To achieve the minimum bias stability for a gyro, minimum on the root Allan curve, 12 deg/hr for the ADXLS646. Does the bias need to be re-estimated/measured at the interval on the curve (about 30 sec for the 646). If this is true what number from the data sheet can I use to estimate the gyro drift without updating the bias estimate. For example if I perform a one time temperature calibration over my expected temperature range what gyro drift can I expect?

Hi Keith,

The Allan variance curve on the ADXRS646 datasheet is based on re-estimating the bias at the time intervals specified. Over what time scales are you interested in estimating the drift after your initial calibration?

Here is a related link posted by our colleague Mark that might also help.

http://ez.analog.com/message/53084#53084

Regards,

Venkat