Accelerometer accuracy

Hello,

I am using MPU 9150. I use the raw data logger to evaluate the accelerometer functionality. After a simple test I am concerned about the sensor accuracy.

Output example (standing object):

Time A_X A_Y A_Z
1628 304 242 16068
1633 150 180 16042
1638 198 234 16048
1643 244 322 16002
1648 282 202 16060
1653 182 204 16020
1658 174 190 16058
1663 268 276 16072
1668 316 242 16016
1673 164 202 16002
1679 150 166 16082
1684 194 236 15936
1688 324 194 15884
1693 184 240 15980
1698 150 182 16048
1703 238 250 16100
1708 330 244 16068
1714 170 212 16058
1718 174 188 16046
1723 168 214 16040
1728 230 206 16012
1733 266 268 16132

On A_Z we can see a 200 value change. I assume this is the ADC output (16 bit ADC; 15 bit resolution for positive acceleration; that means 32768 max output; Since the scale is set at 2g; 16000 is about half, which sounds about right since 1g is expected from standing object)

If the values change within 200 range, it means that my actual resolution drops from 16 bit to around 8-9. (about 0.012g; 333 real values on full scale)

Is this the accuracy of the accelerometer?

Thank you,
Calin