HP 8753D, User Manual, Page: 374 / 678

Limit lines are displayed only on Cartesian formats . In polar and Smith chart formats , limit
testing of one value is available: the value tested depends on the marker mode and is the
magnitude or the rst value in a complex pair . The message NO LIMIT LINES DISPLAYED is
shown on the display in polar and Smith chart formats .
The list values feature in the copy menu provides tabular listings to the display or a printer
for every measured stimulus value . These include limit line or limit test information if these
functions are activated. If limit testing is on, an asterisk is listed next to any measured value
that is out of limits . If limit lines are on, and other listed data allows sucient space , the upper
limit and lower limit are listed, together with the margin by which the device data passes or
fails the nearest limit.
If limit lines are on, they are plotted with the data on a plot. If limit testing is on, the PASS or
FAIL message is plotted, and the failing portions of the trace that are a dierent color on the
display are also a dierent color on the plot. If limits are specied, they are saved in memory
with an instrument state .
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 dened in segments . Each segment is a portion of the
stimulus span. Up to 22 limit segments can be specied 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 .
F or 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. Y ou can enter limit values as
upper and lower limits or delta limits and middle value . As new limit segments are dened, the
tabular listing is updated. If limit lines are switched on, they are shown on the display .
If no limits have been dened, the table of limit values shows the notation EMPTY . Limit
segments are added to the table using the
NNNNNNNNNNN
ADD softkey or edited with the
NNNNNNNNNNNNNN
EDIT 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 modied, 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 dened as upper and lower limits , or delta limits
and middle value . Both an upper limit and a lower limit (or delta limits) must be dened:
if only one limit is required for a particular measurement, force the other out of range (for
example +500 dB or 0500 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
NNNNNNNNNNNNNN
DONE 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 dene the segments from left to right of the display , with limit lines turned
on as a visual check.
Phase limit values can be specied between +500 and 0500 . Limit values above +180 and
below 0180 are mapped into the range of 0180 to +180 to correspond with the range of
phase data values .
Application and Operation Concepts 6-107