Tektronix T912 - First Time; Operation; Vertical Input

Operating
Instructions—
T912
FIRST
TIME
OPERATION
Use
this
procedure
when you
turn
the
instrument
on for
the first
time. It checks
that most
functions
of
the
instrument
are
operational.
This
procedure
requires a
probe.
(1
OX
probes are
supplied as
standard
accessories.)
Read
the descriptions
of
the
controls
and
connectors
to
familiarize
yourself
with them
before
you turn
your
instrument on.
A
complete
performance
check is
given
in Section
3.
Only the
control
settings
that
affect
the check being
performed
are
given. Do
not move
the
control
settings
unless
instructed
to do so.
Start
at
the
beginning and
follow
the
sequence
of
steps
through
to
the
end. if you
skip
a
step or
start in
the middle
of
a
check,
you
won't be
able
to
tell
whether
a
particular
function
is
operational.
Check
that
the 120
V/240 V
and
HI/LO
switches
are
properly
set
(see
Operating
Voltage,
page
2-1).
If the 120 V/240
V and HI/LO
Switches
are
properly
set,
connect the
power
cord
plug to
the
power
source and
turn
the
instrument
on.
Set the
trigger
MODE
to AUTO,
and
SOURCE
to
INT.
You
should
get a
trace on
the
crt
screen.
If you
don't,
push the
BEAM
FINDER
button
and hold it
in
while
increasing
the
INTENSITY
(clockwise).
A
trace, or one or
two bright
dots,
indicates that the
instrument
isoperating.
You may
also
have to
adjust
the FOCUS
and
POSITION
controls.
2.
Check that
the CH 1
POSITION
control moves the
trace off the top
and
bottom of
the
screen.
Leave the
trace
between one
and two
divisions above the
center line.
If the
trace
does
not
extend across
the screen,
move the
horizontal
POSITION
control
until it does.
3.
Set the
Vertical
Mode switch
for
CH
2. Check
thatthe
CH 2
POSITION
control
moves
the trace
off
the
top
and
bottom of
the
screen.
Leave
the trace
between one and
two
divisions
below the
center
line.
4. Set
the
Vertical Mode
switch
for DUAL TRACE.
You
should have two
traces
on the
crt screen—
one above
the
center
line
and
one below.
5.
Check
that there are
two traces at
every setting of
the
SEC/DIV
switch
from
.5
/us
to .5 s.
6.
Set the
SEC/DIV
switch
to 1 ms and the
Vertical
Mode switch to
CH 1.
FOCUS
and
INTENSITY
Operation
Adjust
the FOCUS
and the
INTENSITY
controls
for
a
fine
line at a
comfortable
brightness
level.
Trace
Rotation
and
Vertical Input
Operation
Most of
the
remaining
checks
require
applying
the
PROBE ADJ
signal to
the inputs.
Vertical
Positioning
and
Horizontal
Operation
1. Set:
LEVEL
SEC/DIV
X1-X10
Vertical Mode
STORE
mid-range
1 ms
X1 (fully c
detent)
CH 1
nonstore
(button
OL
NOTE
In the
following
steps,
if you
use
a IX
probe
or
coaxial
cable,
use
the
1X
PROBE
window
for
VOLTS/DIV
settings.
If you
use a
10X probe (as
supplied),
use
the 10X
probe
window.
The
PROBE
ADJ
output
is a
square
wave. An
incorrect-
ly
compensated
probe
will
distort
the top and
bottom
of
the
signal
but
will
not affect
the checks.
REV
B,
DEC
1978
27