The servo controller module inside the E665 control unit can be tuned to move the PI-726 piezo objective holder as fast as possible. 6ms should be achievable for 10µm steps with the Zeiss 20x objective.

• Unplug
• Take the lid off (6 screws side and rear)
• Plug back in
• Identify servo module (see manual)
• Identify P1-P4 and P6 potentiometers
• Choose a step size on the large end of what you will use for a single step (we did 10µm)
• Have Igor give a whole load of pulses at that step size
• Change P3 and P2 to make it faster (these are integration time and gain of feedback loop)
• If you can't get any faster then change P1 Slew rate limiter to allow faster movement
• Try to get something as square as possible and be prepared to have a very slight overshoot at the start of the step (100-200nm may well be irrelevant)
• Adjust P6 (it may need quite a few turns) to get step size to be exactly 10µm again.