sca3000-e05pwb VTI Hamlin, sca3000-e05pwb Datasheet - Page 38

• Manufacturer Part Number: sca3000-e05pwb
• Description: Sca3000 Series 3-axis Accelerometer
• Manufacturer: VTI Hamlin

8.3 Linearity
VTI Technologies Oy
www.vti.fi
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
where LinEr
is sensor’s measured Z-axis output [counts] on input acceleration acc, Output
LinEr
Figure 22. Centrifugal acceleration applied for SCA3000 Z-axis.
Figure 23. SCA3000’s linearity error at input acceleration acc.
Sensor’s ideal
output
Z
Z
−
SCA3000 output at
axis
positive sensitivity
calibration point
@
Z-axis@acc
SCA3000 output
readings
acc
Y
=
X
-1 g
Output
is sensor’s Z-axis linearity error [%FS] on input acceleration acc, Output
Pin #1
Doc.Nr. 8257300A.07
Z
−
axis
Sens
Acceleration reading
from SCA3000 [g]
@
acc
⋅
−
FS
Output
+1 g
Centrifugal
acceleration
for Z-axis
acc
@
acc
Input acceleration [g] (centrifugal
acceleration in parallel to
SCA3000 measuring axis)
Possible offset error is not
included into linearity error
⋅
100
%
,
SCA3000 linearity
error in [g] at input
acceleration acc
@acc
SCA3000 Series
is sensor’s
Z-axis@acc
Rev.A.07
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