ranges. Operating
the
8 Sweep
in
a triggered mode provides
a more stable display, since
the
delayed display
is
triggered
at
the
same
point
each time.
1. Perform steps 1 through 6
of
the
preceding
Magnified Sweep Starts After Delay procedure.
2. Set
the
8 (DLY'D) TRIGGER SOURCE switch
to
the
same position
as
the
A TRIGGER SOURCE switch.
3. Adjust
the
8 LEVEL control so
the
intensified zone
on
the
trace
is
stable. (If an intensified zone
cannot
be obtained, see step 4).
4. Inability
to
intensify
the
desired portion indicates
that
the signal does
not
meet
the
triggering require-
ments.
If
the
condition
cannot
be remedied with
the
8 Sweep triggering controls or by increasing
the
display amplitude, you should lower
the
VOLTS/
DIV setting, set 8 (DLY'D) TRIGGER SOURCE
switch
to
EXT, and trigger
the
8 Sweep externally.
5. Measurements are made and magnification factors are
calculated
in
the
same manner described
in
the
Magnified Sweep Starts After Delay procedure.
BASIC 4658 DELAYED SWEEP TIME
MEASUREMENTS
Operating
the
4658
oscilloscope in AL T HOR
IZ
DISPLAY
or
in
A INTEN HORIZ DISPLAY will
permit
time measurements
to
be made with a greater degree of
accuracy
than
attained with A HORIZ DISPLAY.
Time Duration
(Basic
4658)
1. Obtain a Normal Sweep Display (refer
to
Basic
Oscilloscope Displays section
of
this manual). Ensure
that
the
VAR TIME/DIV switch
is
in
the
calibrated
detent.
Depress
either
the
ALT HORIZ DISPLAY
push
button
or
the
A INTEN HORIZ DISPLAY push
button.
2. For
the
most accurate measurement, set
the
8 TIME/
DIV switch
to
the
fastest sweep
that
provides a usable
(visible) intensified zone. Vertically position
the
A
Sweep display
to
place
the
time measurement points
on
the
center horizontal graticule line (see Figure 25).
58
465B/DM44
Operators
@
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