Operation
To trigger at a specific video line:
1 . Select a composite video signal
as
the trigger source.
2.
Select
FLD1, FLD2,
or AL T coupling.
3.
Set SLOPE to the polarity of the
sync.
4.
Turn
FLO
LINE
# (t.) to the desired
line
number.
When
you
increment or decrement the
line
number outside the range of the
selected field,
the
other field
is
automatically selected.
With
AL
T field coupling, the
line
number
is
referred to the beginning of both
fields.
To compare two video signals with the same format that
are
not perfectly
synchronized,
such
as
from a camera
and
a
VCR
or from the input
and
output of a
time
base
corrector:
1.
Display the signals
on
CH
1
and
CH
2,
with Alt Vertical mode.
2.
Select
VERT
Trigger Source,
and
AL T field trigger coupling.
3.
The
CH
1 display triggers
on
field 1
and
the
CH
2 display triggers
on
field
2.
TV
Lines trigger coupling with multiple vertical channels, Alt Vertical
mode,
and
Vert Trigger source produces unpredictable results.
A "t." symbol with the line number display shows when the t./FLD
LINE
#
control
can
change the
line
number. If t.V, t.t, or
1/M
is on, press a trigger
Coupling button to redirect the control to line number selection. Press t. V or t.t
to redirect the control to cursor or delay adjustment.
The
first push redirects the
control. A second push will change the t. function or trigger coupling.
If
you magnify the vertical display beyond the graticule, the trigger
may
be
degraded. To avoid trigger overload,
use
one
channel for display
and
another
channel with
an
appropriate video signal
as
the trigger source. A composite
sync
signal
can
be
used
for the trigger source
as
well
as
composite video.
2465A/2455A/2445A Operators
2-7
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