Triggering the Sweep – TRIG Key R&S FSL
1300.2519.12 4.32 E-11
The bandwidth at the intermediate frequency is 20 MHz. The R&S FSL is triggered as soon as the
t
rigger threshold is exceeded within a 10 MHz range around the selected frequency (= start
frequency in the frequency sweep).
Thus, the measurement of spurious emissions, e.g. for pulsed carriers, is possible even if the
c
arrier lies outside the selected frequency span.
• TV (option TV Trigger, B6, available from firmware version 1.10)
Triggering of the measurement on TV signals. In this trigger mode, only the Auto Peak and the
Sample detectors are available (for details refer to "Detector overview" on page 4.42).
In order to display different sections of a TV video signal, the R&S FSL derives several trigger
signals from the video signals. This allows triggering as well on the frame repetition as on each line
of the TV video signal.
The filter bandwidth is constant: 4.0 MHz for standards with 525 lines or 5.0 MHz for standards with
625 lines. The position of the filter is determined by the firmware in order to place the 3 dB filter
bandwidth on the center frequency, as shown in the diagramm below. For the center frequency, the
value of the vision carrier frequency should be set.
fv = vision carrier frequency fa = aural carrier frequency
fc = chrominance sub–carrier frequency BW = –3dB filter bandwidth
Fig. 4-4: 3 dB Filter bandwidth (option TV Trigger, B6, available from firmware version 1.10)
• Time Trigger (available from firmware version 1.60)
Triggering of the measurement by a time intervall, set via the Repetition Intervall softkey.
To Next Page
Loading...
