Keysight Technologies 3458A Guide D'utilisation page 488

E High Resolution Digitizing With the 3458A
the 3458A multiplies the number of readings by the time interval and divides by
the minimum time between samples.
Delay can be used in conjunction with external trigger synchronization to window
your measurement to examine the parts of the wave form you want to see in
detail. For example, consider using the 3458A as a broadband phase/gain meter
with a 3325A source to measure the transfer function of a passband filter over a
frequency range of 0.5 to 5 MHz. Refer to
MHz so the minimum time between samples for entire band is 100 ns for two
samples per cycle. Two methods suggest themselves for this analysis: (1) sweep
the entire frequency spectrum at 100 ns interval or (2) divide the frequency
spectrum into bands and sweep these bands at the 1/(2f
first case, the data acquisition time is minimized, in the second case the need for a
fast computer is minimized.
Figure E-8
488
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.
Figure E-8. The highest frequency is 5
) for the band. In the
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Keysight 3458A User's Guide