Hioki MEMORY HiLOGGER LR8450 Instruction Manual page 380

Gage method
4-gage method
(perpendicular placement)
4-gage method
(active dummy method)
Active gage
Dummy gage
*2: Must be corrected using (2,000,000 × measured value) / (4,000,000 - 2 × measured value). The
scaling function cannot be used to perform correction. Instead, perform correction using the waveform
calculation function.
Example: True strain value if the instrument measures a strain value of 100,000 με while using the active
ε =
i
ε
ε : Strain value measured by instrument
Example waveform calculation settings
For footnote *1
W1 = (−1 ∗ U1-1) + 1M
W2 = (1M ∗ U1-1) / (1 ∗ W1)
W2 indicates the calculation result. The above calculations cannot be combined into a single
setting.
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Bridge circuit diagram
Applied voltage
Perpendicular placement
e = 2 (1 + Poisson's ratio) × ε
Active dummy method
e = 2ε
dummy (4-wire) method
(2,000,000 × ε)
(2,000,000 × 100,000)
=
(4,000,000 − 2 × ε)
(4,000,000 − 2 × 100,000)
: True strain value
i
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Perpendicular placement
This connection method cancels the effects of
temperature changes of the measurement target.
Use the scaling conversion ratio slope described
below.
1 / {2 × (1 + Poisson's ratio)}
Output
Active dummy method
voltage
This connection method is not affected by
e
temperature changes of the measurement target
or bending strain. *
E
Rg
1
200,000 × 10
=
3,800,000
Measuring Strain
Connection to U8554 or LR8534
2
Rg
4
Rg
2
Rg
3
DIP switch
ON OFF OFF
1 2
6
≈ 52632 (με)
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3