What is a typical practical value for the accuracy and repeatability of the PIFOC piezo focus drive?

Technical Note: 46
Reads: 7043
Creation Date: 31/03/2000
Modification Date: 19/08/2005

The repeatability of the Piezo focus drive is not determined by the hardware itself but by the instability (jitter) of the output voltage from the National Instruments 1200 card or ORBIT 2 USB. In both cases, the jitter is about 2mv - this equates to an error of +/- 20nm.