The best I see on the Fluke site if the CALIBRATION MANUAL (not sure if that was what was offered). If you have found the section on the Fluke website with manuals for the 1650B series, and the 1650B series (UK), that is probably all that they make available to the public. Depending on what you need to do to it, if it is software adjusted on a newer instrument, there may not be a full adjustment available.
I would recommend contacting your sales representative for your area, or contacting Fluke.