# Understanding ADIS16485 data

Question asked by TallDave on May 30, 2013
Latest reply on Jun 5, 2013 by NevadaMark

Hello NevadaMark and All,

I am having trouble understanding the data from ADIS16485 when the device is a rest.  In the following serial port monitoring the GYRO data is before dividing by 50 to convert to degree/second, and the ACCL data is before dividing by 4000 to convert to g.  I understand how {az} is hovering around 4000 (1 g) based on the following from page 13 of ADIS16485 (Rev. A) manual:

"When lying perfectly flat, as shown in Figure 19, the z-axis accelerometer output is 1 g, and the x and y accelerometers are 0 g."

But why are {gx, gy, gz, ax, ay} rarely 0, just very close to 0?

gx=7.00|gy=-2.00|gz=7.00|ax=4.00|ay=-19.00|az=4000.00|id=16485
gx=1.00|gy=0.00|gz=2.00|ax=5.00|ay=-25.00|az=3999.00|id=16485
gx=-17.00|gy=1.00|gz=4.00|ax=10.00|ay=-17.00|az=4008.00|id=16485
gx=2.00|gy=-3.00|gz=-15.00|ax=-3.00|ay=-14.00|az=4002.00|id=16485
gx=-7.00|gy=-2.00|gz=9.00|ax=7.00|ay=-11.00|az=4010.00|id=16485
gx=-15.00|gy=0.00|gz=-3.00|ax=5.00|ay=-15.00|az=3998.00|id=16485
gx=2.00|gy=1.00|gz=-2.00|ax=6.00|ay=-17.00|az=4006.00|id=16485
gx=-6.00|gy=-1.00|gz=8.00|ax=6.00|ay=-17.00|az=4005.00|id=16485
gx=-1.00|gy=2.00|gz=4.00|ax=4.00|ay=-19.00|az=4019.00|id=16485
gx=-4.00|gy=-11.00|gz=0.00|ax=-2.00|ay=-23.00|az=4006.00|id=16485
gx=-7.00|gy=-7.00|gz=6.00|ax=-3.00|ay=-23.00|az=3995.00|id=16485
gx=-3.00|gy=2.00|gz=6.00|ax=7.00|ay=-16.00|az=4004.00|id=16485
gx=8.00|gy=1.00|gz=1.00|ax=2.00|ay=-20.00|az=4003.00|id=16485
gx=-14.00|gy=-4.00|gz=-13.00|ax=2.00|ay=-20.00|az=4011.00|id=16485
gx=-10.00|gy=-10.00|gz=13.00|ax=3.00|ay=-23.00|az=4013.00|id=16485
gx=2.00|gy=-3.00|gz=18.00|ax=-4.00|ay=-19.00|az=4004.00|id=16485
gx=-5.00|gy=4.00|gz=3.00|ax=7.00|ay=-15.00|az=4004.00|id=16485
gx=1.00|gy=-6.00|gz=-1.00|ax=3.00|ay=-21.00|az=3989.00|id=16485
gx=4.00|gy=-3.00|gz=6.00|ax=1.00|ay=-20.00|az=4003.00|id=16485
gx=1.00|gy=7.00|gz=-11.00|ax=-2.00|ay=-20.00|az=4005.00|id=16485
gx=-5.00|gy=-15.00|gz=-8.00|ax=1.00|ay=-15.00|az=4017.00|id=16485
gx=-6.00|gy=8.00|gz=-12.00|ax=12.00|ay=-13.00|az=4004.00|id=16485
gx=-10.00|gy=-17.00|gz=-2.00|ax=4.00|ay=-22.00|az=4013.00|id=16485
gx=-17.00|gy=-12.00|gz=3.00|ax=-2.00|ay=-30.00|az=4007.00|id=16485
