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label at the top of the screen, as shown in the figure below. The information will
change based on the trigger settings.
Source Selection
Click or tap Source drop-down button to select CH1-CH4. For details, refer to
Trigger
Source
. The selected trigger source is indicated in the trigger information label at the
top of the screen.
Only when you select the channel that has signal inputs as the trigger source, can you
obtain a stable trigger.
Polarity
In the Polarity item, select the desired polarity: positive polarity ( ) or negative
polarity ( ).
Trigger Condition
Set the trigger condition in the When item.
• When you select "Positive" for polarity, ">" for trigger condition, the oscilloscope
triggers when the positive pulse width of the input signal is greater than the
specified pulse width.
• When you select "Positive" for polarity, "<" for trigger condition, the oscilloscope
triggers when the positive pulse width of the input signal is smaller than the
specified pulse width.
• When you select "Positive" for polarity, "< >" for trigger condition, the
oscilloscope triggers when the positive pulse width of the input signal is greater
than the specified lower limit of pulse width and smaller than the specified
upper limit of pulse width.
• When you select "Negative" for polarity, ">" for trigger condition, the
oscilloscope triggers when the negative pulse width of the input signal is greater
than the specified pulse width.
• When you select "Negative" for polarity, "<" for trigger condition, the
oscilloscope triggers when the negative pulse width of the input signal is smaller
than the specified pulse width.
• When you select "Negative" for polarity, "< >" for trigger condition, the
oscilloscope triggers when the negative pulse width of the input signal is greater
than the specified lower limit of pulse width and smaller than the specified
upper limit of pulse width.
Triggering the Oscilloscope
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DHO1000 User Guide
73
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