NI 9219E Operating Instructions and Specifications
16
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Half-Bridge and Full-Bridge Modes
In Half-Bridge mode, the HI input is referenced to EX–.
In Full-Bridge mode, the ADC reads the HI and LO inputs
differentially. Both 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 varies based on the resistance of the sensor. Refer to the
Specifications
section for more information about excitation levels.
Figure 11.
Connections in Half-Bridge and Full-Bridge Modes
1
The dotted line repre
s
ent
s
the portion of the circ
u
it th
a
t i
s
connected
only in F
u
ll-Bridge mode.
HI
LO
EX+
EX–
NI 9219E
R
1
R
2
R
3
R
4
ADC
Wire
Wire
1
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