HP 8711C User Manual page 111

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Using the Next Peak and Next Min Functions.
As explained previously, pressing W -> Max and Mkr -> Min will
place a marker on the maximum and minimum points on the measurement
trace, respectively. You can search for the next highest or lowest point
using the Hex% Peak Right , Hex% Peak Left , ??a~?z Min Righ% and
A maximum (or minimum) point is detected whenever an amplitude
excursion greater than half of a division occurs. The half of a division
excursion requirement must be satisfied on both sides (left and right) of the
peak (or minimum). The maximum (or minimum) point must be >-60 dl3.
See Figure 4-4.
Figure 4.4. 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 Figure 4-5.
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Using Instrument Functions
X Does Not Meet
Peak Search
Criteria
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Using Markers
Division
4 - 9
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