Specifications

Frequency
(Basic
4658)
2. Set
the
VOLTS/DIV
switch
and VAR control
(or
rhe rrequency
or a
recurrent
sisnar is determined
by
:llffil
il:l[:i;t lt€n
exact rive-division
disprav
on
computing
the reciprocal
of the time duration
of one
event.
EXAMPLE:
rhe time duration
of one event
(point
A to
t
#::'.T:'J
"i'd'J'l*""*?,,.ttx""""n::
*t:l!H;:l:
Point B, Figure
25) is 16.66 milliseconds.
line and
the top of the waveform
touches the
IOO%
graticule
line
(see
Figure
26).
Using
the
formula
and substituting
the
given
value:
Frequencv
= =
1
= 6oHz
time duration
16.66 ms
Rise
Time
(Basic
4658)
Rise
time
measurements
use
the same
methods
as time
duration, except
that the measurements
are
made
between
the 10% and
90%
points
on the leading
edge
of
the
wave-
form. Falf
time
is
measured
between
the 9oo/o and
1Oo/o
points
on
the
trailing edge
of the
waveform.
1. Obtain
a
Normal
Sweep
Display
(refer
to Basic
Oscilloscope Displays
section
of this
manual).
Use a
sweep
speed
setting
that displays
several cycles
or
events
if
possible
and
ensure
that the VAR
TIME/
DIV control
is in
the
calibrated
detent.
SIGNAL
AMPLITUDE
MEASURE
TIME
FROM
A TO B
HORIZONTAL
DISTANCE
I
I
(465/DM-O-1
1
)2039-29
60
4658/DM44
Operators
Figure
26.
Rise
time.
@