Smooth voltage output jumps

[joehsiao]

As illustrated in the attached image, my program outputs a set of voltage values over and over. The issue is when starting a next loop, it has to do a large jump from last value to a first value, which causes mechanical vibrations from an instrument.  Is there any way to avoid/smooth that?

[billko]

Yes, there is.  Don't do that.  If the test requires you to make that jump, you'll have to live with the fallout.  If it doesn't, ramp it down like you ramped it up.

[Bob_Schor]

You could also put a filter (analog or digital) on your output.  It will, of course, affect all of the signal.  Once again, however, here's someone asking for help, but not showing us the relevant LabVIEW code so that we can make LabVIEW suggestions ...

Bob Schor

[joehsiao]

Here I attached part of the VI that does the analog output.

• The data line of analog write is a 2D array of three rows, for ao0, ao1, and ao2 respectively.
• /Dev4/PFI1 is the clock source, whose signals are defined by a counter as a square wave train, so the data values are looped over and over.

[Ben]

Chase your 2D array back to where you create it.

Use Reverse array and concantenate the original with the reversed and try again.

Ben