Specifications

READY lndicator-LED illuminates
to
indicate
that
A
Sweep is
"armed"
and
will
present
a single-sweep
display upon
receipt
of an adequate trigger signal.
TRIG
lndicator-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). ln
the
fully
clockwise
position
(A
ENDS
A), the A
Sweep
is
automatically terminated at the
end
of
the
B
Sweep
to
provide
the
fastest
possible
sweep
repetition rate for
delayed-sweep
presentations
and
low-repetition rate
signals. ln
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.
COUPLING Switch-Determines
method used
to
couple
signals to the trigger
generator
circuit.
AC-Signals
are capacitively coupled to the
input
of the trigger
circuit. Dc 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.
Dc 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.
Dc is
blocked, and
signals below
about 30
hertz
and above 50 kilo-
hertz
are attenuated. lt is useful for
providing
a
stable display of the low-frequency
components of
a
complex waveform.
DC-AIl
frequency
components of
a trigger signal
are
coupled
to the input of the trigger
circuit. lt is
useful
for
providing
a stable
display of
low-
frequency
or
low-repetition
rate
signals.
11
@
4658/DM44
Operators