R&S FSL Triggering the Sweep – TRIG Key
1300.2519.12 4.31 E-11
Fig. 4-3: Timing diagram for GATE, GATE DELAY and GATE LENGTH
To trigger on TV signals (zero span and option TV Trigger, B6)
1. Press the TV Trig Settings submenu softkey to switch the TV trigger on and define the settings for
triggering on TV signal.
2. To configure the TV trigger, press the Vert Sync, Vert Sync Odd Field, Vert Sync Even Field or
Hor Sync softkey.
3. Press the Video Pol Pos/Neg softkey to set the polarity of the video signal.
4. Press the Lines 625/525 softkey to set the line system to be used.
Option TV Trigger, B6, is available from firmware version 1.10.
Trigger mode overview
The R&S FSL offers the following trigger modes:
• Free Run
The start of a sweep is not triggered. Once a measurement is completed, another is started
immediately.
• External
Triggering via a TTL signal at the input connector EXT TRIG / GATE IN on the rear panel.
• Video
Triggering by the displayed voltage.
A horizontal trigger line is shown in the diagram. It is used to set the trigger threshold from 0% to
100% of the diagram height.
• IF Power
Triggering of the measurement via signals which are outside the measurement channel.
For this purpose, the R&S FSL uses a level detector at the second intermediate frequency. Its
threshold can be set in a range between –50 dBm and –10 dBm at the input mixer. The resulting
trigger level at the RF input is calculated via the following formula:
Mixerlevel
min
+ RFAtt – PreampGain
Input Signal
Mixerlevel
max
+ RFAtt – PreampGain
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