Period verification of electronic balance in drug testing laboratories and uncertainty assessment of its indication error

In order to ensure the normal operation of the electronic balance in the drug testing laboratory and the accuracy and reliability of the test data, the electronic balance in the drug testing laboratory was checked during the period according to the JJG 1036-2008, and the uncertainty of the indication error was evaluated according to the JJF 1847-2020. The results show that the verification results were qualified, the expanded uncertainty was 2. 5×10^-4, the electronic balance could detect the sample normally.