Specifications

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
Venical and Horizon-
tal sync as a
single
waveform, but
without
video
(picture)
waveforms.
Composite
Video is
the
picture
waveform complete
with Venical and Horizontal
blanking and sync.
For
special considerations in
Dual Trace modes
(ALT
and CHOP),
refer
to Vertical
Operating Modes-
Special Considerations
in
this
section.
For
internal
triggering, the sync
portion
of the displayeil 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/I0
mode. Do
not exceed
the indicated
maximum
amplitudes
(20
divisions
for
internal triggering, 40 volts for external
triggering), to
avoid
circult
overloads
and
partial
or
complete loss
of sync.
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
(+).
ttre R
TRIGGER
SLOPE switch
controls
an inverting/non-
inverting
signal
preamplifier
ahead
of the sync
separator.
3.
@
4658/DM44
Operators 101