8 Trigger
8.3 Gate Settings
:SWE:EGAT:VIEW ON
Dependencies In the Swept SA measurement:
In Gate View, the regular Sweep Time (or Acquisition Time) control is grayed out, to avoid confusing
the user who wants to set Gate View Sweep Time. When pressed, the grayed-out control puts up the
informational message "Use Gate View Sweep Time in the Gate menu"
In other measurements:
When you turn Gate View on, the lower window takes on the current state of the instrument. Upon
leaving Gate View, the instrument takes on the state of the lower window
When you turn Gate View on, the upper window Sweep Time (or Acquisition Time) is set to Gate View
Sweep Time (or Gate View Acquisition Time)
Couplings These couplings apply to the Swept SA measurement:
–
When Gate View is turned on, the instrument is set to Zero Span
–
Gate View automatically turns off whenever a Span other than Zero is selected
–
Gate View automatically turns off if you press the Swept Span toggle under Freq while in Gate
View, and the instrument returns to the Span it was in before entering Gate View (even if that is
Zero Span)
–
When Gate View is turned on, the sweep time used is the Gate View Sweep Time. This is set
according to the rules in "Gate View Sweep Time" on page 2693
–
When Gate View is turned off, Sweep Time is set to the normal Swept SA measurement sweep
time
–
If Gate View is on and Gate is off, then turning on Gate turns off Gate View
Preset
OFF
State Saved Saved in instrument state
Range
ON|OFF
Annunciation For Gate View to work properly, a gate signal must be present at the selected Gate Source. Therefore,
in Gate View, any time more than 2 seconds passes with no gate signal, a pop-up message "Waiting
for gate input" appears. This message goes away when a gate signal appears
Turning Gate View off returns the instrument to the Normal measurement view.
In Swept SA, the normal measurement view is the single-window Swept SA view.
When returning to this view, the Swept SA measurement returns to the Span it was
in before entering Gate View (even if that is Zero Span).
The Gate View window is triggered from the Gate Source, with zero trigger delay.
Also, when updating the Gate View window, the Gate itself must not operate. So, it
is internally shut off while the gate view window is being updated. For the Swept SA
measurement, this means that the Gate is internally shut off whenever the gate view
window is displayed. The measurement bar and controls continue to show the
Trigger source for the main sweep window and give no indication that the Gate is
shut off or that the Gate View window is triggered from the Gate Source.
When in Gate View, vertical lines are displayed in the Gate View window as follows:
2687 Spectrum Analyzer Mode User's &Programmer's Reference
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