(a) Operation is the same before, in the subordinate mune of calibration mode,
using [↑] or [↓] to select (3) DC H/V Cal , LCD display as following
(c) Press S1[UP] or S2 [DOWN] to adjust code, let the reading value match or
closer to the standard voltage as much as possiable
(d) Aslo you can press S4 [AUTO] adjust code automatically
(e) After setup finished, press S5 [DONE] to save
(f) If you want to abandon data, press S6[QUIT] to exit this screen