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EZ Digital OS-3060D Specifiche Pagina 77

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10.For any instrum
ent
equipped with READOUT function mcasuriug A
and
B
values after moving cursor as shown in the figure makes it possible
to ca lculate the
pha
se difference (8).
2-3-5. Ris
ctim
e
Measurem
ent
Rise time is the time required for the Icadi ng edge
of
a pulse to rise
from 10% to 90%
of
the total pulse amplitude. Fallti rnc is the time
required for the trailing edge
of
a pulse 10 drop from 90%
of
the total
pulse amplitude to 10%. Risctime and falltime, which may be
collectively called transition time, are mea
sur
ed essentially in the
same
manner
.
To mcasure rise and fall time, procccd as follows :
I. C
onnec
t the pulse you wish to measure to the CH I
IN
con
nector (91,
and
set
the
AC-DC,
GN
D switch
III
1 10 AC.
2. Adjust the
TIM
E
/DIV
switch
[::'::'1
to display about 2 cycles of the
pulse. Make sure that the TIME VARIABLE control
1::'51
is rotated
fully clockwise
and
pushed in.
3. Center the pulse vertically by adjusting the CH I vertical POSITION
11
71·
4. Adjust the CHI VOLTS
/D
IY switch
1131
so as to make top
of
the pulse
be closest to the 100% graticule line,
and the bott
om
of
the pulse
be closest
10 the 0% line.
Wher
e the
cor
respondence is not ma de,
then
rotate the VARIAB LE
contro
l [15J slightly counterclockwise with
making graticulc lines
of
both sides deviate a little to make the
both
pulse peaks rest exactly
on
the 100% and 0% graticule lines,
respectively.
(See
Fig. 2
-2f)
.
5.
Adj
ust the hori
zont
al
POSITION
c
ontrol
126J and
mak
c the ri
sin
g
edg
e
rest
on
the central vertical graticule line (crosses at the 10%
poin
t) .
6. If the risetime is sloas
com
pared to the peri
od
, no further
magnificati
on
is necessary. If, however, the risetime is as short
as to correspond al
mos
t to the vertical graticule line, make an
adj
ustment as described in Item 5 above by pulling the
TIME
VARIABLE
/PULL
XIO
MAG
control [251 (See Fig. 2·21(
b)).
77
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