3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
Traces that are not updating (in View, for example) do not change color if the
instrument X-axis settings (for example, Start Freq and Stop Freq) 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 (*) appears in the upper right-hand
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.
Remote Command
:CALCulate:LLINe[1]|2|…|6:DISPlay OFF | ON | 0 | 1
:CALCulate:LLINe[1]|2|…|6:DISPlay?
Example Turn on the display for Limit Line 2:
:CALC:LLIN2:DISP ON
Dependencies Generates an “Option not available” error message unless you have the proper option installed in your
instrument
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 user interface turns on the selected limit
Preset
OFF
State Saved Saved in instrument state
Backwards
Compatibility SCPI
:CALCulate:LLINe[1]|2:STATe OFF | ON | 0 | 1
Margin
Selects a Margin for this limit, which causes a trace to Fail Margin when the trace is
between the Limit Line and the Margin Line. Portions of the traces that pass the limit
but fail the margin are displayed in amber.
A margin is always specified in dB relative to a limit – an upper limit always has a
negative margin, and a lower limit always has a positive margin. If a value is entered
with the incorrect sign, the system automatically takes the negative of the entered
value.
If the limit type is switched from lower to upper while margin is present, the margin
reverses sign.
When the Margin is selected, it may be turned off by pressing the Margin control
until the toggle is next to Off. This may also be done by performing a preset. Margin
is the default active function whenever the margin is on, and it is not the active
function whenever the margin is off.
Spectrum Analyzer Mode User's &Programmer's Reference 389
To Next Page
Loading...
Need help?
General
