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Tektronix 47E5A

Tektronix 47E5A
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Fig. 28,
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 90%
grat
i
cule
line
(see Fig. 28,
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.
SIGNAL
AMPLITUDE
-~
INTENSIFIED
ZONES
HORIZONTAL
I
DISTANCE
I-
MEASURE
TIME
FROM
A
TO
B
(4
6 5/
DM
·0-
ll
)
2039
·
29
Fig.
28
. Risetime.
EXAMPLE:
The
A
TIME
/
DIV
switch
is set
to
1 /1S. The
DELAY
TIME
POSITION
dial
setting at
point
A (Fig. 28) is
2.50
The
DELAY
TIME
POSITION
dial
setting
at
point
B
(Fig. 28)
is
7.50.
To
find
the riseti
me
use
the
formula
:
Time
R"
D
'ff
= Isetlme =
I
erence
[
second
dial
setting
first
]
dial
setting
Substitut
ing
the
given values:
delay
time
X (A
TIME
/
DIV
setting)
Risetime
=
(7
.50 - 2.50) X 1 /1S = 5 ms.
MIX
(BASIC 475A)
For
the MIX
mode
of
operation,
the same general
procedures
can be used. With the first
part
of
the
display
at
a sweep rate set
by
the A
TIME
/ DIV
switch
and the second
part
of
the
display
at a
sweep
rate set
by
the B
TIME
/DIV
switch
, it is not necessary to
switch
display
modes
to
ensure
location
of
the
correct
pulse.
However
.
inaccuracies
are
introduced
into
the
me
a
surement
by
the
transition
from A
to
B sweeps.
The
B
DL
Y'D
mode
is the
most
accurate
and
therefore
recommended
mode
of
making
differential
time
measurements
.
@ 475A/OM44 Operators
53

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