Alternate And Chop Sweep Modes - HP 8753E User Manual

Alternate and Chop Sweep Modes

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menu to activate either one or the other sweep modes. For information about sweep types,
refer to "Sweep Type Menu," located earlier in this chapter.
Alternate
unwanted signals, such as crosstalk from sampler A to B when measuring B/R. Thus, this mode
optimizes the dynamic range for all four S-parameter measurements.
The disadvantages of this mode are associated with simultaneous transmission/reflection
measurements or full two-port calibrations: this mode takes twice as long as the chop mode to
make these measurements.
Chop
the
during each sweep. Thus, if each channel is measuring a different parameter and both channels
are displayed, the chop mode offers the fastest measurement time. This is the preferred
measurement mode for full two-port calibrations because both inputs remain active.
The disadvantage of this mode is that in measurements of high rejection devices greater than
85 dl3, such as tilters with a low-loss passband, maximum dynamic range may not be achieved.
Figure 6-57 shows the a2termate sweep mode (bold trace) overlaying the chop sweep mode in
a band-pass filter measurement. Note the difference in the crosstalk levels between the two
modes
Figure 6-57. Alternate and
default measurement mode. This mode measures both inputs A and B
Chop
Sweeps Overlaid