=
NOTE: Because of
the
normal
aging of
your
Oscillo-
scope,
you
may
have
to
repeat
the
previous
adjust-
ment
periodically.
(
'")
Place
the
front
panel
Y1-Y2-CHOP-ALT
switch
in
the
Y1
position.
( <"(' Set
the
voltmeter
to
measure
5 volts
DC.
( ) Measure
the
voltages at TP8
and
TP9.
Adjust
the
front
panel
Y1
POS
control
until
both
read
-
ings
are
the
same.
Then
adjust
the
Y1
BIAS
ADJ
control
until
the
reading
is
the
same
as
the
one
you
recorded
earlier
in
the
Manual
(4.8
to
5.2
volts).
Page 85
(---)
Measure
the
voltage
at
TP10
and
adjust
the
Y1
TRIG ZERO control for zero volts.
(t'
--r Place
the
front
panel
Y1-Y2-CHOP-ALT
switch
in
the
Y2
position.
L.}--
Measure
the
voltages
at
TP11
and
TP12.
Adjust
the
front
panel
Y2
POS control
until
both
read-
ings are
the
same.
Then
adjust
the
Y2
BIAS
ADJ
control
until
the
reading
is
the
same as
the
one
you
recorded
earlier
(4
.8 to 5.2 volts).
Measure
the
voltage
at
TP13
and
adjust
the
Y2
TRIG ZERO control for zero volts.
AC CALIBRATION
Set
the
front
panel
controls as follows:
(
I(
Both VOLTS/CM: 0.05
(/ Both VARIABLE:
Full
clockwise.
( { Y1-Y2-CHOP-ALT:
Y1
( Y1-Y2-EXT-LINE:
Y1
( TIME/CM: 200 p,s
(
~
Use
the
Y1
pas
and
HORIZ POS
controls
and
center
the
trace
on
the
screen.
(
~
Place
the
Y1
AC-GND-DC
switch
in
the
AC posi-
tion
.
( t) Refer
to
Pictorial 5-6 (Illustration Booklet, Page
24)
and
connect
a
1kHz
square
wave
signal
to
the
Y1
INPUT connector.
Adjust
the
generator
output
to
produce
a
display
that
is 4 or 5
em
high.
Adjust
the
TRIG LEVEL as
required
.
VERTICAL CALIBRATION AND
ATTENUATOR COMPENSATION
Refer
to
Pictorial 5-5 (Illustration Booklet, Page 24) for
the following steps.
NOTE:
In
the
following
steps
,
use
the
channel
Y1
switches
and
trimmer
capacitors.
1. ( )
Set
the
VOLTS/CM
switch
to
the
0.1 posi-
tion. Use a
nonmetallic
screwdriver
to ad-
just
the
x 100
trimmer
capacitor for a
proper
display
like
the
one
labeled
RIGHT
in
Pictorial 6-7.
If
it will
not
adjust,
then
adjust
the
X10
trimmer
capacitor.
2. ( ) Set
the
VOLTS/CM
switch
to
the
1 position,
readjust
the
generator
output
as necessary,
and
adjust
the
x 1000
trimmer
capacitor for
a
proper
display.
If
it
will
not
adjust
,
then
adjust
the
x 100
trimmer
capacitor.
3. ( ) Set
the
VOLTS/CM
switch
to
the
10 posi-
tion,
readjust
the
generator
output
as
necessary,
and
adjust
the
X10
trimmer
capacitor for a
proper
display.
4. ( ) Repeat
the
above
three
steps
until
the
com-
pensation
is correct.
( ) Set
the
Y1-Y2-CHOP-ALT
switch
to Y2,
the
Y2
AC-GND-DC
switch
to AC,
the
Y1-Y2-EXT-
LINE
switch
to Y2,
connect
the
square
wave
signal to
the
Y2
INPUT
connector
,
and
repeat
·
the
previous
four steps for
channel
Y2.
NOTE:
If
you
do
not
have
a calibrated voltage source,
disregard
the
next
three
steps
and
use
the
1 V (P-P) 60
Hz signal
that
is available
at
the
front panel. Connect
the
signal to
the
Y2
INPUT connector, set
the
TIME/C
switch
to 2 mS, set
the
VOLTS/CM
switch
to 0.2,
and
adjust
the
Y2
CAL control for a
display
that
is 4.5 em
high.
The
Y2
VARIABLE control
must
be
set fully
clockwise.
1. ( )
Set
the
generator
output
to
.1
V.
2. ( ) Set
the
Y2
VOLTS/CM
switch
to .02.
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