CMR3000-D0X VTI Hamlin, CMR3000-D0X Datasheet - Page 22

• Manufacturer Part Number: CMR3000-D0X
• Description: Cmr3000-d0x Block Diagram With Digital Spi And I 2 C Interface
• Manufacturer: VTI Hamlin

7
7.1 Offset
7.1.1
7.1.2 Offset temperature error
7.2 Sensitivity
7.2.1
VTI Technologies Oy
Myllynkivenkuja 6
P.O. Box 27
FI-01621 Vantaa
www.vti.fi
Data sheet references
Offset calibration error
Sensitivity calibration error
CMR3000's offset will be calibrated in Ω
Offset calibration error is the difference between the sensor's actual output reading and the nominal
output reading in calibration conditions. Error is calculated by
Equation 1
where Output
output reading [counts], Output is sensor’s nominal output in 0 dps angular rate and Sens sensor’s
nominal sensitivity [counts/dps].
Offset temperature error is the difference between the sensor's output reading in different
temperatures and the sensor’s calibrated offset value at room temperature. Error is calculated by
Equation 2
where Output
is sensor’s X-axis output reading [counts] in temperature T, Output
[counts] at room temperature RT and Sens sensor’s nominal sensitivity [counts/g]. Sensor’s angular
rate is 0 dps for every measurement point.
During the sensitivity calibration, sensor is rotated in sensing directions (Figure 11) at ±Ω dps rate.
Sensitivity is calculated by
Equation 3
where Sens
reading [counts] in +Ω dps angular rate and Output
in -Ω dps angular rate.
Sensitivity calibration error is the difference between sensor’s measured sensitivity and the nominal
sensitivity at room temperature conditions. Error is calculated by
Equation 4
Offset
Offset
Sens
Sens
Y
Y
−
−
X
X
axis
axisCalibE
−
−
axisCalibE
axisTempEr
=
Y-axis
X-axisTempEr@T
Output
X-axisCalibEr
r
is sensor’s Y-axis sensitivity in [counts/dps], Output
=
r
@
=
T
Sens
Output
=
Y
−
axis
Output
is sensor’s X-axis calibration error in [dps], Output
Doc.Nr. 82112900.A.02
Y
−
is sensor’s X-axis temperature error in [dps] in temperature T, Output
Sens
axis
@
+
X
Ω
−
−
2
Sens
axis
−
Ω
X
Sens
−
Output
axis
−
Output
@
⋅
T
100
Sens
−
Y
X
−
Output
%
= Ω
axis
,
,
@
Y
−
= Ω
Ω
X
,
−
Y-axis@-Ω
Z
axis
= 0 dps.
@
RT
is sensor’s Y-axis output reading [counts]
,
Y-axis@+Ω
X-axis@T
X-axis
sensor’s Y-axis output
X-axis output reading
is sensor’s X-axis
CMR3000-D0X Series
Rev. A.02
X-axis@T
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