Voltage; Ratiometric; Linear; Nonstandard - VTI Instruments EX1629 User Manual

The full-bridge strain conversion is calculated 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. This configuration is
illustrated in Figure 2-5.

Voltage

This simply returns the differential voltage, V
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
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
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.
EX1629 Basic Operation
V V V
diff sense - sense
V V
diff unstrained
V
r
V
excitation
2 V
r
GF 1
V V V
diff sense - sense
V V V
diff sense - sense
V V
diff unstrained
V
r
V
excitation
V V V
diff sense - sense
V GF V V
diff unstrained
.
diff
, according to:
diff
, according to:
diff
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