R&S FSW Series, Руководство пользователя

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Common Measurement Settings
R&S
®
FSW
491 User Manual 1173.9411.02 ─ 43
Restrictions for continuous gating
While continuous gating reduces the number of required external trigger events, not
every sweep constellation can be performed using just one external trigger event. Note
the following restrictions:
●
The number of gates is limited to 1023. If the required measurement time exceeds
the duration of 1023 gates, a new external trigger event is necessary for each sub-
sequent 1023 gates.
●
In "Sweep Mode Type: Sweep", more than one external trigger events may be nec-
essary due to hardware segmentation of the sweep
●
In "Sweep Mode Type: FFT", more than one external trigger event may be neces-
sary, but the covered span with one external trigger event is normally larger than in
"Sweep Mode Type: Sweep".
In FFT mode, it is recommended that you activate the "Optimization mode: Speed",
as it further reduces the required number of external trigger events.
Triggered gated measurements
By default, the gate is opened by the trigger source, which is also the gate source.
However, you can also use different sources for a general trigger and the beginnning of
the individual gates. In this case, the trigger source defines when measurement is gen-
erally possible, and the gate source determines which data is actually measured.
Example:
A rotating antenna can be used as a general (external) trigger source, for example.
Only when the antenna reaches a specified position, measurement is possible. A sec-
ond external trigger can then be used to control the gating periods to measure a burs-
ted signal.
1
RF Signal
Ext. Trigger1
...
...
Frame trigger
(Ext. Trigger2)
Measured
Gates
...
...
1 2 3 4 5 6 7 8
2 3 4 5 6
Figure 8-34: Triggered gated measurement
Triggered gated measurements are only available in applications based on frequency
sweeps (not I/Q-data based), such as the Spectrum application.
8.6.2.2 Gate Settings
Access : "Overview" > "Trigger" > "Trigger / Gate Config." > "Gate Settings"
Trigger and Gate Configuration