Triggers; Trigger Setup Menu - Snap-On ZEUS User Manual

Scope and Multimeter Operations

8.65 Triggers

Triggers are only available in the lab scope function.
A trigger can be used to stabilize a changing or erratic signal (a signal that may
flicker or drift as it refreshes), so that it is easier to view or diagnose. This
stabilization effect is accomplished by basically displaying the same part of the
trace repeatedly from the same starting point, thus the flicker or drift is minimized.
A trigger is basically a "specific point" on the display, at which a trace will start to
display (start the sweep) if it crosses that point.
The trigger feature allows you to set the conditions of that "specific point" also called
a "trigger point". When the trigger conditions are set, and a trace "meets" those
conditions (crosses the trigger point), the trace will start.
Trigger conditions:
Vertical scale position (amplitude)
•
Sweep position - the horizontal scale position, or position in time
•
Slope direction - the direction the trace must be moving (up/rising or positive)
•
or (down/falling or negative) when crossing the trigger point.
NOTES
Triggers can be set on any channel, however only one trigger can be activated
(used) at a time.
If a trigger is set outside the range of the scales, a yellow marker (e.g. arrow
with plus symbol) will be displayed indicating the trigger is out of range and a
confirmation screen will display.
When a trigger is set on a channel, and more than one channel is active
(displayed), trigger conditions must be met for that channel in order to display
all the other channels.
The trigger point is indicated by a plus marker (+) on the scope grid. The trigger
marker sign can be dragged across the grid with the stylus to roughly position it.
The trigger setup menu allows you to precisely position the trigger. See
Operation on page 119.

8.65.1 Trigger Setup Menu

To access the trigger setup menu:
Select the Trigger Setup Menu icon from the control panel, or
•
from the upper toolbar select Setup > Trigger
•
1. Source:
- Trace 1 to 4—sets the trigger for the applicable channel.
- Cylinder—sets triggering to the firing of a cylinder detected by the
optional RPM Pickup or Secondary Ignition Adapter.
- None—switches triggering off.
2. Mode—sets the method of triggering:
- Auto—see
- Manual—see
3. Slope—sets triggering to the rising (top icon) or falling (lower icon) slope of the
signal waveform.
4. Vertical—sets the vertical trigger position
5. Horizontal—sets the trigger timing position (left and right on the grid)
Trigger
6. Back—closes Trigger Setup Menu
118
Trigger Auto/Manual on page 119
Trigger Auto/Manual on page 119
Figure 8-45 Trigger setup menus

Triggers