Time-Base
Generator
ASTIGMATISM
Control
used
in
conjunction
with
the
FOCUS
control
to
adjust
the
beam
for
maximum
sharpness
of
the
trace.
SCALE
ILLUM.
Control
to
vary
the
brightness
of
the
graticule
illumination.
VERTICAL
POSITIONING
Control
to position
the
trace
vertically.
HORIZONTAL
POSITIONING
Control
to position
the trace
horizontally.
TRIGGER
SELECTOR
(red
knob)
Four-position switch
to
select
four
kinds
of
triggering:
H
F
SYNC,
AUTO, AC
and
DC.
TRIGGER
SELECTOR
(black
knob)
Six-position switch
to
select
the
source
and
polarity
of
the
triggering
signal.
TRIGGER
INPUT
Coax
connector to triggering circuits.
STABILITY
Control
to
adjust
time-base
circuits
for
triggered
or
recurrent
operation.
This
control
has
a
PRESET
position
suitable
for
most
triggering
applications
(S/N
1001
-up).
This
control
also
functions
as
an
attenuator
for
external
signals
connected
to
the
EXT.
HORIZ.
INPUT binding
post.
TRIGGERING
LEVEL
Control
to
select
the
point
on
the
triggering
waveform
where
the
time
base
begins.
HORIZ.
DISPLAY
Three-position
switch
to
increase
the
sweep
rate
five
times
in
the
MAG.
position
and
to
connect
the
horizontal
amplifier
to the
EXT.
HORIZ.
INPUT
binding
post
in
the
EXT.
position.
When
this control
is
in the MAG.
position,
the
MAG.
light
indicates
that
the
sweep
rate
has
been
increased
five
times.
EXT.
HORIZ.
INPUT
Binding
post
to
apply
an
external
signal
to
the
horizontal
amplifier.
T1ME/CM
Twenty-two-position
switch
to
select
calibrated
sweep rates
from
2
sec/cm
to
.2
gsec/cm.
VARIABLE
(red
knob)
Continuously
variable
control
to
vary
the
sweep
rate
between
ranges
and
to 5
sec/cm.
When
this control
is
away
from
the
clockwise
stop
the
UNCALIBRATED
light
indicates
that the
time base is
not
calibrated.
Vertical
Amplifier
INPUT
1
INPUT
2
Separate
signal
inputs
to
the
vertical
amplifier
by
way of
the
INPUT
SELECTOR switch.
INPUT
SELECTOR
Four-position
switch to select
either input
connector
and
insert
or
remove
a
de
blocking
capacitor
from
the
input
circuits.
DC
BAL.
Screwdriver
control
to
balance
the
amplifier
circuits
so
that there
is
no
shift
in
the
trace position
as the
VARIABLE
control is
rotated.
2-4
Operating
Instructions
-
Type
515/515A
AA
