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Sync
In the
Sync item, select the desired sync type.
• All Lines: triggers on the first line found.
• Line: triggers on the specified line.
When this sync type is selected, you can specify a line number. Click or tap the
input field of Line to set the line number by using the pop-up numeric keypad.
You can also use the corresponding multipurpose knob to set the value. The
range of the line number is related to the currently selected video standards. The
range is from 1 to 525 (NTSC), 1 to 625 (PAL/SECAM), 1 to 525 (480p), 1 to 625
(576p), 1 to 750 (720p), or 1 to 1125 (1080p/1080i).
• Odd: triggers on the rising edge of the first ramp pulse in the odd field. It is only
available when the video standard is set to "NTSC" or "PAL/SECAM".
• Even: triggers on the rising edge of the first ramp pulse in the even field. It is
only available when the video standard is set to "NTSC" or "PAL/SECAM".
Trigger Mode
In
Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer to
descriptions in
Trigger Mode
.
Trigger Parameter Setting
You can refer to
Noise Rejection
to set the noise rejection under this trigger type.
Trigger Level
Click or tap the
Level input field to set the trigger level with the pop-up numeric
keypad. You can also use the front-panel trigger level knob or the corresponding
multipurpose knob to set the trigger level. For details, refer to descriptions in
Trigger
Level
. The current trigger level is displayed in the trigger information label at the top
of the screen.
TIP
• To better observe the waveform details in the video signal, you can set a larger memory
depth first.
• In the trigger debugging process of video signals, the frequency in different part of the
signal can be reflected by a different brightness, as RIGOL's digital oscilloscope provides
the intensity graded color display function. Experienced users can quickly judge the
signal quality and discover abnormalities during the debugging process.
8.7.5 Pattern Trigger
The pattern trigger identifies a trigger condition by looking for a specified pattern.
This pattern is a logical "AND" combination of channels. Each channel can be set to H
(high), L (low), or X (don't care). A rising or falling edge (you can only specify a single
Triggering the Oscilloscope
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved. DHO800 User Guide
75
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