Keysight E6640A, Measurement Applications User & Programmer Reference

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10 Spectrum Emission Mask Measurement
Sweep/Control
Turning Gate View off returns the analyzer to the Normal measurement view.
In the 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 softkeys 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:
•
Green lines are displayed at the gate edges as follows: in Edge Gate, a line is shown for Delay and one
for the end of the Gate period, defined by Length. You can adjust the position of the green lines by
adjusting the gate length and the gate delay. These lines update in the Gate View window as the active
function changes, even if the window is not being updated. In Gated FFT, their location is relative to the
left edge of the screen.
•
A blue line is displayed showing the delay reference, that is, the reference point for the Gate Delay
within the Zero Span window. The blue line represents where (in time) the effective location of the gate
start would be if the gate were programmed to zero delay.
•
Gate View Setup
Accesses a menu that enables you to setup parameters relevant to the Gate View
Key Path
Sweep/Control, Gate
Scope Meas Global
Initial S/W Revision A.10.00
Gate View Acquisition Time
Controls the acquisition time in the Gate View window. To provide an optimal view of the gate signal, the
analyzer initializes Gate View Acq Time based on the current settings of Gate Delay and Gate Length.
Key Path
Sweep/Control, Gate, Gate View Setup
Remote Command [:SENSe]:SWEep:EGATe:TIME <time>
[:SENSe]:SWEep:EGATe:TIME?
Example SWE:EGAT:TIME 500 ms
Dependencies Gate View Acquisition Time is initialized:
•
On Preset (after initializing delay and length).
•
Every time the Gate Method is set/changed.
1. Compute the location of the "gate stop" line, which you know is at time t = tmin + Gat
1268 W-CDMA & HSPA Measurement Applications Reference