IMU-3000 offset values

Hi,

I'm evaluating an IMU-3000 gyro (breakout board from sparkfun).

The spec says the values in gyro offsets registers are subtracted from the sensor values before going into the sensor registers. So, I put the sensor in a stationary state, set 0's to the offsets registers and read the sensor registers several times. The values had some biases. Then I stored the average of these values into the offsets registers and read the sensor registers again. I expected the values very close to zero, but the actual values were far from zero. they were several times larger (or smaller) than the offsets registers values.

Any suggestions?

Hiroshi