Hello Lynn
You cannot measure a 2 Hz, 3 Hz, 4 Hz, 5 Hz, 6 Hz, or even 1 Hz sinewave with this device as you said, but here using the NI WSN 3202 node i am able to get the 2 samples @ 0.5 seconds upto 16 samples @ 0.0625 seconds perfectly. here we are not concerned about the power consumption. Now tell me that how to get the sine waved and its FFT using NI WSN 3202 @ 1Hz.