CMA3000-D0X VTI Hamlin, CMA3000-D0X Datasheet - Page 29

• Manufacturer Part Number: CMA3000-D0X
• Description: Cma3000-d0x Series 3-axis Accelerometer
• Manufacturer: VTI Hamlin

8.5 Bandwidth
8.6 Cross-axis sensitivity
VTI Technologies Oy
www.vti.fi
Equation 7
where n is sensor’s noise [g] per axis, n
and n
CMA3000 demo-kit design can be used as a reference design for noise measurements, refer to
“CMA3000 DEMO KIT User Manual 8288400”.
Signal bandwidth is measured in a shaker by sweeping the piston movement frequency with
constant amplitude (Figure 22).
Cross-axis sensitivity is sum of the alignment and the inherent sensitivity errors. Cross-axis
sensitivity of one axis is a geometric sum of the sensitivities in two perpendicular directions.
Cross-axis sensitivity [%] of X-axis is given by
Equation 8
where S
acceleration [Count/g] and S
Cross-axis sensitivity [%] of Y-axis is given by
Equation 9
where S
acceleration [Count/g] and S
Cross-axis sensitivity [%] of Z-axis is given by
Cross
Cross
n
Figure 22. CMA3000 movement in Z-axis bandwidth measurement.
Pin #1
=
Z
1
3
Y
X
is sensor’s Z-axis noise [g].
(
XY
YX
=
n
=
X
2
±
is X-axis sensitivity to Y-axis acceleration [Count/g], S
is Y-axis sensitivity to X-axis acceleration [Count/g], S
±
+
Y
n
S
S
Y
2
YX
XY
+
2
S
S
2
n
+
Y
Z
+
X
Z
2
S
)
S
YZ
,
XZ
Doc.Nr. 8281000.12
2
X
2
⋅
100
⋅
X
Y
100
is sensitivity of Y-axis [Count/g].
is sensitivity of X-axis [Count/g].
%,
%,
X
is sensor’s X-axis noise [g], n
Shaker
movement
in parallel
to Z-axis
Earth’s
gravitation
XZ
YZ
is X-axis sensitivity to Z-axis
is Y-axis sensitivity to Z-axis
Y
is sensor’s Y-axis noise [g]
CMA3000-D0X Series
Rev. 0.12
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