NI 9237 Operating Instructions and Specifications
8
ni.com
The NI 9237 has a fo
u
r-terminal external excitation voltage so
u
rce
connector. Yo
u
can
u
se the EX+ and EX– terminals on the
connector to connect one external excitation voltage so
u
rce to the
mod
u
le. Yo
u
can
u
se the additional EX+ and EX– terminals on the
connector to wire m
u
ltiple NI 9237 mod
u
les together in a daisy
chain.
Note
When yo
u
insert or remove a new sensor from the
NI 9237, slight changes in the excitation voltages can
ca
u
se a mismatch between the internal half-bridge
completion resistors and the half-bridge sensors, which
res
u
lts in a change in the meas
u
rement offsets.
National Instr
u
ments recommends performing bridge
calibrations of q
u
arter- or half-bridge sensors after
connecting all sensors to the NI 9237 and after removing
or attaching any additional sensor. Visit
ni.com/info
and enter the info code
rdw9237
for more information
abo
u
t changes in voltage offsets in the NI 9237.
