1.3.2.2 If the weight is provided with a handle, its height shall be between the average diameter and the radius of the weight. 6.1.3.35 kg to 50 kg weights may also be of different shapes suitable for grasping, such as shafts, hooks, loops, or other shapes. 6.1.3.45 kg to 5 C kg weights of M, grade, Mz grade, and M, grade may be in the form of an inverted regular hexagonal pyramid or parallelepiped with rounded corners and a solid handle. M, grade, M, grade, M, grade codes can refer to Figure A.3 in Appendix A, and examples of dimensional tolerances can be found in Appendix A, Table A.4. 6.1.3.5 The shape of the code can also be an oblate cylinder (such as an increase code) or a disc as required, and a hole or groove can be opened along the center or radius to facilitate picking and placing.
6.1.4 Codes greater than 50kg
6.1.4.1 Codes greater than 50kg can be cylindrical, rectangular or other suitable shapes. 6.1.4.2 Codes greater than 50kg can adopt different shapes suitable for grasping, such as: shaft, hook, ring, or other shapes. 6.1.4.3 If M, grade, M, grade, M; grade or Mi2 grade, M23 grade code is used on a flat ground (or track), it can be equipped with a limited range of slide rails or grooves. 6.1.5 Shapes of other weights
For weights installed in the instrument and used as a supporting weight in the instrument, or weights equipped according to other specific instrument structures and usage requirements, in order to ensure the measurement purpose and measurement accuracy of the weights, the weights can be made into other corresponding shapes that are compatible with the instrument structure or usage conditions.
6.2 Structure
6.2.1E, grade, E2 grade, F, grade weights6
6.2.1.11mg to 50kg E, grade, Ez grade, F, grade weights1mg to 50kg E, grade, Ez grade, F, grade weights should be solid integral structures, made of a single piece of material, without an adjustment cavity.
6.2.1.2 Weights greater than 50kg
6.2.1.2.1E, grade, Fi grade weights greater than 50kg can have an adjustment cavity. The volume of the adjustment cavity of the E2 grade code shall not exceed 1/1000 of the total volume of the code, and the volume of the F2 grade code shall not exceed 1/20. The adjustment cavity shall be sealed and waterproof and gasproof. The adjustment cavity may be closed by ribbed bolts, knobs or similar parts, which shall be made of the same material as the code and whose surface condition shall comply with the requirements of the E2 grade and F2 grade codes. 6.2.1.2.2 After the first adjustment, the total volume of the adjustment cavity shall be approximately 1/2 empty. 6.2.2 F2 grade code
6.2.2.1 1g to 50kg Fz grade code
6.2.2.1.1 1g to 50kg F2 grade code may have an adjustment cavity, the volume of which shall not exceed 1/4 of the total volume of the code. The adjustment cavity shall be sealed with a knob or other means. 6.2.2.1.2 After the first adjustment, approximately 1/2 of the total volume of the adjustment cavity shall be empty. 6.2.2.2 F2 grade codes greater than 50 kg
F2 grade codes greater than 50 kg may be made of multiple pieces of material. They shall be sealed by waterproof or dustproof welding. Bricks may be made of a variety of materials, and their magnetic properties shall meet the requirements of F2 grade codes. 6.2.2.2.1 F2 grade codes greater than 50 kg may have one adjustment cavity, and the volume of the adjustment cavity shall not exceed 1/20 of the total volume. The adjustment cavity shall be sealed to be waterproof and airtight. Threaded bolts, knobs or similar parts may be used to seal the adjustment cavity. 6.2.2.2.2 After the first adjustment, approximately 1/2 of the total volume of the adjustment cavity shall be empty. 6.2.3Mi grade, M12 grade, M2 grade, M23 grade, Mis grade code 6.2.3.11g to 50kg M grade, Mz grade, M, grade code 6.2.3.1.11g to 50g M, grade, M2 grade, M grade code whether to have an adjustment cavity is not mandatory, 100g to 50kg M, grade, M2 grade, M grade silicon code should have an adjustment cavity. The adjustment cavity should have a reliable cavity cover to prevent foreign matter from entering. It is allowed to open the adjustment cavity to add the adjustment. The volume of the adjustment cavity should not be greater than 1/4 of the total volume of the code. 6.2.3.1.2 After the first adjustment, about 1/3 of the total volume of the adjustment cavity should be empty. 6.2.3.21g to 50kg M, grade, M, grade cylindrical code, the adjustment cavity is coaxial with the vertical axis of the code, the opening is above the code knob, and the entrance diameter is widened. The design of the adjustment cavity shall take into account sealing and easy opening for adjustment.
