Some standard content:
Verification Regulations of the People's Republic of China JJG 46--204
Torsion Balance
2004-03-02 Issued
2004-09-02 Implementation
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China http://foodmate.net JJG 46-2004
Verification Regulatian
of Torsion Balance
JJG 46-2004
Daiyu JJG 46- 1976
This regulation has been approved by the General Administration of Quality Supervision, Inspection and Quarantine on October 2, 2004, and will be implemented on September 2, 2004.
Responsible unit:
Main drafting unit:
Participating drafting unit:
National Quality and Density Meter Technical Committee
Shandong Research Institute of Planning and Science
Shanghai Precision Scientific Instrument Co., Ltd. Daping Instrument Factory Shaanxi Institute of Metrology
This regulation is entrusted to the National Quality and Density Metrology Technical Committee for interpretationhttp://foodmate.netMain drafter of this regulation:
Liu Jianming
Additional drafter:
JJG 46—204
(China Institute of Metrology)
(Shanghai Precision Scientific Instrument Co., Ltd. Balance Instrument Factory)
http://foodmate.netIntroduction
2 Delivery
3 Measurement performance requirements
3.1 Basic parameters
3.2 Maximum allowable warranty
3.3 Accurate measurement, etc. Level (optional)
4 General technical requirements
4.1 External and structural requirements
4.2 Operating environment conditions
5 Specifications
Verification conditions
Verification frequency
5.3 Verification method
5.4 Processing of verification results
5.5 Verification cycle
Appendix A Verification record format
JJG 46—2004
Appendix Torque Balance Verification Procedure
Record in the form! Torque Balance Verification Result Notice
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IG 46—2004
Torsion Balance Verification Procedure
This procedure is in accordance with the International Recommendation R76 (non-automatic weighing instruments) of the National Standard Organization for Legal Metrology (NGO) in terms of accuracy level, technical terms, etc.
1 Scope
This procedure is applicable to the initial verification, subsequent verification and in-use inspection of torque balances (hereinafter referred to as balances). 2 General
The main structure of the torque balance is a combination of a single-arm lever and two elastic elements, a flat coil and a plate. It does not require a base code. It only needs to turn the reading knob and measure the balance torque generated by the deflection angle of the elastic element. Because the balance adopts the above-mentioned bearing structure, there is no unequal error and mechanical fulcrum. At one end of the horizontal depth, a quick stop damper is installed to stop the beam within a few seconds, so as to facilitate the rapid reading of the measured value. This balance is used for weighing and density analysis of micro materials and has been widely used in electronics, textiles, metallurgy, chemical industry, agriculture, health departments, scientific research institutions and colleges and universities. Metrological performance requirements
Basic wear (see Table 1)
Table! Basic efficiency of the balance
Maximum quantity
Verification division value.
Method: Verification division value equal to actual division value 1.2 Maximum allowable error (see Table 2)
Maximum range
Table 2 Maximum allowable error requirements for balances
Micro-tolerance error
Verification division value:
0.01 ng - 0.u2mg
0.05mg-Sung
empty I show platinum to bean
unread pad
position: mg
calibration division value
same load indication value
reproducibility/rng
Note: Sensitivity refers to the reading pointer moving--hour, the pointer and the verification mark line of the disk, http://www.foodmate.net
sensitive touch/mm
3.3 Report accuracy level CT> level
calibration division number: r =Max/=S[K
4 General technical requirements
4.1 External regulations and structural requirements
JJG462004
4.1! The scale plate should have the model specification, product weight, factory number, manufacturer's name, maximum scale base, calibration value, date, accuracy level, manufacturing and measurement license number, etc. 1.12. The appearance of the balance should not have obvious defects, and the color should be uniform, without obvious defects, peeling, burrs, and marks. 4.1.3 The gap between the pointer and the dial should be less than 1.2mm, the tip should be perpendicular to the dial, and can overlap with the shortest scale 1/2-3/4, and the color of the needle tip and the scale should be clearly different. 4.1.4: The brake mechanism should move smoothly. When the balance is turned on, it is not allowed to be affected by the movement, finger jamming, needle slipping, needle skipping, etc. After the large balance is braked, the large balance should be placed on the plate or hung on the medicine, and the static position of the balance should be kept small.
