I got one of the GW Instek GDM-8251A on ebay via the ITT auction and it reads ~300mV higher than its source. Does anyone have any insight into how you can calibrate it without a Fluke 5720A?
Is it as simple as following the manual steps in the PDF above, and for each CAL code, putting the requisite signal on the input? (ie, to calibrate for 10V, select CAL code 15, and put 10V on the V input?)