Some standard content:
National Metrology Verification Regulation of the People's Republic of China JJG264—2008
Test Instruments
Measuring Instruments for Cereals Density2008-05-23Promulgated
Implementation on 2008-11-23
Promulgated by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China JJG264—2008
Verification Regulation of MeasuringInstruments for Cereals DensityJJG 264---2008
Replaces JJG 264-1981
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on May 23, 2008, and came into effect on November 23, 2008.
Responsible unit: National Technical Committee for Flow and Capacity Measurement Drafting unit: China National Institute of Metrology This regulation entrusts the National Technical Committee for Flow and Capacity Measurement to be responsible for interpreting this regulation. Main drafters:
JJG264-2008
Zhang Long (China National Institute of Metrology)
Participating drafters:
Tong Lin (China National Institute of Metrology)
Bao Xuesong (China National Institute of Metrology)1
References·
Terms and measurement units
Metrological performance requirements·
Capacity cylinder| |tt||General technical requirements
Appearance requirements
Technical requirements for weighing devices
Marking·
Control of measuring instruments·.
Verification conditions
Verification items
Verification methods
Processing of verification results·
Verification cycle·
Appendix A
Appendix B
Appendix (
Appendix 1)
Schematic diagram of bulk density device
Geometric measurement method of bulk density
Verification method of non-self-propelled scale
JG 264—2008wwW.bzxz.Net
Verification record format of bulk density instrument (for reference) Appendix E
Verification certificate inner page format of bulk density instrument (for reference) Record
(2)
(2))
(3)
(4)
I Scope
JJG2642008
Verification procedure for bulk density instrument
This procedure applies to the initial verification, subsequent verification and Inspection in use 2 References
This regulation references the following documents:
JGI4-1997 "Non-housing indicating scale"
JG539-1997
Scientific indicating scale
GB1353-1999 "Metrics"
1985 Food and oil inspection method for bulk density determination GB5498-1
When using this regulation, attention should be paid to the use of the currently valid versions of the referenced documents. 3 Terminology and metrological instruments forming measuring the density of cereals 3.1 Bulk density instrument A measuring instrument that measures the mass of a certain volume and provides a basis for determining the grade of an object. 3.2 Bulk density measuring receptacle A conical receptacle with a standard capacity used to measure the mass of a substance. 3.3 Cereals Grains such as wheat, millet and corn are used as bulk density instruments. 3.4 Intermediate cylinder
trankition cylinder
Connects to the measuring cylinder,
allows the grain sample to fall through the funnel switch to the cylinder in the container 3.5.- Exhaust chain
en ptyng hammer
When in working state, the gas in the measuring cylinder falls into the cylinder at the bottom of the cylinder with the grain 3.6 Insert leveling
INAMETROLOGY
A woven flat plate used to level the contents in the measuring cylinder 3.7 Filling hopper
A distributor for diverting grains
3.8 Unit of measurement computationtuinitThe unit of measurement of the bulk density instrument is: g (gram/liter) 4 Overview
The bulk density instrument is mainly used to measure the quality of grain. It consists of a weighing system (digital indicating scale or non-self-indicating scale), a bulk cylinder, a grain tube and an intermediate cylinder. Its working principle is to use a volume cylinder with an exhaust chain to evenly distribute the measured grain in the volume cylinder to test the mass of the measured grain per unit volume. The structural diagram of the bulk density instrument is shown in Appendix 5. Metrological performance requirements
5.1 Volume cylinder
JJG 264-2008
The volume of the volume cylinder (from the top of the exhaust hammer to the lower edge of the notch) is, and the maximum allowable error is 2.0mL
5.2 Weighing instrument
The maximum test range of the scale is 1kg, and the verification division value is 1g; the accuracy is level, 6 General technical requirements
6.1 Appearance requirements
6.1, 1 The surface of the bulk density instrument should be flat and smooth, without obvious shrinkage marks, waste edges, cracks, bubbles and deformation; the surface coating of metal parts should not fall off, rust or peeling. 6.1.2 The connection between the cylinder body and the bottom of the volume cylinder must be firm and not loose. After the middle cylinder and grain cylinder are put on, they must be perpendicular to the bottom plate, and the whole device must be stable. 6.1.3 The parts of the bulk density instrument should not have obvious defects such as rust, dents, cracks, spikes, burrs, etc. Except for the clamping parts and the knife, all metal parts should be plated with nickel, chrome or other anti-corrosion layers. 6.1.1 The insert must be flat and smooth: there must be no coating shedding and surface rust. 6.1.5 When the bucket door buckle plate is pressed, the bucket door can automatically pop out, and the hole of the funnel should be fully opened. 6.2 Technical requirements for weighing devices
6.2.1 Digital indicating scales should comply with the requirements of Articles 3 to 4 of JI<539-1997 Digital Indicating Scales. 6.2.2 Non-self-indicating scales should comply with the requirements of Articles 3 to 4 of JJG14-1997 Non-automatic indicating scales 6.3 Marking
The bulk density instrument should have the following markings: product name, manufacturer! 'or trademark, nominal capacity (mI), model specification and factory number.
