Page
86
3.
( )
Adjust
the
Y2
CAL control for a dis-
play
5
em
high.
( if Set
the
TIME/CM
switch
to
0.2
p.,s.
( ) Set
the
generator frequency to 1 MHz
and
adjust
' .
r-
its
output
to
produce
a
display
that
is four or
\J
five
em
high
.
( )
Adjust
the
Y2
H.F. COMP
trimmer
capacitor for
a
square
wave
with
a
smooth
leading
edge
as
shown
in
Pictorial 6-8 (Illustration Booklet,
Page 24).
( )
Connect
the
1 MHz
square
wave
signal to
the
Y1
INPUT connector.
( ) Set
the
Y1
VOL
TS/CM
switch
to 0.1 (be
sure
the
VARIABLE control is fully clockwise),
the
Y1-
Y2-CHOP-ALT
switch
to Y1,
and
the
Y1-Y2-
EXT-LINE
switch
to
Y1.
Adjust
the
square
wave
generator
until
the
display
is 4 or 5
em
high
.
( )
Adjust
the
Y1
H.F. COMP
trimmer
capacitor
for
a
square
wave
with
a
smooth
leading
edge
as
shown
in
Pictorial 6-7.
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
Y1
INPUT connector,
set
the
TIME/CM
switch
to
2 ms,
set
the
VOLTS/CM
switch
to
0.2,
and
adjust
the
Y1
CAL control for a
display
that
is 4.5
em
high.
The
Y1
VARIABLE control
must
be
set
fully clockwise.
1.
Set
the
Y1
VOLTS/CM
switch
to
.02.
2.
3.
4.
Set
the
generator
output
to 0.1 V.
Set
the
TIME/CM
switch
to
200
p.,s.
Adjust
the
Y1
CAL control for a
display
5
em
high.
HORIZONTAL AMPLIFIER ADJUSTMENTS
( )
Set
the
Y1
AC-GND-DC
switch
to
GND.
Refer
to
Pictorial 6-4 for
the
following steps.
( )
Adjust
the
SWEEP LENGTH control for a trace
that
is 10
em
long (just fills
the
screen).
( ) Set
the
Y1
AC-GND-DC
switch
to
AC.
Set
the
generator frequency
to
5 kHz.
Adjust
the
horizontal
circuit
board
CAL control
and
the
HORIZ POS control so
there
are
ten
complete
waveforms
in
10
em
as
shown
in
Pic-
torial 6-9 (Illustration Booklet, Page 24).
NOTE:
If
a calibrated signal source is
not
available,
use
the
1 V (P-P) 60 Hz output. Set
the
TIME/CM
switch
to 2 mS
and
adjust
the
HORIZ CAL control for
a waveform
that
is 8.6
em
long.
The
1 V (P-P) 60 Hz
output
can
be
used
for
the
remaining
Horizontal
Amplifier
Adjustments.
Set
the
Y1
AC-GND-DC
switch
to
GND.
Readjust
the
SWEEP LENGTH control for a
trace
that
is 10
em
long (just fills
the
screen).
( ) Move
the
trace
one
division
to
the
left
with
the
HORIZ POS control
and
again
adjust
the
SWEEP LENGTH control
until
the
trace
again
fills
the
screen.
The
trace is
now
11
em
long.
( ) Set
the
generator frequency
to
produce
a
sine
wave
approximately
500 Hz.
Set
the
Y1
AC-GND-DC
switch
to
AC.
Set
the
TIME/CM
switch
to 2
ms
.
{
Adjust
the
Y1
POS control
to
center
the
trace
vertically
on
the
screen.
( )
Adjust
the
HORIZ POS control so
the
left
end
of
the
trace is
on
the
screen.
( )
Adjust
the
TRIG LEVEL control so
the
trace
starts
on
the
zero base
line
(center of
the
graticule).
Then
move
the
+/-
switch
to
the
"-"
position.
Adjust
the
TRIG BAL control so
the
trace starts
on
the
zero
base
line. Move
the
+I-
switch
back
and
forth to make
this
final
adjustment.
( ) Move
the
TRIGGER COUPLING
switch
to
DC.
If
the
trace starting
point
moves,
adjust
the
Y1
TRIG ZERO control (on
the
vertical board)
until
there
is
no
movement
when
you
switch
the
coupling
switch
back
and
forth
between
the
AC
and
DC
positions. Use
the
TRIG
LEVEL
control
to keep
the
trace starting
on
the
zero base line.
( ) Move
the
signal cable from
the
Y1
INPUT to
the
Y2
INPUT. Change
theY-
Y2-CHOP-ALT
switch
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