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Model 1821A
Section
V
Paragraphs
5-1
to
5-12
SECTION
V
PERFORMANCE
CHECK
AND
ADJUSTMENTS
5-1.
INTRODUCTION.
5-2.
This section provides
the
performance check
(Paragraph
5-5)
and
the
adjustment
procedures
(Paragraph
5-24)
for the Model
1821A. Trouble-
shooting information,
schematic diagrams, and
com-
ponent
identification
are
in
Section
VIII.
5-3.
TEST
EQUIPMENT.
5-4.
Test equipment required
for
maintaining
and
checking
the
performance
of
the
Model 1821A
is list-
ed
in
Table
5-1.
Test equipment
with similar
char-
acteristics
may
be
substituted
if
necessary.
5-5.
PERFORMANCE
CHECK.
c.
Model 1821A
Time
Base:
Sweep
Display
MAIN
SWEEP MODE
AUTO
DELAY
(DIV)
1.00
Main
VERNIER
CAL
Main
Trigger Source
EXT
Main
SLOPE
+
(positive)
Main
Trigger Coupling
AC
Main
TIME/DIV
0.
2
pSEC
Delayed
time/
DIV
OFF
Delayed
VERNIER
CAL
Delayed Trigger Source
EXT
Delayed
SLOPE
+
(positive)
Delayed Trigger Coupling
AC
5-12.
TRIGGERING.
5-6.
The performance
check
verifies
whether
or not
the
Model 1821A
is
operating within
the specifications
as stated
in
Table
1-1.
This check
may
be used
as
part
of
an
incoming
quality control
inspection,
as a
periodic operational check, or
after
repairs
and/or
adjustments have
been made.
Recently
calibrated
test
equipment should be used
when
performing
this
check.
5-7.
A
Performance Check Record
is
included
in this
manual
on
Page
5-7
and
5-8.
As
the
initial
perform-
ance check
is
accomplished,
the actual
reading should
be entered on
the
form.
The form
should then be re-
moved from
the
manual and
filed in
a safe
place so
that
readings taken
at
a later
date
can
be
compared
with the original readings.
5-8.
The performance
check
must
be
performed
in
the
sequence
given.
Do
not
attempt
to
start
the
pro-
cedure
in
mid-sequence
as
succeeding
steps
are
de-
pendent on
control settings
and
results
of
previous
steps.
5-9.
PRELIMINARY
SET-UP.
5-10.
Lock
plug-ins together
and
install
in
Model
180-series
Oscilloscope.
Apply
power and
allow a
15
minute
warm-up.
Make
certain
the
Model
180-
series Oscilloscope
is
calibrated.
Perform
Intensity
Ratio Adjustment, Figure
3-7,
before attempting
per-
formance
check.
5-11.
INITIAL
CONTROL
SETTING.
a.
Connect
Signal
Generator
output
and
RF
Volt-
meter
input
to
Channel
A
Input
and
Main
EXT
INPUT
as
shown
is
Figure
5-1.
I82IA-A-I2
Figure
5-1.
Main
Triggering Test Set-Up
b.
Adjust
Signal
Generator
for
a
50
MHz
signal
at
0. 5
V
pk-pk
(0.
35 v
rms).
c.
Adjust
Intensity
and
position controls
if
neces-
sary
to
obtain a display.
d.
Adjust
Main
TRIGGER
LEVEL
to
obtain a stable
display.
e.
Adjust
Signal
Generator
for
a 90
MHz
signal
at
1
V
pk-pk
(0.
7
V rms).
a.
Model
180-series
Oscilloscope:
MAGNIFIER
XI
Horizontal
DISPLAY
INT
b.
Vertical Plug-In
(set
controls as applicable):
Vertical Display
A
Channel
A
Polarity
-fUP
Channel
A
Vernier
CAL
Channel
A
Volts/cm
0.
Channel
A
Coupling
AC
f.
Adjust
Main
TRIGGER
LEVEL
to
obtain a stable
display.
g.
Connect
Signal
Generator
output
and
RF
Volt-
meter
input
to
Channel
A
Input,
Main
EXT
INPUT,
and Delayed
EXT
INPUT
as
shown
in
Figure
5-2.
h.
Set
Sweep
Display
to
DELAYED
and Delayed
TIME/DIV
to
0.
1
pSEC.
i.
Adjust
Signal
Generator
for a 50
MHz
signal
at
0. 5
V
pk-pk
(0.
35 v
rms).
02591-3
5-1
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