MEMS gyro vibration immunity and its measurement with TIRA shaker

This paper presents test results on vibration and shock immunity of MEMS gyroscope conducted with shakers TIRAvib 5222 and TYRA TV57315/LS. Due to exciter angular vibrations at low frequencies working range for gyro vibration testing begins from 200Hz. To check the shaker work B&K accelerometers and vibration immunity gyro ADXRS450 were used. Such elements of accessories as adapter for shaker, holding jig for mounting printed circuit board (PCB) with gyro, the PCB thickness may strongly influence on the testing results. The best result has been obtained with the use of steel circle of a small diameter as adapter for shaker and 2mm aluminum base for PCB. The test confirms an absence of false signals at the vibration frequencies less than 2kHz in the new modification of gyro with increased suspension resonant frequency. The gyro quadrature cancellation electrode system behaviour under vibration conditions was analyzed with the use of quasi-electric field strength control.