The eigenfrequency of a resonator plays a significant role in the operation of a cylindrical shell vibrating gyroscope. and trimming is aimed at eliminating the frequency split that is the difference of eigenfrequency between two work modes. In this paper. the effects on eigenfrequency under resonator-top trimming methods that trim the top of the resonator wall are investigated by sim... https://www.roneverhart.com/Doorking-2334-080-VoIP-RS-232-Control-Box-for-1830-Series/