MOTU UltraLite-mk3 - Hybrid FireWire/USB 2.0 Audio & MIDI Interface - Manual (Page 91)

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Enabling the Magnitude check box tells the trigger
to look for both positive and negative Level values,
regardless of whether the Level value is positive or
negative. For example, if Level is set to +0.500 and
Magnitude is enabled, the trigger will look for both
+0.500 and -0.500. You will see a second blue line
appear in the display when
Magnitude is enabled to
denote the second value.
Holdoff
Holdoff defines a time interval during which the
oscilloscope does not trigger. The most recent trace
will be displayed during that period. When the
period is over, the trigger is “re-armed’, i.e. it will
begin looking for the criteria again.
Click and drag this value up or down to set it, or
double-click to return to the default value.
Trigger modes
The Trigger menu (Figure 10-37 on page 90)
provides four modes:
Trigger indicator
The Trigger indicator (Figure 10-37 on page 90)
displays the state of the trigger, and also provides a
way to manually interact with it. The Trigger
indicator always displays one of three colors:
You can also click on the Trigger indicator to force
certain actions, depending on the Trigger mode. In
Auto and Normal modes, clicking on the Trigger
indicator causes the display to run freely; you may
click & hold to force this to occur for as long as
you’d like. In Single Sweep mode, clicking on the
Trigger indicator re-arms the trigger. When the
Trigger mode is
None, clicking on the Trigger
indicator has no effect.
Measurement information
You can view detailed information about a
particular time range by using the measurement
bars.
Figure 10-38: Measurement information
Trigger mode What it does
None The Trigger is not active; this is the default mode.
The incoming audio signal will be displayed con-
tinuously as audio is received.
Auto The display is always updating, but when the
condition is met, the trigger event will be dis-
played centered around the line marking time
equals zero.
Normal The display updates only when the condition is
met; the last trace will be displayed until the next
matching event is found.
Single Sweep Similar to Normal mode, but the last trace will be
displayed until you manually arm the trigger by
clicking the Trigger indicator (Figure 10-37 on
page 90) or by pressing the spacebar.
Color Status
Green When the current Trigger criteria has been met
(including when the Trigger mode is
None ).
Yellow When the Trigger is armed, but has not yet found an
event which matches its criteria. Yellow can also indi-
cate that the graph has been manually paused using
the Pause button in the View section (see “Pausing
the display” on page 89).
Red When the Trigger is being held off, either because the
Trigger mode is set to Single Sweep or the Holdoff
time is not set to zero.