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NI 9237 Operating Instructions and Specifications 10 ni.com
Each channel on the NI 9237 has an independent 24-bit ADC
and an input amplifier that enable you to sample signals from all
four channels simultaneously.
The NI 9237 is isolated from earth ground. However, the individual
channels are not isolated from each other. The EX+, EX–, and
T– signals are common among all channels. You can connect the
NI 9237 to a device that is biased at any voltage within the NI 9237
rejection range of earth ground. Refer to the Specifications section
for more information about the common-mode rejection
ratio (CMRR).
Yo u also can connect floating signals to the NI 9237. If you
connect floating signals to the NI 9237, National Instruments
recommends connecting the EX– signal to the earth ground or
shield for better noise rejection.
The NI 9237 also includes 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
about filtering.