Tektronix 2247A

Basic Applications
Time
Measurement
Cursors
Time
measurement
cursors
may
be
used
on
any
of
the
input
waveforms
In
the
A
Horizontal
MODE.
(Time
measurements
are
also
available
in
ALT
and
B
Horizontal
modes;
see
“Time
Delay
Measurement”
in
this
section.)
The
units
of
the
time
cursors
may
be
selected
to
provide
some
automatic
calcu-
lations
for
the
user.
The
units
of
the
—
SEC
-4
cursors
are
time
(s,
ms,
us,
and
ns),
the
le
1/SEC
>|
cursors
have
units
of
frequency
(Hz,
KHz,
and
MHz),
and
the
I
PHASE
-4
cursor
units
are
in
degrees
and
scaled
toa
360
degree
reference
set
by
the
user.
Time Difference
Use
the
following
procedure
steps
as
a
guideline
in
making
time
difference
measurements
using
the
|
SEC
>|
cursors.
As
with
the
le
VOLTS
cursors,
the
-
OR
DELAY
control
positions
both
cursors
together,
and
the
-A
control
positions
the
independent
cursor.
1.
Apply
the
signal
to
the
Input
connector(s).
2. Set:
VERTICAL MODE as desired
Horlzontal MODE A
3. Press AUTO SETUP button,
4.
Select
a
SEC/DIV
setting
that
provides
the
fewest
number
of
cycles
of
the
applied
waveform
necessary
to
display
the
measurement
points
of
Interest.
This
Is
to
Improve
the
accuracy
of
cursor
placement
for
the
measurement.
5.
Press
TIME
button
and
select
-
SEC
3|
from
menu.
NOTE
The
Independent
cursor
cannot
be
positioned
in
front
of
the
reference
cursor.
6.
Use
the
l-
OR
DELAY
control
to
position
the
reference
cursor
to
the
point
on
the
waveform
to
be
measured
from.
Use
the
-{
control
to
position
the
Independent
cursor
to
the
second
point
of
interest.
Then,
read
the
time
difference
value
In
the
top
line
of
the
crt
readout.
2247A Operators
ES
ca
a
cn