The performance of vibrating MEMS gyroscopes are often presented in terms of drift, without indicating what definition of drift is used. Generally, the given figure corresponds to the lowest point of Allan variance which is the best figure for a given gyroscope. This figure allows comparing different gyros but is not really useful information about the operational performance. In fact, for a lot of applications, the most important figure is the environmentally sensitive drift rate, especially the one depending on applied mechanical vibrations.This paper analyses the origin of the mechanical vibration sensitive drift rate which is directly related to resonator manufacturing process tolerances. It presents tests results obtained with the Quapason™, a metallic vibrating gyroscope with a high (resonator volume)/(total volume) ratio. The 3D design of Quapason™ ensures relatively good insulation and the resonator is manufactured using cheap and classical machine tools which give relatively accurate precision so that the sensor has very low sensitivity to external mechanical vibrations. The sensitivity of several Quapason™ with different balancing level will be presented.
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