Hitesh, Thanks for the help. Changing the displayOutput saved 0.25 seconds, which is helpful. I'm still having trouble with ps4000aGetValuesBulk. [numSamples, overflow, chA] = invoke(rapidBlockGroupObj, 'ps4000GetValuesBulk', 0, 0, 1, 0); Error using icgroup/invoke (line 60) The function ps4000GetVa...