Operating Instructions-Type
453
/ R453
STEP
ATTEN
BAL
INPUT
MODE
DC:
All
components of the input signal are
passed to the Vertical Deflection System.
Screwdriver adjustment to balance
Verti-
cal Deflection
System
in
the
5,
10
and
20
mV
positions of the
VOLTS/DIV
switch.
Vertical input connector for signal.
Selects vertical mode of operation.
CH
1:
The
Channel 1 signal
is
displayed.
CH
2:
The
Channel 2 signal
is
displayed.
ALT:
Dual
trace display of signal on both
channels. Display switched
at
end
of
each sweep.
CHOP:
Dual
trace display of signal on
both channels. Approximately
one·-mi-
crosecond segments
from
each channel
displayed
at
a repetition rate of about
500
kilohertz.
ADD:
Channel 1 and 2 signals are alge-
braically
added
and the algebraic
sum
is
displayed on the
CRT.
TRIGGER
Selects source of internal trigger signal
from
vertical system.
NORM:
Sweep circuits triggered
from
dis-
played channel(s). Channel 1 signal
available
at
CH
1
OUT
connedor.
CH
1
ONLY:
Sweep circuits triggered only
from
signal applied
to
the Channel 1
INPUT
connector. No signal available
at
CH
1
OUT
connector.
CH
1 lights,
located beside A and B
SOURCE
switch-
es
indicate when the
TRIGGER
switch
is
in
the
CH
1
ONLY
position.
INVERT
(CH
2 Inverts the Channel 2 signal when pulled
only)
out.
A and B Triggering (both where applicable)
EXT
TRIG
INPUT
SOURCE
2-4
Input connector for external trigger signal.
Connector
in
B Triggering section of front
panel also serves as external horizontal
input when
HORIZ
DISPLAY
switch
is
in
EXT
HORIZ
position and B
SOURCE
switch
is
in
EXT
position.
Selects source of trigger signal.
INT:
Internal trigger signal obtained
from
Vertical Deflection System. When
CH
1 light
is
on, trigger signal
is
obtained
only
from
the Channel 1 input signal;
when the light
is
off,
the trigger signal
is
obtained
from
the displayed chan-
nel(s).
Source of internal trigger signal
is
selected by the
TRIGGER
switch.
LINE:
Trigger signal obtained
from
a sam-
ple of the
line
voltage applied
to
this
instrument.
CH
1
COUPLING
SLOPE
LEVEL
HF
STAB
(A
Trigger-
ing
only)
EXT:
Trigger signal obtained
from
an
ex-
ternal signal applied
to
the
EXT
TRIG
INPUT
connector.
EXT
-:-
10:
Attenuates external trigger sig-
nal
approximate·ly
10
times.
Light
indicates that the internal trigger sig-
nal
is
obtained only
from
the signal con-
nected
to
the Channel 1
INPUT
connector
(see
TRIGGER
switch).
Determines method of coupling trigger
signal to trigger circuit.
AC:
Rejects
DC
and attenuates signals be-
low
about 30 hertz. Accepts signals
between about 30 hertz and
50
mega-
hertz.
LF
REJ:
Rejects
DC
and attenuates signals
below about 30 kilohertz. Accepts sig-
nals between about 30 kilohertz and
50
megahertz.
HF
REJ:
Accepts signals between about 30
hertz and
50
kilohertz; rejects
DC
and
attenuates signals outside the above
range.
DC:
Accepts all trigger signals
from
DC
to
50
megahertz or greater.
Selects portion of trigger signal
which
starts the sweep.
""""
+:
Sweep can be triggered
from
positive-
going portion of trigger signal.
-:
Sweep can be triggered
from
negative-
going portion of trigger signal.
Selects amplitude point on trigger signal
at
which sweep
is
triggered.
Decreases display jitter for high-frequency
signals. Has negligible effect
at
lower
sweep rates.
A and B Sweep
DELAY-TIME
MULTIPLIER
A
SWEEP
TRIG'D
UNCAL
A
ORB
A
AND
B
TIME/DIV
AND
DELAY
TIME
Provides variable sweep delay between
0.20 and 10.20 times the delay time indi-
cated by the A
TIME/DIV
switch.
Light
indicates that A sweep
is
triggered
and
will
produce a stable display
with
correct
INTENSITY
and
POSITION
control
settings.
Light
indicates that either the A or B
VARIABLE
control
is
not
in
the
CAL
posi-
tion.
A
TIME/DIV
switch (clear plastic flange)
seleds the sweep rate of the A sweep
circuit for A sweep only operation and
selects the basic delay time
(to be
multi-
plied by
DELAY-TIME
MULTIPLIER
dial
,,...
setting) for delayed sweep operation.
B
TIME/DIV
(DELAYED
SWEEP}
switch
selects sweep rate of the B sweep circuit
®
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