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Operating Concepts
Limit Line Operation
Edit Limits Menu
This menu allows you to specify limits for limit lines or limit testing, and presents a table of limit values on
the display. Limits are defined in segments. Each segment is a portion of the stimulus span. Up to 22 limit
segments can be specified for each channel. The limit segments do not have to be entered in any particular
order: the analyzer automatically sorts them and lists them on the display in increasing order of start
stimulus value.
For each segment, the table lists the segment number, the starting stimulus value, upper limit, lower limit,
and limit type. The ending stimulus value is the start value of the next segment, or a segment can be
terminated with a single point segment. You can enter limit values as upper and lower limits or delta limits
and middle value. As new limit segments are defined, the tabular listing is updated. If limit lines are
switched on, they are shown on the display.
If no limits have been defined, the table of limit values shows the notation EMPTY. Limit segments are added
to the table using the
softkey or edited with the softkey, as previously described. The last
segment on the list is followed by the notation END.
Edit Segment Menu
This menu sets the values of the individual limit segments. The segment to be modified, or a default
segment, is selected in the edit limits menu. The stimulus value can be set with the controls in the entry
block or with a marker (the marker is activated automatically when this menu is presented). The limit values
can be defined as upper and lower limits, or delta limits and middle value. Both an upper limit and a lower
limit (or delta limits) must be defined: if only one limit is required for a particular measurement, force the
other out of range (for example +500 dB or 500 dB).
As new values are entered, the tabular listing of limit values is updated.
Segments do not have to be listed in any particular order: the analyzer sorts them automatically in increasing
order of start stimulus value when the
key in the edit limits menu is pressed. However, the easiest
way to enter a set of limits is to start with the lowest stimulus value and define the segments from left to
right of the display, with limit lines turned on as a visual check.
Phase limit values can be specified between +500 and 500. Limit values above +180 and below 180
are mapped into the range of 180 to +180 to correspond with the range of phase data values.
Offset Limits Menu
This menu allows the complete limit set to be offset in either stimulus value or amplitude value. This is
useful for changing the limits to correspond with a change in the test setup, or for device specifications that
differ in stimulus or amplitude. It can also be used to move the limit lines away from the data trace
temporarily for visual examination of trace detail.
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