Basic bipolar calibration method, Alternate bipolar calibration – Kaman SMU9200 User Manual
Page 18
SMU-9000 User Manual
15
••••
Part III: Calibration
Basic Bipolar Calibration Method
1.
Position the target at the minimum displacement from the
sensor. Adjust the “Zero” control until the system output
voltage reads the negative output voltage desired.
2.
Position the target at the maximum displacement from the
sensor. Make note of the actual output voltage reading. (The
output voltage at this point will probably be greater than the
desired full-scale output voltage).
3.
Adjust the “Gain” control until the difference between the
actual reading and desired reading is halved. For example, if
the actual output reading was +6.000 Vdc and the desired
reading was +5.000 Vdc, the “Gain” control would be
adjusted to produce an output that is halfway to the desired
output voltage or + 5.500 Vdc in this case. After several
iterations, the actual output voltage reading will be closer to
the desired reading.
4.
Repeat steps 1 to 2 until the system is calibrated.
Alternate Bipolar Calibration
1.
Position the target at the mechanical middle or mid-point of
the measuring range and adjust the “Zero” control until the
output voltage reads 0 Vdc. Further adjustment of the “Zero”
control should not be necessary.
2.
Position the target at the minimum displacement from the
sensor. Adjust the “Gain” control to read the desired negative
output voltage.
3.
Position the target at the maximum displacement from the
sensor and make a note of the actual output voltage reading.
4.
Adjust the “Gain” control until the difference between the
actual reading and the desired reading is halved. For example,
if the actual output voltage reading was +2.400 Vdc at
maximum displacement and the desired reading was +2.500
Vdc, the “Gain” control would be adjusted to produce an
output that is halfway to the desired output voltage or +2.450
Vdc in this case.
5.
The difference (absolute value) between the actual and the
desired output voltage readings at each end point will be
approximately equal. Using the previous example, the output
voltage would read -2.550 Vdc at minimum displacement;
0Vdc at mid-point; and +2.450 Vdc at maximum
displacement.
6.
System calibration should be complete at this point