Abstract:In this paper, the zero drift characteristics of the newly introduced four CG-6 relative gravimeters are studied.The results show that the static zero drift rate, mixed zero drift rate, and dynamic zero drift rate of the four gravimeters are less than 8 mGal/h, which meets the technical specifications given by the manufacturer. However, in a long period of time, the zero drift of each instrument has different degrees of nonlinear characteristics, indicating that the zero-drift rate is unstable. Therefore, in long-term field observation and subsequent data processing, it is not appropriate to use the zero-drift rate as constants are solved and zero drift corrections are made.