As PXIe-4145 is Source Measurement Unit ie. SMU is not designed for signal acquisition. Therefore it is not the proper way of using this device. Basically, SMU is to slow for this task: its sample rate is very low. So I suggest you use scope, digitizer or other DIO device.
I can help you to choose a more proper acquisition device for your tasks. For that could you please give me more detailed information/requirements related to your project.
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