To position the markers, touch the appropriate field for marker selection.
The field will turn light blue and can then be set using the knob. The Trig
to X field controls the green marker and the Trig to O field controls the
yellow marker. The trigger point is displayed with the red marker. To set
the markers at a predetermined time relationship, touch the field a second
time, the field will turn white and a numeric keypad will appear. Set the
desired time reference, including the time units on the right column of the
keypad, and touch done to close the pop-up.
When the X to O field is light blue, both markers can be moved with the
knob, but the relative placement between them will not change.
Figure 6-5. Time Reference Pop-up Menu
Interpreting the Display HP 16510B
6 - 4 Front-Panel Reference