867B/863
Users Manual
5-4
Setting Up the Trigger
Time
>
Base
>
Trigger
Single
>
Shot
Glitch
>
Capture
Full
Auto
Select “Trigger” (
2
) from the View Mode
Softkeys, then use the Trigger Softkeys as shown in
the following paragraphs.
Selecting the Trigger Slope
K
Slope
t
Slope
[]
Internal
External Exit
1
(Slope) sets the waveform trigger to trip either
on the rising or falling edge of the signal for single
triggering. The counter triggering still use two (dual)
triggers for its operation and are set automatically
based on the input signal amplitude. In dual
triggering,
1
selects between the rising and
falling slope trigger points to allow their levels to be
set individually. The waveform trigger icon will switch
between two trigger points in the display as
1
selects each trigger. The rising slope setting will
always have a more positive setting than the falling
slope setting. However, whichever slope is left
selected will be the last criteria to be met before a
trigger occurs, e.g., if the rising slope selection is left
highlighted, the input signal must pass through the
falling slope first and then through the rising slope to
trigger the GMM. In single trigger, Full Auto will
always set the trigger slope to rising.
The GMM trigger circuitry controls both the
waveform and counter displays. The counter always
uses a dual trigger setting while the waveform
display can be controlled by single or dual triggering.
The waveform trigger setting(s) are indicated in the
display with an icon in the left margin along the
vertical axis of the display grid (Figure 5-2). The
counter trigger settings are indicated by the two
icons along the right vertical axis and are marked
with “Hz”. The counter and waveform trigger settings
are the same when in Dual trigger operation. This is
the only condition where the counter trigger levels
are manually set.
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