Hi All, I have acceleration data from an accelerometer. I tried integrating it twice to calculate displacement. The problem is that its off. I am expecting about 1 cm peak to peak but instead getting about 5 cm peak to peak. The Matlab program we use transforms the signal from a time to frequency domain then change it back after integration. I attached a sample data set. The first column shows displacement in mm, this is the measured displacement we are trying to match. The second shows acceleration in volts. The first 3000 samples are the reading with 1 g. A change of 0.198 v causes a 1 g change. The sampling rate is 5000 Hz. I have been trying to figure this out for months with no luck. Any help would be appreciated. Thank you for your time.