Specifications

Selecting
an
lndividual
Line
NOTE
For
fietd and
line identification
systems,
refer to
tdentifying
Fields,
Frames, &
Lines
in 525/60
and
625/50
TV
Systems
at the
end of
this
section.
The
Sync
Separator
circuit
does
not differentiate
be-
tween
the
two
fields
of an
interlaced
frame or among
the
four
fields of
the
PAL color
frame sequence.
However,
if a
1%
or
3%
field basic
A Sweep
cycle
is
used, the
sweep
will
remain
stably
locked
to a
given
display
until the signal
is
interrupted.
ONE
FRAME
CYCLE.
To display
an
entire
vertical
blanking
interval
and
locate a specific
line
(e.9.,
one
of the
lines
containing
a
specific
VIT
waveform),
set
the A
TIME/
DIV
switch
to
2
ms
and
the
B
TIME/DIV
switch
(pull
to
unlock
from A)
to
10
ps.
Use
the
Horizontal
POSITION
control
to
center
the second
vertical
blanking
interval
to
center-screen
and
depress
the
10X
MAG
pushbutton.
This
will
provide
sufficient
resolution
to
identify
the
field.
Adjust
the A
TRIGGER
HOLDOFF
as
necessary.
lf the
displayed
field is
not the
desired
one,
first rotate
the
A
TRIGGER
SLOPE
control
momentarily
to
the
opposite
polarity
then
rotate back
again
until the
start of
the desired
field is displayed.
PrESS A
INTEN
ANd
USC thE
DELAY
TIME
POSITION
control
to
position
the
intensified
zone
(B
Sweep)
on the
desired
line.
Pressing
the B
DLY'D
button
will then
display
the desired
line.
Select
ALT
Horizontal
Display
if
you
wish
to
view the
A INTEN
trace
and
B DLY'D
trace
simultaneously.
TWO
FRAME
CYCLE.
lf
PAL burst blanking
is to be
checked, an A
Sweep
3%-field
cycle
(5
ms/div,
with the A
TRIGGER
HOLDOFF
at about
four
o'clock)
is required,
using B Sweep
(ALT
mode recommended)
to
identify
fields and
lines.
At
5
ms/div, only two
and a
fraction
fields
will
be displayed
with a
full
field
covered
by the trigger
holdoff interval.
To
put
a specific
field on-screen
in a
particular
location
will
typically
require several
operations
of the A TRIGGER
SLOPE switch.
@
104
4658/DM44
OPerators