41.5 The two sides of the flat roll are flat. After being tested, the forming surface must also be straight, and the fixed parts of the ends must not be loose.
4.1. The two sides of the G sheet are flat. After the two sheets are assembled and fixed, they form a 9-inch shape with each other. There must be no bending or lateral twisting.
4.1.7 The inner diameter of the dial shall not be less than 0.8mm, and the width of the scale line shall not exceed about 1/5 of the scale. At least two auxiliary lines shall be engraved on both sides of the start and end scale lines. A number with similar scales shall be marked at every 10, 20 or 50 scales. The glass covering the dial shall be transparent and clean, and shall not have defects that hinder reading. 4.1.8 For a scale with a fixed position, check that the swing time of the pointer from the beginning to the end shall not be more than ten degrees. 4.1.9 The accuracy of the level is 12°
4..10 The balance is tilted 45 degrees in four directions: front, back, and center. It is used to point to the outside and inside at the same time. After this work is completed, the balance should be able to work normally. 4.2 Working environment conditions
4.21 The temperature and humidity of the working environment shall meet the requirements of Table 3. There should be no dynamic airflow that may affect the performance of the product:
Table 3 Working environment conditions
Record mass/g
25 - 50
[00-7500
Temperature range! ℃
20 ± 5
20 ±?
No test gas exists in the surrounding air.
4.2.3 The semi-solid platform should be used at: 2
Humidity (%H)
http://foodmate.net5 Instrument control
JJG 16—2004
The instrument control includes the first calibration, subsequent calibration and other tests. The calibration plan and the first calibration are carried out
5.1 Calibration conditions
5.1.1 Calibration of two standard instruments
According to the coordination of the temperature and humidity of the equipment. Table 4 Grade of silicon used in calibrating balance
Yunping calibration value em
The accuracy grade of the sample shall not be lower than
5.1.2 The calibration environment conditions shall meet the requirements of Table 3 for the working environment conditions. 5.1.3 Before calibration, use a clean mesh or brush to carefully clean the dust on the surface of the balance. 5.1.4 Before calibration, store the whole for at least 12 hours.
The main components such as the flat roll that has been moved during the whole process, such as the opening and closing, must be parked for 24 hours before calibration 5.2
Calibration items
Meter risk determination item
Date of calibration
External light and connection control inspection
No-load small value recovery
Six-value error
On-site load indication signal weight
: +" is the time to be checked, "_" is the small Item. 5.3 Methods 53.1 Appearance inspection method First inspection After inspection (decision) The inspection method shall be carried out according to the inspection method and the first inspection method shall be carried out according to 4.1.1 and 4.1.10. The subsequent inspection shall be carried out according to 4.1.1, 4.2, 4.3.4.1.4. The degree of compliance shall be paid. 5.3.1. Determination of no-load indication
First, check the position of the balance to align the digital pointer with the zero line, and then adjust the position to make the check pointer coincide with the check mark line.
When the balance is turned on, the check pointer should be aligned with the zero line. If it is no longer aligned, then read the display when the effective pointer is aligned with the zero line.
http://foodmate.net/|tt||JJG 462004
After completing the verification of the above-mentioned 5.3.3 and 5.3.4, the balance shall be verified again:
The repeatability of the empty intercept indication of the balance shall be calculated by subtracting the minimum value of the deviation from the maximum value. The value shall meet the requirements of Table 2.
