SCA3000 datasheet(36/43 Pages) VTI

36 / 43 page

SCA3000 Series

VTI Technologies Oy

36/ 43

www.vti.fi

Doc.Nr. 8257300A.07

Rev.A.07

Data sheet references

8.1

Offset

SCA3000's offset will be calibrated in X = 0 g, Y = 0 g, and Z = +1 g (Z measuring axis is parallel to

earth’s gravitation) position, see Figure 20.

Z-axis in +1 g

position

Earth’s

gravitation

Pin #1

Figure 20. SCA3000 offset (0 g) position.

8.1.1

Offset calibration error

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 2

1000

⋅

−

Sens

Output

Offset

axis

axisCalibE

where OutputX-axisCalibEr is sensor’s X-axis calibration error in [mg], OutputX-axis is sensor’s X-axis

output reading [counts], Output is sensor’s nominal output in 0 g position and Sens sensor’s nominal

sensitivity [counts/g].

8.1.2

Offset temperature error

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 3

1000

⋅

−

Sens

Output

Offset

axis

axisTempEr

where OutputX-axisTempEr@T is sensor’s X-axis temperature error in [mg] in temperature T, OutputX-axis@T

is sensor’s X-axis output reading [counts] in temperature T, OutputX-axis@T X-axis output reading

[counts] at room temperature RT and Sens sensor’s nominal sensitivity [counts/g]. Sensor is in 0 g

position for every measurement point.

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