gx=1.00|gy=5.00|gz=23.00|ax=1.00|ay=-25.00|az=4008.00|id=16485
gx=-1.00|gy=1.00|gz=1.00|ax=5.00|ay=-19.00|az=4006.00|id=16485
gx=-20.00|gy=7.00|gz=-4.00|ax=1.00|ay=-13.00|az=4005.00|id=16485
gx=0.00|gy=1.00|gz=0.00|ax=0.00|ay=-14.00|az=4002.00|id=16485
gx=-5.00|gy=3.00|gz=-12.00|ax=6.00|ay=-23.00|az=3995.00|id=16485
gx=18.00|gy=1.00|gz=4.00|ax=2.00|ay=-25.00|az=4004.00|id=16485
gx=-3.00|gy=9.00|gz=6.00|ax=-11.00|ay=-22.00|az=4009.00|id=16485
gx=-12.00|gy=-10.00|gz=1.00|ax=-3.00|ay=-23.00|az=4009.00|id=16485
gx=-9.00|gy=4.00|gz=-7.00|ax=6.00|ay=-24.00|az=4008.00|id=16485
gx=-7.00|gy=-14.00|gz=-1.00|ax=10.00|ay=-26.00|az=3999.00|id=16485
gx=3.00|gy=0.00|gz=-6.00|ax=14.00|ay=-15.00|az=3997.00|id=16485
gx=-3.00|gy=4.00|gz=-3.00|ax=1.00|ay=-13.00|az=4001.00|id=16485
gx=3.00|gy=-9.00|gz=-3.00|ax=4.00|ay=-28.00|az=4003.00|id=16485
gx=7.00|gy=-10.00|gz=0.00|ax=4.00|ay=-23.00|az=4004.00|id=16485
gx=3.00|gy=-5.00|gz=4.00|ax=-8.00|ay=-12.00|az=4010.00|id=16485
gx=-10.00|gy=8.00|gz=-3.00|ax=3.00|ay=-17.00|az=4006.00|id=16485
gx=-4.00|gy=-20.00|gz=14.00|ax=4.00|ay=-15.00|az=4001.00|id=16485
gx=-15.00|gy=2.00|gz=-8.00|ax=1.00|ay=-19.00|az=4009.00|id=16485
gx=-4.00|gy=-1.00|gz=7.00|ax=2.00|ay=-20.00|az=4003.00|id=16485
gx=9.00|gy=5.00|gz=-2.00|ax=-4.00|ay=-25.00|az=4013.00|id=16485
gx=-4.00|gy=8.00|gz=10.00|ax=10.00|ay=-22.00|az=4014.00|id=16485
gx=-12.00|gy=-3.00|gz=1.00|ax=6.00|ay=-17.00|az=4015.00|id=16485
gx=-12.00|gy=4.00|gz=4.00|ax=4.00|ay=-8.00|az=3999.00|id=16485
gx=-1.00|gy=1.00|gz=10.00|ax=9.00|ay=-16.00|az=4020.00|id=16485
gx=-6.00|gy=-9.00|gz=2.00|ax=0.00|ay=-20.00|az=4000.00|id=16485
gx=-1.00|gy=-2.00|gz=4.00|ax=-1.00|ay=-24.00|az=4014.00|id=16485
gx=-6.00|gy=-14.00|gz=4.00|ax=8.00|ay=-19.00|az=3992.00|id=16485
gx=-11.00|gy=0.00|gz=-5.00|ax=10.00|ay=-18.00|az=4004.00|id=16485
gx=-1.00|gy=-9.00|gz=14.00|ax=4.00|ay=-5.00|az=4001.00|id=16485
gx=2.00|gy=-6.00|gz=-10.00|ax=8.00|ay=-11.00|az=4002.00|id=16485
gx=7.00|gy=7.00|gz=-16.00|ax=-1.00|ay=-28.00|az=4010.00|id=16485
gx=-15.00|gy=-1.00|gz=-5.00|ax=-4.00|ay=-28.00|az=4004.00|id=16485
gx=-10.00|gy=-6.00|gz=12.00|ax=3.00|ay=-28.00|az=4007.00|id=16485
gx=0.00|gy=3.00|gz=3.00|ax=-12.00|ay=-22.00|az=4008.00|id=16485
gx=-3.00|gy=-14.00|gz=2.00|ax=5.00|ay=-15.00|az=4002.00|id=16485

Thanks for any help.

--TallDave