GW Instek GDS-1000A Series User Manual - Manual (Page 81)

CONFIGURATION
81
Trigger
The Trigger function configures the conditions by which the
oscilloscope captures the incoming signals.
Trigger type
Edge Triggers when the signal crosses an amplitude
threshold in either a positive or negative slope.
Video Extracts a sync pulse from a video format signal
and triggers on a specific line or field.
Pulse Triggers when the pulse width of the signal
matches the trigger settings.
Indicators Edge/Pulse
(CH1, Edge, Rising edge,
DC coupling)
Video
(CH1, Video, Positive
polarity, NTSC standard)
Trigger parameter
Trigger source CH1, 2 Channel 1, 2 input signals
Line AC mains signal
Ext External trigger input
signal
Trigger mode Auto The oscilloscope updates the input signal
regardless of the trigger conditions (if
there is no trigger event, the oscilloscope
generates an internal trigger). Select this
mode especially when viewing rolling
waveforms at a slow timebase.