HP 54721A User Reference page 11

Channel Setup Menu
When you press the Channel-Setup hardkey on the plug-in, the
softkey menu shown in figure 2 is displayed. This chapter gives you a
description of the function of each channel softkey. Some of the
softkeys bring up additional menus on the display. A picture of each
additional menu is included along with a description of the menu.
Channel softkey menu
Figure 2
Channel number
Channel scale setting
Offset setting
11