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Triggering the Oscilloscope
Level Selection and Setting
After the trigger condition setting is completed, you need to adjust the trigger level
to correctly trigger the signal and obtain a stable waveform.
Click or tap the Level A/Level B input field to set the level A/level B with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob to adjust
level A/level B or use the trigger level knob to adjust level A. When Linkage is ticked,
the upper limit and lower limit values change at the same time. The difference
between upper and lower limit remains unchanged. For details, refer to
The current trigger level is displayed in the trigger information label at the top of the
screen.
8.7.4
Video Trigger
The video signal can include image information and timing information, which adopts
different standards and formats. This series 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
Click or tap the Type drop-down button to select "Video".
After a trigger type is selected, the current trigger setting information (including
trigger type, trigger source, and trigger level) is displayed in the trigger information
label at the top of the screen, as shown in the figure below. The information will
change based on the trigger settings.
HDO4000 User Guide
80
Figure 8.8 Video Trigger Setting Menu
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Trigger Level
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