Abstract: The data logging program named Data Logger is included with the MultiVu test software of the physical property measurement system, and it can record the working parameters of the device in background. Data Logger can be carried out simultaneously with magnetic measurement work, which helps testers to understand the working state of the equipment, ensure the accuracy of the measurement, and easy to calculate the test duration. However, it was found that the program will occupy too much hardware resources due to the increase of recording data amount and the decrease of sampling interval, even can cause data points loss and curves fluctuation in magnetic measurement. According to the analysis of technical documents, the cause of the impact was not the computer, but the processing power limit of the Model 6000 control module in physical property measurement system. Therefore, when using the Data Logger, it is necessary to choose reasonable parameters of recording data amount and sampling interval to ensure the data quality of test results.