Noise And Root Allan Variance Panel - Analog Devices EVAL-ADXRS450Z-M User Manual

UG-260

NOISE AND ROOT ALLAN VARIANCE PANEL

The software GUI includes the ability to calculate and plot the
root Allan variance (RAV) and the rms noise of the ADXRS450/
ADXRS453.
Root Allan variance can be approximately described as the
variation of successive long-term averages of the null output of
the ADXRS450/ADXRS453. This is usually reported in units of
degrees per hour and indicates the long-term bias stability of a
gyroscope. To generate an accurate root Allan variance plot, it is
recommended that this test be run (at least) overnight, during
which time care should be taken to ensure that the device is in a
temperature-stable, and disturbance-free environment. Any
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Figure 21. Noise and Root Allan Variance Panel
rotational rate input into the gyroscope can greatly degrade the
validity of the resulting RAV plot.
Determining the rms noise of the
be done on this same panel. The evaluation GUI calculates the
rms noise by taking the standard deviation of the specified
number of points, which is roughly equivalent to the 1-sigma
peak-to-peak noise value. These data points are obtained at a
500 Hz data rate. It is recommended that you perform this test
with at least 16,000 data points to obtain accurate results. Fewer
data points can be used, but the reported rms noise is then
subject to higher variability.
Rev. 0 | Page 12 of 20
Evaluation Board User Guide
ADXRS450/ADXRS453 can