7 Measuring instrument control
The bulk density instrument control includes the initial calibration, subsequent calibration and in-use inspection. 7.1 Calibration conditions
7.1.1 The bulk density instrument shall be calibrated at room temperature of (20 + 5)°C and the room temperature change shall not exceed 1°C/h per day.
The calibration medium is clean water.
The calibration medium should be placed in the laboratory 21 hours in advance, so that the temperature difference between the common temperature and the normal temperature shall not exceed 12 (7.1.3
The bulk density device to be tested should be placed in the laboratory 1 hour before calibration. 7.1.5 Calibration equipment
The calibration equipment must be calibrated and within the calibration cycle. The main calibration equipment is shown in the table]: 2
Auxiliary equipment
Instrument name
Marking code
Standard adhesive code
Standard glass measuring instrument
Graduated pipette| |tt||Inner diameter meter
Micrometer
Depth vernier caliper
Thermometer
Organic glass insert
7.2 Verification items
Verification items are shown in Table 2.
Verification items
JJG264—2008
Main verification equipment
Measuring range
1g～500g
1000ml
(0～50）HI
(α25) mm
(0~-300) 1m
(0--50)C
Technical requirements
Second grade (bottle type)
Table 2 Verification items
Number verification
Note: "10" indicates items that should be verified: "2" indicates items that may not be verified. 7.3 Verification method
7.3.1 Appearance inspection
7.3.1.1 The appearance inspection shall be carried out in accordance with the provisions of Article 6.1 by using the national measurement and testing method. Subsequent verification
Capacity comparison method
Use of geometric measurement method
In-use inspection
7.3.1.2 Check the capacity cylinder, exhaust hammer, insert, and bucket door: They shall comply with the provisions of Articles 6.2 to 6.3. 7.3.2 Verification of weighing device
7. 3.2.1. The calibration of digital indicating scales shall be carried out in accordance with Article 5 of [JG539-1997 Digital Indicating Scales]. 7.3.2.2 For the calibration of non-indicating scales, see Appendix 7.3.3 Verification of volume cylinder
The verification of volume cylinder adopts the volume comparison method, that is, the volume of standard glass measuring instruments such as Sichuan is directly compared with the volumetric density instrument through the test medium, and its volume is determined after calibration. V. = Vn[1 +3(t — 20) 3(20- 12) + gw(ta — t)Where V—.--the capacity value of the volume cylinder at 20°C, I(1)
JIG264-2008
the capacity value of the standard glass measuring instrument at 20°C, L: the volume expansion coefficient of the volume cylinder, A: the volume expansion coefficient of water (generally 0.0002), C-: the measurement temperature when the standard glass measuring instrument is verified, C: the measurement temperature when the volume cylinder is verified.
7.3.31 Place the exhaust hammer into the volumetric cylinder: apply Vaseline oil to the gap between the exhaust hammer and the cylinder wall, and wipe off the excess Vaseline on the cylinder wall with cotton wool soaked in alcohol. 7.3.3.2 Pour 1000mL of measuring standard water
to the scale line, so that the lower edge of the meniscus is tangent to the upper edge of the scale line
.
73.3.3 Use a graduated pipette to draw out 2.0 mL of clean water from the mixing glass measuring vessel. At this time, the capacity of the standard glass measuring vessel is 998.0 mL.
