How does the step response specification relate to scanning speed?
A nanopositioner with a high resonant frequency will have a fast step response specification. A nanopositioner with a fast step response specification allows the user to increase the bandwidth of the control loop. A high bandwidth control loop reduces phase delay, which in turn allows the user to scan at an increased rate. Phase delay induces tracking errors that are especially noticeable at the corners of common scanning waveforms.
