I’m using the SMARTDAC+ Standard Universal Viewer to convert data recorded on the GX/GP/GM, but can I reduce the number of data points to convert? For example, can I take per-second data and output it to Excel as per-minute data?

Yes. In SMARTDAC+ Standard Universal Viewer, select Convert > Convert data, and specify a number of “Steps.” Ex.) To filter data recorded every second and output only the data recorded every minute, specify 60 steps.