​Note for electronic floor scale verification

1. Observe the appearance inspection of electronic floor scales

Before formal verification, the electronic floor scale shall be visually measured, the observation period accuracy and manufacturing license mark shall be observed, and the weighing, registration and number shall be known, and the grading value shall be verified. The actual indexing value and verification indexing value are analyzed in detail. Through the analysis of the previous work, we can find that many floor scale manufacturing enterprises are not strict and standard in the manufacturing of floor scale. Even some electronic scales in the value of the identification and the actual value of the classification is not the same, the existence of these problems to the verification work better, brought a lot of difficulties. The reason for this situation lies in that the nameplate labeling of weighbridge manufacturers is not standard enough, and the verification of inspectors is not carried out in strict accordance with the relevant regulations. The above phenomenon can be judged as a sign of unqualified.

2. Related requirements for standard equipment

In the formal verification of electronic floor scale, if the practical standard  weight, there may be some error, but the error value should be less than 1/3 of  the maximum allowable error. Such as Max = 30 kg (e = 10 g) electronic scale, the M2 registration farmar can good meet the practical need to test, but at work, often use is M1 level or more than M1 level standard weight, want to will error measured electronic floor scale, also needs to be some small weight, 0.1 e generally need about poetry about 1 g small weight, such ability can do 30 kg electronic floor scale daily verification.

3. Proper weighing point should be selected during weighing test

First of all, for the local weighing range, the selection of weighing point should include the maximum allowable error and inflection point. Secondly, when selecting test points, the indexing value should not be chosen to change the point weighting. For dividing value change point just in the range of two local weighing cross part, if choose this point to test, then applying weight scales are of equal value for value, then the index value will automatically switch, by original ei automatic into ei + 1. The actual weighing range will also be a certain scale of transformation, local weighing the scope of the transition to the next. Maxi is often not tested during testing, and in order to ensure that the local scale test is continuous, a weight less than 5e should be chosen for testing Maxi.

4. Problems in determining the weight of the two skins during the skin removal weighing test

(I)  The determination of the first tare weight value shall ensure that the number is higher than the minimum scale weight and smaller than the first maximum allowable error change point. The net weight range of the electronic scale is the maximum scale to be skinned. The actual size of the scale will affect the range of the net scale. Therefore, when selecting the minimum scale, the first tare weight should be less than or equal to 500e, which can make the best efforts to ensure the true integrity of the mpe of the scale.

(ii)  Determination of the second tare value when selecting the second tare value, the tare value between the first maximum allowable error change point and the second maximum allowable error change point can be selected, so as to ensure that there are two segmented error limits in the net weight range of the scale.