Some standard content:
National Metrology Verification System of the People's Republic of China JJG2045-90
Force (1MN) Measuring Instruments
Approved on October 13, 189
Approved on September 15, 1990
State Administration of Inspection and Quarantine
Verification System of Force (≤1MN) Measuring Instruments
rrkemke
Verifisation Schemc of Mcasrins Instrumcnts for Force(1MN)
JJG2045-90
This national metrology verification system was approved by the State Technical Supervision Commission on October 13, 1989, and came into effect on August 15, 1990
Drafting unit: China Institute of Metrology The technical provisions of this verification system shall be interpreted by the drafting unit. The main drafters of this verification system:
Zheng Qinghui (China Institute of Mechanics and Technology) Li Jingguo Institute of Metrology》
Gan Jian (China Institute of Measurement and Testing)
Measuring standard instruments
Work compensation mother
Force consumption (1MV) Measuring instrument verification system block diagram West
33G204590
Total 4 pages Page 1
Force (≤TMN) Measuring instrument verification system This calibration system is applicable to the calibration of force (1MN) measuring instruments, it stipulates the national benchmark of the unit Newton (V) of force, the basic measuring instruments included in the benchmark, the measuring concepts of the benchmark and the estimation procedures of the measuring instruments, and indicates their uncertainty and basic determination methods, etc. In the whole force calibration system, the force standard can be divided into two parts. The first part is the fixed standard instrument with large capacity. This type of standard instrument is divided into weight type, lever cup type, pressure type and superposition type according to its structure. The second type is a convenient standard instrument that transmits force values. This type of standard instrument is divided into dial indicator, mercury type, optical type, laser type, variable type, piezomagnetic type, electromechanical type, capacitance type, vibrating string or other auxiliary force instruments according to its measuring principle. A national force standard consists of 6 static vertical standard machines. The force values of 6 static thrust machines are 20N1, 210N, 100~6kN15k, 10~1N, 10N-100N. The static weight standard machine uses the force generated by the code as the reference force, and automatically reports the force value in a certain order through appropriate mechanisms and adds it to the measured force for calibration. The uncertainty of the force value of this machine mainly depends on the uncertainty of the carbon code mass disk, the measurement uncertainty of the force acceleration at the installation point, the measurement uncertainty of the carbon code air velocity, and is also related to the stability of the silicon shadow, the addition method and the structure of the machine. The total uncertainty of the force value of the national base 10N~IMN force value is ×101 (the total value is 3, the same below). 2. Measuring standard sliding instruments
3. Force standard machines include four types: lever type, hydraulic type, static vertical type and addition type. The lever output standard machine uses the electricity generated by the string as the standard negative quotient, and automatically adds the force value to the calibrated instrument according to the predetermined sequence through the return lever mechanism. It is easier to get a larger value than the static force standard machine. The total mechanical performance is mainly determined by the speed of the machine rod and the total situation, the structure of the knife bearing and the quality of the wind engineering installation. At present, this kind of machine in China is a single lever, and its lever ratio is 10:1 and 2:1. Therefore, the maximum force position is [MN, 30, 10060 including less than 50), and the total value Not 3×10-, up to 1%10*, considering the calibration conditions and pressure, the total uncertainty of the force value of the lever-type force standard machine is determined to be 5×10 and 3×10. In actual calibration, the level to which it belongs is determined according to the calibration results. For the hydraulic force standard machine, considering the current processing and installation level of this type of instrument, the minimum total uncertainty of the force value is generally determined to be 1×10 and 5×10-*. The flexible force standard uses a force meter (group) with a higher force than the one being calibrated as the standard, and connects it with the machine being tested. The force value of this force standard is always uncertain. It mainly depends on the accuracy index of the standard dynamometer, including the performance of the standard dynamometer, the total uncertainty of the force value is 5×10*, and the total uncertainty of the force value is 1×0-10. For other types of output force compensation devices that may be built, as long as the total uncertainty of the test is not greater than 1×0-10, it can also be used as a standard.
