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Source Selection
Click or tap Source drop-down button to select CH1-CH4. For details, refer to
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
Selects the pulse polarity of Runt trigger under the Polarity item.
•
Positive
•
Negative
Trigger Condition
Sets the Runt trigger condition in the When item.
•
None: indicates not setting the trigger condition of Runt trigger.
•
>: triggers when the runt pulse width is greater than the lower limit of pulse
width. Click or tap the input field of Lower to set the minimum pulse width of
Runt trigger with the pop-up numeric keypad. You can also use the
corresponding multipurpose knob to modify the value.
•
<: triggers when the runt pulse width is smaller than the upper limit of pulse
width. Click or tap the input field of Upper to set the maximum pulse width of
Runt trigger with the pop-up numeric keypad. You can also use the
corresponding multipurpose knob to modify the value.
•
< >: triggers when the runt pulse width is greater than the lower limit and
smaller than the upper limit of pulse width. Click or tap the input field of Upper
to set the maximum pulse width of Runt trigger with the pop-up numeric
keypad. Click or tap the input field of Lower to set the minimum pulse width of
Runt trigger with the pop-up numeric keypad. You can also use the
corresponding multipurpose knob to modify the maximum and minimum pulse
width. The lower limit of the pulse width must be smaller than the upper limit.
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
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: triggers on the positive runt pulse.
: triggers on the negative runt pulse.
Triggering the Oscilloscope
Trigger
Trigger Level
HDO4000 User Guide
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