Agilent Technologies E5070B, Руководство пользователя

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374 Chapter 11
Limit Test
Limit Test
Limit Test
The limit test feature allows you to set the limit line for each trace and then perform the
pass/fail judgment for the measurement result.
Concept of limit test
The limit test is a function to perform pass/fail judgment based on the limit line you set
with the limit table.
In the limit test, if the upper limit or lower limit indicated by the limit line is not exceeded,
the judgment result is pass; if it is exceeded, the judgment result is fail for all measurement
points on the trace. Measurement points in a stimulus range with no limit line are judged as
pass.
NOTE The targets of the pass/fail judgment are measurement points only. Parts interpolated
between measurement points are not judged.
You define the limit line by specifying the stimulus value (Begin Stimulus) and response
value (Begin Response) of the begin point, the stimulus value (End Stimulus) and response
value (End Response) of the end point, and the type (lower limit/upper limit). For more
information, refer to “Defining the limit line” on page 376.
When the limit test is on, measurement points that fail are displayed in red on the screen
and the trace’s pass/fail judgment result based on the results of individual measurement
points (fail if one or more measurement points on the trace fail) is also displayed. You can
check the pass/fail judgment result for the channel (fail if one or more traces fail in any of
the limit test, the ripple test or the bandwidth test within the channel) on the screen as well.
For more information, refer to “Displaying judgment result of limit test” on page 375.
In addition to viewing the screen, you can check the judgment result of the limit test by the
following methods.
• Beep that occurs when the judgment result is fail.
• Using the status register (for more information, refer to the Programmer's Guide).