HP 16534A User Reference page 30

Time Base Functions
The s/Div and Delay time base fields control the horizontal display on
the oscilloscope. There are three rows of fields displayed on the
oscilloscope. The s/Div and Delay fields are located in the bottom row
of fields. These two fields are displayed on all of the oscilloscope
menus, except for the Calibration menu.
When the s/Div is changed in a multi-card module, all channels are
sampled according to the new timebase setting. When the Delay field
is changed in a multi-card module, all channels are delayed according
to the new delay setting.
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