Figure 3. Connecting a Half Bridge to the NI 9237
EX+
EX-
SC
SC
RS+
RS-
AI-
AI+
NI 9237 with RJ50
EX+
EX-
SC+
RS+
RS- /SC-
AI-
AI+
NI 9237 with DSUB
You also can connect floating signals to the NI 9237. If you
connect floating signals to the NI 9237, NI recommends
connecting the EX- signal to the earth ground or shield for better
noise rejection.
Bridge Calibration
When you insert or remove a new sensor from the NI 9237, slight
changes in the excitation voltages can cause a mismatch between
the internal half-bridge completion resistors and the half-bridge
sensors, which results in a change in the measurement offsets. NI
recommends performing bridge calibrations of quarter- or half-
bridge sensors after connecting all sensors to the NI 9237 and
NI 9237 Getting Started Guide | © National Instruments | 13
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