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SCA61T Datasheet(PDF) 9 Page - VTI technologies |
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SCA61T Datasheet(HTML) 9 Page - VTI technologies |
9 / 18 page SCA61T Series VTI Technologies Oy Subject to changes 9/18 www.vti.fi Doc. nr. 8261900 Rev.A y Sensitivit Offset V out − = α 2 Functional Description 2.1 Measuring Directions X-axis Figure 8. The measuring direction of the SCA61T 2.2 Voltage to Angle Conversion Analog output can be transferred to angle using the following equation for conversion: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − = y Sensitivit Offset V out arcsin α where: Offset = output of the device at 0° inclination position, Sensitivity is the sensitivity of the device and VDout is the output of SCA61T. The nominal offset is 2.5 V and the sensitivity is 4 V/g with SCA61T-FAHH1G and 2 V/g with SCA61T-FA1H1G. Angles close to 0° inclination can be estimated quite accurately with straight line conversion but for 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 SCA61T-FAHH1G or Sensitivity= 35mV/° with SCA61T-FA1H1G 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 2.3 Ratiometric Output Ratiometric output means that zero offset point and sensitivity of the sensor are proportional to the supply voltage. If the SCA61T supply voltage is fluctuating, the SCA61T output will also vary. When the same reference voltage for both the SCA61T sensor and the measuring part (A/D- converter) is used, the error caused by reference voltage variation is automatically compensated for. VOUT > VOUT =2.5V > VOUT |
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