Tektronix T912 - Time Base

Adjustments—
T91
2
C.
TIME
BASE
Equipment
Required
1.
Time-Mark
Generator
3.
50
n BNC
Cable
2.
50 Q
Termination
4.
Low-Capacitance
Alignment
Tool
Preliminary
Control
Settings
ENHANCE
LEVEL
fully
ccw
INTENSITY
midrange
STORE
nonstore
(button
out)
FOCUS
midrange
Vertical
Mode
CH
1
CH
1
VOLTS/DIV
.5 V
(or as
required)
CH 1
VAR
detent
CH 1
AC-GND-DC
DC
CH
2
AC-GND-DC
GND
SEC/DIV
.5
ms
X1-X10
XI
(fully
ccw)
SOURCE
INT
MODE
AUTO
SLOPE
-FOUT
LEVEL
midrange
POSITION
(all)
midrange
Set all
other
controls
as
desired.
The
oscilloscope
should
produce
a baseline
trace
with
the
controls
set
as
above.
Adjust
INTENSITY
and
FOCUS
controls
as
needed
to
maintain
a
well-defined
display
while
making
adjustments.
1.
Horizontal
Calibration
a
Connect
a 50
Q
cable
from
the
time-mark
generator
to a
50
O
termination
at
the
CH 1
input.
Set
generator
for
.5
ms
markers.
(
^
|
b.
ADJUST-Horiz
Cal
R2332
(see Fig.
4-7) and
set
POSITION
controls
for
1 time
marker
per
division
over
center
eight
divisions.
2.
Sweep
Timing
a.
Set
SEC/DIV
to
.5
/js
and
time-mark
generator
for
.5
fjs
markers.
b.
ADJUST-C2235
(see
Fig.
4-7)
and
horizontal
POSITION
control
for
1
marker
per
division
over
center
eight
divisions.
c.
Disconnect
the
test
setup.
Fig.
4-7.
Time
base
adjustment
locations.