Agilent Technologies E1356A Dokumentacja Pobierz pdf (Strona 53)

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

⁄

Bridge

Bending

⁄

Bridge

Poisson

⁄

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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