Operating instructions
Operating
Instructions-71380
8
.
Multiply
the
horizontal
distance
measured
in
step
7 by
the
TIME/DIV
switch
setting
.
(Divide
the
answer by 10
if
sweep
magnification
is
used
.)
Example
:
Assume
that
the
horizontal distance
from
the 10
to
90%
points
is
2
.5
divisions
and
the
TIME/DIV
switch
set-
ting
is
.1
p
.s
(see
Figure
1-7)
.
Using
the
formula
:
Horizontal
distance
TIME/DIV
Rise
Time
=
(divisions)
X
setting
Substituting
values
:
Rise
Time
=
2
.5
x
0
.1
ps =
0
.25
microsecond
1
Pulse
Width
Measurements
Magnification
Perform the
following
procedure
to
measure
the
pulse
width
of
a
displayed
waveform
:
1
.
Install
the
time-base
unit
in
a
mainframe
horizontal
compartment
(either
A
or
B
horizontal
in
a
four-compart-
ment
mainframe)
.
2
.
Connect
the
signal
to
be
measured
to
the
vertical
unit
input
.
3
.
Set the
mainframe
horizontal-
and
vertical-mode
switches
to
display
the
time
base
and
vertical
unit
.
(Check
that
the
time
base
VARIABLE
(CAL
IN)
control
is
pushed
in
and
the
HOLDOFF
control
is
in
the
MIN
position
.)
4
.
Set
the
TRIGGERING
switches
and
LEVEL
control
for
a
stable
display
(see
General
Operating
Information
for
selecting
proper
triggering)
.
5
.
Set
the
vertical
deflection factor
and
position
control
for
about
a
5-division
pulse
vertically
centered
on
the
graticule
.
6
.
Set the
TIME/DIV
switch
and
POSITION
control
for
1
complete
pulse
displayed within
the
center
8
graticule
divi-
sions
as
shown
in
Figure
1-8
.
7
.
Measure
the
horizontal
distance
in
divisions
between
the
50%
amplitude
points of
the displayed
pulse
(see
Figure
1-8)
.
1-
1
2
8
.
Multiply
the
horizonal
distance
measured
in
step
7 by
the
TIME/DIV
switch
setting
.
(Divide
the
answer
by
10
if
sweep
magnification
is
used
.)
Example
:
Assume
that
the
horizontal distance
between
the
50%
amplitude
points
is
3
divisions,
and
the
TIME/DIV
switch
setting
is .1
ms
(see
Figure
1-8)
.
Using
the formula
:
Horizontal
TIME/DIV
Pulse
Width
=
distance
X
setting
Substituting
values
:
Magnification
Pulse
Width
=
3
X
0
.1
ms
= 0
.3
millisecond
1
DELAYED-SWEEP
MEASUREMENTS
The
time-base
unit
may
be
used
with a
delaying
time-base
unit
in
a
mainframe
with
two
horizontal
compartments
to
make
delayed-sweep
measurements
.
See
the
Tektronix
Products
Catalog
for
compatible
delaying
time-base
plug-in
units
.
If
a
compatible
delaying
time-base
unit
is
available,
refer
to
the
instruction
manual
for
that unit
for
detailed
delayed-sweep
measurement
procedures
.
X-Y
PHASE
MEASUREMENTS
The
phase
difference
between
two
signals
with
the
same
fre-
quency
can be
measured
with a
71380
Option
2
and
ampli-
fier
plug-in
units
.
Refer
to
the
Instrument
Options
section
of
this
manual
for
detailed
procedures
.
io
90
A
B
I
I
I
I
1
I
.
.I
. . . .
. .
.I
.
. .
PULSE
WIDTH
0
MEASURE
HORIZONTAL
DISTANCE
FROM
A
TO
B
1985-12
Fig
.
1-8
.
Measuring
the
pulse
width
of
a
displayed
waveform
.