Operating instructions

9
.
Determine
the
frequency
of
the
displayed
waveform
ob-
tained
in
steps
1
through
8
by
taking the
reciprocal
of the
period
of
1
cycle
.
Example
:
Assume
that
the
period of the
displayed
wave-
form
is
0
.7
millisecond
.
Using
the
formula
:
Frequency
=
1
Period
Substituting
values
:
Frequency
=
1
=
1
.43
kilohertz
0
.7
ms
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
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
switch-
es 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
dis-
play
the
rising
or
falling
portion
of the
waveform
within
the
center
8
graticule
divisions
as
shown
in
Figure
1-7
(see
General
Operating
Information
in this
section
for
discussion
of
timing
measurement
accuracy)
.
7
.
Determine
rise
time
or
fall
time
by
measuring
the
hori-
zontal
distance
in
divisions
between
the
point
on
the
rising
NOTE
Operating
Instructions-71380
RISE
TIME
FALL
TIME
1985-11
A
Fig
.
1-7
.
Measuring
the
rise
time
and
fall
time
of
a
displayed
wave-
form
.
or
falling
portion
of the
waveform
that
is
10%
and
the
point
that
is
90%
of
the
total
display
amplitude
(see
.
Figure
1-7)
.
The
left
edgeof
the oscilloscope
graticule
is
scribed
with
0,
10,
90,
and
100%
lines
for
con-
venience
when
measuring
rise
time
or
fall
time
.
To
use
this
feature,
adjust the
vertical
deflection
factor
and
position control
to
fit
the display be-
tween
the
0and100%
graticule
lines
.
Then
measure
the
horizontal
distance
between
the
points
where
the
waveform
crosses
the
10%and
90%
graticule
lines
.
AMIMEM
o
~1
NEENN
1I
W
"
mm~
I~ICPIP
MEASURE
HORIZONTAL
DISTANCE
FROM
A
TO
B
(10%
TO
90%)
a
fttW
a
q
Egg
WITIM
M
E
ONE
ME
E
MEN
1
Em
MMUNNIN
0
p
.
.
. .
.
. .
MEASURE
HORIZONTAL
DISTANCE
FROM
A
TO
B
(90%
TO
10%)