I'm only doing measurement at a constant frequency, 100 Hz. And I am using the Averaging function on the keypad of the 4192.
As for going on to the next measurement, I'm not using any control, that I know of. I (naively) assumed the instrument would make a new measurement with each increment of the FOR loop. Am I wrong? If there's some way to control the sampling rate (either in the Labview sub vi, or on the 4192 itself), then that's probably where my answer lies.