c.
Turn
the
HORIZ.
DISPLAY
switch
to
MAG.
and
position
the
spot
behind
the
center graticule
line
with
the
HORI
ZONTAL
POSITIONING
control.
d.
Turn
the
HORIZ.
DISPLAY
switch to
NORM,
and
adjust the
Mag.
Regis, con
trol
so
that
the
spot
is
again
centered.
5.
10-Microsec/cm
Adjustment
A
trimmer,
C160E,
across
the
timing
capacitor,
adjusts
the
rate
of
the sweep in
the
10-, 20-,
and
50-gSEC/CM
positions
of
the
TIME/CM
switch.
a.
Set
the
TIME/CM
controls
to
10
pS
EC/CM,
CALIBRATED.
b.
Display 10-microsecond
markers.
c.
Adjust
C160E,
the
top trimmer
on
the
TIME/CM
switch,
so
the
markers
corres
pond with
the
graticule.
6. 1-Microsec/cm
Adjustment
Capacitor
C160C
adjusts
the
rate
of
the
1-,
2-
and
5-microsecond/cm
sweeps.
a.
Set
the
TIME/CM
controls
to
5
gSEC/
CM, CALIBRATED.
b.
Display
1
-microsecond
markers.
c. Turn
the
HORIZ.
DISPLAY
switch
to
MAG.
d.
Position
the
trace
to
the
left
so
the
end
of
the
trace is
visible
and
adjust
C160C,
located
on
the
TIME/CM
switch, so
the
markers
correspond
with
the
graticule.
7. 1-Microsec/cm
Linearity Adjustment
Capacitor
C210
affects
the
rate
of
the start
of
the
trace
in
the
high-speed
ranges.
a.
With
the
controls
unchanged
from
step
6,
position
the
trace
to
the
right so
the
start
of
the
trace
is
visible.
b.
Adjust
C210, located
just to
the
rear of
the
top
row
of controls,
so
the
markers
correspond
with
the
graticule.
c.
Recheck
step 6-d.
8. 2-Microsec/cm Linearity Adjustment
Capacitor
C224
compensates
the
divider
in
the feedback network
and
affects
the
start
of
the trace in
the
NORM,
position
of
the
HORIZ.
DISPLAY switch.
a.
Set
the
TIME/CM
controls
to
2
pSEC/
CM,
CALIBRATED.
b.
Set
the
HORIZ.
DISPLAY
switch
to
NORM.
c.
Display
1-microsecond
markers.
d.
Adjust C224
so the
sweep
rate
over
the
first
two
centimeters
is
the
same
as
for
the
remainder
of the
trace.
C224
is
located
on
the
HORIZ.
DISPLAY
switch
just above
the power transformer.
9. ,5-Microsec/:m Adjustment
Trimmer
C160A
serves
as
the
timing
capac
itor
in
the
.2-
and
,5-microsec/cm
ranges.
a.
Set
the
TIME/CM
controls to
.5
pSEC/CM,
CALIBRATED.
b.
Display 1-microsecond
markers.
c.
Adjust
C160A,
located near
the
bottom
of
the
TIME/CM
switch,
so
that
a
marker
corresponds
with
every
second graticule
line.
10. .2-Microsec/cm Linearity
Adjustment
Capacitor
C260
provides
high-frequency
com
pensation
to
obtain
a
linear
sweep
at
this
rate.
a.
Set
the
TIME/CM
controls
to
.2
pSEC/
CM,
CALIBRATED.
b.
Display
a
10-mc
sine
wave.
c.
Adjust
C260, located
on
the
plastic
plate
over
the
neck
of
the
crt,
for
two
cycles
for
each
cm.
This
adjustment
has
the
greatest
effect
over
the
first
five
centi
meters.
11. . 04-Microsec/cm
Adjustment
Capacitor
C272,
located behind
the
plastic
plate
over
the
neck
of the
crt,
adjusts
the
maximum
sweep
speed
of
the oscilloscope.
5-6
Recalibration
Procedure
-
Type
515/515A
AA