HP Designjet 510 Printer series - Manual (Page 76)

Advance calibration values
The printer stores the advance calibration values of the last two
different types of paper used for the calibration. When you print, the
printer tries to match the paper you have selected to the stored
values. If there is a match the printer applies the stored Advance
calibration values.
If the type of paper you are using has not been used for either of the
last two Advance calibrations, the printer uses a set of default values
for your paper.
The Restore factory option of the Advance calibration menu erases any stored advance calibration values from
the printer memory. This means that until you run the advance calibration again the printer will use the factory
default values for all types of paper.