Points per symbol affects all displayed results by controlling result resolution but is
not coupled to span. More points per symbol improves the resolution of the vector
diagram, but there is still only one point at the symbol clock.
# time points = result length × points ⁄ symbol
Result length takes precedence over points per symbol—if you try to set points per
symbol such that the number of time points would exceed the memory size
++
, an
error indicates that the requested number of points per symbol cannot be set. In
this case you may choose to reduce the result length to allow an increased number
of points per symbol. Conversely, if you increase result length such that the
number of time points exceeds the memory limit, points per symbol automatically
decreases to allow the result length to increase.
Feature Availability in Digital Demod
Most features which are available with other instrument modes are also available
with digital demodulation with the following exceptions:
l
Time gating is not available
l
Averaging is not available for any trace data in digital demod but may be
applied to numeric error data in the symbol table. Three types of averaging are
available:
– rms (video)—computes an rms average of each rms error update in
the table
– rms exponential—is like rms (video) except that averaging continues past
the average count with an exponential weighting
– continuous peak hold—keeps track of the peak rms error of each update
in the table
Digital Demodulation Concepts (Opt. AYA)
22 - 12
++ See [
max time points
] under [
System Utility
]
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