MTS Axial Extensometers - Manual (Page 43)

Calibration 43
and calculate the new conditioner output value for the
displacement. For example, suppose the calibration block is set
for 7.94 mm. Then your desired output would be 7.94 V.
The following table shows the proper conditioner output for each
extensometer displacement of the preceding example.
.
How to Use a Vernier Caliper
This method requires a tool such as vernier caliper, micrometer, or other
precision measuring device. Use this procedure as a guideline to adjust
the gain for other sensors that can use the DC conditioner.
Note This is not the most accurate method, but may be used
depending upon your needs.
1. Set up the controller.
Your test controller must be configured to use the extensometer
signal.
A. Connect the extensometer to your controller.
B. Monitor the excitation voltage.
C. Monitor the extensometer signal.
% F ULL S CALE A CTUAL D ISPLACEMENT O UTPUT
100% 10 mm +10 V
80% 8 mm +8 V
60% 6 mm +6 V
40% 4 mm +4 V
20% 2 mm +2 V
Zero 0 mm 0 V
-20% -2 mm -2 V
Adjust gain/ ΔK for ±80% travel of a symmetrical extensometer.
Adjust gain for 80% or maximum negative travel (whichever is
greater) and
ΔK for 80% of positive travel of an asymmetrical
extensometer.