A description of the linear accuracy of the one-thousandth electronic balance

Date:2019-08-05

A description of the linear accuracy of the 0.001g electronic laboratory scales

1. Stability:

Stability can be divided into long-term stability and instantaneous stability. Long-term stability means that the environmental temperature of the electronic balance does not change much, while instantaneous stability means that the value displayed by the balance is displayed immediately and remains unchanged after the balance is placed on the measured object. After electrification, the variation difference of the same supplement weight in different time periods is maintained for a long time. The smaller the difference of the above parameters is, the more stable the performance of the electronic balance is.

2. Linear accuracy:

Linearity is also a very important index to measure the 0.001g precision balance, which mainly refers to the deviation between the display value and the precision value within the whole weighing range. The electronic balance with poor quality is difficult to obtain accurate weighing value in the range of electronic balance, even after the full range calibration. 0.001g magnetic hydro balance

Electronic balance has been widely used in industrial production, scientific research and trade due to its advantages of simple operation, accurate and reliable weighing. Then, how to classify the analytical balance and determine its tolerances? For example, some electronic balances clearly specify the actual scale dividing value d, but fail to indicate its verification dividing value e. For users, they may mistakenly believe that d=e and believe that the small value that the electronic balance can distinguish is the accurate value that it can weigh. For metrological verification personnel, it is very important to determine the dividing value e of the verification scale of electronic balance, because e is used to evaluate the accuracy level and the large allowable error. If the maximum error of each parameter index is less than 10d, we determine e=l0d. Sometimes it depends on the specific situation. For example, when d:0.2mg, e=5d; D: at 0.5mg, e=2d. In short, the dividing value of the verification scale should be divided according to the following formula :l×l0k or 2×10k or 5×10kk is positive integer, negative integer or zero). We classify all cases except e=d as ≠d, where e=l0d is common. The following is the classification of electric balance and the summary of its large permissible error according to the verification grade value e.