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BASIC 466/464 DELAYED OR MIXED SWEEP TIME MEASUREMENTS
The
delayed
sweep
modes
can be used
to
make more accurate time measurements.
TIME
DIFFERENCE BETWEEN
REPETITIVE PULSES (BASIC 466/464)
Obtain
a Delayed Sweep Display. For
the
most
accurate
measurement,
set
the
B
TIME/DIV
switch
to
the
fastest
sweep
speed
that
gives
usable
(visable)
intensified
zones.
With
the
HORIZ
DISPLAY
switch
set
to
A INTEN, use
the
DELAY
TIME
POSITION
dial
to
move
the
intensified
zone
to
the
first
pulse
(see Fig. 27 A).
Set
the
HORIZ
DISPLAY
switch
to
B
DL
Y'D.
Adjust
the
DELAY
TIME
POSITION
dial
to
move
the
pulse
(or
rising
portion)
to
some vertical reference line (see Fig.
278).
Note
the
setting
of
the
DELAY
TIME
POSITION
dial.
Turn
the
DELAY
TIME
POSITION
dial
clockwise
to
move
the
second
pulse
to
the same vertical reference line (if several
pulses
are
displayed,
return
to
A
INTEN
to locate
the
correct
pulse).
Do
not
change
the
settings
of
the
horizon-
tal
POSITION
and FINE
controls.
Note
the
setting
of
the
DELAY
TIME
POSITION
dial.
Determine
the
time
difference
using
the
following
formula:
Time Difference =
[
second
dial
setting
first
l
dial
setting
delay
time
X A
TIME/DIV
setting
EXAMPLE: Assume the
first
dial
setting
is
1.31
and
the
second dial setting is
8.81
with
the
A
TIME/DIV
switch
set
to
0.2
µs
(see Fig. 27).
Using the formula:
Time Difference
=
[
]
delay
time
second
dial_
first
dial
X (A
TIME/DIV
setting
setting
setting)
Substituting the given values:
Time Difference
= (8.81 - 1.31) X 0.2 µs.
The
time
difference
is
1.5
microseconds.
@
466/464
DM44
Operators
51
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