5.3.3 Check of indication error
Turn on the balance. If the check pointer and the check mark do not overlap, readjust them to make them coincide. Then increase the load in the order corresponding to the scales marked with numbers on the dial. When the load is increased to the maximum value, unload it according to the points when adding it, and check the indication error of the balance. Each balance shall at least check 5 points evenly distributed on the scale. The indication error of the balance shall be calculated as the difference between the indication of the balance and the actual value of the weight added on the scale pan. The error E with the largest absolute value shall be taken as the indication error of the balance. The indication error of the balance shall comply with the provisions of Table 2. 5.3.4: Verification of the indication weight of the balance when loading and unloading The verification of the indication weight of the balance when loading and unloading is carried out at the same time as the determination of the indication error of the balance. The annual loading and unloading indication reproducibility is to connect the same scale point, calculate the difference between the indications when loaded and unloaded, and take the most appropriate value. As the loading and unloading indication reproducibility of the balance. The loading and unloading indication reproducibility of the balance should meet the requirements of Table 2. 5.3.5 Verification of sensitivity
While verifying the indication difference, verify the sensitivity of the balance at the balance point and the most important scale base point. After turning on the balance, first confirm that the check pointer coincides with the check mark line, and then move the reading pointer to any one of the scales at its position. The distance S between the check pointer and the check mark is the sensitivity of the balance, which should meet the requirements of Table 2. 5.3.6 The metering performance of the balance is generally calibrated once. When there is no doubt about the calibration validity, the items in doubt can be re-checked. However, when there is doubt about the accuracy of the indication, the whole process must be re-checked. S.4 Reasons for the inspection results
According to the regulations, the balance that passes the inspection will be issued a calibration certificate (see Appendix B for the format), and those that fail the inspection will be issued a calibration result notification (see Appendix for the format). 5.5 Calibration cycle
The calibration cycle of half a day is determined according to the specific usage situation and generally does not exceed 1 year. 4
http://foodmate.netAppendix 4
Weighing scale
Determination of graduations
Set up
Being controlled
Calibration station
Determination of quality
According to the actual
Quality value
JFG 46—2004
Torque balance recording format
Used units
Manufacturer
Indication of large scale
Indication weight
Joint venture and introduction
Indication error
F, = t, - m
Dial test
httn:
Additional inspection
Large indication error
Minimum value Emg
Cut-off load indication severity
Ai,tmg
Test period
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Appendix B
Grade F
Free test Ninurm:
Empty micro indication reproducibility 7/
Indication error E/mg:
Sweep the load and change the indication single friend
Definition summary:
Test environment conditions:|| tt||Temperature:
1IC46—2004
Format of the inner page of the verification certificate of torque balance
Balance verification result
Accuracy:
Maximum allowable error
Verification range
0.01mg~0.02mg
Verification range
0.0mg-smg
http://foodmate.netAppendix C
Verification item
Sensitivity s/mm:
Empty indication value electric 1mg
Indication error/ng:
JJG 46—2084
Torsion balance calibration result notification inner page format Maximum allowable error
Daping calibration result
Additional cutting and removal indication reproducibility m
Callision conclusion:
Callision environment conditions:
Temperature:
Humidity:
Callision graduation value
0.01mg~0.02mg
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Callision graduation value
0.05mng - 5ngAppendix B
Gradient F
Free of charge Ninurm:
Reproducibility of micro-indication value7/
Error of indication value E/mg:
Sweep and change indication value single friend life
Definition summary:
Test environment conditions:
Temperature:
1IC46—2004
Format of inner page of calibration certificate for torque balance
Balance calibration result|| tt||Degree:
Maximum allowable error
Test range
0.01mg~0.02mg
Test range
0.0mg-smg
http://foodmate.netAppendix C
Test items
Sensitivity s/mm:
Empty indication value electric complex 1mg
Indication error/ng:
JJG 46—2084
Torsion balance calibration result notification inner page format Maximum allowable error
Daping calibration result
Additional cutting and removal indication reproducibility m
Callision conclusion:
Callision environment conditions:
Temperature:
Humidity:
Callision graduation value
0.01mg~0.02mg
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Callision graduation value
0.05mng - 5ngAppendix B
Gradient Fwww.bzxz.net
Free of charge Ninurm:
Reproducibility of micro-indication value7/
Error of indication value E/mg:
Sweep and change indication value single friend life
Definition summary:
Test environment conditions:
Temperature:
1IC46—2004
Format of inner page of calibration certificate for torque balance
Balance calibration result|| tt||Degree:
Maximum allowable error
Test range
0.01mg~0.02mg
Test range
0.0mg-smg
http://foodmate.netAppendix C
Test items
Sensitivity s/mm:
Empty indication value electric complex 1mg
Indication error/ng:
JJG 46—2084
Torsion balance calibration result notification inner page format Maximum allowable error
Daping calibration result
Additional cutting and removal indication reproducibility m
Callision conclusion:
Callision environment conditions:
Temperature:
Humidity:
Callision graduation value
0.01mg~0.02mg
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L/foodmate.net
Callision graduation value
0.05mng - 5ng
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