Triggers
R&S
®
RTP
268User Manual 1337.9952.02 ─ 12
Setting up a 8B/10B serial pattern trigger
1. Select "Menu" > "Trigger" > "Setup".
2. Select "Type" > "Serial pattern".
3. Enable the "CDR".
4. Open the "Pattern definition" dialog.
5. Select "Pattern type" > "8b/10b".
6. Set the "Alignment".
7. Press "Append" to add a new K/D symbol.
8. Set the value of the "K/D symbol".
6.11 External trigger input
Except for using analog or digital input channels as trigger source, you can also use
external signals as trigger source. The external signal is connected to the external trig-
ger input, which is equipped with the Rohde & Schwarz probe interface. Thus, you can
use all Rohde & Schwarz probes to connect the external trigger signal. The only trigger
type to trigger on external signals is the edge trigger.
1. Connect the external trigger signal to the external trigger input.
2. Set up the probe: "Trigger" menu > "Extern" tab.
See Chapter 6.11.1, "Probe setup: Extern tab", on page 269.
3. Set up the trigger:
a) Select the "Trigger" > "Setup" tab.
b) Select the source: "Extern"
c) Adjust the trigger settings.
See Chapter 6.11.2, "External trigger setup", on page 270.
If the trigger source is a channel input, the trigger system uses the digitized signal. The
trigger system of the instrument is a separate system, thus the signal processing by
enhancement, decimation and arithmetic has no impact on the trigger signal. Most of
the R&S RTP trigger types use the digitized trigger signal.
If the trigger source is the external trigger input, the trigger comparator uses the analog
input signal. For the external trigger signal, only the edge trigger of the A-trigger is
available. Trigger sequence is not supported.
Qualification of the external trigger signal is not available.
External trigger input
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