Rohde Schwarz Rohde & Schwarz HMO1002 2-channel oscilloscope, Digital Storage oscilloscope, 21-1002-RS00 数据表

The video trigger allows you to trigger on PAL, NTSC 
SECAM standard video signals or on HDTV signals. After 
selecting the VIDEO trigger press the SOURCE 

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 key. The 

FILTER 

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menu allows you to define additional settings.

The oscilloscope triggers if the CVBS signal (Color Video 
Baseband Signal) selected in the SOURCE menu features 
the attributes set in the FILTER menu. Select the desired 
standard by pressing the respective soft menu key STAN-
DARD. Use the universal knob in the CURSOR/MENU sec-
tion or press the soft menu key again to select the desired 
standard. 

The following modes are available:

 ❙PAL
 ❙NTSC
 ❙SECAM
 ❙PAL-M
 ❙SDTV 576i  

Interlaced

 ❙HDTV 720p  

Progressive

 ❙HDTV 1080p  Progressive
 ❙HDTV 1080i   Interlaced

The second setting will apply to the polarity of the sync 
pulse (may be positive or negative). With positive video 
modulation (the highest brightness is represented in the 
image by the maximum signal voltage), the synchroniza-
tion pulses are negative, with negative modulation they are 
positive. The slopes of the synchronization pulses are used 
for triggering which explains why a faulty polarity setting 
causes irregular triggering by image information. Next you 
can select between frame triggering (FRAME) and line 
triggering (LINE). Selecting LINE allows you to define the
exact line between 1 and 625 via universal knob or the 
KEYPAD button in the CURSOR/MENU section.

The soft menu item ALL LINES enables the oscilloscope to 
trigger on the start of the lines in the video signal. This key 
selects all lines i.e. even when other trigger conditions are 
met, the oscilloscope will trigger on each line. If FRAME 
is selected for frame triggering, the lower menu items will 
allow to trigger on ODD or only EVEN half frames. In this 
case, the oscilloscope will trigger on the start of the half 
frames in the video signal. The respective key will select 

Fig. 6.4: Video trigger menu

the odd (even) half frames, i.e. even if the other trigger 
conditions are met, the oscilloscope will trigger on each 
odd (even) half frame.

The trigger hold off time indicates how long after a trigger 
the R&S®HMO1002 oscilloscope waits until the trigger sys-
tem is ready again. The trigger system is active again only 
after the trigger hold off time has expired. This allows the 
function to guarantee stable triggering in case unwanted 
events are triggered. Ideally, the hold off time is used to 
trigger on periodic signals with several slopes.

HOLD OFF is a dual soft menu key. If the top section of the 
soft menu key is active (highlighted in blue), a value can 
be entered in the CURSOR/MENU section via universal 
knob or numerically via KEYPAD button. You may enter 
any value between 50 ns and 10 s. The bottom section of 
the soft menu key OFF (highlighted in blue) allows you to 
deactivate the function HOLD OFF.

Use the UTIL menu in the VERTICAL control panel on page 
2|2, and then choose the soft menu key ACQ. TRIGGER 
EV. to issue a pulse at the AUX OUT connector for each 
trigger event (Issuing The Trigger Frequency).