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The module is hard-wired for AC Coupled input - hence you will only "see" a signal when there is an AC component. If you want to measure a constant voltage (DC level), I would suggest simply using one of the SCXI-110X series. It is a much cheaper solution.
AVR is correct. The SCXI-1530 has a 0.2 Hz highpass filter to block the DC component of signals. Therefore, only the AC component of your signal will be passed through the module.
