Triggering the Oscilloscope 4
6000 Series Oscilloscope User’s Guide 141
The channel you select is shown in the upper-right corner of
the display next to the polarity symbol.
The source can be any analog or digital channel available on
your oscilloscope. External trigger may also be specified as a
source when using a 2-channel oscilloscope.
Adjust the trigger level for the selected analog channel by
turning the Trigger Level knob. Press the D15 Thru D0 key and
select Thresholds to set the threshold level for digital
channels. The value of the trigger level or digital threshold is
displayed in the upper-right corner of the display.
3 Press the pulse polarity softkey to select positive ( )or
negative ( ) polarity for the pulse width you want to
capture.
The selected pulse polarity is displayed in the upper-right
corner of the display. A positive pulse is higher than the
current trigger level or threshold and a negative pulse is
lower than the current trigger level or threshold.
When triggering on a positive pulse, the trigger will occur on
the high to low transition of the pulse if the qualifying
condition is true. When triggering on a negative pulse, the
trigger will occur on the low to high transition of the pulse if
the qualifying condition is true.
4 Press the qualifier softkey (< > ><) to select the time
qualifier.
The Qualifier softkey can set the oscilloscope to trigger on a
pulse width that is:
• less than a time value (<).
For example, for a positive pulse, if you set t<10 ns:
• greater than a time value (>).
Trigger
10 ns
10 ns
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