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To: brokenst0nes who wrote (74)	11/20/2012 9:30:59 PM
From: GPS Info	Respond to of 351

This is an important point: Many modern industrial gyroscopes have been restricted to one or two axes. Thus, they have had to be combined when needs called for three axes. This requires a precise 90° alignment on a PCB. Otherwise, cross-axis alignment errors propagate to the final representation of the motion. To minimize the cross-axis errors, developers must implement system-level calibration routines. In contrast, a single-chip three-axis MEMS gyroscope is calibrated during its manufacture to cancel out all cross-axis errors. This eliminates a calibration step for system integrators. Combining a two-axis gyro with a single-axis gyro creates a misalignment error source that could be very difficult to remove. The same is true when combining a 3-axis gyro and and 3-axis accelerometer or a 3-axis magnetometer. This misalignment between the sensors makes the dynamic equations much harder to model. This is why a combo chip will be much better than two separate chips on the PCB -- the manufacturing process minimizes the cross-axis errors.