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Operating Instructions
2–14
TDS 684A, TDS 744A, & TDS 784A Service Manual
H Gated measurements
H Number of events
H Template generation
H Trigger position
H Holdoff
H Offset
H Variable persistence
In all cases, the menus are used to select the function to which the general
purpose knob is assigned. The following attributes apply to this knob:
H Depending on the function it is assigned to control, the general purpose knob
may vary numerical readouts, position objects (cursors) on screen, or select
between icon-label settings that show up in side-menu labels.
H The general purpose knob has a readout area at the upper right corner of the
screen. (See Figure 2–1.) This readout always reflects the name and value of
the function that the general purpose knob is currently controlling.
H Whenever the general purpose knob assignment is changed, a knob icon
appears immediately to the left of the general purpose knob readout to notify
you of the assignment change. The icon is removed as soon as you use the
general purpose knob to change the value of the function it is assigned to.
H To assign the general purpose knob to control a function, display the menu
containing the function; then select the function. (Note that not all functions
can be controlled by the general purpose knob.)
H Whenever the menu is removed, the general purpose knob is not assigned
and doesn’t control any function. (An exception is the cursor function. If
cursors are turned on, removing the menu leaves the knob assigned to
control the cursors until reassigned by selecting another menu and function
that uses the knob.)
H When the SHIFT button is lighted, the general purpose knob becomes a
coarse adjustment. When the SHIFT button is not lighted, the general
purpose knob becomes a fine adjustment.
H The general purpose knob also has a SELECT button. This button is used to
toggle the knob between the control of either of the two cursors displayed
when H-bar or V-bar cursors are turned on in the cursor menu.