I
I
I
I
I
I
I
I
t
Operation
of
the Sync Separator
To
trigger the
4658
on a video signal, perform the
following
three steps:
1. Set the A
TRIGGER
COUPLING switch
to
either
TV
FIELD
or
TV
LINE.
2.
Apply
a suitable Composite Sync
or
Composite Video
waveform
to
the A External Trigger
input
connector.
NOTE
Composite Sync
is
combined Vertical and Horizon-
tal sync
as
a single waveform,
but
without
video
(picture) waveforms. Composite Video
is
the picture
waveform complete with Vertical and Horizontal
blanking and sync.
For
special considerations in Dual Trace modes
(AL
T
and CHOP), refer
to
Vertical Operating
Modes-
Special Considerations in this section.
For
internal
triggering, the sync
portion
of
the displayed
wave-
form
should
be
at least 10 units,
or
0.5 division on
the CCIR graticule;
14
units,
or
about 0.75 division
on the NTSC graticule. For external triggering, the
sync
portion
of
the waveform should
be
at least
75
mV
in amplitude,
or
0.75 V in the
EXT/10
mode. Do
not
exceed the indicated maximum amplitudes (20
divisions
for
internal triggering,
40
volts
for
external
triggering),
to
avoid
circuit
overloads
and
partial
or
complete
loss
of
sync.
3. Select the proper
polarity
for
the video waveform
applied. For normal video
with
sync
at
the negative
peak and positive-going picture information, the A
TRIGGER
SLOPE switch should
be
set
to
minus
(-);
for
inverted video having sync
at
the positive
peaks and peak video (white)
at
the negative peaks,
the SLOPE switch should
be
set
to
plus
(+).The
A
TRIGGER
SLOPE switch controls
an
inverting/non-
inverting signal preamplifier
ahead
of
the sync
separator.
@
465B/DM44
Operators
101
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