m.
Position
the bottom of the display to the bottom
hori-
zontal
line.
n.
CHECK-Compression or expansion 0.15 division or
less
(see
Fig.
5-15).
o.
Disconnect all test equipment.
20.
Check Trace Shift Due
to
Input Gate Current
a. Change the following control settings:
VOLTS/DIV
(CH
l and
2)
5mV
VARIABLE
(CH
l and
2)
CAL
Input Coupling
(CH
l and
2)
GND
LEVEL
Clockwise
b.
Position the trace
to
the center horizontal
line
with
the Channel 2
POSITION
control.
c.
CHECK-Set the Channel 2 Input Coupling
switch
to
DC.
Trace shift should be negligible.
d.
Set the
MODE
switch to
CH
1.
e.
Position
the trace
to
the center horizontal
line
with
the Channel l
POSITION
control.
f.
CHECK-Set the Channel l
Input
Coupling switch to
DC.
Trace shift should be negligible.
21
. Check Alternate Operation
a. Set the
MODE
switch
to
ALT.
b.
Position
the traces about two divisions apart.
c.
Turn
the A
TIME/DIV
switch
throughout
its
range.
d.
CHECK-Trace alternation between Channel l and 2
at
all sweep rates.
At
faster sweep rates, alternation
is
not
apparent; instead display appears as two traces
on
the
screen.
22.
Check/ Adiust Channel 1 and 2
Volts/
Division Switch
Series
Compensation
a. Change the following control settings:
VOLTS/DIV
(CH
l and
2)
Input Coupling
(CH
l and
2)
MODE
A and B
TIME/DIV
20mV
DC
CH
1
.2
ms
0
b.
Connect the square-wave generator
(Type
l
06)
high-
amplitude output connector to the Channel l
INPUT
con-
"""
nector through the five-nanosecond
GR
cable, 5 X
GR
attenu-
ator and
50-ohm
in-line
termination
in
given order.
©
Performance Check/Calibration-Type
453/R453
c.
Set the square-wave generator for four divisions of one-
kilohertz signal.
d. Set the A
LEVEL
control for a stable display.
e. CHECK-CRT display
at
each
CH
1
VOLTS/DIV
switch
setting listed
in
Table
5-2
for optimum square corner
(see
Fig.
5-16A,
B,
and
C).
f.
ADJUST-CH l
VOLTS/DIV
switch
series compensation
as given
in
Table
5-2
for optimum square corner
on
the dis-
play. Readjust the generator output
with
each setting of the
CH
l
VOLTS/DIV
switch (remove 5 X attenuator as required)
to provide four divisions of deflection.
Fig.
5-l
6D
shows the
location
of
the variable capacitors.
g. Disconnect the signal
from
the Channel 1
INPUT
con-
nector and reconnect
it
to the Channel 2
INPUT
connector
through the five-nanosecond
GR
cable, 5 X
GR
attenuator
and
50-ohm
in-line termination.
h.
Set the
MODE
switch to
CH
2.
i.
CHECK-CRT display
at
each
CH
2
VOL
TS/DIV
switch
setting listed
in
Table
5-2
for
optimum square corner
(see
Fig.
5-16A,
B,
and
C).
Remove
5X
attenuator as required.
j.
ADJUST-CH 2
VOLTS/DIV
switch
series compensation
as given
in
Table
5-2
for optimum square corner
on
the
dis-
play. Readjust the generator output
with
each setting of the
CH
2
VOLTS/DIV
switch
(remove 5 X attenuator as required)
to provide four divisions of deflection.
Fig.
5-l
6D
shows the
location of the variable capacitors.
k.
Disconnect the test equipment
from
the Channel 2
INPUT
connector.
TABLE
5-2
Channel l
and
2 VOLTS/DIV Series Compensation
CH
l
Channel l Channel
2
VOLTS/DIV
Series Series
Switch Setting
Compensation Compensation
SOmV
C6C
Cl06C
. l
C7C
Cl07C
.2
CBC
Cl08C
2
C9C
Cl09C
TABLE
5-3
Channel 2 VOLTS/DIV Shunt Compensation
CH
2
Channel 1 Channel 2
VOLTS/DIV shunt
shunt
Switch Setting
compensation
compensation
20mV
Cl7
Cl
17
50mV
C6B
Cl06B
. l
C7B
Cl07B
.2
CBB
ClOBB
.5
Adjust
Cll
.for
Adjust
Cl
11
for
l
best compromise
best compromise
2
C9B
Cl09B
5-17
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