Pour the clean water into the measuring vessel and fill it with water. 7.3.3.4 Gradually tilt the measuring vessel: Wait for 60 minutes after the water has run out. 7.3.3.5 Slowly and steadily push the organic film into the entire slot of the measuring cylinder to determine the volume of the container: (1) If the cylinder is filled with The product meets the requirements of Article 5.1 (2) If there are bubbles between the organic glass and the water, use a graduated pipette to draw an appropriate amount of water to fill until the bubbles disappear, and record the volume value discharged by the graduated pipette: Excess 2 volume: There are still bubbles in the volume cylinder, indicating that the volume does not meet the requirements of Article 51.
Actual volume in the volume cylinder
7.4 Verification results
After verification, the weigher will issue a verification certificate
For unqualified weighers, a verification result notice will be issued, and the unqualified items will be noted. The format of the verification form is shown in Appendix 7.5 Verification cycle
The verification of the weigher is 1 year.
METROL
Appendix A
JJG264—2008
Schematic diagram of bulk density instrument
SHOHNS
New subject of mathematics
Body density instrument
Container chart, 2 base 3
Non-gas tank: 6 Reset key:
9-Kitchen: 10 Telephone: 11-Electric scale: 12-1 Motor: 13-Electric bay
Figure A.2 Non-self-indicating scale type bulk density instrument
Main scale, 10 scale: 3 Auxiliary scale: 4 Auxiliary scale: 3 Capacity cylinder: 6# Support column: 7 Base Appendix B||t t||B1T Determination of the average height
JJG264-2008
Geometric measurement method of capacity cylinder
B1.1 Place the exhaust hammer into the capacity cylinder, and use a 300mm depth-caliper to measure the height Hi from the top of the capacity cylinder to the exhaust hammer: Insert the insert into the notch, and use a depth gauge to measure the height H from the top of the capacity cylinder to the insert; Pull out the insert, use a dry ruler to measure the thickness H of the insert, and record, h=H,-H
Where: h is the height, mm;
B1.2 Rotate the capacity cylinder 90°, repeat the measurement in B1.1, and calculate the average height h. h-h+h++h.
Where: h-—the first measurement value;
h2——the second The measurement value of the first measurement;
-nth measurement value (n≤4)
B2 Determination of inner diameter D:
B2.1. Use the gauge block and the adjusted inner diameter white scale to measure at the working height 1/4, 2/1, and 3/4 of the inner wall of the capacity cylinder; then rotate the capacity cylinder 90° and measure at three positions at the same working height: record six sets of data and calculate the average value. The difference between the maximum and minimum values shall not be greater than (.10mm. B3 Data processing
B3.1 Calculation of volume:
According to the measured data, calculate the actual volume of the capacity cylinder according to the following formula: V
B3.2 The actual capacity of the capacity cylinder shall comply with the provisions of Article 5.1. 6
Appendix C
1 Technical Technical requirements
1.1 Minimum sensitivity
LJG264—2008
Calibration method for non-self-indicating scales
When the scale is in a balanced state, apply an additional base weight, the value of which is the absolute value of the maximum allowable error of the magnetic code added at the moment, so that the constant displacement of the measuring lever caused by this should be at least 3mm. 1.2 Scale
1.2.1 The scale line width should not be greater than 0.8mm, and the spacing should not be less than 2mm. 1.2.2 The scale mark inner notch of the main scale on the double scale. 1.3 Swing
1.3.1 A certain force needs to be applied to the swimmer on the scale in order for it to move freely. 1.3.2 The movement of the swimmer on the scale should be limited to the position of the zero mark of the scale. 1.3.3 The swimmer inside The adjustment weight should be fixed in the swimming head cavity: the upper and lower parts of the swimming head should be tight and cannot be opened without tools. The "grips" on the swimming head should be in close contact with the two sides of the main scale graduation groove of the meter lever, but should not touch the bottom of the groove. The swimming head cannot move at all when the teeth are not picked up. 2 Calibration of scales
2.1 Set the swimming heads of the main and auxiliary scales to the zero graduation line position, and adjust the balance with the balance nut. 2.2 Determination of the balanced position of the metering lever
The metering lever moves up and down evenly in the sight gauge: its swing amplitude is not more than 1mm from the upper and lower edges of the sight gauge in the first cycle, and the metering base lever is in a balanced state. 2.3 Move the focus knife and the fulcrum knife smoothly to the -limit position along the longitudinal direction of their knife bearings, so that the friction reducing parts of the knife are in close contact with the knife bearing, and then Then move to the other extreme position. After each movement, the amplitude of the measuring lever is allowed to be reduced, but the distance from the upper and lower edges of the collimator should not exceed 10 mm. 2.4 Verification of the indication of the main scale
Move the soil free weight to the position of the "notch" of the maximum value of the main scale, put the corresponding base weight M in the capacity cylinder to balance it, and then calculate the division value of each "slot II" according to the following formula. M
The division number of the scale "notch" (excluding the zero point "notch"), add the weight according to the value of the product of m and the "notch gate" serial number (excluding the zero point "notch gate"), and test the "notch" division value one by one.