6.2.3. For parallelepiped weights of 35 kg to 50 kg, the adjustment cavity may be in the tubular handle or, if the handle is solid, it shall be directly above the weight, with the opening in the side or upper surface of the weight (see Appendix A, Figures A.3 and A.5).
6.2.3.3.1 If the adjustment cavity is in the tubular handle (see Figure A.3), the adjustment cavity may be closed by a threaded plug or a disc cover with a central handle. The plug or disc cover may be made of copper alloy or other suitable metal material and shall be closed by a lead plug (or other material) inserted into the internal screw hole or strip tube.
6.2.3.3.2 If the adjustment cavity is cast from above, with the opening in the side or upper surface of the weight (see Figure A.5), the adjustment cavity shall be closed by a disc made of mild steel or other suitable material, sealed by a lead plug or suitable material introduced into the tapered hole. 6.2.3.4 For M, M2, Mz, M23 and M grade yards weighing more than 50 kg, the yards shall not have any cavities that could lead to dust accumulation.
6.2.3.4.1 The yard may have one or more adjustment cavities. The total volume of all adjustment cavities shall not exceed 1/10 of the total volume of the yard. The cavity shall be sealed, waterproof and dustproof. The adjustment cavity may be sealed with a threaded plug or a knob. 6.2.3.4.2 After the first adjustment, at least 1/3 of the volume of the adjustment cavity shall be empty. 6.3 Materials
6.3.1 GeneralGrade, M; Grade or Mi2 grade, M23 grade codes are used on flat ground (or tracks) and can be equipped with limited range slide rails or grooves. 6.1.5 Shapes of other codes
Codes installed in instruments and used as supporting instruments, or codes equipped according to other specific instrument structures and usage requirements, in order to ensure the measurement purpose and measurement accuracy of the code, the code can be made into other corresponding shapes that are compatible with the instrument structure or usage conditions.
6.2 Structure
6.2.1E, grade, E2 grade, F, grade code 6
6.2.1.11mg to 50kg E, grade, Ez grade, F, grade code 1mg to 50kg E, grade, Ez grade, F, grade code should be a solid integral structure, composed of a whole piece of material, without an adjustment cavity.
6.2.1.2 Weights over 50 kg
6.2.1.2.1 Weights over 50 kg may have an adjustment cavity. The volume of the adjustment cavity for weights over 50 kg may not exceed 1/1000 of the total weight volume for weights over 50 kg and 1/20 for weights over 50 kg. The adjustment cavity shall be sealed and water and gas proof. Threaded bolts, knobs or similar parts may be used to close the adjustment cavity. The material of the adjustment cavity shall be the same as that of the weight and the surface condition shall conform to the requirements for weights over 50 kg over 50 kg. 6.2.1.2.2 After the first adjustment, the total volume of the adjustment cavity shall be approximately 1/2 empty. 6.2.2F2 weights
6.2.2.11 g to 50 kg Fz weights
6.2.2.1.11 g to 50 kg F2 weights may have an adjustment cavity whose volume shall not exceed 1/4 of the total weight volume. The adjustment cavity shall be sealed with a knob or other means. 6.2.2.1.2 After the first adjustment, approximately 1/2 of the total volume of the adjustment cavity shall be empty. 6.2.2.2 F2 grade codes greater than 50 kg
F2 grade codes greater than 50 kg may be made of multiple pieces of material. They shall be sealed by waterproof or dustproof welding. Bricks may be made of a variety of materials, and their magnetic properties shall meet the requirements of F2 grade codes. 6.2.2.2.1 F2 grade codes greater than 50 kg may have one adjustment cavity, and the volume of the adjustment cavity shall not exceed 1/20 of the total volume. The adjustment cavity shall be sealed to be waterproof and airtight. Threaded bolts, knobs or similar parts may be used to seal the adjustment cavity. 6.2.2.2.2 After the first adjustment, approximately 1/2 of the total volume of the adjustment cavity shall be empty. 6.2.3Mi grade, M12 grade, M2 grade, M23 grade, Mis grade code 6.2.3.11g to 50kg M grade, Mz grade, M, grade code 6.2.3.1.11g to 50g M, grade, M2 grade, M grade code whether to have an adjustment cavity is not mandatory, 100g to 50kg M, grade, M2 grade, M grade silicon code should have an adjustment cavity. The adjustment cavity should have a reliable cavity cover to prevent foreign matter from entering. It is allowed to open the adjustment cavity to add the adjustment. The volume of the adjustment cavity should not be greater than 1/4 of the total volume of the code. 6.2.3.1.2 After the first adjustment, about 1/3 of the total volume of the adjustment cavity should be empty. 6.2.3.21g to 50kg M, grade, M, grade cylindrical code, the adjustment cavity is coaxial with the vertical axis of the code, the opening is above the code knob, and the entrance diameter is widened. The design of the adjustment cavity shall take into account sealing and easy opening for adjustment.
