Trigger
R&S
®
RTM3000
86
User Manual 1335.9090.02 ─ 08
Signal
Selects the polarity of the signal. Note that the sync pulse has the opposite polarity. If
the video modulation is positive, the sync pulses are negative. If the modulation is neg-
ative, sync pulses are positive. The edges of the sync pulses are used for triggering,
therefore incorrect polarity setting causes a sporadic triggering by the video informa-
tion.
T
T
Figure 5-6: Positive video signal with negative bi-level sync pulse (SDTV, left) and negative signal
with positive tri-level sync pulse (HDTV, right)
Remote command:
Mode
Selects from the following the trigger conditions:
"All
Frames"
The oscilloscope triggers on the beginning of all video signal frames.
"Odd
Frames"
The oscilloscope triggers on the beginning of video signal frames with
an odd frame number.
"Even
Frames" The oscilloscope triggers on the beginning of video signal frames with
an even frame number.
"All
Lines"
The oscilloscope triggers on the beginning of all video signal lines.
"Line Number"
Triggers on an exact "Line" number.
Remote command:
Line
Sets an exact line number if "Mode" is "Line Number". The oscilloscope triggers exactly
on the beginning of the selected line in any field.
Remote command:
5.8
Pattern Trigger
The pattern trigger is a logic trigger. It provides any logical combination of the input
channels and supports you in verifying the operation of digital logic. Additionally, you
can set a time limitation to the pattern. Thus you can also trigger on bus patterns of
parallel buses.
The channel pattern is configured in the "Logic Editor" dialog box.
Pattern Trigger
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