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Originally Posted by bush
I didn't completely understand what the mV/g meant in the data sheet
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You have it correct. Remember that calibration is not perfect, so you may be off by a few counts. A good source of gravity is the earth: When the sensor is pointing "down" it will measure 1 g (1 gravity).
mV/g refers to the number of millivolts (1/1000 of a volt) for each "g" sensed("g" stands for gravity, the normal force experienced by the pull of the earth at sea level, an acceleration of around 9.8 meters per second per second (m/s2), or abour 32 feet per second per second.)
So, if a sensor gives out 125 mV/g, at 1 gravity you can expect to see 125 millivolts.
Hope that helps, & good luck
Don