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_C
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INTENSIFIED
~®~'\.
..
.
ZONE
.........,;,.;.
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~-
.............
i...,..o""
~"
r=
w
....10
<{
::>
z
t:
(!)...I
-
4.
I/):!:
<{
L
~@"
0
~
f-J
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J,
....
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HORIZONTAL
DISTANCE
---
Fig. 30. Risetime.
MEASURE
TIME FROM
ATO
B
1737·13
exactly a five-division display. Set vertical positioning so
the display bottom touches the
0% graticule line and the
display
top
touches the 100% graticule line (see Fig. 30).
Set the A
TIME/DIV
switch
for
a single-event display
with
the risetime spread
horizontally
as
much
as
possible.
Horizontally
position the
display
so the 10%
point
of
the
waveform intersects the second vertical graticule line (see
Fig.
30). Set the B
TIME/DIV
switch
to
the fastest sweep
speed that provides a usable (visible) intensified zone.
Use the DELAY
TIME
POSITION dial
to
move
the
start
of
the intensified zone (left-hand edge)
to
just
touch
the
intersection
of
the signal and the 10%
graticule
line (see
Fig.
30,
Point
A).
Note
the DELAY
TIME
POSITION
dial
setting.
Use the DELAY
TIME
POSITION dial
to
move
the
start
of
the intensified zone
to
just
touch
the intersection
of
the
signal and the
190%
graticule
line (see Fig. 30,
Point
B).
Note the DELAY
TIME
POSITION dial setting.
Substitute the DELAY
TIME
POSITION dial settings in
the time difference
formula
to
find the risetime.
EXAMPLE: The A
TIME/DIV
switch is set
to
1 µs. The
DELAY
TIME
POSITION dial setting at
point
A (Fig. 30) is
2.50 The DELAY
TIME
POSITION dial setting at
point
B
(Fig.
30)
is
7.50.
To
find the risetime use the formula:
Time
. .
D
.ff =
R1set1me
=
1 erence
[
second first ]
dial dial X
setting setting
delay time
(A
TIME/DIV
setting)
56
466/464 DM44 Operators
@
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