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for lead wire resistance. Refer to Figure 9 for an illustration of the 
connections.

Figure 9.  Connections in 2-Wire Resistance and Quarter-Bridge Modes

Half-Bridge and Full-Bridge modes use the internal voltage 
excitation to set the input range of the ADC and return voltage 
readings that are proportional to the excitation level. The internal 
excitation voltage is nominally 2.5 V but it varies based on the 
resistance of the sensor. Refer to the 

 section for 

more information about excitation levels.

In Half-Bridge mode, the HI input is referenced to EX–. 
In Full-Bridge mode, the ADC reads the HI and LO inputs 
differentially. Refer to Figure 10 for an illustration of the 
connections.

LO

R

Wire

Wire

I

ADC

I

HI

NI 9219