2.5 Verification of the indication of the auxiliary scale and 1/10 weighing sensitivity Move the small free weight to the maximum division value of the brush scale, and put the corresponding weight in the capacity cylinder to balance it. If the change of the static point of the tail end of the measuring lever is not less than 3 mm when adding or removing the magnetic code used to test the sensitivity during the balance, the sensitivity is considered to be unqualified.
If necessary, the auxiliary scale can be randomly inspected at any scale. 7
JJG264-2008
2.6 The accuracy of the maximum weighing and the sensitivity verification are large and small. Move the large and small free armor to the maximum scale value: Put the jade standard weight in the capacity cylinder and it should be balanced. If the small free weight used to test the sensitivity is added or removed during the balance, the change of the static point of the tail end of the measuring lever is not less than 3 mm, the sensitivity is considered to be unqualified.
2.7 Zero return test
Remove all free weights: Move the large and small free armor to the zero scale value, and it should be balanced. 2.8 During the entire verification process of the scale, if it is unbalanced, add or subtract the tolerance base weights of each weighing: it should be balanced or exceed the balance.3.5 Slowly and steadily push the organic film into the whole slot of the volume cylinder to determine the volume size: (1) If there is water in the cylinder, it means that the actual content in the volume cylinder meets the requirements of Article 5.1. (2) If there are bubbles between the organic glass film and the water, use a graduated pipette to draw an appropriate amount of water to fill it until the bubbles disappear, and record the volume value discharged by the graduated pipette: Exceeding 2 volume: There are still bubbles in the volume cylinder, indicating that the volume also does not meet the requirements of Article 51.
The actual content in the volume cylinder
7.4 Verification results
The qualified weighing device will issue a verification certificate
The unqualified weighing device will issue a verification result notice and indicate the unqualified items. The format of the verification form is shown in Appendix 7.5 Verification cycle
The verification of the volumetric weighing device is 1 year.
METROL
Appendix A
JJG264—2008
Schematic diagram of bulk density instrument
SHOHNS
New subject of mathematics
Body density instrument
Container chart, 2 base 3
Non-gas tank: 6 Reset key:
9-Kitchen: 10 Telephone: 11-Electric scale: 12-1 Motor: 13-Electric bay
Figure A.2 Non-self-indicating scale type bulk density instrument
Main scale, 10 scale: 3 Auxiliary scale: 4 Auxiliary scale: 3 Capacity cylinder: 6# Support column: 7 Base Appendix B||t t||B1T Determination of the average height
JJG264-2008
Geometric measurement method of capacity cylinder
B1.1 Place the exhaust hammer into the capacity cylinder, and use a 300mm depth-caliper to measure the height Hi from the top of the capacity cylinder to the exhaust hammer: Insert the insert into the notch, and use a depth gauge to measure the height H from the top of the capacity cylinder to the insert; Pull out the insert, use a dry ruler to measure the thickness H of the insert, and record, h=H,-H
Where: h is the height, mm;
B1.2 Rotate the capacity cylinder 90°, repeat the measurement in B1.1, and calculate the average height h. h-h+h++h.
