Vertical Deflection Accuracy - Tektronix 465B Instruction Manual

Calibration
Procedure— 465B
Service
Adjustment Procedure
11.
Check
CH
2
and
CH
1
Gate
Current
a.
Set:
AC-GND-DC
(both)
GND
VOLTS/DIV
(both) 5
mV
b.
Position trace to
graticule center
and change
AC-
GND-DC
switch
to
DC.
c.
CHECK—
Trace
shift
is
0.1
division or
less,
when
switching
between
GND
and DC.
a.
Set:
VERT
MODE
CH
2
CH
2
VOLTS/DIV
5
mV
CH
2
AC-GND-DC DC
b.
Connect
calibration
generator standard-amplitude
output
to
CH
2 input via
50
Q
bnc cable.
Setthe generator
for
20
mV
output.
c.
CHECK
—
Display
is
4
divisions
within
3%
(4
divisions
±0.12
division).
d.
Set
VERT
MODE
switches to display
CH
1.
Position
trace to graticule
center
and change
AC-GND-DC
switch
to
DC.
e.
CHECK—
Trace
shift
is
0.1
division or
less,
when
switching
between
GND
and DC.
f.
Set
both
AC-GND-DC
switches
to
DC.
12.
Check/
Adjust Gain (R1482, R2025, R1882)
(R1482, R2005,
R1882 below
SN
B030000)
NOTE
It is
not always necessary
to
do
a
complete
readjust-
ment
to
meet instrument gain specifications.
Use
following
procedure
to
determine required ad-
justments.
d.
Change
CH
2
VOLTS/DIV
and
calibration
generator
settings as
shown
in
Table 4-9
and check
that
deflection
accuracy
is
within
3%
for
all
VOLTS/DIV
settings
listed.
e.
Set
VERT
MODE
Switches to display
CH
1
and
set
the
CH
1
AC-GND-DC
switch
to
DC.
f.
Move
the input
signal
from the
CH
2input connector
to
the
CH
1
input
connector.
g.
CHECK—
Display
is
4
divisions
within
3%
(4
divisions
±0.12 division).
h.
Change
CH
1
VOLTS/DIV
and
calibration
generator settings
as
shown
in
Table
4-9
and check
that
deflection
accuracy
is
within
3%
for
all
VOLTS/DIV
settings
listed.
Table
4-9
VERTICAL DEFLECTION
ACCURACY
Volts/Div
Setting
Calibration
Generator
Amplitude
Deflection
in
Dlv
For
3%
Accuracy Reading
In
Dlv
Divisions
Accuracy
10
mV
50
mV
5
±0.15
div
4.85 to 5.15
20
mV
0.1
V
5
±0.15 div
4.85 to 5.15
50
mV
0.2
V
4
±0.12
div
3.88
to
4.12
.1
V
0.5
V
5
±0.15
div
4.85 to 5.15
.2
V
1
V
5
±0.15
div
4.85 to 5.15
.5
V
2
V
4
±0.12
div
3.88 to 4.12
1
V
5
V
5
±0.15
div
j
4.85 to 5.15
2
V 10
V
5
±0.15
div
4.85 to 5.15
5
V 20
V 4
±0.12
div 3.88 to 4.12
4-30
REV A SEP
1979