SCA3000-D01 datasheet(37/43 Pages) VTI

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SCA3000 Series

VTI Technologies Oy

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Doc.Nr. 8257300A.07

Rev.A.07

8.2

Sensitivity

During sensitivity calibration, the sensor is placed in ±1 g positions having one of the sensor’s

measuring axis at a time parallel to the earth’s gravitation, see Figure 21.

Sensitivity is calculated by

Equation 4

Output

Sens

axis

−

where SensY-axis is sensor’s Y-axis sensitivity in [counts/g], OutputY-axis@+1g sensor’s Y-axis output

reading [counts] in +1 g position and OutputY-axis@-1g is sensor’s Y-axis output reading [counts] in -1 g

position.

Pin #1

Y-axis in +1 g

position

Y-axis in -1 g

position

Earth’s

gravitation

Pin #1

Figure 21. SCA3000 positions for Y-axis sensitivity measurement.

8.2.1

Sensitivity calibration error

Sensitivity calibration error is the difference between sensor’s measured sensitivity and the nominal

sensitivity at room temperature conditions. Error is calculated by

Equation 5

100

⋅

−

Sens

axis

axisCalibE

where SensY-axisCalibEr is sensor’s Y-axis sensitivity calibration error in [%], SensY-axis sensor’s Y-axis

sensitivity [counts/g] at room temperature conditions and Sens is sensor’s nominal sensitivity

[counts/g].

8.2.2

Sensitivity temperature error

Sensitivity temperature error is the difference between sensor’s sensitivity at different temperatures

and the calibrated sensitivity. Error is calculated by

Equation 6

100

⋅

−

axis

axisTempEr

Sens

where SensY-axisTempEr@T is sensor’s Y-axis sensitivity temperature error in [%] in temperature T, SensY-

axis@T is sensor’s measured Y-axis sensitivity [counts/g] at temperature T and SensY-axis@RT is sensor’s

measured Y-axis sensitivity [counts/g] at room temperature RT.

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