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Model 1821A
b.
Set
Time Mark
Generator and
delayed
TIME/
DIV
according
to
Table
5-3.
Adjust
Delayed
TRIGGER
LEVEL
for display.
c.
Adjust Horizontal
POSITION
to
align
first
marker
with
left
edge
of
graticule.
d.
The
11th
or 21st
marker
(according
to
Table
5-3)
is
within 0.3 div
of
right
edge
of
graticule.
Table
5-3.
Delayed Sweep Performance
Time Mark
Generator
Delayed
TIME
7
DIV
Setting
Time Mark
to
Check
0.
1
psec
0.
1
pSEC
11
1
psec
1
pSEC
11
10
psec
10
pSEC
11
0.
1
msec
0.
1
MSEC
11
1
msec
IMSEC
11
1
msec
2
MSEC
21
50
msec
50
MSEC
11
5-18.
DELAYED
SWEEP
VERNIER.
a.
Set
Delayed
TIME/DIV
to
50
MSEC
and
rotate
Delayed
VERNIER
fully
ccw.
b.
Set
Time Mark
Generator
for
0. 5
sec
markers.
c.
Any
two
markers
are displayed
in
less
than
4
cm.
5-19.
DELAY
TIME
ACCURACY.
a.
Set:
Sweep
Display
MAIN
Main
TIME/DIV
1
MSEC
Delayed
TIME/DIV
10
pSEC
Delayed Trigger Source
AUTO
Delayed
VERNIER
CAL
b.
Set
Time Mark
Generator
for
1
msec
markers.
c.
Adjust
Main
TRIGGER
LEVEL
for
display.
d.
Adjust
DELAY
(DIV)
to
intensify
2nd
marker.
e.
Position
Sweep
Display
to
DELAYED.
f.
Adjust
DELAY
(DIV)
to
set visible
marker
1
div
from
start
of
display.
Note
DELAY
(DIV) settings.
g.
Set
Sweep
Display
to
MAIN and
adjust
DE-
LAY
(DIV)
to
intensify 10th
marker.
h.
Set
Sweep
Display
to
DELAYED.
i.
Adjust
DELAY
(DIV)
to
set visible
marker
1
div
from
start
of
display.
Note
DELAY
(DIV)
setting.
j.
Difference
between
DELAY
(DIV)
settings
in
steps d
and
f
is
8.
00
i
0.
08.
5-20.
DELAY
TIME
LINEARITY.
a.
Rotate
DELAY
(DFV)
cw fromO.
00 and
adjust
to
set
first
visible
marker
1
div
from
start
of
display.
Note
DELAY
(DIV)
setting.
b.
Adjust
DELAY
(DIV)
to
set
5th visible
marker
1
div
from
start
of
display.
Note
DELAY
(DIV)
setting.
c.
Adjust
DELAY
(DIV)
to
set 9th visible
marker
1
div
from
start
of
sweep.
Note
DELAY
(DIV)
setting.
d.
Subtract
the setting
in
step a
from
the setting
in
step
c
-
Divide
the
difference
by
2
-
Add
this
Section
V
Paragraphs
5-18
to
5-29
result
to
the setting
in
step a
-
Subtract
from
this
sum
the setting
of
step
b
-
Divide
this
result
by
2.
e.
Answer
is
0
i
0.02.
A
=
step a
C
-
A
B
=
step b
A
+
-
B
C
=
step
c
2
=
0
±
.
02
2
5-21.
JITTER.
a.
Set
Delayed
TIME/DIV
to
lu.SEC.
b.
Adjust
DELAY
(DIV)
to
view
the 9th visible
mark-
er.
c.
Observe
that
horizontal
jitter
is
less than
0. 5
div.
5-22.
DELAYED TRIGGER OUTPUT.
a.
Connect
DEL'D TRIGGER
OUTPUT
through
a
10:1
Divider
Probe
to
the
monitor
Oscilloscope.
b.
Observe
a positive
pulse greater than
1
volt
in
amplitude and
with a rise
time
of
less
than
50 nsec.
5-23.
MIXED SWEEP.
a.
Set:
Sweep
Display
MIXED
Main
TIME/DIV
1
MSEC
Delayed
TIME/DIV
5.
00
b.
Observe
that first
part
of
display
is
brighter
than
last
part.
c.
Disconnect
Time Mark
Generator.
5-24.
SINGLE SWEEP.
a.
Set:
Sweep
Display
MAIN
SWEEP MODE
SINGLE
Main
TIME/DIV
0.1
SEC
Delayed
TIME/DIV
OFF
b.
Depress
RESET.
RESET
lamp
lights.
c.
Rotate
Main
TRIGGER
LEVEL
fully
cwand
then
fully
ccw.
d.
Beam
should
sweep
only
once.
RESET
lamp
extinguishes
at
end
of
sweep.
5-25.
ADJUSTMENTS.
5-26.
Procedures
for
making
adjustment
in
the
Model 1821A
are given
in
Paragraphs
5-27 through
5-36.
Required
test
equipment
is
listed
in
Table
5-1.
Test equipment
with similar characteristics
may
be
substituted
if
necessary.
Figure
8-2
shows
the loca-
tion
of
adjustments
in
the
Model
1821A.
5-27.
PRELIMINARY.
5-28.
Lock
plug-ins together
and
install
in
Model
180-series Oscilloscope.
Apply
power
and
allow
a
fifteen
minute
warm-up.
Set front
panel adjustment,
INTENS
RATIO,
to
midrange
before attempting ad-
justment procedure.
5-29.
INITIAL
CONTROL
SETTINGS.
a.
Model
180-series Oscilloscope:
MAGNIFIER
XI
Horizontal
DISPLAY
INT
02591-3
5-3
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