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National Instruments Corp.
9
NI 9237E Operating Instructions and Specifications
Each channel on the NI 9237E has an independent 24-bit ADC
and an input amplifier that enable you to sample signals from all
four channels simultaneously.
The NI 9237E 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 9237E to a device that is biased at any voltage
within the NI 9237E rejection range of earth ground. Refer to the
section for more information about the
common-mode rejection ratio (CMRR).
You also can connect floating signals to the NI 9237E. If you
connect floating signals to the NI 9237E, National Instruments
recommends connecting the EX– signal to the earth ground or
shield for better noise rejection.
The NI 9237E also includes filters to prevent aliasing. The filters
on the NI 9237E filter according to the data rate. Refer to the
Understanding NI 9237E Filtering
section for more information
about filtering.