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© National Instruments Corp. 7 NI 9225E Operating Instructions and Specifications
The NI 9225E analog input channels are floating with respect to
earth ground and each other. The incoming analog signal on each
channel is conditioned, buffered, and then sampled by a 24-bit
Delta-Sigma ADC.
Each channel provides an independent signal path and ADC,
enabling you to sample all three channels simultaneously. Refer to
Figure 5 for an illustration of the circuitry for one channel of
the NI 9225E.
Figure 5. Input Circuitry for One Channel of the NI 9225E
NI 9225E
AI+
AI–
ADC
Amplifier
Overvoltage
Protection
Prefilter