7
4. DATA REDUCTION
4.1 Tilt Calculation
The output of the MEMS Sensor is proportional to the sine of the angle of inclination from the
zero position. For the 15 degree MEMS sensor the full-scale output is approximately four volts.
The reading (R) in volts displayed on the RB-500 readout box, and the inclination, (
θ
) is given
by the equation:
θ
= G
tilt
(R
1
-R
zero
) degrees
Equation 1 - Inclination
Where;
R is the current reading in volts.
R
zero
is the reading at
θ
= zero.
G
tilt
is the Gage Factor shown on the suppled calibration report (A typical 6165 calibration report
is shown in Appendix C.)
Note that for measurements of tilt, i.e., changes of inclination, where R
0
is the initial reading and
R
1
is a subsequent reading, the small zero reading (R
zero
) at zero inclination cancels out, so that:
Calculated Tilt (T) = G
tilt
(R
1
-R
0
) degrees
Equation 2 - Calculated Tilt
4.2 Displacement Calculation
To calculate the vertical or horizontal displacement (D) of one end of the beam relative to the
other use the equation:
Calculated Displacement (D) = G
sinθ
L(R
1
-R
0
) mm(inches)
Equation 3 - Calculated Displacement
Where;
L is length of the beam in mm or inches
G
sinθ
is the calibration factor in sinθ/volt as shown on the calibration report.
Summary of Contents for 6165
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Page 18: ...12 APPENDIX C SAMPLE CALIBRATION REPORT Figure 6 Sample Model 6165 Calibration Report ...
