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8.7.4 Video Trigger
The video signal can include image information and timing information, which adopts
different standards and formats. This series oscilloscope can trigger on the standard
video signal field or line of NTSC (National Television Standards Committee), PAL
(Phase Alternating Line), or SECAM (Sequential Couleur A Memoire).
Trigger Type:
Press Type, and then rotate the multifunction knob to select "Video". Press down
the knob to select the type. Then, the current trigger setting information is displayed
at the upper-right corner of the screen, as shown in the figure below. You can also
press Type continuously or enable the touch screen to select it.
Source Selection:
Press Source to switch the trigger source and select CH1-CH4. For details, refer to
descriptions in "
Trigger Source
". The current trigger source is displayed at the upper-
right corner of the screen.
NOTE
Only when we select the channel (that has been input with signals) as the trigger source, can
we obtain a stable trigger Wave.
Video Polarity:
Press
Polarity continuously to select the desired video polarity. The polarities
available are positive polarity ( ) and negative polarity ( ).
Video Standard:
Press Standard, and rotate the multifunction knob to select the desired video
standard. You can also press Standard continuously or enable the touch screen to
select it.
Video Standard
Frame
Frequency
(Frame)
Scan Type TV Scan Line
NTSC 30 Interlaced Scan 525
PAL/SECAM 25 Interlaced Scan 625
480p/60Hz 60 Progressive Scan 525
576p/50Hz 50 Progressive Scan 625
To Trigger the Oscilloscope
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