Hi, I'm currently using the NI-9215 to measure 3 analog voltage inputs simultaneously. Before I had used the USB carrier (USB-9162), but we have a need for additional module slots, so I was attempting to use the Compact DAQ Chassis (NI-9172). I'm continuously sampling 500 samples at 10kHz. The problem is that the time to run each set of samples is very different between the two different platforms (DAQ Chassis and USB Carrier) using the exact same VI. Using the DAQ Chassis it takes about 0.15 seconds whereas the USB carrier takes only about 0.07 seconds, per set of samples. I have tried using DAQmx and DAQ assistant, as well as trying multiple computers and multiple NI-9215 modules, all with the same result. I can find no clear differences between the peformance of the carrier and the DAQ chassis. Does anyone have any suggestions or clues as to what could be causing this problem? I can upload my VI if that helps, but it seems like this was more of a hardware issue. Thanks for your time - Dan