Where: h-—the first measurement value;
h2——the second The measurement value of the first measurement;
-nth measurement value (n≤4)
B2 Determination of inner diameter D:
B2.1. Use the gauge block and the adjusted inner diameter white scale to measure at the working height 1/4, 2/1, and 3/4 of the inner wall of the capacity cylinder; then rotate the capacity cylinder 90° and measure at three positions at the same working height: record six sets of data and calculate the average value. The difference between the maximum and minimum values shall not be greater than (.10mm. B3 Data processing
B3.1 Calculation of volume:
According to the measured data, calculate the actual volume of the capacity cylinder according to the following formula: V
B3.2 The actual capacity of the capacity cylinder shall comply with the provisions of Article 5.1. 6
Appendix C
1 Technical Technical requirements
1.1 Minimum sensitivity
LJG264—2008
Calibration method for non-self-indicating scales
When the scale is in a balanced state, apply an additional base weight, the value of which is the absolute value of the maximum allowable error of the magnetic code added at the moment, so that the constant displacement of the measuring lever caused by this should be at least 3mm. 1.2 Scale
1.2.1 The scale line width should not be greater than 0.8mm, and the spacing should not be less than 2mm. 1.2.2 The scale mark inner notch of the main scale on the double scale. 1.3 Swing
1.3.1 A certain force needs to be applied to the swimmer on the scale in order for it to move freely. 1.3.2 The movement of the swimmer on the scale should be limited to the position of the zero mark of the scale. 1.3.3 The swimmer inside The adjustment weight should be fixed in the swimming head cavity: the upper and lower parts of the swimming head should be tight and cannot be opened without tools. The "grips" on the swimming head should be in close contact with the two sides of the main scale graduation groove of the meter lever, but should not touch the bottom of the groove. The swimming head cannot move at all when the teeth are not picked up. 2 Calibration of scales
2.1 Set the swimming heads of the main and auxiliary scales to the zero graduation line position, and adjust the balance with the balance nut. 2.2 Determination of the balanced position of the metering lever
The metering lever moves up and down evenly in the sight gauge: its swing amplitude is not more than 1mm from the upper and lower edges of the sight gauge in the first cycle, and the metering base lever is in a balanced state. 2.3 Move the focus knife and the fulcrum knife smoothly to the -limit position along the longitudinal direction of their knife bearings, so that the friction reducing parts of the knife are in close contact with the knife bearing, and then Then move to the other extreme position. After each movement, the amplitude of the measuring lever is allowed to be reduced, but the distance from the upper and lower edges of the collimator should not exceed 10 mm. 2.4 Verification of the indication of the main scale
Move the soil free weight to the position of the "notch" of the maximum value of the main scale, put the corresponding base weight M in the capacity cylinder to balance it, and then calculate the division value of each "slot II" according to the following formula. M
The division number of the scale "notch" (excluding the zero point "notch"), add the weight according to the value of the product of m and the "notch gate" serial number (excluding the zero point "notch gate"), and test the "notch" division value one by one.
2.5 Verification of the indication of the auxiliary scale and 1/10 weighing sensitivity Move the small free weight to the maximum division value of the brush scale, and put the corresponding weight in the capacity cylinder to balance it. If the change of the static point of the tail end of the measuring lever is not less than 3 mm when adding or removing the magnetic code used to test the sensitivity during the balance, the sensitivity is considered to be unqualified.
If necessary, the auxiliary scale can be randomly inspected at any scale. 7
JJG264-2008
2.6 The accuracy of the maximum weighing and the sensitivity verification are large and small. Move the large and small free armor to the maximum scale value: Put the jade standard weight in the capacity cylinder and it should be balanced. If the small free weight used to test the sensitivity is added or removed during the balance, the change of the static point of the tail end of the measuring lever is not less than 3 mm, the sensitivity is considered to be unqualified.
2.7 Zero return test
Remove all free weights: Move the large and small free armor to the zero scale value, and it should be balanced. 2.8 During the entire verification process of the scale, if it is unbalanced, add or subtract the tolerance base weights of each weighing: it should be balanced or exceed the balance.3.5 Slowly and steadily push the organic film into the whole slot of the volume cylinder to determine the volume size: (1) If there is water in the cylinder, it means that the actual content in the volume cylinder meets the requirements of Article 5.1. (2) If there are bubbles between the organic glass film and the water, use a graduated pipette to draw an appropriate amount of water to fill it until the bubbles disappear, and record the volume value discharged by the graduated pipette: Exceeding 2 volume: There are still bubbles in the volume cylinder, indicating that the volume also does not meet the requirements of Article 51.
