|
(
... continued
)
When the calibration resistor is shunted across
, the resistance of the bridge arm becomes
and the change in arm resistance is:
Eq. (514.2)
Or,
Eq. (514.3)
Re-expressing the unit resistance change in terms
of strain yields a relationship between the simulated
strain and the shunt resistance required to produce
it. The result is usually written here in the form
, but the simulated strain for a particular shunt
resistance can always be calculated by inverting the
relationship.
The unit resistance change in the gage is related
to strain through the definition of the gage factor,
.
Eq.(514.4)
where
is the nominal resistance of the strain gage (e.g.,
120 ohms, 350 ohms, etc.).
In this publication, the symbol
represents the gage factor of the strain gage, while
denotes the setting of the gage factor control on a
strain indicator.
(
continued ...
)
|
Vishay Measurements Group
