Measuring Strain; Tension And Compression On A Single Axis - Hioki MEMORY HiLOGGER LR8450 Instruction Manual

Measuring Strain

11.2 Measuring Strain
For information about the connection of strain gages see "Connecting a strain gage or converter" in the
Quick Start Manual. .

Tension and compression on a single axis

Gage method
1-gage method (2-wire)*
1-gage method (3-wire)*
2-gage method
(adjacent side)
(active dummy method)*
Active gage
Dummy gage
*1: Must be corrected using (1,000,000 × measured value) / (1,000,000 - 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 50,000 με while using the
ε =
i
: True strain value
ε
i
ε : Strain value measured by instrument
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Bridge circuit diagram
1
Applied voltage
E
e = ε (ε: Strain)
1
Applied voltage
E
e = ε (ε: Strain)
1
Applied voltage
E
e = ε (ε: Strain)
1-gage/2-wire method
(1,000,000 × ε)
(1,000,000 × 50,000)
=
(1,000,000 − ε) (1,000,000 − 50,000)
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Connection to U8554 or LR8534
This is the most typical connection method
Output
voltage
Rg
e
This connection method cancels the effects of
Output temperature on the strain gage wiring.
voltage
e
Rg
In this connection method, a reference strain
Output
gage is affixed to a specimen made of the same
voltage
material as the measurement target that is
e
not being subjected to stress. Apparent strain
resulting from temperature changes is measured
using the reference gage and canceled out.
Rg Rg
1
50,000 × 10
6
≈ 52632 (με)
=
950,000
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DIP switch
OFF ON ON
1 2 3
DIP switch
OFF ON OFF
1 2 3
2
DIP switch
ON ON OFF
1 2 3
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