Agilent Technologies Infiniium 8000A Programmer's Reference Manual page 528

Command
<edge
_direction> {RISing | FALLing | EITHer} for start and stop directions.
<edge
_number> An integer from 1 to 65534 for start and stop edge numbers.
<edge
_position> {UPPer | MIDDle | LOWer} for start and stop edge positions.
Command
<start> An integer from 1 to 100 for horizontal starting point. (Default value is 40%.)
<stop> An integer from 1 to 100 for horizontal stopping point. (Default value is 60%.)
<start_after> An integer from 1 to 63,488 for number of hits to acquire before making
Measure Commands
DEFine
:MEASure:DEFine DELTatime,<start_edge_direction>,
<start_edge_number>,<start_edge_position>,
<stop_edge_direction>,<stop_edge_number>,
<stop_edge_position>
:MEASure:DEFine EWINdow,<start>,<stop>
[,<start_after>]
The :MEASure:DEFine EWINdow command is used to change the starting point
and the stopping point of the window used to make the eye pattern
measurements of eye height, eye crossing %, and eye q-factor. In addition, the
number of waveform hits can be set to ensure that enough data has been
collected to make accurate measurments.
measurements. (Default value is 1.)
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