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Tektronix T922 - Probe Compensation; Applications

Tektronix T922
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3
.
Set the
INTENSITY
and
FOCUS
controls
for
the
best
defined
display
.
If
the
display
still
appears
out
of
focus,
use
a
small
screwdriver
to
adjust
the
ASTIG
control
(through
left
cabinet
side
of
T921/T922)
for the
best
defined
display
.
4
.
Rotate the
INTENSITY
control
fully
clockwise
.
The
display
will
get
brighter
and
defocus
(get thicker)
.
Return
the
INTENSITY
control
to
the
preferred brightness
level
.
Ext
Z
Axis
Input
Operation
Forthe
T921
orT922
a
positive-going
signal
will
cause
a
decrease
in
intensity,
and
a negative-going
signal
will
increase
the
intensity
level
of
a
low-intensity
trace
.
For
the
T922R,
an
internal
plug allows a
selection
of either
a
positive-going
or
a negative-going
signal
to
cause
a
decrease
in
intensity
.
See
Service
Information
.
X1410
and
Trigger
Operation
1
.
Note
a
display
with
several
cycles
of
the
PROBE
ADJ
waveform
.
Rotate
the
X1-X10
control
fully
clockwise
to
X10and
note
that
only
one
cycle
is
visible
.
Return
control
to
X1
.
2
.
Set
the
SEC/DIV
to
.1
ms
.
Position
the
start
of
the
display
(left-hand
edge)
on
the
screen
.
Set
the
SLOPE
button
to
+OUT
position
.
Rotate
the
LEVEL
control
through
its
range
.
The
start
of
the
display
will
move
along
the
positive
(rising)
slope
of
the
signal
until
the
display
becomes
unstable
.
3
.
Set
the
LEVEL
control
for
a
stable display
that
starts
at
about
the
middle
of
the
slope
.
Now
set
the
SLOPE
button
to
-IN
position
.
Rotate
the
LEVEL
control
through
its
range
.
The
start
of
the
display
will
move
along the
negative
(falling)
slope
of
the
signal
until
the
display
becomes
unstable
.
4
.
Set the
LEVEL
control
for
a
stable
display
that
starts
at
about
the
middle
of
the slope
.
5
.
Set
the
MODE
switch
to
NORM
.
The
display
should
start
on
the
negative
slope
.
In
the
NORM
mode
the
display
will
disappear
if
the
LEVELcontrol
is
improperly
adjusted
.
6
.
Set the
SLOPE
button
to
+OUT
position
.
The
display
should
start
on
the
positive
slope
.
7
.
Disconnect
the
probe
from
the
instrument
.
Set
the
CH
1
AC-GND-DC
switch
to
GND
.
The
trace
should
disappear
.
REV
.
BJUL
1977
Example
:
Operating
Instructions-T921/T922/T922R
8
.
Set
the
SOURCE
switch
to
LINE
.
If
a
trace
doesn't
appear,
adjust
the
LEVEL
control
until
a
trace
appears
.
9
.
Set
:
SOURCE
INT
MODE
AUTO
CH
1
AC-GND-DC
AC
The
instrument
is
now
ready
to
operate
when
signal
is
applied
to
the
CH
1
input
.
PROBE
COMPENSATION
An
incorrectly-compensated
probe
is
one
of
the
greatest
sources
of
operator
error
.
Most
attenuator
probes
are
equipped
with
adjustments
to
ensure
optimum
measurement
accuracy
.
Some
probes
are
compensated
by
using
a
small,
insulated
screwdriver
through
an
access
hole
to
the
.
compensation
adjustment
.
Other
probes
may
have
an
adjustment
system
similar
to
that
shown
in
Fig
.
2-10
.
Probe
compensation
is
accomplished
as
follows
:
Set
the
appropriate
VOLTS/DIV
switch
to
.1
V,
the
AC-
GND-DC
switch
to
DC,
and
the
SEC/DIV
switch
to
2
ms
.
Connect
the
probe
to
the
vertical
input
and
touch
the
probe
tip
to
the
PROBE
ADJ
connector
.
Notice
a
display
similar
to
those
shown
in
Fig
.
2-11
.
Adjust the
probe
for the
correct
compensation
The
effects
of
incorrect
probe
compensation
on
three
types
of
signals
are
illustrated
in
Fig
.
2-11
.
APPLICATIONS
Peak-to-Peak
Amplitude
Measurements
To
measure
the
amplitude
of
a
signal,
multiply
the
vertical
deflection
(in
divisions)
by
the
VOLTS/DIV
switch
setting
.
(Use
VOLTS/DIV
window
to
match
attenuation
factor of
probe
used
.)
The
display
amplitude
is
3
divisions
(see
Fig
.
2-12)
and
the
VOLTS/DIV
switch
is
set
to
.5
V
.
Substituting
the
given
values
:
Amplitude
=3
divisions
x
0
.5
volt/division
=
1
.5
V
p-p
2-1
3

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