Chapter 4 Connecting and Using Accessories and Transducers
© National Instruments Corporation 4-15 Getting Started with SCXI
Using Strain Gauges with the SCXI-1520
The SCXI-1520 allows you toset thevoltage excitationlevel over therange
0 to 10 V at 0.625 V resolution. To prevent the module from overheating,
the voltage should not be set greater than
(total load resistance per channel)
× (28.6 mA)
Table 4-3 shows maximum allowable excitation voltages for standard
bridge configurations and gauge resistances.
Figures 4-8, 4-9, and 4-10 show examples of quarter-bridge, half-bridge,
and full-bridge strain gauge connections, respectively, to the SCXI-1520
through the accessory SCXI-1314 terminal block. The quarter-bridge
completion resistor and shunt calibration resistors are in sockets. You can
change the quarter-bridge completion resistor to match the resistance of
your strain gauge without resoldering. Half-bridge completion is provided
inside the SCXI-1520 module. You configure the module for half-bridge
completion under software control.
Table 4-3. Excitation Voltage Ranges for Configuration and Gauge Resistances
Configuration/Sensor Resistance Excitation Voltage Range
Quarter or Half Bridge 120 Ω 0to6.250V
350 Ω 0to10V
1000 Ω 0to10V
Full Bridge or
Full-Bridge Sensor
120 Ω 0to3.125V
350 Ω 0to10V
1000 Ω 0to10V
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