Iwatsu DS-8814, Operation Manual

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TV trigger
Displays NTSC or PAL (SECAM). It generates trigger in the selected
field (Both, Odd, Even) or line.
Selects field and horizontal synchronization.
Both:
Triggers by selecting a line number of horizontal sync signal
from vertical odd field or even field.
Odd: Triggers by selecting a line number of horizontal sync signal
from vertical odd field.
Even: Triggers by selecting a line number of horizontal sync signal
from vertical even field.
TV-H: Triggers by a horizontal sync signal.
Specifies a line number in the field selected by Type.
While NTSC is selected: 1 to 525 can be set.
While PAL (SECAM) is selected: 1 to 625 can be set.
Lines can also be set with Coarse in 100 steps.
If the field selected by Type is Odd or Even, the following types can be
set with the Line setting.
Selects a signal source to be triggered.
CH1, CH2, CH3 or CH4 can be set.
Selects a trigger slope plus (Pos) or minus (Neg) of a TV sync signal.
Slope is always performed minus (Neg) when Type is selected TV.
TV trigger
Type
Line
Source
Slope
1 to 263 : Odd NTSC
264 to 525 : Even
1 to 313 : Odd PAL/SECAM
314 to 625 : Even