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Section
V
Paragraphs
5-13
to
5-17
j.
Adjust
Delayed
TRIGGER
LEVEL
to
obtain a
stable display.
k.
Adjust
Signal
Generator
for a
90
MHz
signal
at
1
V
pk-pk
(0.
7
V rms).
m.
Adjust
Delayed
TRIGGER
LEVEL
to
obtain
a
stable display.
n.
Disconnect
Signal
Generator.
Figure
5-2.
Delayed
Triggering Test Set-Up
5-13.
TRIGGER POINT
AND
SLOPE.
a.
Set:
MAGNIFIER
XI
Sweep
Display
MAIN
Main
TIME/diV
5
MSEC
Delayed
TIME/DIV
OFF
Channel
A
Volts/div
1
b.
Connect
a 40 Hz,
5
volt
pk-pk
ac signal
from
Oscillator output
to
Channel
A
Input,
Main
EXT
IN-
PUT, and Delayed
EXT
INPUT.
c.
Adjust
Main
TRIGGER LEVEL.
Note
that
dis-
play
is
stable as trigger point
moves
smoothly
along
positive slope
of
waveform.
d.
Set
Main
SLOPE
to
-
(negative).
e.
Adjust
Main
TRIGGER LEVEL.
Note
that dis-
play
is
stable as trigger point
moves
smoothly
along
negative slope
of
waveform.
f.
Set
Sweep
Display switch
to
DELAYED
and
De-
layed
TIME
/DIV
switch
to
2
MSEC.
g.
Adjust
Delayed
TRIGGER LEVEL.
Note
that
display
is
stable as trigger point
moves
smoothly
along positive slope
of
waveform.
h.
Set
Delayed
SLOPE
to
-
(negative).
i.
Adjust
Delayed
TRIGGER LEVEL.
Note
that
display
is
stable as trigger point
moves
smoothly
along negative slope
of
waveform.
j.
Disconnect
Oscillator.
Note
The
results
of
checks
made
in
Paragraphs
5-14 through 5-19 are
determined
by
the
calibration
of
both the
Model 1821A and
the
Model
180-series Oscilloscope.
Model 1821A
5-14.
MAIN SWEEP
TIME.
a.
Connect
Time Mark
Generator
output
to
Channel
A
Input.
b. Set:
Sweep
Display
MAIN
Delayed
TIME/DIV
OFF
SWEEP MODE
NORM
Main
Trigger Source
INT
Main
SLOPE
+ (positive)
Channel
A
Volts/div
0.
5
c.
Set
Time Mark
Generator and
Main
TIME/CM
switch according
to
Table
5-2
.
Adjust
Main
TRIGGER
LEVEL
for
display.
d.
Adjust Horizontal
POSITION
to
align
first
mark-
er with
left
edge
of
graticule.
e.
The
11th or
21st
marker
(according
to
Table
5-2),
is
within
0.
3
div
of
right
edge
of
graticule.
Table
5-2.
Main Sweep Performance
Time Mark
Generator
Main
TIME/
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
10
msec
lOMSEC
11
10
msec
20
MSEC
21
1
sec
1
SEC
11
5-15.
MAIN SWEEP
VERNIER.
a.
Set
Time Mark
Generator
for
0. 5
sec
markers.
b.
Set
Main
TIME/DIV
to
50MSEC
and
rotate
Main
VERNIER
fully
ccw.
c.
Any
two
markers
are displayed
in
less than
4 div.
5-16.
MAGNIFIED
SWEEP.
a.
Set:
Horizontal
MAGNIFIER
X5
Main
TIME/DIV
0.
1
pSEC
Main
VERNIER
CAL
b.
Set
Time Mark
Generator
to
20 nsec.
Adjust
Main
TRIGGER
LEVEL
if
necessary
for
display.
c.
Adjust Horizontal
Position
to
align
peak
of
first
cycle with
left
edge
of
graticule.
d.
Peak
of
11th
cycle
is
within
0.
5
mm
of
right
edge
of
graticule.
e.
Set
Horizontal
MAGNIFIER
to
XIO
and
Time
Mark
Generator
to
10 nsec.
f.
Adjust Horizontal
Position
to
align
peak
of
first
cycle with
left
edge
of
graticule.
g.
Peak
of
11th cycle
is
within
0. 5
div
of
right
edge
of
graticule.
5-17.
DELAYED
SWEEP
TIME.
a.
Set:
Main
VERNIER
CAL
Main
TIME
/DIV
0.2
pSEC
Sweep
Display
DELAYED
Delayed Trigger Source
INT
Delayed
Slope
+
(positive)
5-2
02591-3
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