Simultaneo​us sampling for 12 channels of SCXI-1531

Question

1) I have a SCXI-1000 chassis, with 1 acquisition board SCXI-1600 and 3 signal conditioners SCXI-1531.
Is it possible to acquire with simultaneous sampling the first 12 channels (8 from the first SCXI-1531 and 4 from the second) and then, the next, simultaneously again, 12 channels, (the remainning 4 channels from the second SCXI-1531 and the 8 from the third)?
2) Lets say I had 2 identical chassis (same boards), like the one described before, both connected to a USB switch, and this switch connected to a host PC.
Is it possible to acquire simultaneously the first 12 channels from "Chassis 1", then, the next 12 channels from "Chassis 1", then, the first 12 channels from "Chassis 2" and finally the 12 remainning channels from "Chassis 2"?
Thanks,
Gonzalo Soteras L.
SPM Ingenieros Ltda.

Answer 1

Gonzalo,
Unfortunately, you can only run one analog input task at a time on your
SCXI-1600. To do what you want, I would suggest acquiring at twice the
rate you desire, and discarding alternating samples for the first half
of the channels, and discarding the opposite samples for the second
half. This would give you the data you need.
The good news is that if you had 2 chassis, with 2 SCXI-1600s, you
could run 2 identical tasks on each of these. Instead of a USB Hub,
however, I would plug them both into your computer. This will give you
better performance.
Hope this helps,
Ryan Verret
Product Marketing Engineer
Signal Generators
National Instruments