There are two important technical indicators for the standard dynamometer to transmit force value, one is repeatability R, and the other is the rate. According to the accuracy of the standard transmission, the standard dynamometer is divided into two levels, namely, level 1 and level 0.3, which can be used as the transmission and comparison between the standards. According to the previous requirement, R and S should not be greater than one tenth of the uncertainty of the force value of the replaced standard machine. The upper standard measurement uses two levels of 0.03 and G.05 for the calibration of the secondary standard machine, and the level 0,01 force standard cylinder is used for adjustment. In order to meet the selection requirements, it is currently necessary to use sensors of corresponding levels and corresponding test instruments. The calibration conditions and the time between the parts should be kept as close as possible. The standard measuring instruments are divided into two types for the transmission between the standard force value and the working machine, namely, level 0.1, level 0,3, and level 0,5. The standard dynamometer is used to test the machine with force uncertainty better than 0.5%, the 03 standard dynamometer is used to test the machine with force uncertainty better than 1%, the 0.5 standard dynamometer is used to test the machine with force uncertainty less than 2%, and the tensile test and spring test machine with smaller maximum force value can also be used to test the machine with force uncertainty less than 1×10-*.
JJG2G45—90
Total 4 Page 3
According to the theory of force transmission, when the force verification system block diagram and the requirements of the above-mentioned tax specification agent are met, the transmission between each level of force value can ignore the influence of the force uncertainty or other indicators of the first level on the next level.
4 In the calibration system diagram, the method for determining the uncertainty of the force value of the static gravity force standard machine is as follows: The static gravity force standard machine, together with the single, also needs to be compared with a high-precision estimator and a force calibration machine.
5 For the quick test rod for calibrating small forces, its calibration is completed by directly measuring its lever ratio and weighing the magnetic code. The instrument should be of good quality. The total indication accuracy can easily reach 1×10-1.
Three working measuring instruments
6 Generally, material testing machines refer to instruments used for mechanical property tests such as metal materials. They are divided into two levels according to their technical indicators. Most of the machines with a total force uncertainty of no more than 1% are traditional filter-type or machine-type testing materials and rubber testing machines. They are calibrated with a 0.3-level standard measuring instrument. The total force uncertainty cannot exceed 0.5%. The robot part is an electronic material testing machine that uses a force sensor to measure force. It is calibrated with a 0.1-level standard measuring instrument. The 0.7-level standard dynamometer is used for the mechanical performance test of small specimens and non-metallic materials. The 0.3-level standard dynamometer is used for the mechanical performance test of small specimens and non-metallic materials. ... This test machine is mainly an electronic test machine. There are always some problems. 1. Use a standard difficult to test instrument for calibration:
1E Other test instruments have different precisions and are not the same as the original ones. There are 4 parts in total, the 4th part is
rrkeskei
JJG 2045—90
Force and weighing sensors, except for the 0, MN and U3 grade dynamometers which are calibrated with force base (standard), most of the others are calibrated with corresponding force standard machines according to the requirements and possibilities.
12Working dynamometers are mainly used for measuring the traction of automobiles and connecting machines. Most of them are used in harsh environments with relatively strong conditions. The requirements for the directness and stability of their force values are not high. The short is 3%. The belt can be checked with any suitable force standard machine. Four force value (or IMN) measuring instruments are used to determine the system of force [<1MN> metering instruments. The calibration diagram of the national force gauge is shown in Figure 10N-MN
World Hui force gauge
JDN-:MN
1 x 2-+TS 3 x10
This is ±k subx
Certification of formal force standard machinebzxZ.net
k-IMN
Jiang open force guide standard machine
8S3x5x
Accurate measuring instrument
According to the level of measurement and calculation
One-step standard machine
FO k~L MN
1×10F
Weight force standard chaos
FJ NI MN
1×164
Comparison test rod
P0-25N
1031010
±+
Other force measuring instruments
10 N-1MN
Special selection machine
For 22×16-4
Line number:
Force business:
Office or straight
A510-x1
One-stage working force
Small force testing machine
21x10 -
One force value single uncertain amount of Dong number is
Force heat determination certificate
1×10-4
High-quality test machine
F10N~IMN
45 1×10 1
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.