National Instruments NI 9229E, NI 9239E specifications - page 7

© National Instruments Corp. 7 NI 9229E/9239E
The NI9229E /9239E 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 four channels simultaneously. Refer
to Figure5 for an illustration of the circuitry for one channel.
Figure 5. Input Circuitry for One Channel of the NI 9229E/9239E
NI 9229E/9239E
AI+
AI–
ADC
Amplifier
Overvoltage
Protection
Prefilter