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help a rookie out

Question asked by robcornish on Mar 27, 2014
Latest reply on Apr 3, 2014 by robcornish

Hey guys,

 

I recently purchased an accelerometer and data acquisition module to do some shock testing. I am looking to find the largest g force an object sees when I drop it. Links to my accelerometer and DAQ are below.

 

When I hook everything up (operating at 5V supply), my accelerometer reads an average voltage of about 2.34 V. After a drop I can save all my data points into a .csv file and then find the maximum and minimum values, but they are still voltages. According to the data sheet of the accelerometer, it has a sensitivity of 24.2 mV/g. To convert this into g's do we need to just divide the voltage by .0242 or is there more to it than this?

 

I also noticed that our average voltage reading when the accelerometer is resting is around 2.34V. Would this mean that to get the g's of our impact we would first want to take the difference of the reading at that point and the average, and then divide by the sensitivity?

 

accelerometer data sheet: http://www.analog.com/static/imported-files/data_sheets/ADXL001.pdf

DAQ: http://www.mccdaq.com/usb-data-acquisition/USB-1608GX-2AO.aspx

 

Thanks in advance,

Rob

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