6.2.3. For parallelepiped weights of 35 kg to 50 kg, the adjustment cavity may be in the tubular handle or, if the handle is solid, it shall be directly above the weight, with the opening in the side or upper surface of the weight (see Appendix A, Figures A.3 and A.5).
6.2.3.3.1 If the adjustment cavity is in the tubular handle (see Figure A.3), the adjustment cavity may be closed by a threaded plug or a disc cover with a central handle. The plug or disc cover may be made of copper alloy or other suitable metal material and shall be closed by a lead plug (or other material) inserted into the internal screw hole or strip tube.
6.2.3.3.2 If the adjustment cavity is cast from above, with the opening in the side or upper surface of the weight (see Figure A.5), the adjustment cavity shall be closed by a disc made of mild steel or other suitable material, sealed by a lead plug or suitable material introduced into the tapered hole. 6.2.3.4 For M, M2, Mz, M23 and M grade yards weighing more than 50 kg, the yards shall not have any cavities that could lead to dust accumulation.
6.2.3.4.1 The yard may have one or more adjustment cavities. The total volume of all adjustment cavities shall not exceed 1/10 of the total volume of the yard. The cavity shall be sealed, waterproof and dustproof. The adjustment cavity may be sealed with a threaded plug or a knob. 6.2.3.4.2 After the first adjustment, at least 1/3 of the volume of the adjustment cavity shall be empty. 6.3 Materials
6.3.1 GeneralGrade, M; Grade or Mi2 grade, M23 grade codes are used on flat ground (or tracks) and can be equipped with limited range slide rails or grooves. 6.1.5 Shapes of other codes
Codes installed in instruments and used as supporting instruments, or codes equipped according to other specific instrument structures and usage requirements, in order to ensure the measurement purpose and measurement accuracy of the code, the code can be made into other corresponding shapes that are compatible with the instrument structure or usage conditions.
6.2 Structure
6.2.1E, grade, E2 grade, F, grade code 6
6.2.1.11mg to 50kg E, grade, Ez grade, F, grade code 1mg to 50kg E, grade, Ez grade, F, grade code should be a solid integral structure, composed of a whole piece of material, without an adjustment cavity.
