Operating
Instructions—7A42
is
HI.
An adjustment
of
the
time-base
Holdoff
control
may
be
necessary
for
obtaining
a
stable
display.
Set
the
time-base
Holdoff
control so
that
the
display
is
double
triggered. A stable
trace
can now be obtained
by
using
the
7A42 TRIGGER
FILTER
control.
Rotate
the
TRIGGER
FILTER control
48
clockwise
until
the
narrower
of
the
two
TRIGGER
VIEW
pulses
49
disappears
50.
Now
vary
the
time-base
Holdoff
control
and
notice that
the
display
50
is
always
stable.
Return
the
TRIGGER
FILTER
control
to
the
OFF
(counterclockwise
detent)
position.
2-43