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@READY
Indicator-LED
illuminates
to
indicate
that
A Sweep
is
"armed"
and
will present a single-sweep
display upon receipt of an adequate trigger signal.
@TRIG
Indicator-LED
illuminates
to
indicate
that
A
Sweep
is
triggered and will produce a stable display.
It
is
useful for setting up
the
trigger circuits when a
trigger signal
is
available
without
a display
on
the
crt
{for example, when using external triggers).
@A
TRIG HOLDOFF
Control-Provides
continuous
control of time between sweeps. Allows triggering on
aperiodic signals {such
as
complex digital words).
In
the
fully clockwise position
{8
ENDS A).
the
A
Sweep
is
automatically terminated
at
the end of
the
8 Sweep
to
provide
the
fastest possible sweep
repetition rate for delayed-sweep presentations and
low-repetition rate signals.
In
this position Holdoff
is
approximately ten times NORM.
Use
the
A trigger
controls for most stable triggering before setting
the
the A TRIG HOLDOFF control
to
a position
other
than NORM.
@ COUPUNG
Switch-Determines
method
used
to
couple signals
to
the trigger generator circuit.
@
465B/DM44 Operators
AC-Signals
are capacitively coupled
to
the
input
of
the
trigger circuit. De
is
rejected, and signals
below
about
30
hertz are
attenuated.
Triggering
is
allowed only on
the
ac portion
of
the vertical
signal.
LF
REJ-Signals
are capacitively coupled
to
the
input
of
the
trigger circuit.
De
is
rejected, and
signals below
about
50
kilohertz are attentuated.
It
is
useful for providing a stable display
of
the
high-frequency
components
of
a complex wave-
form.
HF
REJ-Signals
are capacitively coupled
to
the
input
of the trigger circuit.
De
is
blocked, and
signals below
about
30
hertz and above
50
kilo-
hertz are
attenuated.
It
is
useful for providing a
stable display of
the
low-frequency
components
of
a complex waveform.
DC-AII
frequency
components
of a trigger signal
are coupled
to
the
input
of
the
trigger circuit. It
is
useful for providing a stable display of low-
frequency or low-repetition rate signals.
11
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