Article abstract: This paper summarizes some experience or lessons after I participated in the comparison test of electronic scale verification device, hoping to be helpful to those in need. 
Key words: electronic scale; comparison; comparison sample; leading laboratory; reference laboratory; reference value; comparison result; uncertainty; normalized deviation En
According to the JJF 1117-2010 "Measurement Comparison", the comparison is a process, "under the specified conditions, the value of the same measurement benchmark and the amount of measurement standards at the same amount,
The process of comparison, analysis and evaluation. "In general, comparison is that different laboratories use their respective measurement benchmarks or standards to verify or test the same comparison sample under the same conditions, compare and analyze the results of the income, and determine a series of reasonable results. Activity.
How to ensure the accuracy of the measurement comparison of the electronic scale testing device to compare the measurement standards of each laboratory, and the weekly inspection
It is a commonly used method, a method of traceability. The best measures are comparison of the consistency of the weighing performance test capacity, the accuracy of the equipment, and the technical level of the verification personnel.
In order to ensure the accuracy and consistency of the electronic scale verification capacity and quantitative value transmission within the area, market supervision departments in various regions will specifically organize the measurement and comparison activities of the electronic scale testing device.
Organizers who compare activities are generally market supervision departments in the corresponding region. The executors are leading laboratories, and other participants are reference laboratories.
The purpose of the comparison of the electronic scale testing device is to test and improve the level of various laboratories. The purpose of the reference laboratory is to achieve the expected effect by comparing the results. In the process of strictly operating in accordance with the rules and specifications, compare the measurement performance of the sample as much as possible. Pay attention to the details of the operation process, and consider the uncertain factors as much as possible in order
Reasonable results: en <1.