Triggering
the
Sweep
The
output
of
the Sync Separator
is
fed directly
to
the
A Sweep Trigger circuit;
all
that
is
required for triggering
is
the proper setting
of
the A TRIGGER LEVEL control.
To trigger the B Sweep from the Line-rate trigger
output,
perform the following steps:
1. Make sure
the
A Sweep
is
running.
NOTE
The 8 Sweep cannot be operated independently and
cannot run more than once per operation
of
the A
Sweep. For Composite line displays, refer to Special
Measurements in this section.
2. Set the B TRIGGER SOURCE switch
to
TV LINE.
3. Set the B TRIGGER LEVEL control for a stable
triggered sweep.
Vertical
Operating
Modes-Special
Considerations
DUAL TRACE MODES. For dual trace operation,
the
Sync Separator input must be taken from
CH
1,
CH
2,
or
an external source. (When only one trace
is
displayed,
the
NORM position
of
the A TRIGGER SOURCE switch may
be used.) The Sync Separator
is
not
capable
of
correct
processing
of
switched (composite vertical deflection) wave-
forms present on the NORM bus
in
the AL T
or
CHOP
modes; it
is
therefore
not
possible
to
obtain stable
simultaneous displays
of
two
independent video signals
that
are
not
time-related.
SINGLE CHANNEL TRIGGERING. When triggering
from Channel 1
or
Channel 2,
the
waveform fed
to
the
Sync Separator
is
the same (except for positioning)
as
that
displayed on-screen when
the
channel
is
turned on.
If
the
VOL TS/D
IV
V
AR
control
is
used
to
reduce displayed
amplitude,
the
signal
to
the Sync Separator
is
also reduced.
When the Channel 2 INVERT switch
is
pushed in, the
CH
2
signal
to
the A TRIGGER SOURCE switch
is
also
in-
verted. Therefore,
in
selecting the position
of
the A TRIG-
GER SLOPE switch
in
internal triggering, it
is
only
necessary
to
note
the polarity
of
the displayed waveform,
disregarding its actual polarity
as
applied
to
the Vertical
input connector. For external triggering,
the
actual applied
polarity will determine the necessary A TRIGGER SLOPE
setting.
102
4658/DM44
Operators
@
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