NI 9237 Operating Instructions and Specifications
10
ni.com
Each channel on the NI 9237 has an independent 24-bit ADC
and an inp
u
t amplifier that enable yo
u
to sample signals from all
fo
u
r channels sim
u
ltaneo
u
sly.
The NI 9237 is isolated from earth gro
u
nd. However, the individ
u
al
channels are not isolated from each other. The EX+, EX–, and
T– signals are common among all channels. Yo
u
can connect the
NI 9237 to a device that is biased at any voltage within the NI 9237
rejection range of earth gro
u
nd. Refer to the
section
for more information abo
u
t the common-mode rejection
ratio (CMRR).
Yo
u
also can connect floating signals to the NI 9237. If yo
u
connect floating signals to the NI 9237, National Instr
u
ments
recommends connecting the EX– signal to the earth gro
u
nd or
shield for better noise rejection.
The NI 9237 also incl
u
des filters to prevent aliasing. The filters
on the NI 9237 filter according to the data rate. Refer to the
Understanding NI 9237 Filtering
section for more information
abo
u
t filtering.
