Operating instructions
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
display,
vertically
centered
on
the
graticule
.
6
.
Set the
TIME/DIV
switch
and
POSITION
control
for
1
complete
cycle
displayed
within
the
center
8
graticule
divisions
as
shown
in
Figure
1-7
.
7
.
Measure
the
horizontal
distance
in
divisions
over
1
complete
cycle
of
the
displayed
waveform
(see
Fig
.
1-7)
.
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 over
1
complete
cycle
is
7
divisions,
and
the
TIME/DIV
switch
setting
is
0
.1
ms
(see
Fig
.
1-7)
.
Using
the
formula
:
Period
=
Substituting
values
:
Horizontal
distance
x
TIME/DIV
(divisions)
setting
7
x
0
.1
ms_
Period
=
-
-----
----
--
0
.7
millisecond
9
.
Determine
the
frequency
of
the
displayed
waveform
obtained
in
steps
1
through
8
by
taking
the
reciprocal
of
the
period of
1
cycle
.
Figure
1-7
.
Measuring
the
period
and
determining
the
frequency
of
a
displayed
waveform
.
REV
A
MAR
1981
Example
:
Assume
that
the
period
of
the
displayed
waveform
is
0
.7
millisecond
.
Using
the
formula
:
Frequency
=
-
~--
_
Period
Substituting
values
:
Frequency
ms-=
1
.43
kilohertz
Operating
Instructions---71387
RISE-TIME
AND
FALL-TIME
MEASUREMENTS
Perform
the
following
procedure
to
measure
the
rise
time
and
fall
time
of
a
displayed
waveform
:
1
.
Install
the
time-base
unit
in
a
mainframe
horizontal
compartment
(either
A
or
B
Horiz
in
a
four-compartment
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
the
vertical
unit
.
(Check
that
the time
base
VARIABLE
(CAL
IN)
control
is
pushed
in
and
the
HOLD
OFF
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
a
vertically-centered
display
with
an
exact
number
of
divisions
of
amplitude
.
6
.
Set the
TIME/DIV
switch
and
POSITION
control
to
display
the
rising
or
falling
portion
of
the
waveform
within
the
center
8
graticule divisions
as
shown
in
Figure
1-8
(see
General
Operating
Information
in
this
section
for
discussion
of
timing
measurment
accuracy)
.
7
.
Determine
rise
time
or
fall
time by
measuring
the
horizontal
distance
in
divisions
between
the
point
on
the
rising
or
falling
portion
of
the
waveform
that
is
10%
and
the
point
that
is
90%
of
the
total
display
amplitude
(see
Fig
.
1-8)
.
NOTE
The
left
edge
of
the
oscilloscope
graticule
is
scribed
with
0,
10,
90,
and
100%
lines
for
convenience
when
measuring
rise
time
or
fall
time
.
To
use
this
feature,
adjust the
vertical
deflection
factor
and
position
control
to
fit
the
display
between
the
0
and
100%
graticule
lines
.
Then
measure
the
horizontal
distance
between
the points
where
the
waveform
crosses the
10%
and
90%
graticule
lines
.
1-
1
3