Datasheet

SCA100T Series
VTI Technologies Oy Subject to changes 9/18
www.vti.fi Doc. nr. 8261800 Rev.A
ySensitivit
OffsetV
out
−
= α
2 Functional Description
2.1 Measuring Directions
X-axis
Y-axis
Figure 8. The measuring directions of the SCA100T
2.2 Voltage to Angle Conversion
Analog output can be transferred to angle using the following equation for conversion:
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−
=
ySensitivit
OffsetV
out
arcsin α
where: Offset = output of the device at 0° inclination position, Sensitivity is the sensitivity of the
device and V
Dout
is the output of the SCA100T. The nominal offset is 2.5 V and the sensitivity is 4
V/g for the SCA100T-D01 and 2 V/g for the SCA100T-D02.
Angles close to 0° inclination can be estimated quite accurately with straight line conversion but for
the best possible accuracy, arcsine conversion is recommended to be used. The following table
shows the angle measurement error if straight line conversion is used.
Straight line conversion equation:
Where: Sensitivity = 70mV/° with SCA100T-D01 or Sensitivity= 35mV/° with SCA100T-D02
Tilt angle [°] Straight line conversion error [°]
0 0
1 0.0027
2 0.0058
3 0.0094
4 0.0140
5 0.0198
10 0.0787
15 0.2185
30 1.668
VOUT > VOUT =2.5V > VOUT