T3DSO2000A Manual. Page 54
15.4 Trigger Mode
The trigger mode determines how the oscilloscope acquires waveforms.
Auto
：
An internal timer triggers the sweep after a preset timeout period if no trigger has
been found, so that the oscilloscope continuously updates the display whether a trigger
happens or not. Auto mode is suitable for
unknown signals or DC signals.
Note
: In Auto mode, if the signal satisfies the trigger conditions but cannot trigger the
oscilloscope stably, it may be that interval between two trigger events exceeds the
timeout period. Try Normal mode in this case.
Normal
：
Triggers and acquisitions only occur when the trigger conditions are met.
Otherwise, the oscilloscope holds the last waveform on the display and waits for the
next trigger. Normal mode is suitable for acquiring:
•
Only events specified by the trigger settings
•
Rare events
Single
：
Captures and displays a single frame which satisfies the trigger conditions,
and then stops. The following trigger events are ignored until the Single acquisition is
restarted. Single-mode is suitable for:
•
One-shot events or periodic signals, such as power-on\off waveforms on a power rail
•
Rare events
15.5 Trigger Type
15.5.1 Overview
The trigger modes of the T3DSO2000A are digital designs. Compared with analog
trigger circuits, digital triggers can not only greatly optimize trigger precision, trigger
jitter, but also support multiple trigger types and complex trigger conditions.
Edge-- Trigger on a rising edge, falling edge or both
Slope-- Trigger when an edge crosses two thresholds which lie inside or
outside a selected time range
Pulse--Trigger at the end of a pulse when the pulse width lies inside or
outside a selected time range
Video--TV trigger on falling edge
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