At present, electronic weighing instruments have been widely used in fields such as medical care and industrial production
It has been used more and more, and it can improve in scientific research and production
Accuracy. However, as time goes by, for various reasons,
The final inspection results of electronic weighing instruments will have a significant deviation and cannot be very accurate
It well reflects its practical use. Therefore, there must be a certain amount
Staff members must strictly abide by the relevant regulations and also take the following measures
A set of effective protective measures to improve the accuracy of its test results.
1
The structure and key points of use of electronic weighing instruments
At present, one of the more commonly used measuring devices is the electronic weighing instrument.
Components such as the weighing platform, display screen, level gauge, and level adjustment screws
It precisely measures the mass of the object under test by using electromagnetic force. Will be tested
After the test object is placed on the weighing platform, the voltage on it will change
Change, and then display the specific mass of the measured object on the monitor. With
With the advancement of science and technology, the uses and functions of electronic weighing instruments are constantly evolving
To improve, the following issues should be considered in practical operation: First, it should possess
The ability of automatic correction is omitted compared with ordinary mechanical scales
Calibration steps, thereby greatly reducing the operation process. The second point is during operation
Be careful not to apply excessive force, which may cause damage to the structure of the instrument
It causes deviations in instrument calibration. The third point is that the temperature of the measured object itself cannot be measured
It should not be too high or too cold. It should be kept as close as possible to the indoor environment
The status. Fourth, the test subject must not be held directly in the hand
Prevent errors caused by human interference.
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2.1
The contents of metrological verification for electronic weighing instruments
Error verification
The most notable application feature of electronic weighing instruments is precise measurement. Because of
Therefore, during the verification process, the staff should pay special attention to error checking
The effect on the measurement results of electronic weighing instruments. Decide on the instruments in advance
It allows for the maximum error and load, and determines the error of the force it bears
Error margin and repetitive errors.
2.2
Balance verification
The accuracy of balance verification is directly related to the credibility of the measurement results
Therefore, the verification of balance should be given due attention in the inspection work
One aspect of it. Usually, when balancing, two loading points need to be determined first.
When the loads are equal, the deviation between these two loading points should always be
Within the permitted range. When the new type of electronic weighing instrument is put into use,
The relevant inspectors must do the balancing work in advance to avoid any impact
The accuracy of its measurement results.
2.3
Eccentric load verification
When conducting load tests on electronic weighing instruments under various working conditions
Generate various errors. The measurement error when using the reference state
It should be the maximum and minimum deviations, and the test result should be the maximum
The load. Under normal working conditions, the deviation of its measurement should be
The difference between the center of the instrument and the displayed value. In this way, the relevant departments
The bias method can be adopted to test electronic weighing instruments.
one
2.4
Sensitivity and discrimination test
Spiritual sensitivity refers to the situation when measuring the change in the mass of an object.
The degree of response of electronic weighing instruments to signals, while resolution refers to the response under external force
The response speed of electronic weighing instruments under action. Before being officially put into use
First, it is necessary to conduct tests on its sensitivity and discrimination to make a judgment
Determine its accuracy to ensure that the inspected value is consistent with the true value.
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3.1
Factors affecting the metrological verification of electronic weighing instruments
Environmental factors
When using electronic weighing instruments for measurement, attention should be paid to various environments
The influence of factors on measurement accuracy. According to the current application specifications, in
When conducting measurement work, electronic weighing instruments should be placed as close as possible
In a relatively suitable, dry and stable environment, both indoors and outdoors
The temperatures are relatively stable, which can ensure the measurement to the greatest extent
Accuracy. If the humidity around has changed significantly, relatively
When the humidity exceeds 80%, remeasurement at this time will cause a significant error. No
It has practical application value. Therefore, the electronic weighing instrument is being calibrated for measurement
When conducting experiments, the influence of environmental factors should be given full attention.
3.2
Operational factors
When using electronic weighing instruments for metrological calibration, the following should be emphasized
Matters. First, it is necessary to do a good job in all protective measures to ensure the appearance of the instrument
Keep clean and tidy to prevent contamination, dust and other substances from adversely affecting the measurement results
The influence. Second, it is necessary to ensure that the storage area of electronic weighing instruments is dry.
Prevent the electronic weighing instrument components from being damaged by long-term humidity
Erosion leads to significant deviations in measurement data. Third, we should proceed in accordance with the standards
Be familiar with various measurement procedures and understand various electronic weighing instruments
Maximum weighing capacity to prevent objects from toppling over due to overloading, thus avoiding any adverse effects
It affects the accuracy of the test and, in severe cases, may even damage the electronic weighing instrument. four
Most electronic weighing instruments have the function of automatic calibration, so in
When starting up, the relevant staff should not only rely on the numbers for verification
Before calibrating electronic weighing instruments, it is necessary to follow the relevant procedures
Reset the operating procedures of the key to zero.
3.3
Human factors
In the process of using electronic weighing instruments for item quality inspection,
It is essential to eliminate the interference of human interference on the measurement accuracy. In order to make the test
To ensure the objectivity and reliability of the test data, relevant staff members are using electronic scales
When using the instrument, make sure that the electronic weighing instrument can automatically reset to zero. In order to ensure
The accuracy of the test must fully leverage the effect of peeling, so there is
Staff members should work in accordance with the pre-established work procedures.
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4.1
The correct usage method of electronic weighing instruments
Place
The electronic weighing instrument should be placed on a flatter workbench
Go up and adjust it to a horizontal position. If the instrument has
If you have your own level gauge, then you must ensure that there are always bubbles on the level surface
It's in the center. If a bubble deviates, it must be based on the bubble's
Adjust the position appropriately to ensure that the electronic weighing instrument can always maintain water
Lay flat.
4.2
Calibration
There are two calibration methods for electronic weighing instruments: one is external calibration.
