HP 16534A User Reference page 37

Time Base Functions
Sample Period Field
Sample Period Value Display
Any time the markers (either voltage and/or time) are turned on, the current
marker settings may be displayed on the channel, trigger, display and
auto-measure menus by using the Display Options field located to the right
of the time base Delay field. The Display Options field is also used to access
the channel labeling field. Refer to the Display Menu chapter for channel
labeling details. Refer to the Marker Menu chapter for further details about
the Marker Value display.
On the marker menu, if time markers are turned off, the Sample Period
display will appear on the marker menu. If time markers are selected as
either On or Auto, the Sample Period display is not visible on the Marker
menu.
The Display Options field never appears on the Marker menu.
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