Rohde Schwarz Rohde & Schwarz HMO1002 2-channel oscilloscope, Digital Storage oscilloscope, 21-1002-RS00 Ficha De Dados
Códigos do produto
21-1002-RS00
23
Trigger System
6 .3 .4 Video Trigger
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
SECAM standard video signals or on HDTV signals. After
selecting the VIDEO trigger press the SOURCE
32
key. The
FILTER
36
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.
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
❙NTSC
❙SECAM
❙PAL-M
❙SDTV 576i
Interlaced
❙HDTV 720p
Progressive
❙HDTV 1080p Progressive
❙HDTV 1080i Interlaced
❙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.
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
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.
conditions are met, the oscilloscope will trigger on each
odd (even) half frame.
6 .3 .5 Hold Off
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.
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.
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.
6 .4 Trigger Events
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).
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).
Changing the time base does not impact the selected hold off
time.
time.