HP 8712ET User Manual page 126

Figure 4-4
Figure 4-5
Using Instrument Functions
Using Markers
Peak and Minimum Search Criteria
When the maximum or minimum point is at or near either edge of the
display, the excursion requirement is satisfied by a half of a division
excursion on just one side of the maximum (or minimum). See
4-5.
Peak and Minimum Search Criteria at Display Endpoints
4-8
Figure
ET User's Guide