3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
If the trace is at or within the bounds of all applicable limits, but outside the bounds
of some applicable margin, the text “Trace x Fail Margin” is displayed in amber,
where x is the trace number. A separate line is used for each reported trace. If the
trace is outside the bounds of some applicable limits, the text “Trace x Fail” is
displayed in red, where x is the trace number. A separate line is used for each
reported trace. If the trace has no enabled limits, or the trace itself is not displayed,
no message is displayed for that trace.
The PASS/FAIL box in the corner of the Meas Bar is only displayed if there is at least
one “Trace Pass/Fail” indication displayed in the graticule.
If two amplitude values are entered for the same frequency, a single vertical line is
the result. In this case, if an upper line is chosen, the lesser amplitude is tested. If a
lower line is chosen, the greater amplitude is tested.
This command only affects the display, and has no impact on remote behavior. Limit
queries over SCPI test the trace against the limit regardless of whether the trace or
the limit is turned on (exception: :CALCulate:TRACe[1]|2|3|4|5|6:FAIL? tests
only the limits that are turned on for that trace).
Remote
Command
:CALCulate:LLINe:TEST OFF | ON | 0 | 1
:CALCulate:LLINe:TEST?
Example Turn on testing, and display the results in the upper left corner:
:CALC:LLIN:TEST ON
Preset
ON
Not affected by Mode Preset, preset by Restore Mode Defaults
State Saved Saved in instrument state
Annotation If this is on, the active limit window displays the information above regarding pass/fail for each
displayed limit
X-Axis Unit
Selects how the limit-line segments are defined. Pressing X-Axis Unit selects
whether the limit lines are entered using frequency (Freq) or sweep time (Time) to
define the segments. They can be specified as a table of limit-line segments of
amplitude versus frequency, or of amplitude versus time.. When the X-Axis Unit is
set to Time, a time value of zero corresponds to the start of the sweep, which is at
the left edge of the graticule, and the column and control in the Limit Table Editor
reads Time instead of Frequency
Switching the limit-line definition between Freq and Time erases all the current limit
lines. When you do this from the front panel, a warning dialog appears letting you
know that you are about to erase all the limit lines, and prompting you to hit “OK” if
you are sure:
Caution: Changing X-Axis Unit erases all your limit lines. Are you sure you want to
do this? Press Enter or OK to proceed, or Cancel(Esc) to cancel
402 Spectrum Analyzer Mode User's &Programmer's Reference
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