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Static Bandwidth Testing of MEMS Sensors

2013-09-22
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Optimizing bandwidth can be a key consideration for industrial systems using MEMS accelerometers and gyroscopes. This represents a classic trade-off between accuracy (noise) and response time. While most MEMS sensor manufacturers specify typical bandwidths, it is often necessary to verify the actual bandwidth of the sensor or the entire system. Characterizing the bandwidth of accelerometers and gyroscopes typically requires the use of a shaker table or other mechanical excitation source. Accurate characterization requires a thorough understanding of the motion applied to the device under test (DUT). There are many potential sources of error that need to be managed during this process. A common source of error in mechanical bandwidth characterization is resonance. Mechanical resonance can occur for a variety of reasons, including improper maintenance of the excitation source, poor coupling of the DUT to the excitation source, and reference sensor placement. Isolating these errors is time consuming and can put critical project schedules at risk.

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