VXI VT1422A - Manual (Page 95)

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 93 Chapter 3
Error Analysis
Figure 3-21 compares the non-linear quarter bridge equation used for strain
SCPs with the linear approximation used with the VT1529A/B. Notice that
while the error is independent of excitation voltage and unstrained voltage,
error is quite sensitive to gage factor.
Figure 3-21. Error of Quarter Bridge Linear Approximation
Error vs Delta Strain
-1000
0
1000
2000
3000
4000
5000
6000
-100000 -80000 -60000 -40000 -20000 0 20000 40000 60000 80000 100000
Delta Strain in m icrostrain (µ ε)
Error in microstrain (µ
ε)
GF=1
GF=2
GF=5