calibration testing is verified that the metrological and other characteristics of certain subjects and their similarity with the passport data.Such actions are carried out by designated persons in designated premises, and the use of specialized equipment.These actions are called - Verification of the balance.
Types verifications
- Initial verification is carried out at the time of issue of the balance of production or after repair.Also, such a procedure is performed during the import.
- Periodic calibration is applied to the means of verification that have already been commissioned.It is carried out once a year.
- extraordinary verification is used when there is any technical damage, as in the case when the balance for a long time stored, and then were brought into operation.
- inspection verification performed during metrological supervision.
State have the right to carry out verification experts of federal agencies that are engaged in technical coordination and belong to state verification.In the case where the measuring meet all the requirements, it is believed that they have been calibrated.If as a result of verification revealed some problems, instead of a passport is issued a certificate that the device is not suitable for consumption.These scales require repair or calibration.If verification is successful, then the owner shall retain the corresponding certificate and stamp imprint remains on the balance attorneys.
Stages calibration weights desktop
all there are three stages.The first step is checking without load.At this stage, it is checked as the scales are properly installed, and how they respond to an attempt to turn them off balance.In the second stage verification is performed using weights, the weight of which is approximately 1/10 of the load from the biggest border weighing.The weight is usually put in the center and on the sides, while readings must be equal to the mass of the weight.The third stage determines the accuracy with which the work scales, taking into account the maximum load.In this case, the weight is set only on the center sensitivity weights while not checked.
methods for verification of balances
Verification of the balance is carried out in two ways.The first - a statistical.It provides a measure of the efforts made to check sensor and exhibited samples.That is, this method is applied to the model, and the believed weights.The disadvantage of this method consists in checking that the results may be inaccurate.Another disadvantage of this method - is that the believed instrument is not in use.Dynamic method of checking of conveyor devices or appliances continuous - weighing control sample.The disadvantage of this method is that the process is very laborious, while the verification result will be inaccurate.Products that will be weighed must be in the bunker, which is physically perform is simply unrealistic.Also, the samples must be available balance is not always possible.In this method, the balance is not operated in accordance with staffing.
Electronic scales
Verification of electronic scales includes several stages of work: research and testing of the device's meteorological parameters in the identification, measurement variability of weights, which are not subjected to stress.It also includes recognition of error indications of the tested device, the sensitivity of the balance.If the balance is not passed the appropriate verification, they are not allowed to operate.
Verification of the balance (the frequency of this procedure - once a year) is carried out according to the legislative documents "On metrology and metrological activity".Periodic calibration is required for all the scales are in operation.
Methods of verification of weights
The documents Operating weights prescribed conditions that must be observed without fail.When is calibration weights must clearly meet the performance level as temperature, humidity, atmospheric pressure.During external examination is usually set for cracks and corrosion, control all items must be in their places, according to the documents on the operation.If this crane device, the passport must be evidence for his trial on the strength of the crane hook.At the time of sampling weights must be identified, as they are good, are not overloaded administrative apparatus.During the determination of the boundaries of the metrological check the volatility of the balance in the absence of any of these loads.Metrological borders calculated by estimating weights 4th category.If the results turned out to be positive, it is noted in the passport and make the impression on the scale stamp that indicates the suitability for use of weights.If the verification result is negative, the balance is not used.
