SCA3000-D01 datasheet(39/43 Pages) VTI

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SCA3000 Series

VTI Technologies Oy

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Doc.Nr. 8257300A.07

Rev.A.07

nominal output [counts] on input acceleration acc, Sens is sensor’s nominal sensitivity [counts/g] and

FS is sensor’s full scale measuring range [g] (for example for SCA3000-D01 ±2g

→ FS = 2 g).

Sensor’s ideal output Output@acc (in Equation 7) is calculated from the straight line through

sensitivity calibration points (the red straight line in Figure 23). Nominal output is calculated by

Equation 8

acc

Output

acc

offset

Output

acc

Output

−

⋅

−

⋅

where Output@acc is sensor’s nominal output [counts] with input acceleration acc in [g], Output+1g is

sensor’s measured output [counts] at +1 g input acceleration and Output-1g is sensor’s measured

output at -1 g input acceleration. Possible offset term [counts] is included into nominal output,

because it is not included in to linearity error.

8.4

Noise

Output noise nX, nY and nZ in X,Y and Z directions is the measured standard deviation of the output

values when the sensor is in 0 g position at room temperature. Average noise/axis is calculated by

Equation 9

()2

where n is sensor’s noise [g] per axis, nX is sensor’s X-axis noise [g], nY is sensor’s Y-axis noise [g]

and nZ is sensor’s Z-axis noise [g].

SCA3000 demo-kit design can be used as a reference design for noise measurements, refer to

“SCA3000 DEMO KIT User Manual 8259300”.

8.5

Bandwidth

Signal bandwidth is measured in a shaker by sweeping the piston movement frequency with

constant amplitude (Figure 24).

Earth’s

gravitation

Shaker

movement

in parallel

to Z-axis

Pin #1

Figure 24. SCA3000 movement in Z-axis bandwidth measurement.

8.6

Cross-axis sensitivity

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

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