Both the NI-9225 and NI-9238 have delta-sigma ADCs, which means that each of them has its own independent hardware clock. To solve the issue described above, the clocks of the different input modules need to be synchronized to each other.To do so, the internal clock's signal of one of the CompactRIO modules used shall be exported so the other module(s) can use this clock signal instead of their own ones. The second part of the page titled Configuring the Master Timebase Source for a Module (FPGA Interface) from NI CompactRIO Device Drivers Help explains how to define a master module, and how to share its master time-base source with other, slave modules.
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