Hi, Jim
It's possible to print a calibration sheet from the Calibrate menu, but we actually recommend making one out of a sheet of blank paper, cut to fit the scanner opening.
The real key to the calibration sheet is not the black stripe, but the dimensions of the sheet. When the calibration sheet is printed, the margins aren't always consistent from printer to printer, so these dimensions are pretty unreliable.
If you don't have the calibration sheet on-hand, you can use the 'Restore Default Calibration Values' option as a short-term solution until you can find or create a new sheet.
Hope this helps!
Mike Landis
The Neat Company