Video Trigger; Alternate Trigger - Tenma 72-2650 User Manual

Video Trigger

• By selecting video trigger you can carry out field or line trigger with NTSC or PAL
standard video signals. Default trigger coupling is DC.
Functions Menu
Type
Trigger source
Standard
Synchronisation
• When PAL is selected for STANDARD format and
SYNCHRONISATION mode is LINE you will see a
screen display similar to this:-
• When SYNCHRONISATION mode is FIELD you will
see a screen display similar to this:-

Alternate Trigger

• When alternate trigger is selected the trigger
signal will be present in two vertical channels. This
triggering mode is suitable for observing two signals
of unrelated signal frequencies.
Setup
Video
CH1 Set Ch1 as the trigger signal
CH2 Set CH2 as the trigger signal
EXT Set the external trigger input channel as the trigger signal
EXT/5 Attenuate the external trigger source 5 times as the trigger
signal
AC Line Set AC power line as trigger signal
PAL Suitable for video signals of low black level
NTSC Suitable for video signals of high black level
All lines Set the TV line to synchronise with trigger
Specified Set synchronised trigger on the specified line and adjust by
lines turning the control on the front panel
Odd field Set video odd field to synchronised trigger
Even field Set video even field to synchronised trigger
Notes
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