Sealey TA4000 - Manual (Page 49)

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Set Trigger System
Set Edge Trigger
The trigger determines when the oscilloscope starts to acquire data and display a wave-
form. When a trigger is set up properly, it can convert unstable displays or blank screens
into meaningful waveforms.
If the oscilloscope wants to acquire a waveform, it collects enough data so that it can
draw the waveform to the left of the trigger point. The oscilloscope continues to acquire
data while waiting for the trigger condition to occur. The oscilloscope continues to ac-
quire enough data so that it can draw the waveform to the right of the trigger point after it
detects a trigger.
The Edge trigger determines whether the oscilloscope finds the trigger point on the ris-
ing or the falling edge of a signal. Select Edge trigger mode to trigger on Rising edge or
Falling edge.
Mode: Select the trigger mode.
Sweep: Set the sweep mode to Auto, Normal or Single.
Auto: Acquires a waveform even if no trigger occurs.
Normal: Acquires a waveform when a trigger occurs.
Single: Acquires a waveform when a trigger occurs then stops.
Source: You can use the trigger source options to select the signal that the oscilloscope
uses as a trigger. The source can be any signal connected to a channel BNC, or to the
EXT. BNC.
Original Language Version TA4000 Issue: 1 - 06/09/11