One type is internal calibration. What is displayed on the monitor after the device is started
"Zero" can only prove its stability at zero point, but cannot reflect the instrument
Whether the instrument measurement and measurement specifications meet the requirements. Therefore, in the official launch
When in use, it should be calibrated in advance according to the instructions. It is strictly prohibited to do so
Put it into human use when the number on the monitor is 0.
4.3
Preheat
During the preheating process of the electronic weighing instrument, sensor one in the electronic weighing instrument
It is in a dormant state all the time and has a weak recovery ability. If it continues to be measured, it will be counterproductive
The zeroing result of the surface has an adverse effect, leading to duplicate and inaccurate values
Stable. The correct approach should be to place the heaviest code on the weighing platform
Put it on and then remove it. Repeat this process to allow the sensor to move slowly
Enter the working state to ensure the stability of the electronic weighing instrument.
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5.1
Ways to improve the accuracy of electronic weighing instrument verification
Environmental management
In the process of using electronic weighing instruments, in order to prevent external interference
To minimize it, the following measures can be taken. First of all, to avoid the long term
Exposed to direct sunlight, blackout curtains were added indoors to prevent direct exposure
Interference in measurement quality. The measurement location should be as far away from the vibration frequency as possible
For complex railways and highways, appropriate seismic measures should also be taken if necessary
Measures. During the measurement process, it is necessary to avoid high temperatures and high temperatures as much as possible
Measurement should be carried out in environments with magnetic fields, high radiation, etc., to ensure the measurement results
Accuracy. Secondly, it is necessary to keep the test site as constant as possible
Keep the temperature above 20℃ and the humidity within 40%.
The tester can measure the amount of desiccant in the room as needed
Appropriate adjustment. Thirdly, the workshop should be kept as clean as possible
There is dust, if there is dust. Workers should use brushes and wet cloths in time
Wipe to ensure the accuracy of the measurement. In practice, it is necessary to ensure the workshop
There should be no flowing air or corrosive air inside, and it is necessary to ensure the operation
Ensure the stability of the workbench to avoid affecting the measurement results.
5.2
Appliance Management
To prevent electronic weighing instruments from malfunctioning, metrologers should maintain them frequently
Maintenance. Adopting appropriate maintenance methods can effectively improve the instrument
2
Its own working life and ensure the accuracy of its measurement results. The first
First, it is necessary to prevent the device from vibrating as much as possible and use explosion-proof electricity
When using sub-weighing instruments for measurement, operate in accordance with explosion-proof regulations and keep an eye on explosions at all times
Explosion is dangerous. Secondly, in practice, it is usually necessary to ensure the measurement as much as possible
When testing the dryness of the environment, and when using explosion-proof electronic weighing instruments, it should be in
It should be carried out in a hot, dark and humid environment to reduce the number of people at the test site
Number. Thirdly, within the working range of electronic weighing instruments, there must be no possession
Corrosive objects must not be present, nor should there be any punctural objects to prevent allergic reactions
Biochemical erosion can damage the instrument's casing and internal components
Item. Fourth, to prevent electronic weighing instruments from being exposed to solar radiation, it is necessary to use
During use, it should be kept away from strong light as much as possible. electricity
The sub-weighing instrument itself is a relatively sensitive instrument to the external environment.
If exposed to the sun and the temperature rises, it will cause damage to the instrument.
In addition, it is best not to use electronic scales during thunderstorms
Before completely cutting off the power supply, the switch should be turned off first to prevent
A lightning accident occurred. Fifth, special attention should be paid to stillness during the measurement process
The influence of electricity on measurement results. When electronic weighing instruments need temporary maintenance
When troubleshooting, special attention should be paid to electromagnetic disturbances caused by static electricity
Move. When disassembling the circuit board, please make sure to firmly grasp the corners and the base. Cut
Do not touch the component pins below. If there is static electricity inside household appliances, then
Then the integrated components of the printed circuit board will be damaged. So, engineers
The removed PCB boards should be placed in a dedicated insulating bag. Do not
Place the PCB board on the table to avoid causing extensive damage to the device.
In addition, when reassembling the PCB board, one should also be careful to prevent it
The occurrence of static electricity problems.
5.3
Personnel training
In the practice of measurement, the knowledge reserves and experience of the staff
Both the accumulation and application levels will have a direct impact on the accuracy of its measurement
Impact. In the process of using electronic weighing instruments for measurement work, there are
Relevant personnel must have a prior understanding of various types of electronic weighing equipment
The specific operation process, measurement methods and equipment parameters, as well as various
The measurement results of electronic weighing instruments are accurately determined. Furthermore, in order
To ensure measurement accuracy, measurement work must be carried out in accordance with the working environment in which it is located
Have a full understanding. The relevant units and departments should handle all operations
Personnel should receive comprehensive and systematic education, training and management to enable them
Be able to have a comprehensive understanding of the standard operation methods of various equipment and be clear about the standards
Standardize the significance of work and adjust one's working attitude in a timely manner.
Carry out innovations in working methods to enable employees to adopt a positive attitude
Devote oneself to the measurement work and conduct tests for all possibilities
Predict the problems that may occur in advance and provide countermeasures
Ensure the reliability of the test.
6
Conclusion
Due to the combined effect of various factors, when it comes to the electronic scale
During the measurement process of the instrument, it is necessary to manage it well
To improve one's professional skills, one should follow the requirements of the norms
In addition to work, it is also necessary to do a good job in regular maintenance and ensure it through various methods
Ensure the high precision of electronic weighing instruments and carry out maintenance on them to guarantee their stability
It can maintain good performance and improve the inspection results under any circumstances
It ensures the accuracy of the results and can greatly improve the use of electronic weighing instruments
Years of service enable it to function better.