Newport NPC DIG Series, Instruction Manual

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The following sketch describes the step response of the different terms:
sketch 2: transfer function
When using a notch filter, the main resonant frequency will be damped by an order of magnitude. While
using open loop you can also switch on the notch filter to reduce stimulation of the resonant frequency.
Using the notch filter might increase noise.
The PID-specific parameters kp, ki, and kd are stored in the actuator’s ID-chip by default. These
parameters will work for most applications. Depending on your special application and load, the
mechanical response can be optimized.