10 Monitor Spectrum Measurement
Meas Setup
Key Path
Meas Setup, Limits
Notes Front panel only. The selected limit is remembered even when not in the Limit Menu.
Preset Limit 1
State Saved Saved in instrument state
Initial S/W Revision A.13.00
Limit On/Off
Selects whether the limit and margin are displayed. If Test Limits is on, this also determines whether the
test trace (see "Test Trace" on page 791) will be tested against the limit. If Limit On/Off is On, the following
occurs:
• The limit line is displayed, in the same color, but paler, as the limited trace. Portions of traces that fail
the limits will be displayed in red.
• The margin line is displayed if Margin is on and the Margin Value is non-zero (see "Margin" on page 796).
The margin line is displayed in the same color as the limit line, but paler still and dashed. Portions of
traces that pass the limits but fail the margin will be displayed in amber.
• The trace is tested for the purpose of the “Trace Pass/Fail”indication in the graticule if, in addition to
Limit On/Off being On, the trace is displayed and Test Limits (All Limits) is on (see "Test Limits (All Limits)"
on page 801). If the trace is not tested, no report of the trace passing or failing is seen on the graticule.
Note that the SCPI queries of Limit Pass/Fail are independent of these conditions. The test is always
performed when queried over SCPI.
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.
Note that the red and amber coloring of traces that fail the limits and/or margins only applies to traces
whose X-axis corresponds to the current analyzer X-axis. Traces that are not updating (in View, for
example) will not change color if the analyzer X-axis settings (e.g., start and stop frequency) do not match
those of the trace, for example if they have been changed since the trace stopped updating. In this case,
the Invalid Data indicator (*) will appear in the upper right corner.
When the limits are frequency limits but the trace is a zero-span trace, the limit trace is drawn at the limit
amplitude of the center frequency. When the limits are time limits but the trace is a frequency domain
trace, the limit trace is drawn according to the current time axis, with the left of the screen being 0 and the
right being equal to sweep time.
Key Path
Meas Setup, Limits
Remote Command
:CALCulate:LLINe[1]|2|...|6:DISPlay ON|OFF|1|0
:CALCulate:LLINe[1]|2|...|6:DISPlay?
Example CALC:LLIN2:DISP ON
CALC:LLIN2:DISP?
Couplings Limit display ON selects the limit. Testing is done on all displayed limits if Test Limits (All Limits) is
ON. Entering the limit menu from the GUI turns on the selected limit.
790 EMI Receiver Mode Reference
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