Operating instructions
Performance
Check
and
Adjustment-71380
BEFORE
YOU
BEGIN,
see
Control
Settings
Set the 71380
controls
as
follows
:
5-
4
TRIGGERING
A7
.
ADJUSTDC
BALANCE
AND
SLOPE
BALANCE
(1385,
R80)
a
.
Connect
the
low-frequency
sine-wave
generator
to
the
amplifier
unit
input
with
a
50-ohm
cable
.
b
.
Set the
oscilloscope
mainframe
intensity
and
focus
controls for
the
desired display
.
c
.
Set the
low-frequency
sine-wave generator
and the
amplifier
unit
deflection
factor
for
a
0
.3-division
display
at
50
kilohertz
.
Center
the display
vertically
.
d
.
Set the
TRIGGERING
LEVEL
control
to approxi-
mately
0
(midrange)
and
TRIGGERING
SLOPE
to
(+)
.
e
.
Check
for
a
stable
display
with
TRIG'D
light
on
.
Performance
Requirement
check
;
see
introductory
information
.
A
.
TRIGGERING
SYSTEM
Equipment
Required
1
.
Oscilloscope
mainframe
.
2
.
Amplifier
plug-in
unit
.
3
.
Low-frequency
sine-wave generator
.
4
.
High-frequency
signal
generator
.
5
.
Plug-in
extender
.
6
.
50-ohm
cables
(2)
.
7
.
BNC
T
connector
.
TEST
POINT
AND
ADJUSTMENT
LOCATIONS
in
the
Diagrams
section
.
f
.
ADJUST-1385
(DC
Balance) for
a
stable
crt
display
.
g
.
Set the
SLOPE
switch
to
(-)
and
check
for
a
stable
display
.
h
.
ADJUST-1380
(Slope
Balance)
for
a
stable
display
.
i .
Check
for
a
stable
display
when
the
SLOPE
switch
is
set
to
(+)
and
(-)
.
j
.
INTERACTION-Repeat
the
adjustment
of
R85
(DC
Balance)
and
R80
(Slope
Balance)
until
a
stable
display
is
obtained
while
changing
TRIGGERING
SLOPE
.
NOTE
If
any
of
the
CHECK
parts
in
the
following
steps
cannot
bemet,
repeat
step (A)
1
.
-\/
A2
.
CHECK
TRIGGERING
MODES
a
.
Remove
the
71380
and
plug-in
extender
;
then
install
the 71380
directly into
the B horizontal
compartment
.
b
.
Set the
low-frequency
sine-wave generator
and
the
amplifier
unit
deflection
factor
for
approximately
a 2-
division
display
.
.\/
c
.
CHECK-For
a
stable
display
at
all
LEVEL
control
settings (P-P
AUTO
MODE)
.
MODE
P-P
AUTO
COUPLING
AC
SOURCE
INT
SWEEP
POSITION
Midrange
TIME/DIV
20
Ms
VARIABLE
IN
(calibrated)
MAG
X
1
HOLD
OFF
MIN