The actual content in the volume cylinder
7.4 Verification results
The qualified weighing device will issue a verification certificate
The unqualified weighing device will issue a verification result notice and indicate the unqualified items. The format of the verification form is shown in Appendix 7.5 Verification cycle
The verification of the volumetric weighing device is 1 year.
METROL
Appendix A
JJG264—2008
Schematic diagram of bulk density instrument
SHOHNS
New subject of mathematics
Body density instrument
Container chart, 2 base 3
Non-gas tank: 6 Reset key:
9-Kitchen: 10 Telephone: 11-Electric scale: 12-1 Motor: 13-Electric bay
Figure A.2 Non-self-indicating scale type bulk density instrument
Main scale, 10 scale: 3 Auxiliary scale: 4 Auxiliary scale: 3 Capacity cylinder: 6# Support column: 7 Base Appendix B||t t||B1T Determination of the average height
JJG264-2008
Geometric measurement method of capacity cylinder
B1.1 Place the exhaust hammer into the capacity cylinder, and use a 300mm depth-caliper to measure the height Hi from the top of the capacity cylinder to the exhaust hammer: Insert the insert into the notch, and use a depth gauge to measure the height H from the top of the capacity cylinder to the insert; Pull out the insert, use a dry ruler to measure the thickness H of the insert, and record, h=H,-H
Where: h is the height, mm;
B1.2 Rotate the capacity cylinder 90°, repeat the measurement in B1.1, and calculate the average height h. h-h+h++h.
Where: h-—the first measurement value;
h2——the second The measurement value of the first measurement;
-nth measurement value (n≤4)
B2 Determination of inner diameter D:
B2.1. Use the gauge block and the adjusted inner diameter white scale to measure at the working height 1/4, 2/1, and 3/4 of the inner wall of the capacity cylinder; then rotate the capacity cylinder 90° and measure at three positions at the same working height: record six sets of data and calculate the average value. The difference between the maximum and minimum values shall not be greater than (.10mm. B3 Data processing
B3.1 Calculation of volume:
According to the measured data, calculate the actual volume of the capacity cylinder according to the following formula: V
B3.2 The actual capacity of the capacity cylinder shall comply with the provisions of Article 5.1. 6
Appendix C
1 Technical Technical requirements
1.1 Minimum sensitivity
LJG264—2008
Calibration method for non-self-indicating scales
When the scale is in a balanced state, apply an additional base weight, the value of which is the absolute value of the maximum allowable error of the magnetic code added at the moment, so that the constant displacement of the measuring lever caused by this should be at least 3mm. 1.2 Scale
1.2.1 The scale line width should not be greater than 0.8mm, and the spacing should not be less than 2mm. 1.2.2 The scale mark inner notch of the main scale on the double scale. 1.3 Swing
1.3.1 A certain force needs to be applied to the swimmer on the scale in order for it to move freely. 1.3.2 The movement of the swimmer on the scale should be limited to the position of the zero mark of the scale. 1.3.3 The swimmer inside The adjustment weight should be fixed in the swimming head cavity: the upper and lower parts of the swimming head should be tight and cannot be opened without tools. The "grips" on the swimming head should be in close contact with the two sides of the main scale graduation groove of the meter lever, but should not touch the bottom of the groove. The swimming head cannot move at all when the teeth are not picked up. 2 Calibration of scales
2.1 Set the swimming heads of the main and auxiliary scales to the zero graduation line position, and adjust the balance with the balance nut. 2.2 Determination of the balanced position of the metering lever
The metering lever moves up and down evenly in the sight gauge: its swing amplitude is not more than 1mm from the upper and lower edges of the sight gauge in the first cycle, and the metering base lever is in a balanced state. 2.3 Move the focus knife and the fulcrum knife smoothly to the -limit position along the longitudinal direction of their knife bearings, so that the friction reducing parts of the knife are in close contact with the knife bearing, and then Then move to the other extreme position. After each movement, the amplitude of the measuring lever is allowed to be reduced, but the distance from the upper and lower edges of the collimator should not exceed 10 mm. 2.4 Verification of the indication of the main scale
Move the soil free weight to the position of the "notch" of the maximum value of the main scale, put the corresponding base weight M in the capacity cylinder to balance it, and then calculate the division value of each "slot II" according to the following formula. M
The division number of the scale "notch" (excluding the zero point "notch"), add the weight according to the value of the product of m and the "notch gate" serial number (excluding the zero point "notch gate"), and test the "notch" division value one by one.
