Hello,
In your case, either board would probably serve your purpose. Each of the individual boards has its individual advantages though. The 6070E has a higher overall sampling rate (1.25 MS/s), but this card multiplexes between all of its analog inputs because there is only one analog-to-digital converter on the board. This means that all of the channel readings acquired are not acquired at the exact same instant, but are offset from each other by a small amount of time. The 6070E also has a larger input voltage range at +/- 10V.
The 6143, on the other hand, is a simultaneous sampling DAQ card, meaning that each of the analog inputs has its own analog-to-digital converter associated with it. So the big advantage of the 6143 is that signals can be acqu
ired on multiple channels at the same instant in time.
I hope this helps! Let me know if there is anything I can help with or clarify.
Ken S.
Applications Engineering
National Instruments