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Triggering the Oscilloscope
8.2
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DHO1000 User Guide
External trigger input
The external trigger source can be used to trigger on the fifth channel while all the
other four channels are acquiring data. The trigger signal (e.g. external clock or signal
of the circuit under test) will be connected to EXT trigger source via the external
trigger input terminal [EXT TRIG] connector. You can set the trigger conditions within
the range of the trigger level (from -8 V to +8 V).
Trigger Level
Trigger level determines where on the selected edge the trigger point occurs. The
adjustment of the trigger level is related to the type of the trigger source.
•
When the trigger source is CH1-CH4, rotate the front-panel
use the corresponding multipurpose knob (when the trigger menu is opened) to
adjust the trigger level. You can also click or tap the Level input field to set the
value with the pop-up numeric keypad. During the adjustment, a trigger level
line (the color of the trigger level line is the same as that of the channel) and a
trigger icon "
with the variation of the trigger level. When you stopping modifying the trigger
level, the trigger level line disappears in about 2 s. The current trigger level is
displayed in the trigger information label at the top of the screen.
In Runt Trigger, Slope Trigger, and Window trigger, you need to set the upper
and lower limits of the trigger level. Two trigger level icons
displayed at the right section of the screen.
•
When the trigger source is AC Line, there is no trigger level.
•
When the trigger source is EXT, rotate the front-panel
corresponding multipurpose knob (when the trigger menu is opened) to adjust
the trigger level. You can also click or tap the Level input field to set the value
with the pop-up numeric keypad. The current trigger level is displayed in the
trigger information label at the top of the screen.
For this trigger source, only the variation of the trigger level value is displayed
on the screen during the adjustment of the trigger level, without displaying the
trigger level lines on the screen.
To better trigger the waveforms, for a trigger with a single level, you can directly click
or tap 50% in the menu or press the trigger level knob to make the level move to the
middle of the waveform. However, for a trigger with two levels (e.g. Slope trigger,
Runt trigger, Window trigger), you need to click or tap 90% for Level A and 10% for
Level B to make the level move within the range of the waveform amplitude.
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