Can I adjust the Z scale of a previously-captured NanoScope image so that the measurements are correct?
Yes. First, make a backup copy of your image files. Then, use the following procedure (given for version 4.23 software- other versions are similar): Start Z, go to offline, open the image file you want to change, go to Modify Parameter. The Parameter command allows the Z range and Scan size of a captured image to be rescaled based on new sensitivity information. For example, suppose you found that the original height measurements were too low by 5%. Record the Z range value displayed in the dialog box. Multiply it by 1.05 and enter the result in Z range. When the image is re-displayed, you will measure the corrected height.