ADIS16COM1SLASHPCBZ datasheet(20/37 Pages) AD

20 / 37 page

ADIS16000/ADIS16229

Preliminary Technical Data

Rev. PrA | Page 20 of 37

Scale Adjustment

The x_SENS registers (see Table 32 and Table 33) provide a

fine-scale adjustment function for each axis. The following

equation describes how to use measured and ideal values to

calculate the scale factor for each register in LSBs:

SCFx =









 1

× 218

where:

is the ideal x-axis value.

is the actual x-axis measurement.

These registers contain correction factors, which come from the

factory calibration process. The calibration process records

accelerometer output in four different orientations and

computes the correction factors for each register.

These registers also provide write access for in-system adjust-

ment. Gravity provides a common stimulus for this type of

correction process. Use both +1 g and −1 g orientations to reduce

the effect of offset on this measurement. In this case, the ideal

measurement is 2 g, and the measured value is the difference of

the accelerometer measurements at +1 g and −1 g orientations.

The factory-programmed values are stored in flash memory and

are restored by setting GLOB_CMD[3] = 1 (DIN = 0xB604)

(see Table 74).

Table 32. X_SENS

Pages 1-6, Low Byte Address = 0x16, Read/Write

Bits

Description (Default = N/A)

[15:0]

X-axis scale correction factor (SCFx), twos complement

Table 33. Y_SENS

Pages 1-6, Low Byte Address = 0x18, Read/Write

Bits

Description (Default = N/A)

[15:0]

Y-axis scale correction factor (SCFy), twos complement

PRE-FFT WINDOWING

REC_CTRL1[13:12] provide three options for pre-FFT windowing

of time data. For example, set REC_CTRL1[13:12] = 01 to use

the Hanning window, which offers the best amplitude resolution

of the peaks between frequency bins and minimal broadening

of peak amplitudes. The rectangular and flat top windows are

also available because they are common windowing options for

vibration monitoring. The flat top window provides accurate

amplitude resolution with a trade-off of broadening the peak

amplitudes.

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