Keysight Technologies 3458A Guide D'utilisation page 25

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Keysight 3458A User's Guide
configurations
In general, digital signal processing systems require a
close look at various functions beginning with the
analog signal and ending with results meaningful to
the user. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .480
Direct sampling acquires the wave form in one pass of
the input. Sequential sampling requires a repetitive
signal where the period is reconstructed in several
passes. The numbers shown represent samples
acquired in one period of the input.
The 3458A multimeter provides two different digitizing
paths, the standard DCV path and a track-and-hold
path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .483
Capturing the pulse amplitude of narrow pulses requires
the use of the 12 MHz track-and-hold path. Note, the
minimum time between sample acquisition and trigger
event is 175 nanoseconds.
The trigger event choices shown provide the
versatility needed to match a wide variety of
applications.
Digitizing with the standard triggering command. Trigger
Arming, TARM SGL, 4 allows a measurement cycle
to occur only 4 times, reducing the amount of data
necessary to determine the ratio of the shaded areas
in the input wave form.
Once the trigger arming and trigger event conditions are
satisfied, a burst of measurements can digitize a wave
form as shown in this example.
Using the 3458A as a phase/gain meter with a swept
frequency generator for magnitude only Bode plots.
The DUT can be characterized over frequency with
a phase synchronous trigger to time the
measurement.
Here is a typical way to structure your own automatic
measurement program using the Library Subprograms
(not necessarily a complete list).
Example of results generated using the Wave Form
. . . . . . . . . . . . . . . . . . . . . . . . . . . .453
. . . . . . . . . . . . . . . . . .484
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .485
. . . . . . . . . . . . . . . . . . . . .486
. . . . . . . . . . . . . . .487
. . . . . . . . . . . . . . . . . . . . . . . . . . . .488
. . . . . . . . . . .481
. . . . . . . . . . . . .490
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