Agilent Technologies HP 8642A/B Specifiche Pagina 272

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Ranges
The Measurement Range entries in the Segment Table define the measure-
ment bandwidth of each segment. The Plotted Range entry defines what
portion of the measured data will be plotted on the Results Graph. The
Plotted Range can be the same as, or a subrange of the Measurement
Range within the following limitation:
,,. . _. . _ Measurement Range
Minimum Plotted Frequency >
H J
~ 100
Considerations for Changing Measurement Ranges
Due to the possible steepness of the slope of the phase noise curve
slope, spurs are not marked for offset frequencies less than 10% of the
Measurement Range.
Measurement Range
J
10
/
frequency offset for which spurs are not marked
Minimum Averaging
The Minimum Average value designates the minimum number of mea-
surements the HP 3048A will make for a given Measurement Range. The
values entered in the segment table may or may not be used depending
on the minimum number of averages specified in the measurement
def-
inition. (Refer to Type/Range in Chapter 2, Measurement Definitions for
further information about defining the minimum number of averages for
the measurement.) The actual minimum number of averages used is the
larger of the two averages specified.
For example, if the measurement definition specifies 4 as the minimum
number of averages, and the Segment Table specifies 30 as the minimum
number of averages for a given Measurement Range; the software will use
30 averages as the number of averages for that range.
rev.22SEP89
FFTSegmnts 5-15
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