Rohde & Schwarz RTM2032 - Page 62

Triggers
R&S
®
RTM20xx
47User Manual 1317.4726.02 ─ 01
You can trigger on various SDTV signals like PAL, PAL-M, SECAM, NTSC and
SDTV 576i (PAL and SECAM).
HDTV standards are indicated by the number of active lines and the scanning system (p
for progressive scanning, i for interlaced scanning.
Remote command:
TRIGger:A:TV:STANdard on page 307
Signal
Selects the polarity of the signal. Note that the sync pulse has the opposite polarity. If the
video modulation is positve, the sync pulses are negative. If the modulation is negative,
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 information.
T
T
Fig. 3-3: Positive video signal with negative bi-level sync pulse (SDTV, left) and negative signal with
positive tri-level sync pulse (HDTV, right)
Remote command:
TRIGger:A:TV:POLarity on page 307
Trigger On
Toggles between triggering on line starts or frame starts.
Line aloows to trigger on "All Lines" or on one specified "Line".
"Frame" has different effect depending on the selected signal standard:
●
For standards using progressive scanning (HDTV 720/1080i), the instrument triggers
on the frame start.
●
All other available standards use interlaced scanning, and the instrument triggers on
the field start. You can select the field type to be triggered on using "Frame".
Remote command:
TRIGger:A:TV:FIELd on page 307
Line
Sets an exact line number if "Trigger on" is "Line". If the other trigger conditions are also
met, the oscilloscope triggers exactly on the beginning of the selected line in any field.
Remote command:
TRIGger:A:TV:LINE on page 308
All Lines
The oscilloscope triggers on the beginning of all video signal lines if "Trigger on" is
"Line".
Remote command:
TRIGger:A:TV:FIELd on page 307
Reference for Triggers