Agilent Technologies E1356A Spécifications Page 53

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Strain
Measurement
Equations
The equations in the instrument firmware which calculate the measured
strain are given in Table 4-1.
Strain Gage Multiplexer Block Diagrams
The manner in which strain-related signals are routed from the specimen to
the multimeter is illustrated with the block diagrams in Figure 4-1.
Figure 4-1. Strain Gage Multiplexer Block Diagrams
Arrangement Equation Parameter
1
4
Bridge
Bending
1
2
Bridge
Poisson
1
2
Bridge
Bending Full Bridge
Bending Poisson Full Bridge
Poisson Full Bridge
ε = -4Vr/GF(1 + 2Vr)
ε = -2Vr/GF
ε = -4Vr/GF[(1 + ν)-2Vr(ν −1)]
ε = -Vr/GF
ε = -2Vr/GF(ν + 1)
ε = -2Vr/GF[(ν + 1) -Vr(ν −1)]
QUARter
HBENding
HPOisson
FBENding
FBPoisson
FPOisson
ε = strain. For results in microstrain, multiply the calculated (measured)
strain by 1E-6.
NOTE: tensile strain is (+), compressive strain is (-)
Vr = [(Vout/VS)strained - (Vout/VS) unstrained]
Vout = bridge output voltage
Vs = bridge excitation voltage
GF = Gage Factor
ν = Poisson Ratio
Table 4-1. Strain Measurement Equations
52 Understanding the Strain Gage Multiplexers Chapter 4
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