Parameters You need to Know When Selecting a MEMS Accelerome

[Alisha Bridges]

When selecting an accelerometer for a given application, it is important to consider some of its key characteristics:



· Bandwidth (Hz): the bandwidth of a sensor indicates the range of vibration frequencies to which the accelerometer responds or how often a reliable reading can be taken. Humans cannot create body motion much beyond the range of 10Hz to12Hz. For this reason, a bandwidth of 40Hz to 60Hz is adequate for sensing a tilt or human motion.



· Sensitivity (mV/g or LSB/g): sensitivity is a measure of the minimum detectable signal or the change in output electrical signal per change in input mechanical change. This is valid in one frequency only.



· Voltage noise density (µg/SQRT Hz): voltage noise changes with the inverse square root of the bandwidth. The faster that we read accelerometer changes, the worse accuracy we get. Noise has a higher influence on the performance of the accelerometers when operating at lower g conditions with a smaller output signal.



· Zero-g voltage: this term specifies the range of voltages that can be expected at the output under 0g of acceleration.



· Frequency response (Hz): this is the frequency range specified with a tolerance band (±5%, etc) for which the sensor will detect motion and report a true output. The specified band tolerance lets the user calculate how much the device’s sensitivity deviates from the reference sensitivity at any frequency within its specified frequency range.



· Dynamic range (g): this is the range between the smallest detectable amplitude that the accelerometer can measure to the largest amplitude before distorting or clipping the output signal.



Ericco offers the ER-MA-5 series of high-accuracy MEMS accelerometers, as shown in the picture. These accelerometers feature a compact size, lightweight design, and low power consumption. They are ideal for a wide range of applications, including vibration detection, attitude control, security alarms, consumer electronics, motion recognition, and status recording.



For more details, contact ERICCO INERTIAL SYSTEM via:



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