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8.3
Trace
Expansion
- Expand AIB
Using the same i00 nsec signal and front panel settings described in
Section 8.2, but with your pulse generator
free-running
this time,
perform the following procedure:
I)
Set push button (14) to DUAL GRID mode.
2)
Press EXPAND A (46) in order to expand CHAN 1 trace.
If the source for signal expansion shown in the Displayed Trace field
(V) is not X-Chan
I, you must perform
the following
procedure
redefine the expansion signal source to CHAN i.
a)
Press the REDEFINE
push button (45) to display
the Redefine
Source menu in the Menu Field (I).
b)
Press push button (I) in order to redefine CHAN I as the new
source for the expanded (X-Chan i) display.
At this point the new source for the expanded (X-than i) line in the
Displayed Trace Field (V) is updated to X-Chan I and all or a portion
of CHAN 1 trace is intensified.
3)
Turn the TIME MAGNIFIER control (43) to adjust the magnification
factor
(length
of the intensified
section)
as desired
(e.g.
5 nsec).
4)
Displace
the
intensified
section
by adjusting
Horizontal
POSITION
control
(39)
and position
it
on the
risetime
of your
pulse.
5)
Position
the
expanded
trace
in lower
grid
by adjusting
the
Vertical
POSITION control
(40).
6)
Adjust
VERT GAIN control
(42)
if
required.
At this
point
the
digitized
points
are
clearly
seen
every
10 nsec.
7)
Set INTERLEAVED SAMPLING to ON.
The equivalent
sampling
frequency
is
now 5 gigasamples/sec
and
the
risetime
of the
pulse
is
very
clearly
defined.
Note: The procedure to follow for Expand B is identical to the above,
except that in Step 2 the EXPAND B push button (46) is pressed rather
than the EXPAND A push button.
8-5
Basic 9400A gaveform Measurements
and Operating Procedures
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