Specifications

oPTloN
05
TV
SYNC
SEPARATOR
The
information
and instructions
presented
in this
part
apply only
to
use
of
the
4658
Option
05
instrument
in
TV
applications.
GENERAL
INFORMATION
Option 05
provides
the
instrument
with
front-panel
selection
of additional
processing
of
trigger
signals
to
facilitate observation
and
measurement
of
composite
video and
related television
waveforms.
Added
circuits
provide
amplification,
selectable
polarity
inversion,
clip'
ping,
and
vertical-sync
recognition.
Two
positions
are
added
to
the
A TRIGGER
COUPLING
switch:
TV
FIELD
and
TV LINE.
When the
A
TRIGGER
COUPLING
switch
is set
to
TV
FIELD or
TV
LINE,
the
A
TRIGGER
SOURCE
switch
selects
the
source
of
signals to
be
processed
in the Sync
Separator.
This
includes
NORM
(composite
vertlcal signal),
CH
1
,
CH
2,
EXT,
or
EXT/I0
(LINE
source
is
not a
usable
function
with
TV
FIELD or
TV LINE
coupling).
When
the
A TRIGGER
COUPLING
switch
is set
to
TV
FIELD
or
TV
LINE,
the output
of
the
Sync
Separator
is
automatically
applied
to the
A Sweep
Trigger
circuits,
and
only
this signal
may be
used
for triggering the
A
Sweep.
For B Sweep,
the
horizontal sync signal
(line-rate
sync)
from the
Separator
is
fed
only to
the TV
LINE
position
on
the
B
TRIGGER
SOURCE
switch,
which may
be selected
at
the option
of the
user.
The Option
05
circuitry
may be
operated
either
from
normal sync-negative
composite
video
(with
the
A TRIG-
GER
SLOPE
switch
at
-)
or
from inverted
video
(SLOPE
switch
set
to
+).
This applies
to
most standard
broadcast
systems
using
from
405
to 819
lines,50
or
60
Hz
field
rates or
to
closed-circuit
systems
using
up
to
1201
lines and
60
Hz
field rates.
To optimize
video
measurements,
the
vertical amplifier
AC
input
coupling
capacitors
are
increased
from 0.02
to
O.2
1tF.
The
larger
physical
size
of these
capacitors
increases
the
input shunt
capacitance,
which
is normalized
at 24
pF.
@
98
4658/DM44
Operators