HP 54645A User's And Service Manual page 56

On HP 54645D, the Readout softkey gives a reading of the time or
voltage cursor measurement.
For the time cursor readout, you can select Time, Hex, Binary, or
Degrees. Binary displays all digital channels by channel number. Hex
shows only the displayed channels, with the top channel displayed as
the most significant bit. When Active Cursor is t1/t2, the Readout Time
softkey sets the display to show the cursor positions in seconds, and the
Readout Degrees softkey shows the cursor positions in relative number
of degrees.
For the voltage cursor readout, you can select Volts or %. When Active
Cursor is V1/V2, the Readout Volts % softkey sets the display to show the
cursor positions in volts when Volts is highlighted, and as a percentage
when % is highlighted.
You can expand the display with delayed sweep, then characterize the event
of interest with the cursors.
Pressing the Active Cursor softkey until both time cursors or both voltage
cursors are highlighted allows you to move them together when rotating the
Entry knob. You can move the cursors together to check for pulse width
variations in a pulse train.
Front-Panel Overview
To make cursor measurements
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