6.2.1.2 Weights over 50 kg
6.2.1.2.1 Weights over 50 kg may have an adjustment cavity. The volume of the adjustment cavity for weights over 50 kg may not exceed 1/1000 of the total weight volume for weights over 50 kg and 1/20 for weights over 50 kg. The adjustment cavity shall be sealed and water and gas proof. Threaded bolts, knobs or similar parts may be used to close the adjustment cavity. The material of the adjustment cavity shall be the same as that of the weight and the surface condition shall conform to the requirements for weights over 50 kg over 50 kg. 6.2.1.2.2 After the first adjustment, the total volume of the adjustment cavity shall be approximately 1/2 empty. 6.2.2F2 weights
6.2.2.11 g to 50 kg Fz weights
6.2.2.1.11 g to 50 kg F2 weights may have an adjustment cavity whose volume shall not exceed 1/4 of the total weight volume. The adjustment cavity shall be sealed with a knob or other means. 6.2.2.1.2 After the first adjustment, approximately 1/2 of the total volume of the adjustment cavity shall be empty. 6.2.2.2 F2 grade codes greater than 50 kg
F2 grade codes greater than 50 kg may be made of multiple pieces of material. They shall be sealed by waterproof or dustproof welding. Bricks may be made of a variety of materials, and their magnetic properties shall meet the requirements of F2 grade codes. 6.2.2.2.1 F2 grade codes greater than 50 kg may have one adjustment cavity, and the volume of the adjustment cavity shall not exceed 1/20 of the total volume. The adjustment cavity shall be sealed to be waterproof and airtight. Threaded bolts, knobs or similar parts may be used to seal the adjustment cavity. 6.2.2.2.2 After the first adjustment, approximately 1/2 of the total volume of the adjustment cavity shall be empty. 6.2.3Mi grade, M12 grade, M2 grade, M23 grade, Mis grade code 6.2.3.11g to 50kg M grade, Mz grade, M, grade code 6.2.3.1.11g to 50g M, grade, M2 grade, M grade code whether to have an adjustment cavity is not mandatory, 100g to 50kg M, grade, M2 grade, M grade silicon code should have an adjustment cavity. The adjustment cavity should have a reliable cavity cover to prevent foreign matter from entering. It is allowed to open the adjustment cavity to add the adjustment. The volume of the adjustment cavity should not be greater than 1/4 of the total volume of the code. 6.2.3.1.2 After the first adjustment, about 1/3 of the total volume of the adjustment cavity should be empty. 6.2.3.21g to 50kg M, grade, M, grade cylindrical code, the adjustment cavity is coaxial with the vertical axis of the code, the opening is above the code knob, and the entrance diameter is widened. The design of the adjustment cavity shall take into account sealing and easy opening for adjustment.
6.2.3. For parallelepiped weights of 35 kg to 50 kg, the adjustment cavity may be in the tubular handle or, if the handle is solid, it shall be directly above the weight, with the opening in the side or upper surface of the weight (see Appendix A, Figures A.3 and A.5).
6.2.3.3.1 If the adjustment cavity is in the tubular handle (see Figure A.3), the adjustment cavity may be closed by a threaded plug or a disc cover with a central handle. The plug or disc cover may be made of copper alloy or other suitable metal material and shall be closed by a lead plug (or other material) inserted into the internal screw hole or strip tube.
6.2.3.3.2 If the adjustment cavity is cast from above, with the opening in the side or upper surface of the weight (see Figure A.5), the adjustment cavity shall be closed by a disc made of mild steel or other suitable material, sealed by a lead plug or suitable material introduced into the tapered hole. 6.2.3.4 For M, M2, Mz, M23 and M grade yards weighing more than 50 kg, the yards shall not have any cavities that could lead to dust accumulation.
6.2.3.4.1 The yard may have one or more adjustment cavities. The total volume of all adjustment cavities shall not exceed 1/10 of the total volume of the yard. The cavity shall be sealed, waterproof and dustproof. The adjustment cavity may be sealed with a threaded plug or a knob. 6.2.3.4.2 After the first adjustment, at least 1/3 of the volume of the adjustment cavity shall be empty. 6.3 Materials
6.3.1 General4 For M, M2, Mz, M23 and M grade yards weighing more than 50 kg, the yards shall not have any cavities that may cause dust accumulation.
6.2.3.4.1 The yard may have one or more adjustment cavities. The total volume of all adjustment cavities shall not exceed 1/10 of the total volume of the yard. The cavity shall be sealed, waterproof and dustproof. The adjustment cavity may be sealed with a threaded plug or a lifting button. 6.2.3.4.2 After the first adjustment, at least 1/3 of the volume of the adjustment cavity shall be empty. 6.3 Materials
6.3.1 General4 For M, M2, Mz, M23 and M grade yards weighing more than 50 kg, the yards shall not have any cavities that may cause dust accumulation.
6.2.3.4.1 The yard may have one or more adjustment cavities. The total volume of all adjustment cavities shall not exceed 1/10 of the total volume of the yard. The cavity shall be sealed, waterproof and dustproof. The adjustment cavity may be sealed with a threaded plug or a lifting button. 6.2.3.4.2 After the first adjustment, at least 1/3 of the volume of the adjustment cavity shall be empty. 6.3 Materials
6.3.1 General
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