SCA3000 Series
Y
Centrifugal
acceleration
for Z-axis
Z
X
Pin #1
Figure 22. Centrifugal acceleration applied for SCA3000 Z-axis.
Linearity error is the deviation from the straight line through sensor’s sensitivity calibration points,
see Figure 23.
Acceleration reading
from SCA3000 [g]
SCA3000 linearity
error in [g] at input
acceleration acc
SCA3000 output at
positive sensitivity
calibration point
-1 g
acc
+1 g
Input acceleration [g] (centrifugal
acceleration in parallel to
Sensor’s ideal
output
SCA3000 measuring axis)
SCA3000 output
readings
Possible offset error is not
included into linearity error
Figure 23. SCA3000’s linearity error at input acceleration acc.
Linearity error is calculated by
Equation 7
OutputZ−axis @ acc −Output@ acc
LinErZ−axis @ acc
=
⋅100%
,
Sens⋅ FS
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
nominal output [counts] on input acceleration acc, Sens is sensor’s nominal sensitivity [counts/g] and
FS is sensor’s full scale measuring range [g] (for example for SCA3000-D01 ±2g → FS = 2 g).
Sensor’s ideal output Output@acc (in Equation 7) is calculated from the straight line through
sensitivity calibration points (the red straight line in Figure 23). Nominal output is calculated by
Equation 8
Output+1g − Output−1g
2g
Output+1g − Output−1g Output+1g + Output−1g
Output@ acc = acc⋅
+ offset = acc⋅
+
,
2g
2
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