Hioki LR8450, Instruction Manual

Page: 275 / 310

272
Measuring Strain
Torsional stress
Gage method Bridge circuit diagram Output Remarks
2-gage method
(adjacent side)
(torsion strain)
Applied voltage
E
Output
voltage
e
e = 2
ε
When measuring strain in the
rotational direction, two strain
gages are offset so that they
intersect at an angle of 90°. Use
a scaling conversion ratio slope
of 1/2.
4-gage method
(torsion strain)
Applied voltage
E
Output
voltage
e
e = 4
ε
This connection method is not
affected by temperature changes
of the measurement target or
tension/compression/bending
strain. Use a scaling conversion
ratio slope of 1/4.
Even in measurements that are affected by temperature, you can compensate for temperature
by using a self-temperature-compensated strain gage. Longer wires are more susceptible
to the effects of temperature. Long wiring runs make lead wires susceptible to the effects of
temperature. You can make measurements with a high degree of precision by using wireless
modules to shorten wiring lengths.
For information about self temperature-compensated strain gages, contact your strain gage’s
manufacturer.