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Section
V
Paragraphs
5-30
to
5-35
Model 1821A
b.
Vertical Plug-In
(set
controls as
applicable).
Vertical
DISPLAY
A
Channel
A
Polarity
+UP
Channel
A
Vernier
CAL
Channel
A
Volts/div
.05
Channel
A
Coupling
AC
c.
Model 1821A
Time
Base:
Sweep
Display
MAIN
SWEEP MODE
SINGLE
DELAY
(DIV)
1.00
Main
VERNIER
CAL
Main
Trigger Source
EXT
Main
SLOPE
+ (positive)
Main
Trigger Coupling
AC
Main
TIME/dIV
1
MSEC
Delayed
TIME/DIV
OFF
Delayed
VERNIER
CAL
Delayed Trigger Source
EXT
Delayed
SLOPE
+ (positive)
Delayed Trigger Coupling
AC
5-30.
OUTPUT
LEVEL.
a.
Monitor
TP204
(see
Figure
8-2) with
DC
Volt-
meter.
b.
Adjust
R238
for 0
vdc
±
15
mv.
c.
Set
Delayed
TIME/DIV
to
0.
1
MSEC.
d.
Monitor
TP404
(see
Figure
8-2)with a
DC
Volt-
meter.
e.
Adjust
R422
for 0
vdc
±
15
mv.
5-31.
TRIGGER SYMMETRY.
a.
Rotate
Delayed
TIME/bIV
to
O
F F
and
set
SWEEP MODE
to
AUTO.
b.
Connect
a
1
kHz
200
mv
pk-pk
signal
from
Oscillator output
to
Channel
A
Input,
Main
EXT
IN-
PUT, and Delayed
EXT
INPUT.
c.
Center
Main
TRIGGER
LEVEL
control
exactly.
d.
Adjust
R127
to
obtain a stable
display.
e.
Set
Sweep
Display
to
DELAYED
and Delayed
TIME/DIVto
0.
5
MSEC.
f.
Center Delayed
TRIGGER
LEVEL
control
exa:ctly.
g.
Adjust
R318
to
obtain a display.
5-32.
MAIN SWEEP
LENGTH.
a.
Set:
Sweep
Display
MAIN
Delayed
TIME/DIV
OFF
Channel
A
Volts/
div
0.5
b.
Adjust
Oscillator output for a 100
kHz
3v pk-pk
signal.
c.
Set
Main
TRIGGER
LEVEL
for
shortest hori-
zontal display.
d.
Adjust
R251
for a
horizontal display
of
10
div.
e.
Adjust Horizontal
POSITION
to
place
right side
of
display
on
ninth
graticule
line.
Readjust
R251
to
increase
display length
0.
4
div
(this
gives a
total
dis-
play length
of 10.
4
div).
5-33.
DELAYED SWEEP LENGTH.
a.
Set
Sweep
Display
to
DELAYED
and Delayed
TIME/DIV
to
0. 5
MSEC.
b.
Set
Delayed
TRIGGER
LEVEL
for the shortest
horizontal
display.
c.
Adjust
R435
for a 10
cm
horizontal
display.
d.
Adjust Horizontal
POSITION
to
place
right side
of
display
on
eighth graticule
line.
Readjust
R435
to
increase
display length
1.
5
div
(this
gives a
total
dis-
play length
of
11.5
div
)
e.
Disconnect
Oscillator.
5-34.
MAIN SWEEP
TIME.
a.
Set:
Sweep
Display
MAIN
Delayed
TIME/DIV
OFF
SWEEP MODE
NORM
Main
Trigger Source
INT
b.
Connect
Time Mark
Generator
to
Channel
A
In-
put.
c.
Set
Time Mark
Generator and
Main
TIME/DIV
switch as indicated
in
Table
5-4.
Adjust
Main TRIG-
GER LEVEL
for display.
d.
Adjust Horizontal
POSITION
to
align
1st
marker
with
left
edge
of
graticule.
e.
Perform
adjustment
specified
in
Table 5-4
to
align 11th
marker
with
right
edge
of
graticule.
Table
5-4.
Main Sweep
Time
Time Mark
Generator
Main
TIME/DIV
Setting
Time Mark
to
Adjust
Adjust
0.
1
psec
0.
1
pSEC
11
C510
1
psec
1
pSEC
11
C508
5
psec
5
pSEC
11
C506
50
psec
50
pSEC
11
R516
500
psec
0. 5
MSEC
11
R515
5
msec
5
MSEC
11
R514
50
msec
50
MSEC
11
R513
5-35.
DELAYED SWEEP
TIME.
a.
Set:
Sweep
Display
DELAYED
Main
TIME/DIV
0. 2
pSEC
Delayed Trigger Source
INT
b.
Set
Time Mark
Generator and
Main
TIME/CM
as indicated
in
Table
5-5.
Adjust
Delayed
TRIGGER
LEVEL
for display.
c.
Adjust Horizontal
POSITION
to
align
1st
marker
with
left
edge
of
graticule.
d.
Perform
adjustment
specified
in
Table
5-5
to
align 11th
marker
with
right
edge
of
graticule.
Table
5-5.
Delayed Sweep
Time
Time Mark
Generator
Delayed
TIME/DIV
Setting
Time Mark
to
Adjust
Adjust
0.
1
p
sec
0.1
pSEC
11
C532
1
psec
1
pSEC
11
C530
5
psec
5
pSEC
11
C528
50
psec
50
pSEC
11
R539
500
p
sec
0.5
MSEC
11
R538
5
msec
5
MSEC
11
R537
5-4
02591-3
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