digital resolution

I have a digital amplifier EVD50 and want to control the piezo stage by PC. How do I get to know the minimum step size?

The minimum step size (resolution) is determined by the stroke of the actuator and the bit resolution of the serial interface, and can be calculated by dividing the full stroke by the 20 bit resolution of the interface (1,048,576).

In the case of a PX 400, the resolution is calculated by 400 µm divided by 1,048,576, which results in a resolution of 0.4 nm.

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