Linearity – Diversified Ceramics DISPLACEMENT FOLLOWER 5100 User Manual
Page 25
Displacement Follower User’s Manual
Version 1.4, April 19, 2004
IM1008
Page 23
Figure 18
6
Adjust the output gain to obtain a reading ±5 volts and record the gain setting.
7
For future reference, record the gain setting and the full-scale measurement range in the blank calibration Data
Sheet is at the end of this manual. The full-scale measurement range equals twice the distance that the calibrator
moved from Figure 17 to Figure 18 as read on the calibrator.
After this calibration, use of the same working distance in practice means that movement over the total range of
measurement will correspond to a change in output voltage of ±5 volts. Note that for a variable-focus lens, any change in
focus before or during operation would disrupt its earlier calibration.
Linearity
The ratio of target displacement to output voltage should be linear over the full-scale measurement range. See Figure 19.
Figure 19
The linearity of the system is adjusted before the unit leaves the factory, but linearity is not a requirement for the system to
work properly. If the linearity over the range of measurement is in question, you can make a simple linearity check after
calibration.