Metric Halo SpectraFoo - Manual (Page 42)

Instruments
42
Figure 3.43: Oscilloscope controls
Each oscilloscope can trigger and hold the wave form of the signal being monitored. There are seven available
trigger modes:
Table 3.2. Trigger modes
Trigger Mode Behavior
Free automatically retriggers on the internal clock
Normal triggers the drawing trace once channel input match-
es your trigger settings
Hold triggers a drawing trace and holds the signal until
rearmed
Hold and Retrigger same as Hold, but the trigger is automatically
rearmed
Timed Hold same as Hold, but the trigger is automatically
rearmed after the desired “retrigger time”
Polarity Check same as Hold, but displays all the data prior to the
trigger point and triggers on either polarity and either
slope
Timed Polarity Check rearms after the desired “retrigger time”
Clip Capture same as Polarity Check but triggers when signal
reaches full scale
Timed Clip Capture rearms after the desired “retrigger time”
The Trigger Level slider sets the trigger threshold level in percent of full scale. 0 represents -∞ dBFS. When the
slider is to the right of 0 the scope will trigger on the positive portion of a full scale signal; when it is to the
left it will trigger on the negative portion of a full scale signal.
The Retrig Time slider controls the amount of time that the system waits before retriggering when a "Timed"
mode is selected.