A
TRIG
MODE
A
TRIG
HOLDOFF
External Trigger
Input
(not
labeled)
A
and
B
Sweep
DELAY-TIME
POSITION
®
Determines
the
operating
mode
for
the
A Trigger Circuit.
AUTO: With
the
proper
trigger
control
settings, A Sweep can be
initiated by signals
that
have
repetition
rates above
about
20
hertz
and
are
within
the
fre-
quency
range selected by
the
COUPLING switch.
In
the
ab-
sence of an
adequate
trigger
signal or when
the
trigger con-
trols
are misadjusted,
the
sweep
free-runs
to
produce
a reference
trace.
NORM: With
the
proper
trigger
control
settings, A Sweep can be
initiated by signals
that
are with-
in
the
frequency
range selected
by
the
COUPLING switch.
In
the
absence
of
an
adequate
trig-
ger signal
or
when
the
trigger
controls
are misadjusted,
there
is
no
trace.
SING SWP: After a sweep
is
dis-
played,
further
sweeps
cannot
be
presented
until
the
SING
SWP
pushbutton
is
pressed again.
The
display
is
triggered
the
same
as
for
NORM
operation
using
the
A
Triggering
controls.
Provides
control
of
holdoff
time
between
sweeps
to
obtain
stable
displays
when
triggering
on
aperi-
odic
signals (such as
complex
digital
words). Variable can increase hold-
off
time
up
to
at
least
10
times
the
holdoff
time
of
the
NORM posi-
tion.
In
the
B ENDS A position
(fully clockwise),
the
A sweep
is
reset
at
the
end
of
the
B sweep
to
provide
the
fastest possible sweep
repetition
rate
for
delayed sweep
presentations.
Input
connectors
for external trig-
ger signals.
Provides variable sweep delay be-
tween
0.20
and
10.20
times
the
delay
time
indicated by
the
DELAY
TIME
switch.
A AND B
TIME/
DIV AND DELAY
TIME
VAR
UNCAL
Operating
lnformation-465
A
TIME/DIV
switch (clear plastic
outer
flange) selects
the
sweep rate
of
the
A sweep
circuit
and selects
the
basic delay
time
(to
be multi-
plied by DELAY-TIME POSITION
dial setting) for delayed-sweep
operation.
B TIME/DIV switch
(inner
dark
knob)
selects sweep rate
of
the
B sweep
circuit
for delayed
sweep
operation
only.
VAR control
must
be
in
calibrated
detent
for
calibrated A sweep rates.
Provides
continuously
variable A
sweep rates
between
the
calibrated
settings
of
the
A
TIME/DIV
switch.
The A sweep rate
is
calibrated when
the
VAR
control
is
fully clockwise
into
the
calibrated
detent.
Light
that
indicates
when
the
VAR
TIME/DIV
control
is
out
of
the
calibrated
detent
and
the
horizontal
sweep rate
is
uncalibrated.
X10
MAG
Indicator Light
that
indicates when
the
X10
MAG
is
turned
on.
READY Light
that
indicates
that
A Sweep
has been
prepared
to
present a
single sweep
upon
receipt
of
an
adequate
trigger signal.
HORIZ DISPLAY Selects
the
horizontal
mode
of
op-
eration.
A: Horizontal deflection provided
by A Sweep. B Sweep inopera-
tive.
MIX:
The
first
part
of
the
hori-
zontal sweep
is
displayed
at
a
rate
set
by
the
A TIME/DIV
switch and
the
latter
part
of
the
sweep
at
a rate
set
by
the
B
TIME/DIV
switch. Relative
amounts
of
the
display allocated
to
each
of
the
two
rates are
determined
by
the
setting
of
the
DELAY-TIME POSITION dial.
A INT: Displayed sweep rate deter-
mined by
the
A TIME/DIV
switch.
An intensified
portion
appears
on
the
display during
the
B sweep
time.
This switch
position provides a
check
of
the
duration
and position
of
the
B
sweep (delayed sweep) with
respect
to
the
delaying sweep
(A).
2-5
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