Tektronix 2246 User Manual

Measurement
Processes
and
Applications—
2246
Operators
To
enable
the
TRACK
TRIG
LVL
cursors,
press
the
CURSORS
button
to
call
up
page
one
of
the
menu.
The
last
selection
in
the
menu
is
“TO
AUTO
TRACKING
MENU."
Press
the
menu
select
button
for
that
choice
to
display
page
2
with
the
tracking
cursor
choices.
All
of
the
choices,
TRACK
MEASMT,
TRACK
TRIG
LVL,
and
TRACK
rh,
may
be
underlined,
but
they
cannot
all
be
displayed
at
the
same
time.
Only
two
cursors
at
a
time
are
permitted.
If
enabled,
but
not
displayed
in
a
particular
waveform,
omitted
cursors
will
be
displayed
when
a
higher
priority
cursor
is
turned
off.
TRACK
MEASMT
cursors
take
priority
over
the
TRACK
rh
cursor
when
TRACK
TRIG
LVL
is
also
enabled.
In
ALT
Horizontal
MODE
the
TRACK
rh
cursor
for
the
A
Trigger
signal
is
higher
in
priority
than
the
B
Trigger
Level
cursor.
The
cursors
displayed
when
a
CURSORS
measurement
is
called
take
priority
over
all
the
Auto
Tracking
Cursors.
NOTE
The
CLEAR
DISPLAY
button
will
turn
off
the
TRACK
TRIG
LVL
and
TRACK
rj,
cursors
if
pressed
the
appropriate
number
of
times.
To
enable
either
or
both
of
these,
it
is
necessary
to
re-enter
the
CUR-
SORS
menu
and
reselect
them.
.
The
TRACK
MEASMT
cursors
are
also
turned
off
by
the
CLEAR
DISPLAY
button,
but
the
function
is
not
turned
"off;
the
TRACK
MEASMT
cursor(s)
will
be
displayed
again
„when
a
CH1/CH2
VOLTMETER
measurement
is
cail
up.
Setting Trigger Level
The
trigger
level
readout
supplied
by
the
TRACK
TRIG
LVL
cursor
may
be
used
to
set
a
specific
trigger
level
for
triggering
on
a
displayed
waveform.
As
an
example,
assume
the
following
conditions:
1.
The
signal
to
be
examined
is
a
mix
of
two
different
signal
levels
(see
Figure
6-17).
2.
We
want
to
trigger
on
the
larger
amplitude
signals
to
make
a
closer
examination
of
their
waveshape
and
take
pulse
width
and/or
rise
time
measurements.
To
set
the
Trigger
LEVEL
to
the
appropriate
level
with
no
signal
applied
(or
with
GND
input
coupling)
use
the
TRACK
rh
cursor
feature.
(The
TRACK
rh
cursor
menu
choice
is
reached
through
the
same
menu
path
as
the
TRACK
TRIG
LVL
cursor.)
The
ground
cursor
provides
feedback
to
the
user
so
that
the
ground
level
may
be
posi-
-tioned
without
the
need
for
a
ground
baseline
trace.
6-20
QUESTION MARK
APPEARS WHEN
B SWEEP IS NOT
RUNS AFTER
A TRIGGER
LEVEL
CURSOR
B TRIGGER
LEVEL
CURSOR
Figure
6-16.
A
and
B
TRACK
TRIG
LVL
cursors.
Set
the
VOLTS/DIV
control
so
that
the
displayed
signal
will
have
a
good
viewing
amplitude.
For
the
assumed
sig-
nal
shown
in
Figure
6-17,
a
setting
of
1
V/div
will
produce
a
four
to
five
division
display
amplitude.
Position
the
ground
cursor
(using
the
VERTICAL
POSITION
control)
at
about
two
graticule
divisions
below
the
center
graticule
line.
(For
negative-going
signals,
two
divisions
above
the
center
graticule
would
about
center
the
display;
and
for
bipolar
signals,
centering
the
ground
trace
is
appropriate.)
Zeroing
the
Trigger
LEVEL
control
may
be
useful
if
the
cursor
is
positioned
out
of
the
viewing
area.
Simply
switch
the
Input
COUPLING
of
the
selected
channel
to
GND
and
switch
the
Trigger
MODE
to
AUTO
LEVEL.
Once
zeroed,
set
the
Trigger
MODE
to
NORM
so
that
the
Trigger
LEVEL
you
set
will
be
maintained.
(if
AUTO
LEVEL
is
left
on,
the
Trigger
LEVEL
will
continue
to
follow
the
applied
signal;
ground
in
this
case.)
Use
the
Trigger
LEVEL
control
to
position
the
trigger
level
cursor
to
about
3
V
(measured
from
the
ground
cursor).
For
the
assumed
signal,
this
level
is
ample
to
avoid
triggering
on
the
lower
amplitude
signals
in
the
display.
For
other
waveforms,
the
user
must
deter-
mine
what
trigger
level
is
needed
to
obtain
triggering
on
a
specific
waveform
amplitude.
Apply
the
signal
to
the
appropriate
input
channel
con-
nector,
and
set
the
Input
COUPLING
to
DC.
The
N,
~.
pi |

Tektronix 2246 Specifications

General

Brand	Tektronix
Model	2246
Category	Test Equipment
Language	English