CONTROLS AND INDICATORS
TRIGGER SOURCE CONTROLS
(32)SOURCE
This control selects
the
source
for the A
Sweep Trigger.
V MODE
The
trigger source
for the A
Sweep
is
determi-
ned
by the
Vertical MODE setting.
CH1
CH1 signal
is
used
as a
trigger source
CH2
CH2 signal
is
used
as a
trigger source
ADD
The algebraic
sum of CH1 and CH2
signals
isured
a
signal source,
(if CH2 has
been
inverted,
the
difference becomes
the
source.)
DUAL
QUAD
(ALT)
(CHOP)
For
ALT
mode
the
signals
for
CH1 through
CH4 alternate
as the
trigger source.
For the
CHOP mode
the
chopping signal becomes
the
trigger source.
— CAUTION:
.
1
When
the
vertical
MODE
is
selected
in
CHOP,
the
display cannot
be
synchronized with
the
input
signal since
the
chopping signal becomes
the
trigger source.
2.
Triggering
is
impossible when input signals
are not
applied
to all
channels with
the
vertical axis mode
set to
DUAL
or
QUAD.
CH1
CH1
signal
is the
trigger source
for the A
Sweep.
CH2
CH2
signal
is the
trigger source
for the A
Sweep.
1/1
CH3
signal
is the
trigger source
for the A
Sweep.
1/10
The
CH3 signal, attenuated
to
1/10
of its
true
value
is the
trigger source
for the A
Sweep.
(34) LEVEL/SLOPE PULL
FIX
LEVEL
This outer control adjusts
the
level
at
which
the A
trigger
causes
the A
Sweep
be
started.
SLOPE PULL
FIX
This inner control adjusts
the
slope
of the A
trigger signal.
When
the
control
is
pulled
out the FIX
mode
is
selected
for
auto level adjustment, under which circumstances outer
TRIG LEVEL control
no
longer
has any
effect.
(35) TRIG'D
This green
LED
lights when
the A
trigger source signal
cau-
ses
the
initiation
of a A
Sweep.
It
lights
for X-Y
operation
as
well.
(36)
CH3 or A EXT
TRIG
Input connector
for the CH3
signal.
It
serves also
as the
external
A
TRIG input connector.
CH3
signal
may be ob-
served simultaneously with
CH 1, 2 and 4
signals when
the
QUAD mode
is
selected.
When
the
SOURCE control
is set to
either
EXT (CH3) 1/1
or
1/10, the
trigger source
is
this input signal.
(37) SOURCE
This control selects
the B
Sweep trigger source.
CH1
CH1
signal
is the
trigger source
for the B
Sweep.
CH2
CH2
signal
is the
trigger source
for the B
Sweep.
1/1 CH4
signal
is the
trigger source
for the B
Sweep.
1/10
The CH4
signal, attenuated
to 1/10 of its
true
value
is the
trigger source
for the B
Sweep.
(33)COUPLING
This control
is
used
to
select
the
SYNC coupling
for the A
trigger.
AC SYNC signal
is AC
coupled with
any DC
com-
ponent blocked.
LFREJ
SYNC signal
is
coupled through
a
high-pass
fil-
ter
to
eliminate
low
frequency components
for
stable triggering
of
high frequency signals.
HFREJ
SYNC signal
is
coupled through
a
low-pass
fil-
ter
to
eliminate high frequency components
for
a stable triggering
of low
frequency signals.
DC
The
SYNC signal
is DC
coupled
for
SYNC
which includes
the
effects
of DC
components.
For
CH3 and CH4, the
vertical position
adjustment
has no
effect
on the
trigger point.
VIDEO
For
synchronization
of
video signals.
The
posi-
tion
of the A
SWEEP TIME/DIV control deter-
mines whether FRAME
or
LINE
is to be
syn-
ced.
Settings between
0.5s and 0.1 ms
result
in FRAME while those between
50 /is and 20
ns result
in
LINE sync.
(38) COUPLIIMG
This control selects
the
SYNC coupling
for the B
trigger
group. Operation
is
similar
to
that
of the
corresponding
A
Sweep trigger coupling select control except that VIDEO
is
not available.
(39) LEVEL/SLOPE PULL STARTS AFTER DELAY
LEVEL
This outer control adjusts
the
level
at
which
the B
trigger
signal causes
the
start
of the B
Sweep.
SLOPE PULL STARTS AFTER DELAY
This control selects
the
slope
of the B
trigger signal.
For B
trigger operation
it
must
be set in its
pushed
in
position.
When
it is
pulled
out, the B
Sweep starts immediately after
the delay time selected
by the
DELAY TIME MULTIPLIER
and
A
SWEEP TIME/DIV control, regardless
of the
TRIG
LEVEL setting. Even when this switch
is in
position with
the TRIG MODE
set to
AUTO, turning
the
LEVEL (outer
knob) fully clockwise
or
counterclockwise release
the
trigger
and set the
unit
to B
START AFTER DELAY opera-
tion.
3-4
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