SCA3000-D01 datasheet(38/43 Pages) VTI

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SCA3000 Series

VTI Technologies Oy

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Doc.Nr. 8257300A.07

Rev.A.07

8.3

Linearity

The linearity error characterization method described below is applied for those SCA3000 series

components that have measuring range ±3g or below.

Accurate input acceleration needed in linearity characterization is generated using centrifugal force

in centrifuge, see Figure 22. The RPM of the centrifuge is sweeped so that wanted input

acceleration values are applied in parallel to the sensor’s measuring axis.

Linearity error is the deviation from the straight line through sensor’s sensitivity calibration points,

see Figure 23.

Linearity error is calculated by

Equation 7

100

⋅

−

Sens

Output

LinEr

acc

axis

acc

axis

where LinErZ-axis@acc is sensor’s Z-axis linearity error [%FS] on input acceleration acc, OutputZ-axis@acc

is sensor’s measured Z-axis output [counts] on input acceleration acc, Output@acc is sensor’s

Centrifugal

acceleration

for Z-axis

Pin #1

Figure 22. Centrifugal acceleration applied for SCA3000 Z-axis.

Input acceleration [g] (centrifugal

acceleration in parallel to

SCA3000 measuring axis)

SCA3000 output at

positive sensitivity

calibration point

SCA3000 linearity

error in [g] at input

acceleration acc

+1 g

-1 g

Possible offset error is not

included into linearity error

SCA3000 output

readings

Sensor’s ideal

output

Acceleration reading

from SCA3000 [g]

acc

Figure 23. SCA3000’s linearity error at input acceleration acc.

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