Operating instructions

BEFORE YOU BEGIN,
see
CONTROL SETTINGS
Set
the 7887 controls
as follows :
Equipment Required : (Refer
to Table 5-1, Test Equipment
.)
1 . Oscilloscope
mainframe .
2 . Amplifier
plug-in units .
3 . Low-frequency
sine-wave generator .
4 . Medium-frequency
signal generator .
5 . High-frequency signal
generator .
6 . Plug-in
extender .
TRIGGERING
MODE
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . P-P
AUTO
COUPLING . . . . . . . . . . . . . . .
. .
.
. . . . . . . . . . . . .
AC
SOURCE .
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .
.INT
SWEEP
POSITION
. . . . . . . . . .
. . . . .
. . . . . . . . . . .
Midrange
TIME/DIV
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . .
20 Ns
VARIABLE . . . . . . . .
. . . . . . . . . . . . . . IN (calibrated)
MAG .
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
. . X1
HOLD OFF
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . MIN
Al . ADJUST'
DC BALANCE
AND SLOPE
BALANCE
(R85, 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
approximately
0 (midrange)
and TRIGGERING
SLOPE
to (+) .
J
Performance Requirement check ;
see introductory
information .
Performance
Check and
Adjustment--7B87
7 . 50-ohm cables (2) .
8 . BNC T
connector .
9 . 2X attenuator .
10 . 10X attenuator .
in the Diagrams
section .
e . Check for a stable
display with TRIG'D light
on .
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 be
met, repeat step Al
.
V
A2 . CHECK
TRIGGERING MODES
a . Set the
low-frequency sine--wave
generator and
the
amplifier unit
deflection factor for
approximately
a 2-
division
display .
V b . CHECK---For a
stable display at all
LEVEL control
settings (P-P AUTO
MODE) .
c .
Set the TRIGGERING
MODE to AUTO
.
5-5