2.5 Verification of the indication of the auxiliary scale and 1/10 weighing sensitivity Move the small free weight to the maximum division value of the brush scale, and put the corresponding weight in the capacity cylinder to balance it. If the change of the static point of the tail end of the measuring lever is not less than 3 mm when adding or removing the magnetic code used to test the sensitivity during the balance, the sensitivity is considered to be unqualified.
If necessary, the auxiliary scale can be randomly inspected at any scale. 7
JJG264-2008
2.6 The accuracy of the maximum weighing and the sensitivity verification are large and small. Move the large and small free armor to the maximum scale value: Put the jade standard weight in the capacity cylinder and it should be balanced. If the small free weight used to test the sensitivity is added or removed during the balance, the change of the static point of the tail end of the measuring lever is not less than 3 mm, the sensitivity is considered to be unqualified.
2.7 Zero return test
Remove all free weights: Move the large and small free armor to the zero scale value, and it should be balanced. 2.8 During the entire verification process of the scale, if it is unbalanced, add or subtract the tolerance base weights of each weighing: it should be balanced or exceed the balance.1. 6
Appendix C
1 Technical requirements
1.1 Minimum sensitivity
LJG264—2008
Verification method for non-self-indicating scales
When the scale is in a balanced state, apply an additional base code, the value of which is the absolute value of the maximum allowable error of the magnetic code added at the moment, and the constant displacement of the measuring lever caused by this should be at least 3mm. 1.2 Scale
1.2.1 The scale line width should not be greater than 0.8mm, and the spacing should not be less than 2mm. 1.2.2 The scale mark inner notch of the main scale on the double scale. 1.3 Swimming pool
1.3.1 The swimming pool needs to apply a certain force on the scale to move freely. 1.3.2 The free weight should be limited to the position of the zero mark on the scale when it moves on the scale. 1.3.3 The adjustment weight in the free weight should be fixed in the free weight cavity: The upper and lower parts of the free weight should be tight and cannot be opened without tools. The "grips" on the free weight should be in close contact with the two sides of the scale scale indexing groove of the mouse lever, but should not touch the bottom of the groove. The free weight should not move without picking up the teeth. 2 Verification of scales
2.1 Set the free weights of the main and auxiliary scales to the zero scale scale position and adjust the balance with the balance nut. 2.2 Determination of the balanced position of the metering lever
The metering lever makes an even swing up and down in the collimator: the distance between its swing amplitude and the upper and lower edges of the collimator in the first cycle is no more than 1mm, and the metering lever is in a balanced state. 2.3 Move the focus knife and the fulcrum knife smoothly to the extreme position along the longitudinal direction of their knife bearings respectively, so that the friction reducing parts of the knife are in close contact with the knife bearing, and then move them to the other extreme position. After each movement, the amplitude of the metering lever is allowed to be reduced, but the distance from the upper and lower edges of the collimator should not exceed 10 2mm. 2.4 Verification of the indication of the main scale
Move the plunger to the position of the "notch" of the maximum value of the main scale, put the corresponding weight M in the capacity cylinder to balance it, and then calculate the graduation value m of each "notch II" according to the following formula. M
Scale "notch" graduation number (excluding zero "notch"), add and place codes according to the value of the product of m and "notch gate" serial number (excluding zero "notch gate"), and test the "notch" graduation value one by one.
2.5 Verification of the secondary scale indication and 1/10 weighing sensitivity Move the small free weight to the maximum graduation value of the brush scale, and place the corresponding code in the capacity cylinder to balance. If the change of the static point of the tail end of the metering lever is not less than 3mmn when adding or removing the magnetic code used for testing sensitivity during weighing, it is considered that the sensitivity is not less than 1 grid.
