Agilent Technologies 8719D, User Manual

Page: 386 / 673

The System Menu
The key provides access to the system menu. This menu leads to additional menus
which control various aspects of the analyzer system. The following are located
within the system menu:
provides access to the menu.
. . . . . . . .
... .. ... .. . . . .
Guide).
The Limits Menu
You can have limit lines drawn on the display to represent upper and lower limits or device
specifications with which to compare the test device. Limits are in segments, where
each segment is a portion of the stimulus span. Each limit segment has an upper and a lower
starting limit value. Three types of segments are available: flat line, sloping line, and single
point.
Limits can be defined independently for the two channels, up to 22 segments for each channel.
These can be in any combination of the three limit types.
Limit testing compares the measured data with the
limits, and provides pass or fail
information for each measured data point. An out-of-limit test condition’ is indicated
ways:
with
a
FAIL
message on the screen, with a beep, by changing the color of the failing
portions of a trace, with an asterisk in tabular listings of data, and with a bit in the HP-IB
event status register B. (The analyzer also has a BNC rear panel output that includes this status,
but is only for a single channel measurement.)
Note
The limit test output has three selectable modes For more information, refer to
Chapter 2, “Making Measurements.
Limit lines and limit testing can be used simultaneously or independently. If limit lines are
on and limit testing is off, the limit lines are shown on the display for visual comparison and
adjustment of the measurement trace. However, no information is provided. If limit
testing is on and limit lines are off, the specified limits are still valid and the pass/fail status is
indicated even though the limit lines are not shown on the display.
Limits are entered in tabular form. Limit lines and limit testing can be either on or off while
limits are defined. As new limits are entered, the tabular columns
on
the display are updated,
and the limit lines (if on) are modified to the new definitions. The complete limit set can be
offset in either stimulus or amplitude value.
Limits are checked only at the actual measured data points It is possible for a device to be out
of specification without a limit test failure indication if the point density is Be sure
to specify a high enough number of measurement points in the stimulus menu.
Application and Operation Concepts