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EX1629 Basic Operation 47
The full-bridge strain conversion is calculated according to:
excitation
unstraineddiff
V
VV
V
r
Setting this conversion automatically configures the input path for full-bridge mode, in which the
completion resistor is shorted and the back-half resistors are disconnected. This configuration is
illustrated in Figure 2-5.
Voltage
This simply returns the differential voltage, V
diff
.
Setting this conversion automatically configures the input path for full-bridge mode, in which the
completion resistor is shorted and the back-half resistors are disconnected. This configuration is
illustrated in Figure 2-6.
Ratiometric
This performs a scaling of the differential voltage, V
diff
, according to:
excitation
unstraineddiff
V
VV
V
r
Setting this conversion automatically configures the input path for full-bridge mode, in which the
completion resistor is shorted and the back-half resistors are disconnected.
Linear
This performs a scaling of the differential voltage, V
diff
, according to:
Setting this conversion automatically configures the input path for full-bridge mode, in which the
completion resistor is shorted and the back-half resistors are disconnected.
Nonstandard
As previously mentioned, there are potentially desirable configurations that are not covered by the
standard conversions. An example of this is a quarter-bridge configuration that provides voltage
output instead of strain. Fortunately, the EX1629 provides the flexibility to create virtually any
bridge measurement configuration. Creating a nonstandard EU conversion begins by selecting the
standard conversion that provides the desired conversion equation. Following that, the nominal
settings of the completion resistor and input multiplexer can be changed to fit the requirements of
the application.
The default selection is voltage.
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