If necessary, the secondary scale can be randomly inspected at any graduation.7||tt| |JJG264-2008
2.6 Verification of the accuracy and sensitivity of the maximum weighing: the large and small sliding armor are moved to the maximum scale value: the jade weight placed in the capacity cylinder should be able to balance. If the small weight used to test the sensitivity is added or removed during balance, the change of the static point at the tail end of the measuring lever is not less than 3 times the m, then the sensitivity is considered unqualified
2.7 Zero return test
Remove all the weights: the large and small sliding armor are moved to the zero scale value, and it should be able to balance. 2.8 During the entire verification process of the scale, if it is unbalanced, add or subtract the tolerance weights of each weighing: it should be able to balance or exceed the balance.1. 6
Appendix C
1 Technical requirements
1.1 Minimum sensitivity
LJG264—2008
Verification method for non-self-indicating scales
When the scale is in a balanced state, apply an additional base code, the value of which is the absolute value of the maximum allowable error of the magnetic code added at the moment, and the constant displacement of the measuring lever caused by this should be at least 3mm. 1.2 Scale
1.2.1 The scale line width should not be greater than 0.8mm, and the spacing should not be less than 2mm. 1.2.2 The scale mark inner notch of the main scale on the double scale. 1.3 Swimming pool
1.3.1 The swimming pool needs to apply a certain force on the scale to move freely. 1.3.2 The free weight should be limited to the position of the zero mark on the scale when it moves on the scale. 1.3.3 The adjustment weight in the free weight should be fixed in the free weight cavity: The upper and lower parts of the free weight should be tight and cannot be opened without tools. The "grips" on the free weight should be in close contact with the two sides of the scale scale indexing groove of the mouse lever, but should not touch the bottom of the groove. The free weight should not move without picking up the teeth. 2 Verification of scales
2.1 Set the free weights of the main and auxiliary scales to the zero scale scale position and adjust the balance with the balance nut. 2.2 Determination of the balanced position of the metering lever
The metering lever makes an even swing up and down in the collimator: the distance between its swing amplitude and the upper and lower edges of the collimator in the first cycle is no more than 1mm, and the metering lever is in a balanced state. 2.3 Move the focus knife and the fulcrum knife smoothly to the extreme position along the longitudinal direction of their knife bearings respectively, so that the friction reducing parts of the knife are in close contact with the knife bearing, and then move them to the other extreme position. After each movement, the amplitude of the metering lever is allowed to be reduced, but the distance from the upper and lower edges of the collimator should not exceed 10 2mm. 2.4 Verification of the indication of the main scale
Move the plunger to the position of the "notch" of the maximum value of the main scale, put the corresponding weight M in the capacity cylinder to balance it, and then calculate the graduation value m of each "notch II" according to the following formula. M
Scale "notch" graduation number (excluding zero "notch"), add and place codes according to the value of the product of m and "notch gate" serial number (excluding zero "notch gate"), and test the "notch" graduation value one by one.
2.5 Verification of the secondary scale indication and 1/10 weighing sensitivity Move the small free weight to the maximum graduation value of the brush scale, and place the corresponding code in the capacity cylinder to balance. If the change of the static point of the tail end of the metering lever is not less than 3mmn when adding or removing the magnetic code used for testing sensitivity during weighing, it is considered that the sensitivity is not less than 1 grid.
If necessary, the secondary scale can be randomly inspected at any graduation.7||tt| |JJG264-2008
2.6 Verification of the accuracy and sensitivity of the maximum weighing: the large and small sliding armor are moved to the maximum scale value: the jade weight placed in the capacity cylinder should be able to balance. If the small weight used to test the sensitivity is added or removed during balance, the change of the static point at the tail end of the measuring lever is not less than 3 times the m, then the sensitivity is considered unqualified
2.7 Zero return test
Remove all the weights: the large and small sliding armor are moved to the zero scale value, and it should be able to balance. 2.8 During the entire verification process of the scale, if it is unbalanced, add or subtract the tolerance weights of each weighing: it should be able to balance or exceed the balance.
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