Scaling the waveforms so they have the same minimum and maximum amplitudes is easy. Find the maximum and minimum of each waveforms and correct one of them for gain and offset until they match. The amplitude of each waveform (peak-peak) is the difference between its maximum and it minimum (max - min), while the offset is (min + max) / 2.
Aligning in time is more tricky and depends on your actual situation. Do you want to strech the waveforms in time until they align, or do you just want to truncate the longest one to match the short one? Are they sampled at the same rate?
In any case what you can do is to modify the sampling interval (dt value) of one of them. This will strech/compress the waveform in time so you can adjust the new length (in seconds). You
can then display the two waveforms on the same graph and compare them visually.
But you will not be able to compare them by, for example, subtracting them because their samples are not aligned (since the sample rates are different). If you want to do that (and have LaVIEW 7.0), you can then align them sample by sample using the dedicated VI Align Waveforms (single shot).vi located in the palette Analyze>>Waveform Conditioning. This VI will do the job automatically for you by resampling one of the waveform to match the other one.
