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X1 and X2 Fields (Markers Sample mode only)
The X1 and X2 markers are used for displaying and rescaling specific data
values. Assigning values to these fields can be accomplished in either of two
ways. When the field is selected the first time, it turns light blue and
operating the knob changes the value. If the field is selected a second time, a
pop-up keypad appears and becomes the entry method. The X1 field
positions the green X-axis marker and the X2 field positions the yellow X-axis
marker. You can zoom in on the data between the X1 and X2 markers by
selecting the Rescale Field and selecting "between X axis markers." For more
information on rescaling data, refer to "Rescale" later in this chapter.
Pattern
When Pattern is selected, two markers labeled X and O become available.
Pattern markers identify and mark unique bit patterns in the data. Once the
unique bit patterns are marked, they can be used as reference points or, in
timing mode, as criteria for a stop measurement.
Find X-pattern / Find O-pattern Field
The Find X-pattern / Find O-pattern field is a toggle field which is used to
select the X or O marker for setup. The marker criteria set will be assigned
to the pattern marker that is designated in this field. To assign marker
criteria to the other marker, the other pattern marker must be designated in
this field.
Occurrence Field
The occurrence field for both the X and O markers designates which pattern
occurrence the marker is placed on. The maximum numeric value in the
occurrence field is limited only by the total number of samples allowed by the
memory configuration.
The occurrence field can be set in two ways. When the field is selected one
time, it turns light blue and knob operation becomes the entry method. If the
field is selected a second time, a pop-up keypad appears and becomes the
entry method.
The reference point from which the counting of occurrences starts is either
the trigger point, the start of the trace, or in the case of the O marker, the X
marker.
The Chart Menu
Pattern
8–6