National Instruments NI 9236 - Manual (Page 10)

NI 9235/9236 10 ni.com
NI 9235/9236 Circuitry
The NI 9235/9236 is isolated from earth ground. However, the
individual channels are not isolated from each other. The EXC
terminals all connect internally to a common excitation supply.
You must connect each EXC terminal to only one gage to maintain
the channel-to-channel crosstalk performance of the module.
Each channel on the NI 9235/9236 has an independent 24-bit ADC
and input amplifier that enables you to sample signals from all
eight channels simultaneously. Refer to Figures 5 and 6 for
illustrations of the input circuitry for one channel of the
NI 9235/9236.