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EZ Digital OS-3060D Especificações Página 71

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6.
If
you multiply the value mea
sur
ed in Item 5 above by the value set
by the TIM
E/D
IV switch. the time you wish to measure will be
obtained. If the T1MEIVRIAI:lLE knob 1251i, pulled
(X I(J magnified
mode). divide the measured value by
10.
(2) Period. Pulse Width. and Duty Cycle Measurement
If you make good usc of the measurement based on the basic technique.
you can also measure the period of
pulse, pulse width,
and
dury cycle,
etc. When a complete period of pulse of the signal appears on the CRT
screen display, the period of pulse of that time can be measured.
F
or
example, if the TIME
/D
IV switch were .set to lOms, the measured value
of
one
cycle between A and C in Fig. 2-9 would be a waveform having a
period of cycle of IOmsX7= 70ms.
The pulse width represents the time between
A and B.
In Fig. 2-IS, it is
1.5
division so that it becomes 1.5divX IOms=
15ms. However, in this example, as an 1.5 divisi
on
is a rather short
distance, should you set the
TIME
/ON
switch to 2ms, it would be seen
magnified as shown on Fig. 2-ISb.
Then, though the pulse is short, the measurement accuracy becomes
increasingly better. Where it is still displayed small even with
adjusting the TIME
/DN
switch, it is advisable to perf
orm
the
measurement under XIO magnified condition by pulling the A VARIABLE knob
(25).
When pulse width and period are
kno
wn, dury cycle
can
be calculated.
Duty cycle is the percentage against ON-time of the pulse period (total
of
ON-a
nd
OFF
-time).
In Fig. 2-IS: the duty cycle is as follows :
D ty I
(%)
=
Pul
se width X100- A B
u cyc e Period - A C
(e. g) Duty cycle
(%)=
j
~
:
~
X 100=21.4%
X 100
lit Mea
sur
e the cycle by moving cursor. Then measure the pulse width.
The dury cycle of required wavef
orm
is obtained by applying the
measured value to the formula.
71
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